LCD Driving Circuit Compensation for Voltage Drop
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Solution Overview
Problem
In liquid crystal display (LCD) panels, the resistance in internal cabling causes a significant voltage difference between gate driver chips, leading to a noticeable color difference in the upper and lower halves of the display, affecting display quality.
Innovation Solution
A driving circuit with a compensation unit that outputs different driving voltages to gate driver chips based on their distance from the source, using a switching module and voltage dividing circuits to maintain consistent voltages across the panel, reducing color differences by adjusting voltage levels through the cabling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single control voltage is used for all gate driver chips, then the circuit is simple, but voltage difference is generated in the cabling leading to color difference
Solution Approach 1:
The patent applies local quality by providing different control voltages to different gate driver chips based on their specific positions and cabling lengths. The compensation unit generates multiple voltage levels (first control voltage, second control voltage, third control voltage) corresponding to different gate driver chip locations, ensuring each region receives the appropriate voltage to compensate for cabling resistance variations and achieve uniform display quality across the panel.
2Manufacturing precision
If different control voltages are provided to different gate driver chips, then color difference is reduced, but the circuit becomes more complex
Solution Approach 1:
The patent introduces a compensation unit as an intermediary component between the control board and the gate driver chips. This compensation unit generates and distributes different control voltages to various gate driver chips based on their positions, acting as a mediator that resolves the voltage difference problem caused by cabling resistance without requiring complex direct control connections for each chip.
Solution Approach 2:
The compensation unit performs preliminary action by pre-calculating and generating the appropriate control voltages before they are transmitted to the gate driver chips. The control voltage compensation is performed in advance based on the known positions and cabling characteristics, so that when the voltages are delivered to the respective gate driver chips, the voltage differences are already compensated, eliminating the need for complex real-time adjustments.
3Ease of manufacture
If cabling is arranged in the inner part of the LCD panel, then cost is reduced, but voltage loss occurs leading to color difference
Solution Approach 1:
The patent applies parameter changes by adjusting the control voltage parameters according to the position of each gate driver chip and the corresponding cabling length. The compensation unit generates different voltage levels (first control voltage, second control voltage, third control voltage) as parameters to compensate for the voltage loss in the inner cabling arrangements, thereby maintaining display uniformity while keeping the simple WOA cabling structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces color differences across the LCD panel by ensuring consistent voltage delivery to all gate driver chips, improving display quality by compensating for voltage losses in the internal cabling.
Implementation Method 1
an output end of the switching module is correspondingly connected with N groups of voltage dividing circuits. Output ends of N groups of voltage dividing circuits are connected to an inner cabling of the LCD panel and coupled to the gate driver chips through the inner cabling
Data Source
AI summary
The present disclosure discloses a driving circuit of a liquid crystal display (LCD) panel, an LCD panel, and an LCD device. The driving circuit of the LCD panel includes a compensation unit coupled with a scan line of the LCD panel and outputting N different driving voltages to different gate driver chips on a side of the panel. N is equal to a number of the gate driver chips arranged on the side of the LCD panel, as distance from the driving source of the driving voltages to the gate driver chip increases, absolute value of the driving voltage outputted by the compensation unit increases.