Display Substrate Load Compensation for Brightness Uniformity
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Solution Overview
Problem
Display screens with varying pixel row quantities lead to inconsistent loads, causing differences in charging time and current between adjacent rows, resulting in uneven brightness and affected display effects.
Innovation Solution
A display substrate design with a compensation area and load compensation units that balance the load between different pixel rows by coupling gate and data lines, using load compensation units with the same configuration as pixel driving circuits to equalize resistance and capacitance loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display screen uses a rounded rectangle or special-shaped area, then the display screen can achieve various shapes and designs, but the quantities of pixels in adjacent rows become inconsistent, leading to uneven brightness
Solution Approach 1:
The patent introduces a compensation area with load compensation units specifically at the rounded corner or special-shaped area where pixel quantities differ. This local compensation mechanism adjusts the load characteristics (resistance and capacitance) in the affected region to match the main display area, ensuring uniform brightness without compromising the overall shape design
Solution Approach 2:
The load compensation unit acts as an intermediary element between the gate line and the pixel units in the compensation area. It mediates the load imbalance by providing additional resistance and capacitance to equalize the charging characteristics, thereby resolving the brightness uniformity issue caused by varying pixel quantities
2Adaptability or versatility
If the quantities of pixels in adjacent rows are different, then the display screen can accommodate varying row configurations, but the load and charging time durations become inconsistent, causing current differences
Solution Approach 1:
The patent applies local quality by introducing load compensation units specifically in the compensation area where row configurations vary. These units provide localized resistance and capacitance adjustments to ensure that the load characteristics remain consistent across all rows, maintaining reliable current distribution despite varying pixel quantities
Solution Approach 2:
The patent changes the electrical parameters (resistance and capacitance) by adding load compensation units in the compensation area. This parameter adjustment equalizes the RC time constants across different rows, ensuring consistent charging time durations and current reliability throughout the display screen
3Adaptability or versatility
If the charging time durations of adjacent rows are different, then the rows can accommodate varying pixel quantities, but the brightness uniformity deteriorates when current difference exceeds specification
Solution Approach 1:
The patent implements local quality by placing load compensation units specifically in the compensation area corresponding to rows with varying pixel quantities. These units locally adjust the resistance and capacitance to equalize charging time durations, ensuring that brightness uniformity is maintained across all rows despite differences in pixel quantities
Solution Approach 2:
The load compensation unit serves as an intermediary that mediates the charging process between the gate line and pixel units in the compensation area. It adjusts the effective RC time constant to match the main display area, thereby preventing brightness non-uniformity caused by excessive current differences
Data Source
AI summary
A display substrate, a method for driving a display substrate and a display device are provided. The display substrate includes a display area, pixel units are arranged in the display area, the display area includes a first area and a second area which are arranged along a second direction, quantities of the pixel units arranged along the first direction in the first area are the same, and a quantity of the pixel units in any row in the second area is less than that of the pixel units in any row in the first area; the display substrate further includes a compensation area, a load compensation unit is arranged in the compensation area, the gate line in the second area and the data line in the first area extend to the compensation area, and the load compensation unit is coupled with the gate line and the data line.