In-cell OLED Touch Display with Conductive Polymer Sensing
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Solution Overview
Problem
Conventional touch display panels require a sensing layer made of ITO material on glass substrates, increasing manufacturing costs and complexity, and necessitating high power consumption due to low light penetration rates, which is disadvantageous for mobile devices.
Innovation Solution
An in-cell touch display structure that integrates a thin film transistor and sensing electrode layer on one substrate, eliminating the need for ITO on both substrates, and utilizing a black matrix layer and OLED layer to enhance light penetration and reduce manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensing layer made of ITO material is provided on both upper and lower glass substrates, then touch sensing function is achieved, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent extracts the sensing function from the traditional ITO sensing layers on both substrates and relocates it to conductive polymer layers formed only on the lower substrate. This extraction eliminates the need for ITO material and simplifies the manufacturing process while maintaining touch sensing capability through the conductive polymer composite layers.
Solution Approach 2:
The conductive polymer composite layers serve multiple functions: they provide touch sensing capability, act as electrode structures, and integrate with the OLED display layers. This multi-functionality eliminates the need for separate ITO sensing layers and reduces overall device complexity.
2Reliability
If a sensing layer made of ITO material is provided on both upper and lower glass substrates, then touch sensing function is achieved, but material cost increases
Solution Approach 1:
The patent extracts the sensing function from expensive ITO material and replaces it with conductive polymer composite layers formed on the lower substrate only. This substitution significantly reduces material cost while maintaining touch sensing functionality.
Solution Approach 2:
The patent uses conductive polymer materials that are cheaper than ITO to create the sensing layers. These polymer-based conductive layers provide the necessary electrical properties at lower material cost, making the overall device more cost-effective.
3Reliability
If conventional touch panel structure is used with multiple layers, then touch sensing is achieved, but light penetration rate decreases
Solution Approach 1:
The patent extracts the sensing function from the traditional multi-layer ITO structure and consolidates it into conductive polymer layers integrated with the OLED structure. This extraction reduces the number of separate transparent layers, thereby improving light penetration rate while maintaining touch sensing capability.
Solution Approach 2:
The patent merges the sensing electrode function with the OLED display structure by integrating conductive polymer layers into the existing display architecture. This merging eliminates redundant layers and improves light transmission while preserving touch sensing functionality.
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 design reduces material and processing costs, simplifies manufacturing, and increases light penetration rates, resulting in a more efficient and cost-effective touch display panel with improved brightness.
Implementation Method 1
an OLED layer configured between the upper substrate and the lower substrate
Data Source
AI summary
An in-cell touch display structure includes: an upper substrate, a lower substrate, a liquid crystal layer configured between the upper and lower substrates; a black matrix layer, and a thin film transistor and sensing electrode layer. The thin film transistor and sensing electrode layer includes a gate line sub-layer having a plurality of gate lines and a plurality of connection segments separated by the gate lines, and a source line sub-layer having a plurality of source lines and a plurality of sensing conductor segments separated by the source lines, wherein part of the sensing conductor segments and part of the connection segments are electrically connected together to form a plurality of sensing conductor blocks.