Embedded Capacitive Touch Display Panel Gap Optimization

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Solution Overview

Problem

Embedded capacitive touch displays suffer from visible defects in metal touch electrode patterns due to light reflection issues, particularly when gaps between sensing and driving electrodes align with the green color resist, leading to reduced display quality under increased backlight intensity.

Innovation Solution

The positions of gaps between sensing and driving electrodes are optimized to avoid alignment with the green color resist bar, allowing the gaps to be placed on red or blue color resist bars instead, thereby minimizing the visibility of touch electrode patterns and enhancing display performance without affecting touch functionality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the gaps between sensing electrodes and driving electrodes are positioned on the color filter layer, then the touch electrode structure can be realized, but the light reflection causes visible patterns and reduced display quality

Engineering Contradiction:

Improvetouch electrode structure implementationVSAvoidlight reflection causing visible patterns

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by differentiating the treatment of gaps based on their position relative to color resist bars. Gaps are specifically positioned to avoid alignment with green color resist bars, while other positioning rules apply to red and blue color resist bars. This localized differentiation resolves the contradiction by making the gap positioning strategy context-dependent rather than uniform, thereby reducing visible patterns while maintaining touch functionality.

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If the backlight source intensity is increased to improve display brightness, then the display brightness is improved, but the visible patterns of touch electrodes become more prominent

Engineering Contradiction:

Improvedisplay brightnessVSAvoidvisibility of touch electrode patterns

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by pre-positioning the gaps between electrodes to specific locations on the color filter layer that minimize light reflection effects. By strategically placing gaps to avoid alignment with green color resist bars and to align with red or blue color resist bars before the display operates, the design proactively prevents the harmful effect of visible patterns from becoming prominent even when backlight intensity is increased.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If the TFT off-state current is increased to improve display performance, then the display performance is improved, but the patterns of gaps between electrodes are highlighted

Engineering Contradiction:

Improvedisplay performanceVSAvoidhighlighting of gap patterns

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by implementing different positioning strategies for gaps based on their location relative to different color resist bars. The specific rule that gaps should avoid alignment with green color resist bars while having different requirements for red and blue color resist bars creates a localized optimization that reduces the highlighting of gap patterns while maintaining overall display performance.

Inventive Principle:

Principle #3Local quality

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

This solution effectively reduces the visibility of touch electrode patterns and improves display quality by adjusting the placement of gaps relative to color resist bars, ensuring consistent image presentation across the LCD screen even under varying backlight conditions.

Implementation Method 1

a color filter layer, including a plurality of red color resist units, a plurality of green color resist units, and a plurality of blue color resist units

Methodology Applied

Scientific EffectLight absorption and color filtering: Absorption (EM radiation)

Implementation Method 2

when a liquid crystal display works, because a light L emitted by a backlight module is irradiated on the metal touch electrode layer 14, the light L is partly reflected on the channels of TFTs on the TFT array structure layer of the lower substrate 11 by the metal touch electrode layer 14 to cause an electricity leakage phenomenon of the TFTs

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS9436327B2Embedded capacitive touch display panel and embedded capacitive touch display device

Publication Date: 2016.09.06 SHANGHAI TIANMA MICRO ELECTRONICS CO LTD

AI summary

An embedded capacitive touch display panel is disclosed. The display panel includes a first transparent substrate, and a grid-shaped metal conductive layer formed on the first transparent substrate. The grid-shaped metal conductive layer includes first metal electrodes extending in a first direction, and second metal electrodes extending in a direction intersecting the first direction. Each of the second metal electrodes is divided into multiple sections by openings, through which the first metal electrodes extend. In addition, the first and second metal electrodes are separated from each other by gaps. The display panel also includes a color filter layer, including a plurality of red, green, and blue color resist units, and a green color resist bar. The gaps include a first gap part, parallel to the green color resist bar, where the first gap part is not overlapped by the green color resist bar.