tft lcd analog clock quotation

The CLD series of 12-inch digital clocks have an LED analog display of seconds with a 4-digit LED display of hours and minutes. Display colors are available in red, green, blue, amber, or white. These clocks can reference NTP or time code and can be powered via AC or PoE.

Do you sell product machinery? Are you looking for a low cost machine to satisfy a client"s order? Perhaps you need one or more machines for your own industrial premises and want to see how much you can save when you buy direct. Whatever the reason that you"re searching for a wholesale analog clock with digital display, you will be surprised by how much you can save when you order directly form a Chinese wholesaler using Alibaba.com.

Machines that create paper, plastic or other shopping bags are essential for companies that supplies bags and packaging to other businesses. In fact some companies even choose to make their bags in-house, using a analog clock with digital display in order to cut down on their operating costs. Make sure staff who use machinery are fully trained and always check the manual before using a new analog clock with digital display. Remember, your new machine will last longer if you make sure it has regular cleaning and maintenance. As well as a analog clock with digital display, you can buy parts and accessories at wholesale prices too.

Here at Alibaba.com you will find a range of machinery, whether you are looking for a big brand analog clock with digital display or a small unit and whether you need to replenish your own stock or need a machine for your own activities. Whatever the capacity you need you"ll find the perfect analog clock with digital display, and you"ll also be able to take advantage of low-cost wholesale prices because you"ll be ordering direct from Chinese manufacturers.

There’s just something special about an analog clock. Perhaps it’s because it has a “face” instead of a “display.” Perhaps it’s the way that an analog clock shows the passage of time, while still giving us a hopeful glimpse at the hours coming up. Perhaps we notice that the cyclical nature of an analog clock mirrors the rotation of the earth. Morning is followed by evening is followed by morning. Just like noon is followed by midnight is followed by noon. And there’s comfort in that.

And yet, there’s an increasing number of young people who don’t know how to read an analog clock. Some UK schools recently opted to install digital clocks in exam rooms because teenagers couldn’t read the analog ones. Thankfully, many educators still see the value in teaching kids to read analog clocks. They cite fractions and counting by fives as reasons to keep analog clocks in the curriculum.1 And let’s not forget all the common phrases that rely upon an analog clock for context. Some of them make no sense at all if you don’t know how an analog clock works. Without analog clocks, how would you explain what direction “clockwise” is?

Many analog technologies have been rendered obsolete by their digital counterparts. But analog clocks are different. Digital clocks have been around for over 60 years. But we’re still happily making analog clocks.

Analog clocks double as art. And art makes us happy. Preliminary studies show that looking at art can enhance our well-being.2 You might have a hard time thinking of clocks as art. Perhaps you’re thinking of that clock in your 10th grade history class. The one you stared at as the seconds slowly ticked by.

But think of all the analog clocks you’ve seen. They each have their own characteristics. Some, like that school clock, are meant to be simple and functional. Others, like the glass window clockwe built for Jason Oppenheim’s home office, are meant to be looked upon and appreciated.

An analog clock is a map of your day. It tells you the current time, but it also gives context—where you are, where you’ve been, and where you’re going.

Do you ever find yourself saying “It’s 2:46. I’ll start that at 3:00,” only to glance at the digital clock on your computer at 3:02 and think, “well, I guess I’ll start at 3:15?” One way to beat this type of procrastination is to put an analog clock on your desk. When you read 2:46 on an analog clock, you see that you have almost a full quarter of an hour between 2:46 and 3:00.3 Taken in that context, it’s much more difficult to squander those 14 minutes.

An analog clock lets you see the time passing. If you’re shooting for a midday deadline. It’s harder to procrastinate when you can literally see your remaining time dwindling down. An analog clock also helps you to grasp how long something takes. That “pie chart” on the clock’s face helps you mentally break down a task into smaller, more manageable ones.4

An analog clock tells you at a glance how much time you have left.This is useful in an exam setting (provided the exam takers know how to read the clock), or with a deadline, as mentioned above. But it can also help you be on time for your next appointment.

