Circuit for generating horizontal synchronization signal in display device and related method
A horizontal synchronization signal and horizontal synchronization technology, applied to static indicators, cathode ray tube indicators, instruments, etc., can solve the problems of consuming chip area and power consumption
Active Publication Date: 2018-05-08
REALTEK SEMICON CORP
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Problems solved by technology
In the prior art, the luminance signal Y is converted into a digital signal through an analog-to-digital conversion circuit, and then the maximum voltage value Vmax and the minimum voltage value Vmin of the horizontal synchronization pulse are obtained, and then the reference voltage Vref used by the comparator is determined. , however, this method will consume a lot of chip area and power consumption
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[0025] Certain terms are used throughout the description and claims to refer to particular components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This description and the following claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. The "comprising" mentioned throughout the specification and the following claims is an open term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" here includes any direct and indirect electrical connection means. Therefore, if it is described in the text that a first device is coupled to a second device, it means that the first device can be directly electrically connected to the second device. second device, or indirectly electrically connected to the second device through other devices or connection means.
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The invention discloses a circuit and method for generating a horizontal synchronous signal in a display device. The circuit includes: a first comparator for comparing a brightness signal from a color difference terminal of the display device with the A first reference signal, to generate a compared signal; a control circuit, used to generate a first digital control signal according to the compared signal; a first digital-to-analog converter, used to control the signal according to the first digital signal to generate the first reference signal; a second digital-to-analog converter is used to generate a second reference signal according to a second digital control signal generated by the control circuit, wherein the second digital control signal is based on the first determined by a digital control signal; and a second comparator for comparing the luminance signal with the second reference signal to generate the horizontal synchronization signal. The invention has lower chip area and power consumption and faster speed.
Description
technical field [0001] The present invention relates to a display device, in particular to a circuit for generating a horizontal synchronization signal in the display device and a related method. Background technique [0002] In a general display device, when the received image is transmitted by the component video connector (ie, Y / Pb / Pr interface), it is necessary to generate a horizontal synchronous signal (horizontal synchronous) from the brightness signal (Y). signal) for subsequent use. [0003] Please refer to figure 1 , figure 1 Shown is a schematic diagram of the luminance signal Y and the horizontal synchronization signal Hsync to be generated. Such as figure 1 As shown, the luminance signal Y mainly includes the horizontal sync pulse, the front porch interval, the back porch interval and the display data (active video data) of the nth line on the screen. Generally speaking, the display will A comparator is used to determine whether the brightness signal Y is l...
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IPC IPC(8): G09G5/02G09G5/10
Inventor 闵绍恩
Owner REALTEK SEMICON CORP