Touch Line Patterning for Uniform Contrast in Display Bezels
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Solution Overview
Problem
Display apparatuses experience non-uniform contrast ratios due to increased resistance and reflected light in non-active areas, causing darker appearance and aesthetic issues.
Innovation Solution
Incorporating a pattern in the touch lines to scatter external light and increase transmission, using a front member with transmissive and blocking parts to uniform the contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch line is made thicker to reduce resistance and RC delay, then electrical performance is improved, but the contrast ratio becomes non-uniform and the display appears darker in the non-active area
Solution Approach 1:
The patent applies different line widths to different sections of the touch line. The first touch line in the non-active area has a first line width optimized for electrical performance, while the second touch line overlapping the active area has a second line width (narrower than the first) to minimize light blocking. This local differentiation resolves the contradiction by allowing thick lines where needed for electricity and thin lines where needed for display quality.
Solution Approach 2:
The touch line is segmented into multiple sections with different characteristics. The first touch line section connects the touch driving circuit to the touch electrode, while the second touch line section overlaps with the active display area. Each segment is optimized independently for its specific function, allowing the overall system to achieve both good electrical performance and uniform contrast ratio.
2Reliability
If the touch electrode is made opaque to block light in the non-emission area, then touch functionality is improved, but reflected light from metal electrodes and wiring lines creates non-uniform contrast
Solution Approach 1:
The front member is designed with spatially varying optical properties. The first region corresponds to the non-active area where the touch line is thicker, and the second region corresponds to the active area where the touch line is narrower. This local differentiation in the front member's structure compensates for the varying light blocking effects of the touch lines, achieving uniform contrast across the display.
3Illumination intensity
If the touch line is made narrower to improve contrast ratio, then display appearance is improved, but resistance and RC delay increase
Solution Approach 1:
The touch line is divided into functional segments: the first touch line section with larger width for low resistance in the non-active area, and the second touch line section with smaller width for minimal light blocking in the active area. This segmentation allows each part to be optimized for its primary function without compromising the other.
Solution Approach 2:
The front member combines multiple functions: it serves as both a protective cover and an optical compensation element. By integrating the optical compensation function into the front member's structure (with its first and second regions), the patent simultaneously achieves mechanical protection and contrast uniformity while maintaining the electrical performance of the segmented touch lines.
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 enhances the display apparatus's reliability and aesthetic appeal by uniformly transmitting light, reducing non-uniform contrast and improving the overall appearance.
Implementation Method 1
the first touch line includes at least two patterns
Data Source
AI summary
A display apparatus includes a substrate having an active area and a non-active area adjacent to the active area defined thereon; a first touch line in the non-active area and a second touch line on the first touch line; and a front member on the first and second touch lines, the front member being in at least a part of the non-active area, and including a transmissive part and a blocking part, wherein the first touch line is in an area overlapping the transmissive part, and the first touch lines includes at least two patterns.