control board for lcd screen free sample

Shenzhen HZY Photoelectric Technology is a company which specialized in LCD/LCD Modules and backlight kits.As a professional manufacturer,HZY designs and produces high-quality LCD and LCM. We produce TN,HTN,BTN(VA),STN,FSTN LCD and COB,COG LCM.In addition to standard LCD,we can design and produce various kinds of custom LCD and LCM for customer as well.

All products are 100% tesed before shipment .We will do reliability tests,including high & low terperature tests,heat impact test and vibration test as per customer"s special requirements.

A controller board is a piece in an electrical circuit that interfaces with a peripheral object by connecting the computer to it. The connection may be with other computer parts, such as the memory controller, or with an external device, like a mouse, that acts as a peripheral controller for an operation of the original device.

The LCD controller board is often called the Analog/Digital (A/D) board. As a type of hardware processor, it allows for various video source inputs to be connected, selected, and displayed on the LCD screen. It does this by converting the different video input signals into a format manageable by the LCD panel.

In conjunction with the LCD controller, the LCD driver is a form of software that is the interface of and dependent on the controller piece. Combined, the two form an LCD controller driver board. As the controller connects the computer to the operating system (OS), the driver facilitates that communication. Though there is typically just one display controller per LCD, there can be added drivers to extend the reach of the drive to further segments of the LCD.

To generalize the process, the LCD controller/driver adjusts the input signal, scaling resolution if needed, and then outputs the signal for the LCD monitor to use. Some of these output interfaces are low-voltage differential signaling (LVDS), SPI, I2C, and Parallel.

In most LCD controller/driver boards, there are two other input/output systems. Both these systems, however, are two-way pathways. One involves controlling and monitoring options, such as controls for brightness, image, and color using the on-screen display (OSD) control panel. The other is for communication via connections like Ethernet, Bluetooth, or IP.

With modern developments, touch screen devices have become much more prominent, and so the touchscreen controller has as well. There are two types of touchscreens: the resistive one that measures pressure and the capacitive one that reads touch. In both of these, there are sensors that detect the touch signal which then transmit the signal data to the controller. The controller then processes the command for the OS.

To delve deeper into the details, consider the previously mentioned input signals. There are a variety of signals that LCD technology processes, such as VGA, HDMI, DVI, and DisplayPort. These computer display standards vary in format and characteristics like aspect ratio, display size, display resolution, color depth, and refresh rate. One of the biggest differences between these standards is their usage of analog signals or digital signals.

In an analog signal, the signal is continuous, but in digital, they are discrete values, typically of 0 and 1. Digital signals have become the most used, as they can more easily carry information and have better quality maintenance; if the analog signal is used and unnecessary information is present, it is impossible to remove it due to the continuous nature of the analog signal. In order to make that switch to digital signals, converters are used to replacethe real numbers of the analog sequence with a set of discrete values.

The VGA, short for video graphic array, standard is one of the most popular analog-based technologies. In recent years, however, the VGA interface has been overshadowed by interfaces like high definition multimedia interfaces, better known as HDMI, which has become a de facto standard for digital signal transmissions.

The HDMI is a combination of digital audio and digital video transmission. There are many HDMI connectors, such as the standard, dual-link, and micro. These connectors are what the input signal travels through to reach the LCD controller and to direct what to display.

The DVI (Digital Visual Interface) offers both analog signals, digital signals, or a combination of the two. Like the HDMI, it has various connector types for different signal types.

And last from the list of examples of input signals is the DisplayPort. It is similar to HDMI in its purpose to replace outdated VGA and DVI as well as its transmission of audio and video through its interface. The DisplayPort does not have as much variation in cables and connectors as the HDMI, with only one cable and two types of connectors. From the DisplayPort, there is a growing technology called the embedded DisplayPort interface, or eDP interface. LCD manufacturers have begun to gravitate towards this interface due to its fewer connections, smaller size, and ability to quickly transmit high quality displays.

