Photosensitive TFT Array Substrate for Touch Display
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Solution Overview
Problem
Existing touch display devices are prone to errors in touch control due to high production costs and the need for separate touch panels, leading to erroneous operations and reduced market competitiveness.
Innovation Solution
An array substrate integrating touch function into sub-pixel units using photosensitive TFTs with floating gates, connected to DC power and touch sensing lines, which absorb infrared radiation to enable touch sensing, eliminating the need for additional touch panels and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate touch panel is used, then touch control function is provided, but device thickness increases and production cost rises
Solution Approach 1:
The patent combines the touch panel and liquid crystal display panel into a single integrated structure. The touch sensing electrodes are formed on the same substrate as the liquid crystal display electrodes, eliminating the need for separate touch panels and reducing overall device thickness while maintaining both display and touch control functions.
Solution Approach 2:
The patent creates a multi-functional panel where the same electrode structure serves both display and touch sensing purposes. By using transparent conductive materials and designing electrodes that can function as both liquid crystal control elements and touch sensing elements, the panel achieves universal functionality with reduced component count.
2Adaptability or versatility
If a separate touch panel is manufactured, then touch control function is provided, but production cost increases
Solution Approach 1:
The patent merges the manufacturing processes of touch panels and liquid crystal displays into a single integrated fabrication line. By forming both touch sensing electrodes and display electrodes on the same substrate using similar material deposition and patterning techniques, the patent eliminates separate manufacturing steps and reduces production costs.
Solution Approach 2:
The patent designs a universal electrode structure that performs dual functions as both display control electrodes and touch sensing electrodes. This multi-functional design allows a single manufacturing process to produce both functional layers simultaneously, reducing the need for additional materials and processing steps.
3Adaptability or versatility
If separate touch panel and liquid crystal panel are assembled, then touch control function is provided, but transmittance and contrast are reduced
Solution Approach 1:
The patent integrates touch sensing electrodes and liquid crystal display electrodes into a single layered structure on the same substrate. This eliminates the need for additional glass layers and bonding interfaces that would otherwise reduce light transmittance and display contrast, while still providing complete touch control functionality.
Solution Approach 2:
The patent uses transparent conductive films with optimized thickness and material composition to maintain high light transmittance. The thin film electrode structures provide sufficient electrical conductivity for touch sensing while minimizing optical interference and maintaining display quality.
4Length of stationary object
If embedded touch technology is used, then device thickness is reduced, but erroneous operations occur due to touch control errors
Solution Approach 1:
The patent implements different electrode patterns and material properties in different regions of the display panel to optimize both touch sensing accuracy and display performance. By locally adjusting electrode geometry, spacing, and conductivity, the patent reduces false touch detection while maintaining thin profile.
Solution Approach 2:
The patent incorporates touch sensing feedback mechanisms that distinguish between deliberate user input and inadvertent contact. The integrated electrode structure provides feedback signals that help differentiate between intentional touches and accidental contact with other objects, reducing erroneous operations.
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 integration of touch function into sub-pixel units reduces production costs and prevents erroneous operations by directly sensing touch inputs, enhancing the display device's performance and competitiveness.
Implementation Method 1
photosensitive TFTs with floating gates, connected to DC power and touch sensing lines, which absorb infrared radiation to enable touch sensing
Implementation Method 2
photosensitive TFT... which absorb infrared radiation to enable touch sensing
Data Source
AI summary
The invention provides an array substrate and touch display device. The array substrate comprises: a plurality of sub-pixel units arranged in array, a plurality of touch sensing lines and DC power lines; a touch sensing line being provided for each column of sub-pixel units, and a DC power line being provided for each row of sub-pixel units, each sub-pixel unit comprising a photosensitive TFT, and the photosensitive TFT having a floating gate, a source electrically connected to the corresponding DC power line, and a drain electrically connected to the corresponding touch sensing line. The photosensitive TFT absorbs infrared radiation emitted by biological being when touched by biological being, thereby achieving conduction to transmit the voltage on DC power line to touch sensing line to complete touch sensing. The touch function is integrated into sub-pixel unit. No additional touch panel is required, which can reduce production cost and prevent erroneous operation.