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Video signal generating system and video signal generating method

A technology of video signal and generation method, applied in pulse modulation TV signal transmission, TV, image communication and other directions, can solve problems such as quality degradation and damage to high-frequency components of video signals used for testing

Active Publication Date: 2011-07-06
CHROMA ATE
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Problems solved by technology

However, this method will also damage the high-frequency components of the test video signal itself, resulting in a decrease in its quality, so it is not an ideal solution

Method used

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  • Video signal generating system and video signal generating method
  • Video signal generating system and video signal generating method

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Embodiment Construction

[0026] see Figure 3A , Figure 3A It is a block diagram of a video signal generation system in a specific embodiment of the present invention. In practice, the system can be a testing device, but not limited thereto. Such as Figure 3A As shown, video signal generation system 30 includes a digital-to-analog converter 32 and a differential amplifier 34 .

[0027] The digital / analog converter 32 is used for receiving a digital input signal, and generating a positive analog signal V(+) and a negative analog signal V(−) according to the digital input signal. When the digital input signal has a minimum input level (I MIN ), the voltage values ​​of the positive analog signal V(+) and the negative analog signal V(-) are approximately the same. The differential amplifier 34 is used to receive the positive analog signal V(+) and the negative analog signal V(-), and integrate the positive analog signal V(+) and the negative analog signal V(-) into a video signal V OUT . Next, th...

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Abstract

The invention provides a video signal generating system and a video signal generating method, wherein the video signal generating system comprises a digital / analog converter and a differential amplifier. The digital / analog converter is used for generating a positive analog signal and a negative analog signal according to a digital input signal. When the digital input signal has a minimum input level, the positive analog signal and the negative analog signal are roughly the same. The differential amplifier is used for integrating the positive analog signal and the negative analog signal into avideo signal that is transmitted to a display system. Besides effectively promoting the signal to noise ratio of the video signal, the video signal generating system and the video signal generating method can omit a clamping circuit in the existing circuit framework. Therefore, the hardware cost of the video signal generating system is reduced.

Description

technical field [0001] The present invention relates to a test device, and in particular to a signal generating system and a signal generating method of a test device designed for a display device. Background technique [0002] In recent years, due to the maturation of related manufacturing technologies and the reduction of manufacturing costs, display devices of various sizes are becoming more and more popular in both commercial and domestic applications. For manufacturers of display devices, how to improve the quality of display devices to gain favor from consumers is an issue worthy of great attention. [0003] Generally speaking, display equipment must go through a quality inspection program before it is sold out of the factory to ensure that its internal and external characteristics meet predetermined specifications. For example, during the test process, test patterns with certain specific colors or lines will be input into the display device; the actual result screen ...

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Application Information

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IPC IPC(8): H04N17/04H04N7/24
Inventor 徐建明陈普中
Owner CHROMA ATE
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