Display Panel Shielding Layout for Non-Display Light Leakage
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Solution Overview
Problem
Display panels experience light leakage in the non-display region due to gaps between the edge of the light-shielding layer and touch signal lines, which are not fully covered by the light-shielding layer, leading to visible light reflection and interference with the display's off-screen state.
Innovation Solution
Incorporating a light-shielding layer and additional light-shielding lines that overlap and extend between the edge of the light-shielding layer and touch signal lines to block light leakage regions, ensuring complete coverage and reducing visible light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the light-shielding layer is positioned close to the display region to maximize display area, then the display area is increased, but light leakage occurs in the gaps between the light-shielding layer edge and touch signal lines
Solution Approach 1:
The light-shielding structure is divided into two segments: the light-shielding layer and the light-shielding lines. The light-shielding layer provides primary shielding coverage, while the light-shielding lines fill the gaps between the light-shielding layer edge and the touch signal lines. This segmentation allows the display area to be maximized while light leakage is prevented through complementary coverage from both segments.
Solution Approach 2:
Different regions of the non-display region receive different levels of light shielding. The light-shielding layer provides comprehensive shielding over most of the non-display region, while the light-shielding lines provide targeted local shielding specifically in the gap regions between the light-shielding layer edge and the touch signal lines, addressing the local quality issue of light leakage without affecting the overall display area.
2Object-affected harmful factors
If the light-shielding layer is extended further into the non-display region to cover gaps, then light leakage is reduced, but the area available for touch signal lines and circuit structures is reduced
Solution Approach 1:
The light shielding function is segmented between the light-shielding layer and the light-shielding lines. The light-shielding layer can be positioned closer to the display region without extending too far into the non-display region, while the light-shielding lines are specifically placed in the gap regions to provide targeted shielding. This segmentation allows optimal use of the non-display region area while preventing light leakage.
Solution Approach 2:
Instead of uniformly extending the light-shielding layer throughout the non-display region, the light-shielding lines provide localized shielding only where needed - in the gaps between the light-shielding layer edge and the touch signal lines. This local quality approach prevents light leakage without unnecessarily reducing the area available for touch signal lines and circuit structures.
3Object-affected harmful factors
If additional light-shielding lines are added to cover gaps, then light leakage is prevented, but the device structure becomes more complex
Solution Approach 1:
The light-shielding lines are merged with existing structural elements in the display panel. They are formed in the same non-display region where touch signal lines and circuit structures are already present, and they can be integrated into the existing manufacturing process. This merging approach prevents light leakage while minimizing the increase in device complexity by utilizing existing spatial and process resources.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents light leakage by fully covering the gaps, enhancing the display panel's appearance and reducing interference from reflected light in the non-display region.
Implementation Method 1
the light-shielding layer is located in the non-display region and at least partially surrounds the display region... the at least one light-shielding line is located in the non-display region... an orthographic projection of a first part of the at least one light-shielding line on the substrate is overlapped with an orthographic projection of the light-shielding layer on the substrate
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a substrate, a light-shielding layer, a touch signal line, and at least one light-shielding line; the light-shielding layer is in the non-display region and at least partially surrounds the display region; the touch signal line is in the non-display region and at least partially surrounds the display region; and the at least one light-shielding line is in the non-display region and at least partially surrounds the display region; the at least one light-shielding line is arranged along a direction from the display region to the non-display region, an orthographic projection of the at least one light-shielding line on the substrate is between an edge of the orthographic projection of the light-shielding layer on the substrate close to the display region and an edge of the touch signal line away from the display region.