Scan Line Load Balancing for Uniform Brightness in Displays
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Solution Overview
Problem
Display devices with non-rectangular scan lines of different lengths lead to varying capacitive reactance and load, resulting in unequal voltage application to pixel electrodes, causing noticeable brightness differences between adjacent pixels.
Innovation Solution
Incorporating field-effect elements and load elements connected to scan lines in non-display areas to adjust interconnection loads, ensuring consistent voltage application across pixel electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If scan lines of different lengths are used in non-rectangular display areas, then the display area shape flexibility is improved, but brightness uniformity deteriorates due to varying interconnection loads
Solution Approach 1:
The patent applies local quality by connecting load elements selectively to specific scan lines based on their length. Scan lines with shorter lengths (higher capacitive reactance) are connected to load elements, while longer scan lines are not. This localized adjustment compensates for the varying interconnection loads across different scan lines, ensuring uniform brightness distribution throughout the display area while maintaining the flexibility of non-rectangular display shapes.
2Illumination intensity
If load elements are connected to scan lines of varying lengths, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The patent changes the electrical parameters of the scan lines by introducing load elements with specific capacitance values. The load elements are designed with capacitance values that correspond to the inverses of the square roots of the scan line lengths, transforming the varying interconnection loads into uniform effective loads. This parameter-based approach provides a systematic method to achieve brightness uniformity without requiring complex control circuits or additional active components.
Data Source
AI summary
A display device may include a substrate; a plurality of signal lines on the substrate; a plurality of scan lines on the substrate, the scan lines crossing the signal lines; and a plurality of thin film transistors at crossing positions of the scan lines and the signal lines. The scan lines include some first scan lines and some second scan lines. Each of the second scan lines has an end connected to a load element.