Touch Display Reflector Integration for Light Extraction
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Solution Overview
Problem
Conventional touch display devices face challenges in securing a light emitting area and enhancing brightness due to the structure, position, or layout of touch electrodes, and suffer from color mixing between adjacent subpixels.
Innovation Solution
A touch display device with a structure that includes a concave portion in the insulation film and a light reflecting member in the non-display area, enhancing light extraction efficiency and preventing color mixing by forming the light reflecting member and touch electrodes in the same process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If touch electrodes are arrayed in a complicated layout to enable touch sensing, then touch sensing function is achieved, but light emitting area is reduced and brightness is lowered
Solution Approach 1:
The touch electrode layout is segmented into functional zones: signal transmission regions with electrode patterns and signal reception regions with sensor patterns. This segmentation allows light emitting areas to be positioned in non-electrode zones, maintaining brightness while preserving touch sensing capability through the distributed electrode-sensor network.
Solution Approach 2:
The patent transitions from planar electrode layouts to three-dimensional micro-cavity structures. The micro-cavities provide vertical light extraction paths, enabling light to escape through the bottom surface of the display panel rather than only through the front, thereby increasing light emitting area and brightness without compromising touch electrode functionality.
2Measurement precision
If touch electrodes are positioned close to each other to improve touch resolution, then sensing precision is enhanced, but color mixing between adjacent subpixels occurs
Solution Approach 1:
The patent implements localized optical management by positioning light blocking structures and color filters at specific locations between adjacent subpixels. This local quality control prevents color mixing in the critical regions between closely-spaced electrodes while maintaining high touch sensing precision through the dense electrode-sensor array configuration.
Solution Approach 2:
Light blocking structures and color filters serve as intermediary elements between adjacent subpixels. These intermediaries prevent optical crosstalk and color mixing while allowing the touch electrode patterns to remain closely spaced for high-resolution touch sensing. The intermediaries mediate the optical interaction between neighboring pixels.
3Reliability
If multiple separate processes are used to form light reflecting members and touch electrodes, then each component can be optimized independently, but manufacturing complexity increases
Solution Approach 1:
The patent combines the formation of light reflecting members and touch electrodes into a single integrated manufacturing process. The electrode patterns are formed simultaneously with the light reflecting structures through co-deposition or combined patterning steps, reducing the total number of process steps while maintaining the optical and electrical performance of both components.
Solution Approach 2:
The electrode patterns serve dual functions: they act as both light reflecting members for enhancing display brightness and as functional touch sensing electrodes. This multi-functionality eliminates the need for separate light reflecting structures and simplifies the manufacturing process while maintaining both display performance and touch sensing capability.
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 structure enhances light extraction efficiency and prevents color mixing, while maintaining a simple processing method for the touch display device.
Implementation Method 1
a light reflecting member provided in a non-display area
Implementation Method 2
at least one concave portion formed in an insulation film
Data Source
AI summary
A display device includes a substrate, a sub-pixel on the substrate and including an organic light emitting diode, an encapsulation layer on the organic light emitting diode, and a plurality of touch electrodes on the encapsulation layer, the plurality of touch electrodes including an open area. The sub-pixel may include first and second emission areas and a first non-emission area in the open area of the plurality of touch electrodes, the first non-emission area being configured to be in a black state or to have a lower brightness than the first and second emission areas. Each of the first non-emission area and at least one of the first and second emission areas may have a shape of an octagon, a circle, an ellipse, a polygon, a triangle, a square, or a hexagon in a plan view.