Touch Display Light Extraction via Guide Opening Reflection
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Solution Overview
Problem
Touch display apparatuses face reduced light extraction efficiency due to touch electrodes and bridge electrodes reflecting obliquely emitted light away from the light-emitting device, leading to decreased front luminance in pixel regions.
Innovation Solution
A touch display apparatus with a touch structure on an encapsulating element covering the light-emitting device, featuring a touch insulating layer with guide openings overlapping the light-emitting device, where the side of the guide opening is partially covered by touch electrodes with a higher reflectance than the upper surface, and a multi-layer structure of touch electrodes with varying reflectance to optimize light reflection and extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch electrodes and bridge electrode are disposed close to the light-emitting device to enable touch functionality, then touch capability is achieved, but light extraction efficiency is decreased due to reflection of obliquely emitted light
Solution Approach 1:
The touch insulating layer is configured with different properties in different regions: it has a guide opening in the pixel region to improve light extraction, while maintaining continuous coverage in the non-pixel region for touch functionality. This local differentiation allows the structure to simultaneously achieve both touch capability and improved light extraction efficiency in different areas.
Solution Approach 2:
The touch insulating layer is segmented into different functional regions: a pixel region with a guide opening that allows obliquely emitted light to pass through to the touch structure, and a non-pixel region that provides continuous insulation. This segmentation enables the structure to perform both light extraction and touch detection functions simultaneously.
2Loss of energy
If touch electrodes are spaced apart from the light-emitting device to reduce light reflection, then light extraction efficiency is improved, but touch electrode area is reduced affecting touch sensitivity
Solution Approach 1:
The touch insulating layer acts as an intermediary structure between the light-emitting device and the touch electrodes. It includes a guide opening that directs obliquely emitted light toward the touch electrodes while maintaining their spacing, thus improving light extraction efficiency without requiring the electrodes to be positioned too close to the light-emitting device.
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
Improves light extraction efficiency and front luminance of each pixel region by effectively reflecting obliquely emitted light back into the display area, enhancing image quality.
Implementation Method 1
Light obliquely emitted from the light-emitting device with an inclination may be reflected inward by the touch electrodes and/or the bridge electrode
Implementation Method 2
A touch insulating layer is disposed between the touch electrodes and the bridge electrode. The touch insulating layer includes a guide opening. The guide opening overlaps with the light-emitting device
Data Source
AI summary
A touch display apparatus is provided. In the touch display apparatus, a touch structure may be disposed on an encapsulating element covering a light-emitting device. A touch insulating layer may be disposed between a touch electrode and a bridge electrode of the touch structure. The touch insulating layer may include a guide opening on a path of light emitted from the light-emitting device. A side of the guide opening may be covered by the touch electrode. Thus, in the touch display apparatus, the front luminance may be improved.