An analog clock requires no such internal dialog. You can see in an instant how much time is left between now and when you need to be there. At the same time, you can see how much time is left between now and when you need to leave.

If an analog clock was visible from your seat, you could simply glance up and see how much time you had left. Your furtive glances at the clock on the wall behind you tell you exactly what you need to know. And your lunch companion just perceives it as a polite break in eye contact.5 They feel like the most important person in your day.

But digital clocks have some advantages too. When what time it is nowis the most important thing, a digital clock makes sense. If you need to know what time it is down to the second, you’ll probably want to go with a digital clock.

You might be tempted to jump to the conclusion that digital clocks are more accurate. But these days, analog clocks can be just as accurate as your digital clock. In fact, they might even be more accurate. Our custom analog clocks are powered by masterclock that automatically sets the time via GPS or ethernet. Other standard features include: automatic daylight savings time updates, power outage backup, and timed illumination.

Digital clocks do have their place. But for all of the reasons listed above, we recommend incorporating at least one analog clock into your daily routine.

Writing a code for an analoge clock may seem a bit of a daunting task. Especially the calculations for the positions of the hands, but it isn"t really that hard at all.

In this instructable I will talk a little bit about the theory and then we"ll move on to the actual code itself. This was just a project build on the breadboard, while building my wifi radio. It started life as the script for a grafical volume button and ended up as a clock that never made it in the final project but it might come in handy for one of you out there.

Instead of viewing a clock as a set of moving hands, we have to imagine it as a set of concentric circles. A hand is then a line drawn between the centre and a point on one of these circles.

If you would write a code with these equations you would get a clock that starts at 3 o clock and runs counterclockwise. That is because our angular calculations are in relation to the X-axis and those we need for the clock should be in relation to the Y-axis. Luckely with a bit of mathematical magic, this problem is solved very quickly:

What happened here is that we swapped the relation to the axis by swapping sin and cos and we changed the direction from counterclockwise to clockwise by changing + to -.

To drive the LCD I"ve used porta of the atmega16 for transferring the data and portc.2 to portc.7 for control. Don"t forget to add the 10K potentiometer for the contrast.

A thin-film-transistor liquid-crystal display (TFT LCD) is a variant of a liquid-crystal display that uses thin-film-transistor technologyactive matrix LCD, in contrast to passive matrix LCDs or simple, direct-driven (i.e. with segments directly connected to electronics outside the LCD) LCDs with a few segments.

In February 1957, John Wallmark of RCA filed a patent for a thin film MOSFET. Paul K. Weimer, also of RCA implemented Wallmark"s ideas and developed the thin-film transistor (TFT) in 1962, a type of MOSFET distinct from the standard bulk MOSFET. It was made with thin films of cadmium selenide and cadmium sulfide. The idea of a TFT-based liquid-crystal display (LCD) was conceived by Bernard Lechner of RCA Laboratories in 1968. In 1971, Lechner, F. J. Marlowe, E. O. Nester and J. Tults demonstrated a 2-by-18 matrix display driven by a hybrid circuit using the dynamic scattering mode of LCDs.T. Peter Brody, J. A. Asars and G. D. Dixon at Westinghouse Research Laboratories developed a CdSe (cadmium selenide) TFT, which they used to demonstrate the first CdSe thin-film-transistor liquid-crystal display (TFT LCD).active-matrix liquid-crystal display (AM LCD) using CdSe TFTs in 1974, and then Brody coined the term "active matrix" in 1975.high-resolution and high-quality electronic visual display devices use TFT-based active matrix displays.

The circuit layout process of a TFT-LCD is very similar to that of semiconductor products. However, rather than fabricating the transistors from silicon, that is formed into a crystalline silicon wafer, they are made from a thin film of amorphous silicon that is deposited on a glass panel. The silicon layer for TFT-LCDs is typically deposited using the PECVD process.