Bringing the subject back to LCD controllers, with the various types of computer display standards, the video signal inputs can be a challenge to accommodate and translate for the LCD panel, but with the help of adapters and the growth of these standard types, displays continue to become faster and develop with greater resolutions.

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To support (2) standard input channels, multiple input types per channel, and multiple windows in an embedded application, the VP13 offers a comprehensive approach for automatic detection, conversion, and windowing of many video formats.  Each input channel can have multiple, prioritized video input modes associated with it.  A mode consists of the input type (DVI, VGA. CVBS, etc), video timing, and associated window parameters.

Each input channel has a mode selection subsystem to scan for defined modes per a user-defined methodology. The VP13 can scan defined modes associated with a specific input type (such as VGA), all input types on that channel, or a specific mode identifier.  At power up, each channel’s mode selection subsystem initiates an automated scan. Once a mode is matched (either exactly or within pre-defined limits), that video input is displayed in its window(s) per the mode’s associated window parameters (input area-of-interest, window size, window location).

We have created a new webpage related to the very extensive LCD controller command set available for Digital View controllers, you can see a preview of the webpage here: www.digitalview.com/commands

Room controllers: To work with room controllers such as from Crestron, Extron, AMX and others. These can be readily programmed to control Digital View LCD controller enabled displays, typically this will be for on/off and brightness but may extend to other functions in more complex installations.

Hotkey functions, for example some users have display systems with multiple video sources and want to switch between them easily, integrators make small button boards that send a command string to trigger switching inputs. Other companies want to invoke certain settings, sometimes multiple settings such as changing the color and brightness setting with a single button push.

Computer application control: Customers can develop their own applications or integrate control into applications for management of display functions. One interesting example is to provide on-screen display controls to be used with touch screen monitors. A readily accessible example of how to do this is with the Digital View Controller Utility, a free Windows compatible application giving access to the commands supported by a particular LCD controller model.

Media player control & data: Especially in digital signage applications being able to control and monitor the display is becoming increasing important. The Digital View provides both as some commands make changes while others are for polling the system and retrieving data.

An LCD controller board is used to convert various types of video signal to a format for an LCD panel. The following graphic summarizes what a Digital View LCD controller board does, these are designed for commercial, ie non-consumer products…

Accepts a video signal input, for example, HDMI, DisplayPort, DVI, ARGB (VGA), Component video, Composite video, HD-SDI, HD-BaseT. The source may be a PC, camera, media player or other equipment generating video signals.

With the addition of control functions and monitoring options. This includes everything from brightness control, image and color controls as well as more advanced functions like picture-in-picture, also methods of control such as buttons and RS-232. There may also be sensors and other functions adding to the functionality of the display system.

The kinds of applications include anywhere a display is used, as computer monitors, in-flight entertainment systems, navigation systems, for medical applications of all types from diagnostics to surgery, on industrial equipment, in public digital signage.

Digital View currently offers approximately 30 models of LCD controller board including versions for harsher environments, and all of them are available for some level of customization.

Users of LCD controller boards are going to be manufacturers of display devices, for example various types of LCD monitor from small to large. So this might include the display on the counter of a shop, the digital sign out the shop, the seat-back screen on a plane or the monitor on a medical device. It is a very long list.

Designed and manufactured for very high reliability, the expectations of the working environment are typically higher for commercial applications, for example: Aviation, marine, medical, industrial, security, digital signage.

Designed with functions for specific applications. As an example, one Digital View LCD controller board model has the capability to support two backlight rails as well as high-resolution backlight adjustment. This enables very low light adjustment. Another supports a user-definable gamma curve enabling specific source equipment calibration. The list goes on.

Suitable for harsh environments. For example, many Digital View models have what is called a conformal coating, this protects the circuitry, in addition, the components selected have much wider operating temperature tolerances.

Customization. Consumer products are usually designed then mass-produced. A commercial product may need to be customized so as to make it suitable for a specific application.

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