Touch Layer Light Blocking for Privacy Viewing Displays
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Solution Overview
Problem
Display devices face challenges in varying the side viewing angle of images and preventing light leakage from pixels, particularly in light emitting display devices.
Innovation Solution
Incorporating first and second light blocking layers and a light blocking pattern in the touch sensing layer to control the side viewing angle and prevent light leakage, with conductive patterns and touch electrodes integrated in the same layer as the light blocking patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light blocking layers are added to control side viewing angle and prevent light leakage, then image privacy and security are improved, but device structure becomes more complex
Solution Approach 1:
The light blocking function is segmented into multiple layers: a first light blocking layer with a first light blocking pattern, a second light blocking layer with a second light blocking pattern, and integration with the touch sensing layer containing a third light blocking pattern. Each layer serves specific portions of the pixel array, allowing selective light blocking in different regions to achieve comprehensive privacy protection while maintaining manufacturing feasibility through divided implementation.
2Reliability
If multiple light blocking layers are integrated into the display structure, then light leakage prevention is improved, but manufacturing process becomes more difficult
Solution Approach 1:
The third light blocking pattern is integrated into the touch sensing layer, merging the light blocking function with the existing touch sensing structure. This integration allows the light blocking layer to be formed simultaneously with the touch sensing layer during the same manufacturing process, eliminating the need for separate light blocking layer fabrication and reducing overall manufacturing complexity despite the multi-layer light blocking structure.
Data Source
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AI summary
A display device includes pixels including light emitting elements disposed in respective emission areas, conductive patterns disposed in a touch sensing layer on the light emitting elements and including a touch electrode, a first light blocking layer disposed on the touch sensing layer and disposed in a non-emission area around the emission areas to surround the emission areas, and a second light blocking layer disposed on the first light blocking layer and surrounding the emission areas of some of the pixels, and the display device further includes a light blocking pattern disposed in the same layer as at least one of the conductive patterns of the touch sensing layer and surrounding the emission areas of the some pixels.