Polycrystalline silicon is sometimes used in displays requiring higher TFT performance. Examples include small high-resolution displays such as those found in projectors or viewfinders. Amorphous silicon-based TFTs are by far the most common, due to their lower production cost, whereas polycrystalline silicon TFTs are more costly and much more difficult to produce.

The twisted nematic display is one of the oldest and frequently cheapest kind of LCD display technologies available. TN displays benefit from fast pixel response times and less smearing than other LCD display technology, but suffer from poor color reproduction and limited viewing angles, especially in the vertical direction. Colors will shift, potentially to the point of completely inverting, when viewed at an angle that is not perpendicular to the display. Modern, high end consumer products have developed methods to overcome the technology"s shortcomings, such as RTC (Response Time Compensation / Overdrive) technologies. Modern TN displays can look significantly better than older TN displays from decades earlier, but overall TN has inferior viewing angles and poor color in comparison to other technology.

The transmittance of a pixel of an LCD panel typically does not change linearly with the applied voltage,sRGB standard for computer monitors requires a specific nonlinear dependence of the amount of emitted light as a function of the RGB value.

Less expensive PVA panels often use dithering and FRC, whereas super-PVA (S-PVA) panels all use at least 8 bits per color component and do not use color simulation methods.BRAVIA LCD TVs offer 10-bit and xvYCC color support, for example, the Bravia X4500 series. S-PVA also offers fast response times using modern RTC technologies.

TFT dual-transistor pixel or cell technology is a reflective-display technology for use in very-low-power-consumption applications such as electronic shelf labels (ESL), digital watches, or metering. DTP involves adding a secondary transistor gate in the single TFT cell to maintain the display of a pixel during a period of 1s without loss of image or without degrading the TFT transistors over time. By slowing the refresh rate of the standard frequency from 60 Hz to 1 Hz, DTP claims to increase the power efficiency by multiple orders of magnitude.

Due to the very high cost of building TFT factories, there are few major OEM panel vendors for large display panels. The glass panel suppliers are as follows:

External consumer display devices like a TFT LCD feature one or more analog VGA, DVI, HDMI, or DisplayPort interface, with many featuring a selection of these interfaces. Inside external display devices there is a controller board that will convert the video signal using color mapping and image scaling usually employing the discrete cosine transform (DCT) in order to convert any video source like CVBS, VGA, DVI, HDMI, etc. into digital RGB at the native resolution of the display panel. In a laptop the graphics chip will directly produce a signal suitable for connection to the built-in TFT display. A control mechanism for the backlight is usually included on the same controller board.

The low level interface of STN, DSTN, or TFT display panels use either single ended TTL 5 V signal for older displays or TTL 3.3 V for slightly newer displays that transmits the pixel clock, horizontal sync, vertical sync, digital red, digital green, digital blue in parallel. Some models (for example the AT070TN92) also feature input/display enable, horizontal scan direction and vertical scan direction signals.

New and large (>15") TFT displays often use LVDS signaling that transmits the same contents as the parallel interface (Hsync, Vsync, RGB) but will put control and RGB bits into a number of serial transmission lines synchronized to a clock whose rate is equal to the pixel rate. LVDS transmits seven bits per clock per data line, with six bits being data and one bit used to signal if the other six bits need to be inverted in order to maintain DC balance. Low-cost TFT displays often have three data lines and therefore only directly support 18 bits per pixel. Upscale displays have four or five data lines to support 24 bits per pixel (truecolor) or 30 bits per pixel respectively. Panel manufacturers are slowly replacing LVDS with Internal DisplayPort and Embedded DisplayPort, which allow sixfold reduction of the number of differential pairs.

With analogue signals like VGA, the display controller also needs to perform a high speed analog to digital conversion. With digital input signals like DVI or HDMI some simple reordering of the bits is needed before feeding it to the rescaler if the input resolution doesn"t match the display panel resolution.

