Touch Display Panel Metal Grid Aperture Ratio Optimization

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Solution Overview

Problem

Conventional organic light-emitting display panels face issues with display effect, including color shift and reduced resolution due to varying light-emitting region sizes when viewed from different directions, and low aperture ratio affecting pixel density and user experience.

Innovation Solution

The touch display panel features a substrate with a light-emitting device layer and touch electrodes arranged as a metal grid, where the distance between the light-emitting region and the touch electrode edge is standardized (1 μm to 20 μm) to maintain uniform light-emitting region sizes across pixels, reducing color shift and enhancing aperture ratio.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the touch electrode is placed close to the light-emitting region to improve aperture ratio, then the aperture ratio is improved, but the light-emitting region size varies when viewed from different directions causing color shift and reduced display quality

Engineering Contradiction:
Improveaperture ratioVSAvoidlight-emitting region size uniformity
Core Design Contradiction:
Area of stationary objectVSManufacturing precision

Solution Approach 1:

The patent applies local quality by differentiating the distance relationships between touch electrodes and light-emitting regions based on pixel color types. First color pixels (e.g., red) have a first distance d1 between 1-20 μm, while second color pixels (e.g., green and blue) have a second distance d2 between 10-30 μm. This localized differentiation allows each color to compensate for its specific light leakage characteristics, achieving uniform perceived light-emitting region sizes across all colors when viewed from different directions, thereby resolving the color shift issue while maintaining high aperture ratio.

Inventive Principle:
Principle #3Local quality

2Manufacturing precision

If the distance between light-emitting region and touch electrode is increased to suppress color shift, then color shift is reduced, but the aperture ratio decreases affecting resolution and pixel density

Engineering Contradiction:
Improvelight-emitting region size uniformityVSAvoidaperture ratio
Core Design Contradiction:
Manufacturing precisionVSArea of stationary object

Solution Approach 1:

The patent employs parameter changes by precisely controlling the distance parameters d1 and d2 between touch electrodes and light-emitting regions within specific ranges (d1: 1-20 μm, d2: 10-30 μm). These parameter optimizations allow the light-emitting regions to maintain uniform apparent sizes when viewed from different directions, suppressing color shift. Simultaneously, by keeping these distances within minimal ranges, the aperture ratio is maximized, thereby achieving both display quality and high resolution with high PPI.

Inventive Principle:
Principle #35Parameter changes

3Manufacturing precision

If different distance offsets are used for different color pixels to correct color shift, then color shift is suppressed, but the device complexity increases due to multiple distance parameters

Engineering Contradiction:
Improvecolor uniformityVSAvoiddistance parameter management
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent implements local quality by assigning different distance parameters to different color pixel groups: first color pixels (e.g., red) use distance d1 within 1-20 μm, while second color pixels (e.g., green and blue) use distance d2 within 10-30 μm. This localized parameter differentiation addresses the specific light leakage characteristics of each color, effectively suppressing color shift. The complexity is managed by systematically organizing these parameters according to color types, making the design both effective and implementable.

Inventive Principle:
Principle #3Local quality

Data Source

PatentUS10955948B2Touch display panel and touch display device
Publication Date: 2021.03.23 SHANGHAI TIANMA MICRO ELECTRONICS CO LTD
  • US10955948B2 patent drawing
  • US10955948B2 patent drawing
  • US10955948B2 patent drawing

AI summary

A touch display panel and a touch display device are provided. The touch display panel includes: a substrate, a light-emitting device layer arranged on the substrate, and multiple touch electrodes arranged on the side of the light-emitting device layer away from the substrate. The light-emitting device layer includes multiple pixels, and each of the pixels has a light-emitting region and a non-light-emitting region on the periphery of the light-emitting region. Each of the touch electrodes has a structure of a metal grid. The pixels include first color pixels, and grid lines of the metal grid are arranged in each of the non-light-emitting regions of at least a part of the first color pixels.