Touch Display Panel Spacer Design for Press Resistance
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Solution Overview
Problem
Conventional touch display panels face issues with permanent deformations of main spacers and sensing protrusions leading to reduced press-resistant performance, sensitivity, and increased risk of low-temperature liquid crystal cells due to thermal expansion mismatches, along with alignment errors causing abnormal displaying and decreased aperture ratio.
Innovation Solution
The design incorporates sub-spacers to enhance support and maintain sensing gaps, allowing for increased press resistance and sensitivity while avoiding the need for additional main spacers, using various spacer processes to adjust heights and maintain gap consistency, and selectively fabricating spacers without second electrodes to prevent electrical faults and maintain aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If main spacers are deployed to increase press-resistant performance, then the press-resistant capability is improved, but the sensitivity of touch induction is reduced due to increased active force
Solution Approach 1:
The invention divides the spacer system into multiple types: main spacers for support, sensing protrusions for touch detection, and sub-spacers for auxiliary support. This segmentation allows each component to have optimized dimensions and distribution, enabling the main spacers to provide press resistance while sensing protrusions maintain high sensitivity with smaller deformation requirements
Solution Approach 2:
Different regions of the touch panel have different spacer configurations: main spacers are positioned in non-sensing areas for structural support, while sensing protrusions are positioned in sensing areas for touch detection. This local differentiation ensures that press-resistant performance is improved without compromising touch induction sensitivity in the sensing regions
2Strength
If main spacers are deployed to increase press-resistant performance, then the press-resistant capability is improved, but the risk of low-temperature liquid crystal cells increases due to thermal expansion mismatch
Solution Approach 1:
The spacer system is segmented into main spacers, sensing protrusions, and sub-spacers with different functions and thermal expansion characteristics. This segmentation allows the sensing protrusions to be designed with materials and dimensions that minimize thermal expansion mismatch effects, reducing the formation of low-temperature liquid crystal cells while maintaining press-resistant capability through the main spacers
3Strength
If main spacers are deployed to increase press-resistant performance, then the press-resistant capability is improved, but the aperture ratio is decreased due to alignment errors causing abnormal displaying
Solution Approach 1:
The invention segments the spacer functions by placing main spacers in non-sensing areas and sensing protrusions in sensing areas. This segmentation allows the pixel electrodes to be positioned closer to the center of pixel regions without risk of misalignment with main spacers, thereby increasing the aperture ratio while maintaining press-resistant capability through the non-sensing area spacers
Solution Approach 2:
Different spacer types are positioned in different local regions: main spacers in non-sensing areas for structural support, and sensing protrusions in sensing areas for touch detection. This local quality differentiation eliminates alignment errors between pixel electrodes and main spacers, increasing aperture ratio while maintaining press resistance
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 approach enhances the touch display panel's durability and sensitivity, reduces the risk of low-temperature liquid crystal cells, and increases the aperture ratio by maintaining original sensitivity and press resistance without increasing external touch force, while providing flexibility and versatility in spacer design.
Implementation Method 1
Since the main spacer 128a and the liquid crystal layer 130 respectively have a different coefficient of thermal expansion (CTE), so that the two volumes of the main spacer 128a and the liquid crystal layer 130 are unable to be contracted in a same rate under a low temperature circumstance.
Data Source
AI summary
A touch display panel including a first substrate, a second substrate and a liquid crystal layer is provided. The first substrate includes sensing areas and a non-sensing area outside the sensing areas. Each sensing area is provided with a first electrode thereon. The second substrate includes main spacers, sensing protrusions, first sub-spacers and second sub-spacers. The main spacers are connected to the non-sensing area. The sensing protrusions are corresponding to the sensing area and respectively have a second electrode. A sensing gap exists between each second electrode and the corresponding first electrode. The first sub-spacers are corresponding to the non-sensing area and respectively keep a first sub-spacer gap from the first substrate. The second sub-spacers are corresponding to the non-sensing area and respectively keep a second sub-spacer gap from the first substrate. The sensing gap is greater than the first sub-spacer gap and less than the second sub-spacer gap.