Kawamoto, H. (2012). "The Inventors of TFT Active-Matrix LCD Receive the 2011 IEEE Nishizawa Medal". Journal of Display Technology. 8 (1): 3–4. Bibcode:2012JDisT...8....3K. doi:10.1109/JDT.2011.2177740. ISSN 1551-319X.

K. H. Lee; H. Y. Kim; K. H. Park; S. J. Jang; I. C. Park & J. Y. Lee (June 2006). "A Novel Outdoor Readability of Portable TFT-LCD with AFFS Technology". SID Symposium Digest of Technical Papers. AIP. 37 (1): 1079–82. doi:10.1889/1.2433159. S2CID 129569963.

PoE or network clocks permit an organization to use their existing Ethernet to achieve synchronized timing throughout their facilities. PoE clocks offer a number of advantages to the organization.

PoE stands for Power over Ethernet. The technology allows you to power devices such as clocks by using just a standard Category 6 Ethernet Patch Cable. Therefore, the clocks will receive not only their time from the Ethernet cable they will also receive their power from the cable.

Our wireless clocks do not need an Ethernet cable but do need a power source. This is the advantage of PoE Clocks where the power is provided by the Ethernet.

The ability to place an electric analog or digital clock without worrying about installing separate power is a cost savings. The clocks are just endpoints on your network. As end points they are maintenance free. They do not require any human intervention for the adjustment of daylight saving time or to replace batteries.

The software that is included with the network clocks can be installed on a networked window based PC. This window-based software will allow you to check the status of all the clocks on your network and to set the time zone for the clocks.

The function of setting the time zone is perfect for entities that want or need a world clock configuration to display different time zones. For example, the IT department of a Global company may need a visual display of time where their servers or offices throughout the world in order to accomplish the necessary work they must perform in operating a globally dispersed network.

The Digital clocks can also be mounted back to back to provide an excellent hallway clock. The mounting kit for the hallway clocks can be mounted on the wall or ceiling whatever is most appropriate for your facility.

The PoE analog clocks we offer come in sizes of 13 and 16 inches. Both sizes can be dual sided and function exceptionally well as hallway clocks. If you have a large hallway dual sided 16-inch clock may be appropriate.

Another thought of consideration with our PoE line is that you can easily mix and match analog and digital clocks, whatever, is most appropriate for your facility. We also have a full line of PoE message boards that can not only display urgent and operational messages but also time.

If you are considering PoE Led Digital clocks and also need a speaker sound system you can also use your Ethernet network to place speakers throughout your facilities.We offer both a Wifi and a IP speaker system.

Having a wall clock may seem redundant these days since everyone has phones, computers, and other tech that can display the time. However, wall clocks are still an important accessory in your office or business. Most people rely on wall clocks just as much as the ones on their devices, and they can also double as wall decorations. Wall clocks are also helpful for employees to set their times and for customers to easily see what time it is.

Analog or Digital –Whether it’s a matter of design or functionality, decide whether a digital clock or an analog clock is right for you. There are some models that have both!

Style/Decoration –If you’re planning to hang your clock in your storefront or where customers can see it, consider going for an interesting design. It will not only dress up your wall, but it may also be a great conversation starter.

Check out our picks below of the 20 best wall clocks we found on Amazon. We selected both digital and analog clocks, in various styles and designs. We hope our list will help you when you decide to shop for a wall clock for your business.

Top Pick:Our top pick is this large digital wall clock by Marathon. It features a slim design, easy to read 10-inch display, and shows the full calendar date and temperature as well as the time. The display can be set to English, Spanish, or French.

Runner Up:A close second is this stylish brushed metal clock by Seiko. It is battery-powered and silent, and its classic design will look great anywhere.

Get 2 analog wall clocks for one low price with this set from Bernhard. Both clocks are 10″ in diameter and use 1 AA battery. They are said to be easy to hang and match any environment.

This atomic wall clock by Sharp resets regularly by radio-control and adjusts automatically for daylight savings time. It is 12 inches in diameter and matches any style of room or office.

