Irregular Display Device Light Shielding Layer and Dual-Layer Wiring
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Solution Overview
Problem
Display devices with irregular shapes face issues of uneven load distribution among signal lines, leading to deteriorated image quality and reduced display area due to the need for rectangular peripheral regions.
Innovation Solution
The display device incorporates a light shielding layer with extension and bent portions, and a dual-layer wiring system with different resistivity materials for the scanning and video signal lines, optimizing the load distribution and allowing for both-side driving of scanning signal lines to maintain image quality and area efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display region has an irregular shape, then the display device can achieve better adaptability and area efficiency, but the in-plane distribution of load on signal lines becomes uneven causing image quality deterioration
Solution Approach 1:
The patent applies local quality by making different parts of the signal lines have different properties. Specifically, the signal lines are designed with varying widths along their lengths, where the width is adjusted according to the local load requirements. Signal lines that need to carry higher loads have larger cross-sectional areas (wider widths), while those with lower loads have smaller cross-sectional areas. This local variation in geometric properties compensates for the uneven load distribution caused by irregular display region shapes, thereby maintaining uniform current density and preventing image quality deterioration.
2Reliability
If signal lines are made to have the same length, then image quality is maintained, but the display area is reduced due to the need for rectangular peripheral regions
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the signal lines, specifically their widths, to adapt to irregular display region shapes. Instead of maintaining uniform signal line lengths or rectangular peripheral regions, the design allows signal lines to have varying lengths and widths. The key parameter that is adjusted is the width of the signal lines, which is changed locally to compensate for length variations and maintain uniform electrical characteristics (such as capacitance and resistance) across all signal lines. This enables the use of irregular display region shapes while maintaining image quality.
3Reliability
If the peripheral region is made rectangular, then signal line load distribution is uniform, but the area occupied by the display region is reduced
Solution Approach 1:
The patent applies asymmetry by deliberately designing the peripheral region with an irregular shape that matches the display region's geometry, rather than using a symmetric rectangular shape. The light shielding layer and signal line routing are designed to follow the irregular contours of the display region. This asymmetric design allows the signal lines to be optimally routed to reach all display elements with approximately equal path lengths, thereby achieving uniform load distribution while maximizing the display area within the available space.
Data Source
AI summary
A light shielding layer overlapping with a peripheral region of a display device includes extension portions each extending along a Y direction, bent portions located between the extension portions, and another extension portion located between the bent portions. In a region overlapping with the another extension portion, an enable line (first potential supply line), which supplies a potential to a plurality of scanning signal lines via a driving circuit (first driving circuit), goes through a wiring layer (first wiring layer) and another wiring layer (second wiring layer) made of a material having resistivity lower than that of the wiring layer.