Embedded Capacitive Touch Display Panel Gap Alignment
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Solution Overview
Problem
Embedded touch screens experience visible defects and reduced display quality due to the reflection of light on metal touch electrodes, particularly when gaps between sensing and driving electrodes align with green color resist bars, leading to highlighted patterns and decreased brightness.
Innovation Solution
The positions of gaps between sensing and driving electrodes are optimized to avoid alignment with green color resist bars, allowing for improved display performance without affecting touch functionality by keeping the gaps parallel to red or blue color resist bars, thus minimizing visibility of touch electrode patterns under standard backlight conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gaps between sensing and driving electrodes are formed to insulate them, then electrical insulation is achieved, but visible patterns and reduced display quality occur due to light reflection at gap positions
Solution Approach 1:
The patent applies local quality by making the color filter layer properties position-dependent: at gap positions, the color filter has different optical characteristics (higher reflectivity or different spectral response) compared to non-gap positions. This local differentiation allows the gaps to provide electrical insulation while the color filter compensates for light reflection issues, maintaining display quality by adjusting local optical properties rather than changing the overall structure.
2Ease of operation
If metal touch electrode layer is provided to enable touch functionality, then capacitive touch is achieved, but light reflection causes visible patterns and electricity leakage in TFTs
Solution Approach 1:
The color filter layer serves as an intermediary between the metal touch electrode layer and the TFT array. It mediates the harmful effects by absorbing or filtering reflected light before it reaches the TFTs, reducing visible patterns and electricity leakage. The color filter thus protects the TFTs from direct exposure to reflected light while allowing the metal electrode layer to maintain its touch functionality.
3Illumination intensity
If backlight intensity is increased to improve display brightness, then illumination is enhanced, but gap patterns become more highlighted and visible
Solution Approach 1:
The color filter layer implements local quality by having position-dependent optical properties that specifically address the gap regions. At gap positions, the color filter is designed with enhanced light absorption or modified reflectivity characteristics that counteract the reflection effects even when backlight intensity is increased. This allows the display to achieve higher brightness without proportionally increasing pattern visibility, as the local filter properties compensate for the reflected light at gap positions.
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 enhances display quality by reducing the visibility of touch electrode patterns and maintaining touch functionality, as the green color resist's high contribution to brightness is mitigated, preventing pattern highlighting under increased backlight intensity or TFT off-state current.
Implementation Method 1
the green color resist's high contribution to brightness is mitigated, preventing pattern highlighting under increased backlight intensity or TFT off-state current
Implementation Method 2
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
Data Source
AI summary
The application discloses an embedded capacitive touch display panel and an embedded capacitive touch display device, including: a first transparent substrate, and a grid-shaped metal conductive layer, formed on the first transparent substrate, including a number of touch electrodes separate from each other with gaps being formed between them, wherein the embedded capacitive touch display panel further includes a color filter layer including at least red color resists, green color resists, and blue color resists, wherein the color resists in the same colors are arranged in respective color resist bars, and the color resist bars include green color resist bars; and the gaps include first gap sections which are parallel to the color resist bars, and which do not overlap with the green color resist bars. Since the green color resists contribute to display brightness far more than the color resists of the other colors, the first gap sections can be arranged so that they do not overlap with the green color resist bars to thereby alleviate the problem of a visible pattern of the touch electrodes so as to improve the display performance of the embedded capacitive touch display panel without degrading a touch effect.