Braun’s classic wall clock features easy to read dial layout and contrasting hour and minute hands. It has a semi-tempered glass lens and requires one AA battery for operation.

This atomic digital clock features self-setting time and date, alarm options, and an easy-to-hang design. It automatically updates for seasonal time changes and can be used on the wall or free-standing.

A modern design on the face makes this wall clock functional and stylish. It has analog numbers around the face and a small digital display in the center that shows the date and temperature.

The 16.2-inch display on this clock has jumbo numbers and shows the date, day, and temperature. You can also set 2 separate alarms and it has a remote control.

The 3D numbers make this clock extra easy to read, and it looks great, too. Because the numbers are 3D, there is no cover on this clock. It’s available in 4 different styles and runs on batteries.

This uniquely designed analog clock has a contemporary design, with large hour digits and small minute digits. It is made of plastic with a glass lens, an aged white face, and oil rubbed bronze finish.

Mid-century modern is a very popular décor style, and this starburst clock is a great example of it. It is 21.6″ tall, silent, and will definitely have people asking where you got it.

TimeTools is an official reseller of the Inova OnTime range of analog and digital wall clocks and time displays. We can supply Inova’s full range of wall clocks to organisations world-wide.

The wall clocks provide an organisation-wide, accurate, display of time, ensuring that everyone is working to the same time. They simply plug onto a standard ethernet network with a RJ45 network jack, therefore, utilising potentially pre-existing network infrastructure.By utilising Simple Network Time Protocol (SNTP) over ethernet, each clock is synchronised to the same, accurate, time.

A great feature is that the clocks are completely maintenance free, adjusting automatically for daylight saving time. They can also be configured for any specific time zone and daylight-saving requirements.

The clocks utilise IEEE802.3af Power-over-Ethernet (PoE) technology, identical to IP-telephones. PoE provides a step forward in powering network-attached devices, by providing both power and data through an existing CAT-5 network cable.

The use of PoE adds flexibility and reduces installation costs by eliminating the need for a local mains outlet positioned near the location of the clock. Only a single CAT-5 network cable is required to run to the location of the clock which will provide both power and data requirements.

If your network is not currently PoE enabled, multi-port PoE network switches are available from any IT reseller at a very reasonable cost. Alternatively, TimeTools can provide low-cost single port PoE injectors for powering individual clocks.

By utilising 100mm (4 inch) seven-segment LED displays, the digital clocks provide an easily readable, concise and unambiguous, display of time. The time can be easily read at a viewing distance of up to 50m (150ft). The four-digit clocks display hours and minutes, while the six-digit models also display seconds. The second digits are provided with slightly smaller 75mm (3 inch”) LED’s to providing an easily distinguishable time and seconds display. The analog clock have hours, minutes and second hands on a 300mm (12″) clock face with a viewing distance of up to 30m (100ft).

The standard units have two key-hole cutouts in the rear panel of the clocks to easily and simply mount on to a wall or flat surface. An optional mounting kit is also available which allows the digital clocks to be mounted either singularly or back-back at right-angles off the wall or ceiling.

The four-digit clocks are available in Plastic, Aluminium and Stainless Steel enclosures. While the six-digit clocks are available in Aluminium and Stainless Steel only. There are a number of colour options: Black, Off-White and Putty.

There is also a NEMA / IP rated polycarbonate enclosure available for the four and six digit clocks which provides water-tight, dust-tight and corrosion-resistance. These are ideal for food processing plants, pharmaceuticals and any other environment where additional protection is required

By using SNTP over IP, the clocks can synchronise to a number of different time references. A local NTP time server can be used, which is generally accepted to be the ideal option. An internet time reference can be used, of which there are a number, which are completely free of charge, however, the network that the clocks are connected to needs to have access to the internet. Alternatively, a Microsoft Windows or LINUX/UNIX server can be used, however, the clocks will all show the same time, but only as accurate as the time on the referenced server. This last option is often preferred by time and attendance installers, so that the clocks utilise the same time as the clocking machines.

