Integrated LCD Touch Panel Using Electrode Gap Conduction
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Solution Overview
Problem
Existing liquid crystal display (LCD) devices with integrated touch panels face challenges in manufacturing costs, size, weight, and accuracy due to the need for multiple layers and reliance on external light sources for input detection, which complicates the identification of touch commands.
Innovation Solution
The LCD device incorporates a novel structure with a first and second substrate, electrodes, isolating layers, and a conductor that allows for electrical connection between electrodes upon touch, enabling accurate touch command detection without additional touch panels, thereby simplifying the manufacturing process and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a resistive touch panel is integrated with an LCD panel using adhesion glue film, then touch functionality is achieved, but manufacturing cost increases, size increases, and weight increases
Solution Approach 1:
The patent combines the touch detection function and display function into a single integrated structure. The LCD panel itself serves as the touch sensor by utilizing its liquid crystal layer and electrode structures to detect touch input, eliminating the need for a separate resistive touch panel assembly. This merging reduces the number of layers, simplifies manufacturing, and decreases both size and weight while maintaining touch functionality.
Solution Approach 2:
The LCD panel is designed to perform multiple functions: display and touch detection. The liquid crystal layer and electrode structures are configured to respond to both optical signals for display and mechanical pressure for touch input. This multi-functionality allows the single component to replace what would traditionally require separate dedicated touch panel and display panel assemblies.
2Adaptability or versatility
If a resistive touch panel with multiple layers is used, then touch command detection is achieved, but manufacturing cost increases
Solution Approach 1:
The patent merges the touch sensor functionality into the existing LCD manufacturing process. The touch detection elements are formed using the same liquid crystal and electrode layers that are already present in the display structure, allowing touch functionality to be added without requiring separate manufacturing steps for additional touch panel layers. This integration significantly reduces manufacturing complexity and cost.
Solution Approach 2:
The LCD panel's existing liquid crystal layer and electrode structures serve dual purposes: maintaining display functionality and providing touch detection capability. The liquid crystal molecules' response to applied pressure naturally generates detectable electrical signals, allowing the display components themselves to perform the touch sensing function without requiring additional specialized materials or manufacturing processes.
3Adaptability or versatility
If traditional multi-layer touch panel structure is used, then touch input is detected, but size and weight increase
Solution Approach 1:
The patent combines the touch sensor mass with the display panel mass into a single integrated structure. By using the LCD panel's existing liquid crystal layer and electrode structures for both display and touch detection, the patent eliminates the need for separate touch panel components that would add additional weight. The integrated design ensures that the weight of the touch detection functionality is already included in the base display panel weight.
Solution Approach 2:
The patent extracts the touch detection function from the separate resistive touch panel structure and integrates it directly into the LCD panel's liquid crystal and electrode layers. This extraction eliminates the need for additional heavy components such as the upper and lower transparent conducting films, dot spacers, and adhesion glue films that would otherwise be required for a separate touch panel assembly.
4Stability of the object's composition
If adhesion glue film is used to connect touch panel and LCD panel, then structural connection is achieved, but optical performance deteriorates
Solution Approach 1:
The patent removes the adhesion glue film layer from the structure by integrating the touch detection function directly into the LCD panel's liquid crystal and electrode layers. This elimination of the glue film removes the optical interference and light scattering effects that would otherwise degrade brightness and contrast, while the liquid crystal layer itself provides the necessary structural connection and touch sensing capability.
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 solution reduces manufacturing costs, eliminates the need for extra touch panels, and improves the accuracy of touch command identification by utilizing the electrical connection between electrodes, resulting in a more efficient and high-quality display device.
Implementation Method 1
a liquid crystal layer 115 between the first electrode 114 and the second electrode 116
Implementation Method 2
The LCD device 100 includes a first substrate 11, a second substrate 21, a first isolating layer 31, a second isolating layer 41, a first electrode 51, a second electrode 61, a third electrode 71, a conductor 81, and a liquid crystal layer 91
Implementation Method 3
a conductor 81 disposed on the first isolating layer 31 at a region corresponding to the gap between the second electrode 61 and the third electrode 71
Implementation Method 4
the second electrode 61 and the third electrode 71, both disposed on the second substrate 21
Data Source
AI summary
A liquid crystal display panel includes a first substrate, a second substrate, a first electrode, a second electrode, a third electrode, an isolating layer, and a conductor. The first electrode is disposed between the first substrate and the isolating layer, on which the conductor is disposed. Each of the second and third electrodes is disposed on the second substrate and includes a contact surface. The second and third electrodes are not in contact with each other and are separated by a gap. The conductor is disposed in accordance with the location of the gap.