Gamma Reference Voltage Generator for LCD Sub-Pixel Control
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Solution Overview
Problem
Current liquid crystal display devices cannot independently correct the brightness of sub-pixel units for different colors and adjust the white point coordinates in grayscale, limiting display quality.
Innovation Solution
A gamma reference voltage generator with a timing control module, programmable gamma chip, and multiplexing module that produces multiple groups of gamma reference voltages, allowing for independent control of sub-pixel units and adjustment of white point coordinates using time-division multiplexing, without increasing the number of gamma chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single gamma chip is used to produce gamma reference voltage for all sub-pixel units, then the circuit structure remains simple, but the brightness of sub-pixel units of different colors cannot be corrected independently and white point coordinates cannot be adjusted
Solution Approach 1:
The patent segments the gamma reference voltage generation by creating multiple groups of gamma reference voltages (first group for red sub-pixel units, second group for green sub-pixel units, third group for blue sub-pixel units) that can be independently controlled. This segmentation allows independent brightness correction for each color while maintaining a single gamma chip architecture, resolving the contradiction between adaptability and device complexity.
2Adaptability or versatility
If multiple gamma chips are used to produce separate gamma reference voltages for different sub-pixel units, then independent brightness correction and white point adjustment become possible, but the circuit structure becomes more complex and costs increase
Solution Approach 1:
The patent merges the functionality of multiple gamma chips into a single gamma chip by implementing multiple groups of gamma reference voltage generation within one chip. The single gamma chip produces multiple groups of gamma reference voltages that are then distributed to different sub-pixel units through a multiplexing module, achieving independent gamma control without the complexity and cost of multiple separate gamma chips.
Solution Approach 2:
The single gamma chip is designed to perform multiple functions by generating multiple groups of gamma reference voltages simultaneously. This multi-functional gamma chip can serve red, green, and blue sub-pixel units independently, replacing what would traditionally require three separate gamma chips, thus reducing device complexity while maintaining full adaptability.
3Ease of manufacture
If a single group of gamma reference voltages is used for all sub-pixel units, then the gamma chip design is simplified, but color expression and display quality are limited
Solution Approach 1:
The patent implements dynamic control of gamma reference voltages by allowing different groups of gamma reference voltages to be selectively applied to different sub-pixel units based on timing control signals. This dynamic approach enables precise control over color expression and display quality while keeping the gamma chip design relatively simple, as the same chip structure can serve multiple purposes through temporal multiplexing.
Data Source
AI summary
Disclosed are a gamma reference voltage generator, a method for generating a gamma reference voltage and a liquid crystal display device comprising the gamma reference voltage generator. The gamma reference voltage generator includes a timing control module; a programmable gamma chip, which is electrically connected to the timing control module; and a multiplexing module, which is electrically connected to the timing control module and the programmable gamma chip. Independent control of gamma reference voltages of sub-pixel units of the liquid crystal display device can be achieved, by means of which display quality of images can be improved.