The clocks are only as accurate as the NTP server that they are referenced to. Typically, they will display time to within one-fifth of a second (0.2sec) of the reference or master clock.

Each clock can be configured individually by simply logging on to the unit from a PC on the network using a password-protected telnet session. A number of configuration commands are available, which can then be issued to set time zone, sntp server, 12 or 24 hour clock display and other options. Alternatively, a configuration string can be sent at power up via a DHCP server, so that a large number of clocks can be completely configured, simultaneously, from a single point.

The traditional mechanical instrument lacks the ability to satisfy the market with characters of favorable compatibility, easy upgrading, and fashion. Thus the design of a TFT-LCD (thin film transistor-liquid crystal display) based automobile instrument is carried out. With a 7-inch TFT-LCD and the 32-bit microcontroller MB91F599, the instrument could process various information generated by other electronic control units (ECUs) of a vehicle and display valuable driving parameters on the 7-inch TFT-LCD. The function of aided parking is also provided by the instrument. Basic principles to be obeyed in circuits designing under on-board environment are first pointed out. Then the paper analyzes the signals processed in the automobile

instrument and gives an introduction to the sampling circuits and interfaces related to these signals. Following this is the functional categorizing of the circuit modules, such as video buffer circuit, CAN bus interface circuit, and TFT-LCD drive circuit. Additionally, the external EEPROM stores information of the vehicle for history data query, and the external FLASH enables the display of high quality figures. On the whole, the accomplished automobile instrument meets the requirements of automobile instrument markets with its characters of low cost, favorable compatibility, friendly interfaces, and easy upgrading.

The digital instrument has functions of vehicle information displaying, chord alarming, rear video aided parking, LED indicating, step-motor based pointing, and data storage. The instrument adopts dedicated microcontroller MB91F599, a 7-inch LCD, and two step-motors to substitute for the traditional instrument. All the information generated by other ECUs can be acquired via not only the sample circuits but also the CAN bus.

The instrument provides interfaces for different types of signals and the CAN bus. All types of signals (such as square wave signal, switching signal, resistance signal, analog voltage signal, etc.) coming from other ECUs can be acquired either from different types of sampling circuits or from the CAN bus. This makes it suitable for both the outdated application where the information from other ECUs can only be acquired via the sampling circuits and the modern application where the information from other ECUs are transmitted via the CAN bus.

The CAN bus interface and the 7-inch TFT-LCD make it more convenient to upgrade the instrument without changing the hardware. If the software needs to be upgraded, we need not bother to take the instrument down and program the MCU. Instead, we can upgrade the instrument via the vehicle’s CAN network without taking the instrument down, which makes the upgrading more convenient. Most of the information from other ECUs can be transmitted via the CAN bus; so, we do not have to change the hardware circuits if some of the ECUs’ signals are changed in different applications. Besides, since most of the driving parameters are displayed on the TFT-LCD, and the graphical user interface can be designed with great flexibility by programming, only the software needs to be revised to meet different requirements of what kind of driving parameters to display and so forth. These characters, together with the reserved interfaces, enhance the instrument’s compatibility in different applications.

On the one hand, there are some automobile instruments which adopt 8-bit MCUs or 16-bit MCUs which have limited peripherals, so it is difficult for them to meet some requirements such as rearview video and high real-time data processing performance. And many extra components are needed if the designer wants to accomplish some functions such as video input. On the other hand, there are some advanced automobile instruments which adopt high performance MCUs (such as i.MX 53, MPC5121e, and MPC5123) and run Linux on them. They even use larger TFT-LCDs (such as the 12.3-inch TFT-LCD with a resolution of 1280 × 480 pixels) to display driving parameters. These automobile instruments show higher performances than the instrument in this paper. However, they are more expensive than this automobile. This instrument is able to provide almost all the functions of the advanced automobile instrument with a lower cost.

