Common Voltage Compensation Circuit for LCD Signal Delay
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Solution Overview
Problem
Large screen LCD displays experience signal delay and quality deterioration due to variations in common voltage, leading to distortion and afterimages, particularly as screen size increases and common voltage line width narrows.
Innovation Solution
The implementation of a display device and method that reduces signal delay by arranging common voltage lines in both horizontal and vertical directions, using a common voltage compensation circuit with operational amplifiers and feedback lines to maintain consistent voltage, and forming vertical common voltage lines on gate or source/drain layers to enhance transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the screen size is increased and common voltage line width is narrowed for high transmittance, then display resolution and transmittance are improved, but signal delay and voltage distortion increase
Solution Approach 1:
The patent divides the common voltage line into multiple segments by introducing vertical common voltage lines that intersect with horizontal common voltage lines. This segmentation reduces the effective length of each voltage transmission path, thereby reducing signal delay while maintaining narrow line widths for high transmittance
Solution Approach 2:
The patent transitions from a single-dimensional horizontal common voltage line to a two-dimensional grid structure by adding vertical common voltage lines. This dimensional change creates multiple parallel transmission paths, reducing the overall signal delay across the large display panel
2Device complexity
If common voltage lines are arranged in a single direction, then the structure is simple, but voltage deviation and distortion occur across the display panel
Solution Approach 1:
The patent adds vertical common voltage lines in the second dimension to complement the horizontal common voltage lines. This creates a grid structure that distributes voltage more uniformly across the display panel, eliminating voltage deviation and distortion while maintaining reasonable structural complexity
3Productivity
If vertical common voltage lines are formed on gate or source/drain layers, then transfer efficiency is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent utilizes existing gate or source/drain layers, which are already part of the TFT structure, to form vertical common voltage lines. This multi-functional use of existing layers enhances voltage transfer efficiency without requiring entirely new manufacturing processes, thereby limiting the increase in manufacturing complexity
Data Source
AI summary
A display panel includes left and right common voltage lines in opposite side edges, horizontal common voltage lines connecting the left and right common voltage lines, and vertical common voltage lines, a printed circuit board including one or more integrated circuits, and a common voltage compensation circuit supplies a common voltage to the left and right common voltage lines while supplying the common voltage through the integrated circuits to the vertical common voltage lines.