Integrated Touch Display Panel Thickness Reduction via Substrate Merging
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Solution Overview
Problem
Existing display devices with integrated touch screen panels face challenges in integrating touch sensing functionality without increasing device thickness and maintaining image visibility, as separate fabrication and attachment of touch screens can lead to increased thickness and degraded image quality.
Innovation Solution
A display device with sensing patterns formed on the top surface of an upper substrate, connected by sensing lines, and a light-shielding pattern covering the sealing area, allowing for integration of touch screen and display panels, reducing thickness and improving visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate touch screen and display panels are fabricated and attached, then touch sensing functionality is achieved, but device thickness increases and image visibility degrades
Solution Approach 1:
The patent merges the touch screen panel and display panel into a single integrated structure where sensing patterns are formed directly on the upper substrate of the display device. This eliminates the need for separate touch screen fabrication and attachment, thereby reducing device thickness while maintaining touch sensing functionality.
Solution Approach 2:
The upper substrate serves multiple functions: it acts as both the display panel substrate and the touch screen substrate. The sensing patterns formed on this substrate enable touch sensing, while the substrate itself provides the display structure, achieving multi-functionality with a single component.
2Reliability
If separate touch screen and display panels are attached, then touch sensing is enabled, but dead spaces increase and structural integrity decreases
Solution Approach 1:
By combining the touch screen and display panels into one integrated structure, the patent eliminates dead spaces that would exist between separately attached panels. The sensing patterns are formed directly on the display panel's upper substrate, ensuring continuous coverage and structural integrity across the entire active area.
3Object-affected harmful factors
If black matrix is continuous in sealing area, then light leakage is prevented, but laser transmission for sealing is blocked
Solution Approach 1:
The black matrix is segmented or opened in the sealing area to create a discontinuous structure. This allows laser transmission for sealing while maintaining light shielding in the display area. The opened regions are strategically positioned to enable manufacturing processes without compromising the overall light leakage prevention function.
Solution Approach 2:
The black matrix has different properties in different regions: it is continuous and light-blocking in the display area, but opened or discontinuous in the sealing area to allow laser transmission. This local variation in structure optimizes both light leakage prevention and manufacturing ease.
4Length of stationary object
If sensing patterns are formed on upper substrate, then integration is achieved and thickness reduced, but light leakage may occur at edges
Solution Approach 1:
The integration of sensing patterns on the upper substrate reduces thickness, while the light-shielding pattern is added to address edge light leakage. This combined approach maintains the benefits of integration while mitigating the potential for light leakage at the edges of the sensing area.
Data Source
AI summary
A display device with an integrated touch screen panel includes upper and lower substrates each divided into a display area and a non-display area, which is provided outside of the display area and includes a sealing area. Pixels may be formed in the display area between the upper and lower substrates. A black matrix is formed on a bottom surface of the upper substrate and disposed in the display area and the non-display area. The black matrix is open in the sealing area. Sensing patterns may be formed in the display area on a top surface of the upper substrate. Sensing lines may be formed in the non-display area on the top surface of the upper substrate and connected to the sensing patterns along a first or second direction. A light-shielding pattern is formed to cover the sealing area of the non-display area on the top surface of the upper substrate.