The instrument receives signals from other ECUs via the sampling circuits or the CAN bus interface. It can also receive commands from the driver via the button interface. The signals are then processed by the MCU, after which the MCU may send the vehicle information to the LCD or light the LEDs and so forth, according to the results. Therefore, the automobile instrument can be viewed as a carrier of the information flow. And the design of the system can be viewed from two aspects: the hardware system and the information flow based on it.

The analog voltage signal reflects the battery voltage and the air pressure. The corresponding circuit adopts the resistive subdivision so as to adjust the ratio of the resistors for putting voltage of the signal below the microcontroller’s maximum I/O voltage. The value of the resistors should be a little larger to lower down the static power consumption of the resistors. It is unnecessary to go into detail of the circuit.

Since the FLASH size of the microcontroller is only 1 MB which is limited for the storage of pictures displayed on the LCD, external FLASH is needed to store different kinds of meaningful pictures such as the background of the dial. Two S29GL256N chips with a memory capacity of 256 Mb are chosen for picture data storage for their high performance and low power consumption. The application circuits of the chips are provided in their datasheets, so it is unnecessary to go into the details of them here.

The 7-inch TFT-LCD has a resolution of pixels and supports the 24-bit for three RGB colors. The interface of the 60-pin TFT-LCD can be categorized into data interface, control interface, bias voltage interface, and gamma correction interface.

The data interface supports the parallel data transmitting of 18-bit (6 bits per channel) for three RGB colors. Thus, a range of colors can be generated. The control interface consists of a “horizontal synchronization” which indicates the start of every scan line, a “vertical synchronization” which indicates the start of a new field, and a “pixel clock.” This part is controlled by the graphics display controller which is integrated in the MB91F599. We just need to connect the pins of the LCD to those of the microcontroller correspondingly.

Bias voltages are used to drive the liquid crystal molecules in an alternating form. The compact LCD bias IC TPS65150 provides all bias voltages required by the 7-inch TFT-LCD. The detailed circuit is also provided in the datasheet of TPS65150.

The greatest effect of gamma on the representations of colors is a change in overall brightness. Almost every LCD monitor has an intensity to voltage response curve which is not a linear function. So if the LCD receives a message that a certain pixel should have certain intensity, it will actually display a pixel which has intensity not equal to the certain one. Then the brightness of the picture will be affected. Therefore, gamma correction is needed. Several approaches to gamma correction are discussed in [20–22]. For this specific 7-inch LCD, only the producer knows the relationship between the voltage sent to the LCD and the intensity it produces. The signal can be corrected according to the datasheet of the LCD before it gets to the monitor. According to the datasheet, ten gamma correction voltages are needed. These voltages can be got from a resistive subdivision circuit.

For this instrument, the LED indicators, the backlight, and the chord alarm need to be supplied with a voltage of +12 V; the CAN transceiver, the EEPROM, and the buttons need to be supplied with a voltage of +5 V; the video buffer circuit, the external FLASH, and the data interface of the LCD need to be supplied with a voltage of +3.3 V. Besides, the microcontroller needs to be supplied with voltages of +5 V and +3.3 V simultaneously. Figure 8 offers a detailed block diagram of the power supply for the automobile instrument.

The main task for the program is to calculate the driving parameters of the vehicle and display them on the TFT-LCD. The calculation is triggered by the input signals via the sampling circuits or the CAN bus. The main program flow chart of the system is shown in Figure 10.

The design scheme of a TFT-LCD based automobile instrument is carried out form aspects of both the hardware and the main program flow chart. The MB91F599 simplifies the peripheral circuits with its rich on-chip resources and shows high performance in real-time data processing. The automobile instrument is capable of displaying the velocity of the vehicle, the engine speed, the cooling water temperature, the oil pressure, the fuel volume, the air pressure, and other information on the TFT-LCD, which contributes a lot to driving safety and satisfies drivers’ aesthetics. Besides, the rearview video makes the parking and backing easier and safer for the driver. Moreover, the CAN bus interface and TFT-LCD make it easier for the upgrading of the instrument without changing the hardware, thus saving the cost.