LCD Driving Circuit Gamma Voltage Equalization
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Solution Overview
Problem
Liquid crystal displays (LCDs) face uneven image display due to variations and voltage drops in Gamma voltages during transmission to liquid crystal driving chips, resulting from different distances between the chips and the Gamma voltage generating module.
Innovation Solution
A driving circuit with liquid crystal driving chips and a time sequence control chip that adjusts Gamma voltages using differential P2P wires for dual-direction communication, generating correcting parameters to equalize voltages across chips, ensuring uniform display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Gamma voltage generating module transmits Gamma voltages to liquid crystal driving chips, then liquid crystal panel can be driven to display, but voltage drops and variations occur during transmission causing uneven display images
Solution Approach 1:
The patent implements a feedback mechanism where the time sequence control chip receives original Gamma voltages from multiple liquid crystal driving chips, compares them to detect voltage variations, generates correcting parameters, and feeds them back to the driving chips. This closed-loop feedback system continuously monitors and corrects voltage drops, ensuring uniform display across the panel despite transmission losses.
Solution Approach 2:
The patent dynamically adjusts Gamma voltage parameters by generating correcting parameters based on detected voltage variations. The time sequence control chip modifies the original Gamma voltages by applying correction values to each liquid crystal driving chip, thereby compensating for voltage drops and maintaining consistent display quality across different transmission distances.
2Area of stationary object
If multiple liquid crystal driving chips are arranged in one-dimensional array to cover larger display area, then display coverage increases, but transmission distance variations cause unequal Gamma voltages
Solution Approach 1:
The patent applies local quality by providing individualized correction to each liquid crystal driving chip based on its specific position and transmission characteristics. The time sequence control chip generates distinct correcting parameters for each chip in the one-dimensional array, allowing each chip to receive appropriately adjusted Gamma voltages tailored to its local transmission conditions, thereby achieving uniform display across the entire large-area panel.
Solution Approach 2:
The patent segments the Gamma voltage control by dividing the display into multiple independent zones corresponding to each liquid crystal driving chip in the one-dimensional array. Each segment (chip) receives individually corrected Gamma voltages, allowing precise control of voltage distribution across different segments to compensate for position-dependent transmission variations.
3Reliability
If P2P wires with differential pair are used for communication, then signal transmission reliability improves, but circuit complexity increases
Solution Approach 1:
The patent introduces the time sequence control chip as an intermediary device that mediates between the Gamma voltage generating module and the liquid crystal driving chips. This intermediary collects voltage information from all chips, processes the data, generates correcting parameters, and distributes them back to the chips, thereby simplifying the overall system architecture while maintaining high transmission reliability through differential P2P wiring.
Data Source
AI summary
The present disclosure provides a driving circuit and a liquid crystal display device. The driving circuit is configured to drive the liquid crystal to display and includes liquid crystal driving chips configured to receive original Gamma voltage; a time sequence control chip configured to receive the original Gamma voltages transmitted by the liquid crystal driving chips and output Gamma voltage adjust correcting parameters to the liquid crystal driving chips; the liquid crystal driving chip compensating and correcting the original Gamma voltage according to the Gamma voltage adjust correcting parameters to make Gamma voltages of each of the liquid crystal driving chips equal.