Full In-Cell Display Voltage Offset Compensation
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Solution Overview
Problem
Full in-cell touch display technologies face challenges in achieving uniform image display due to voltage inequalities between pixel and common electrodes, leading to non-uniform image presentation without increasing complexity or cost.
Innovation Solution
A method and display device that compensates image signals by calculating and applying voltage offsets to common electrodes based on grayscale differences, ensuring equal voltage differences between pixel and common electrodes, thereby improving image uniformity without altering the existing structure or adding transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If full in-cell touch technology integrates touch electrodes into common electrodes of array substrate, then structure is simplified and manufacturing cost is reduced, but voltage applied on liquid crystal pixels becomes non-uniform resulting in non-uniform displayed image
Solution Approach 1:
The patent applies local quality by determining different voltage compensation values for different regions of the array substrate. The compensation circuit divides the display area into multiple regions and applies region-specific compensation voltages to counteract the non-uniformity caused by varying wire lengths. This allows the simplified full in-cell structure to maintain uniform image display through localized adjustments.
Solution Approach 2:
The patent changes the voltage parameter dynamically through compensation. By calculating and applying compensation voltages based on measured grayscale differences in different regions, the system adjusts the voltage applied to common electrodes to compensate for the non-uniformity. This parameter change approach resolves the contradiction by maintaining uniformity through active voltage adjustment rather than structural modification.
2Manufacturing precision
If driving electrodes and neighboring common electrodes are connected through switching transistors to ensure equal liquid crystal pixel voltages, then image uniformity is improved, but array substrate manufacturing process becomes more complex and transistor cost increases
Solution Approach 1:
The patent introduces a compensation circuit as an intermediary component that mediates between the image signal source and the common electrodes. This compensation circuit calculates and applies voltage offsets to counteract the non-uniformity without requiring additional switching transistors in the array substrate. The intermediary approach achieves uniformity while avoiding the complexity of transistor-based solutions.
Solution Approach 2:
The patent replaces the mechanical/electrical approach of using physical switching transistors with a signal processing approach. Instead of physically connecting electrodes through transistors to equalize voltages, the system uses software-based compensation algorithms to calculate and apply appropriate voltage offsets. This substitution eliminates the need for additional transistors while achieving the same uniformity goal.
Data Source
AI summary
A method and a display device for uniform image display are provided. The method is used for a full in-cell display device and includes steps of: a display device inputting a first image signal, compensating the first image signal according to image compensation data to obtain a third image signal and displaying the third image signal. The display device includes a color filter substrate, an array substrate and a liquid crystal layer disposed therebetween. A side of the array substrate facing toward the liquid crystal layer is disposed touch electrodes. The touch electrodes are combined with common electrodes of the array substrate and arranged on the array substrate in a matrix. The compensation data are common electrode voltage offsets determined according to differences between grayscale information of the first image signal and an original second image signal. Accordingly, the invention can effectively improve the displayed image uniformity.