Source Driving Circuit With Gamma Compensation for LCD Crosstalk
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional LCDs face significant crosstalk issues due to common voltage noise, which conventional feedback circuits struggle to effectively mitigate, leading to color inaccuracy and inefficiencies in pixel driving.
Innovation Solution
A source driving circuit is designed with a reference voltage generating circuit, compensation circuits, and a digital to analog converter, which generates compensated gamma reference voltages and data driving voltages to reduce crosstalk by incorporating a portion of the common voltage noise, thereby stabilizing pixel driving voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional feedback common voltage circuit is used to dynamically adjust common voltage for compensation, then common voltage distortion can be compensated, but the heavy load of the common electrode causes crosstalk to persist
Solution Approach 1:
The patent extracts the common voltage noise component from the gamma reference voltage generation process by using compensation circuits that subtract the common voltage variation from the gamma reference voltage, thereby eliminating the source of crosstalk rather than merely compensating for its effects
Solution Approach 2:
The compensation circuits perform preliminary compensation on the gamma reference voltage before it is used to drive the pixels, by pre-subtracting the common voltage variation component, so that the crosstalk is prevented from occurring in the first place rather than being corrected afterward
2Measurement precision
If common voltage is dynamically adjusted using feedback circuit, then color accuracy can be improved, but the complexity of the circuit increases
Solution Approach 1:
The patent introduces compensation circuits as intermediary components between the common voltage source and the gamma reference voltage generation, which mediate the interaction by filtering out the noise component and providing a clean gamma reference voltage without requiring complex feedback control mechanisms
3Power
If heavy load is applied to common electrode for voltage adjustment, then voltage compensation can be achieved, but crosstalk cannot be effectively solved
Solution Approach 1:
The patent converts the harmful common voltage noise into a useful compensation signal by measuring the common voltage variation and using it to adjust the gamma reference voltage in the opposite direction, thereby transforming the source of crosstalk into the means for eliminating it
Data Source
AI summary
A source driving circuit, a display apparatus and an operation method are provided. The source driving circuit includes a reference voltage generating circuit, a plurality of compensation circuits, a gamma voltage generating circuit and a digital to analog converter. The reference voltage generating circuit is configured to generate a plurality of gamma reference voltages. The plurality of compensation circuits are coupled to the reference voltage generating circuit and configured to generate a plurality of compensated gamma reference voltages according to the plurality of gamma reference voltages and a voltage associated with a common voltage. The gamma voltage generating circuit is configured to generate a plurality of gamma voltages according to the plurality of compensated gamma reference voltages. The digital to analog converter is configured to generate a plurality of data driving voltages corresponding to image data according to the plurality of gamma voltages.