Touch Layer Light Blocking for Display Side Viewing Control
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Solution Overview
Problem
Display devices face challenges in varying the side viewing angle of images and preventing side light leakage from pixels, particularly in light emitting display devices.
Innovation Solution
The display device incorporates first and second pixels with light emitting elements, conductive patterns including touch electrodes, a first and second light blocking layer, and a light blocking pattern in the touch sensing layer to control light emission and viewing angles, allowing for differentiated side viewing angles and reduced side light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If light blocking layers are added to prevent side light leakage, then image privacy is improved, but device complexity increases
Solution Approach 1:
The patent implements nested light blocking structures where a first light blocking layer is positioned between the emission area and color filter, and a second light blocking layer is positioned between the color filter and touch sensing layer. This nested arrangement systematically prevents side light leakage from reaching different viewing angles, thereby protecting image privacy while maintaining a structured and manageable device architecture.
Solution Approach 2:
The patent addresses side light leakage by introducing light blocking layers at multiple vertical positions within the display structure. By controlling light propagation in the vertical dimension (between different layers) rather than only in the horizontal plane, the patent effectively prevents side light leakage without significantly increasing lateral device complexity.
2Adaptability or versatility
If multiple light blocking layers are implemented, then side viewing angle control is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the light blocking function into two separate layers: a first light blocking layer positioned closer to the emission area and a second light blocking layer positioned closer to the color filter. This segmentation allows each layer to be optimized for specific viewing angle ranges, improving overall side viewing angle control while enabling independent optimization of each layer's manufacturing process.
Solution Approach 2:
The patent applies light blocking structures with different characteristics at different locations within the display. The first light blocking layer has different optical properties compared to the second light blocking layer, allowing each layer to be tailored for specific viewing angle requirements. This local differentiation improves viewing angle control without requiring uniform complexity across the entire device.
Data Source
AI summary
A display device according to an embodiment 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. The display device further includes a light blocking pattern disposed in a same layer as at least one of the conductive patterns of the touch sensing layer and surrounding the emission areas of the some pixels.