Touch Display Pixel Electrode Sensing Pad Alignment
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Solution Overview
Problem
Conventional touch display devices suffer from reduced display quality due to the visibility of touch sensing elements at certain angles, as the relationship between touch sensing elements and display elements is not considered, affecting the display image.
Innovation Solution
A touch display device is designed with a pixel control layer and a touch sensing layer where each sensing pad corresponds to a pixel electrode, with a liquid crystal layer in between, ensuring that touch sensing elements do not interfere with the display image by aligning sensing pads with light transmitting areas, thus maintaining visual consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch sensing elements are disposed independently from display elements, then touch sensing function is achieved, but display quality deteriorates due to visibility of sensing elements at certain angles
Solution Approach 1:
The patent merges the touch sensing elements with the display elements by establishing a one-to-one correspondence between sensing pads and pixel electrodes. Each sensing pad is positioned at the same location as its corresponding pixel electrode, so that the touch sensing function and display function share the same spatial location, eliminating the visual interference that would occur if sensing elements were independently disposed
Solution Approach 2:
The patent implements multi-functionality by enabling the same structural elements to serve dual purposes: the pixel electrodes serve as both display elements and touch sensing elements, and the light transmitting areas serve as both display regions and sensing regions. This universal arrangement allows the display panel to perform both input and output functions simultaneously without requiring separate independent layers
2Area of stationary object
If sensing pads are positioned independently from pixel electrodes, then touch sensing coverage is maximized, but visual consistency deteriorates due to patterns of sensing pads affecting display image
Solution Approach 1:
The patent applies local quality by ensuring that at each specific location where a pixel electrode exists, a sensing pad is also positioned with identical characteristics. This localized correspondence ensures that the optical properties remain consistent across the entire display area, as each local region has the same structure whether it is being used for display or touch sensing
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 configuration enhances display quality by ensuring that touch sensing elements do not affect the image displayed, achieving visual consistency and maximizing aperture ratio.
Implementation Method 1
a liquid crystal layer disposed between the pixel control layer and the touch sensing layer
Data Source
AI summary
The present disclosure relates to a touch display device. The touch display device comprises a pixel control layer having a plurality of pixel electrodes, a touch sensing layer disposed corresponding to the pixel control layer, wherein the touch sensing layer comprises a plurality of sensing pads and each sensing pad corresponds to each pixel electrode, and a liquid crystal layer disposed between the pixel control layer and the touch sensing layer.