Liquid Crystal Display Panel Layout for Touch-Sensing Precision
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Solution Overview
Problem
Existing display technologies face challenges in providing highly convenient and reliable touch sensing and display capabilities, particularly in stacked display pixels with touch signal lines and grounding regions, and in utilizing common electrodes for both display and touch sensing functions.
Innovation Solution
A display panel design featuring comb-like electrodes with controlled distances and electric connections between electrodes to generate precise electric fields for liquid crystal orientation, combined with a functional layer and insulating films to enhance reliability and convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a common electrode is used for both display and touch sensing functions, then device complexity is reduced and versatility is improved, but measurement precision and reliability of touch sensing may deteriorate
Solution Approach 1:
The common electrode is segmented into two functional regions: a first region serving as a common electrode for display and a second region serving as a touch sensor electrode. This segmentation allows the same physical structure to perform multiple functions while maintaining distinct functional zones with different characteristics optimized for their respective purposes.
Solution Approach 2:
Different regions of the common electrode are designed with different properties: the first region has properties optimized for display function while the second region has properties optimized for touch sensing. This local differentiation enables the electrode to provide both display and touch sensing capabilities with appropriate precision in each region.
2Device complexity
If touch signal lines and grounding regions are grouped in stacked display pixels, then device complexity is reduced, but manufacturing precision and reliability may worsen
Solution Approach 1:
Touch signal lines and grounding regions are merged into a unified structure within the stacked pixel configuration. The touch sensor electrodes are integrated with the display pixel structure, sharing common conductive layers and insulating structures, thereby reducing overall device complexity while maintaining manufacturing feasibility through standardized processes.
3Measurement precision
If comb-like electrodes with controlled distances are used, then liquid crystal orientation control is improved, but device complexity increases
Solution Approach 1:
The comb-like electrode structure creates a non-uniform electric field distribution that dynamically adapts to the liquid crystal material properties. By controlling the distance between adjacent teeth of the comb-like electrodes, the system achieves precise control over liquid crystal orientation through optimized electric field gradients without requiring complex additional control mechanisms.
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 design enables precise control of liquid crystal orientation and efficient touch sensing, allowing for reliable and convenient display and input/output operations, including touch sensing and data processing.
Implementation Method 1
A first distance is provided between the first electrode and the functional layer. The first electrode includes a region overlapping with the layer containing a liquid crystal material and has a comb-like shape. A second distance is provided between the second electrode and the functional layer.
Implementation Method 2
The first display element includes a first electrode, a second electrode, and a layer containing a liquid crystal material
Implementation Method 3
The first electrode includes a region overlapping with the layer containing a liquid crystal material and has a comb-like shape. The second electrode includes a region overlapping with a space between teeth of the comb-like shape of the first electrode.
Data Source
AI summary
A novel display panel that is highly convenient or reliable is provided. The display panel includes a first pixel, a second pixel, and a functional layer. The first pixel includes a first display element, and the second pixel includes a second display element. The functional layer includes a first pixel circuit and a second pixel circuit. The first display element includes a first electrode, a second electrode, and a layer containing a liquid crystal material. A first distance is provided between the first electrode and the functional layer. A second distance is provided between the second electrode and the functional layer. The first electrode and the second electrode each include a region overlapping with the layer containing a liquid crystal material. The second distance is shorter than the first distance. The second display element includes a third electrode, a fourth electrode, and the layer containing a liquid crystal material. A third distance is provided between the third electrode and the functional layer. A fourth distance is provided between the fourth electrode and the functional layer. The fourth distance is shorter than the third distance and longer than the first distance.