Peripheral Touch Sensor on Liquid Crystal Substrate
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Solution Overview
Problem
Conventional touch panel integrated display devices face challenges in reducing thickness and weight while maintaining image quality and touch sensing sensitivity, due to the complexity of the manufacturing process and light transmittance issues caused by adhesive layers and auxiliary substrates.
Innovation Solution
A touch panel integrated display device design where the touch panel is directly formed on the peripheral area of the display panel, eliminating the need for an auxiliary substrate, with light sources and sensors arranged along the edges to collect light directly, and a waveguide system connected to sensors to calculate touch coordinates, enhancing sensitivity and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional touch panel attached liquid crystal display device structure is used with adhesive layers and auxiliary substrates, then the touch panel can be attached to the liquid crystal panel, but the overall thickness and weight increase and light transmittance deteriorates
Solution Approach 1:
The patent removes the adhesive layer and auxiliary substrate from the conventional structure. The touch sensor array is directly formed on the liquid crystal panel substrate, extracting out the unnecessary components that caused thickness and weight increase while maintaining the touch sensing function.
Solution Approach 2:
The patent merges the touch sensor array directly with the liquid crystal panel substrate. The touch sensor electrodes are formed on the same substrate as the liquid crystal display, combining two functions into a single integrated structure, eliminating the need for separate attachment layers.
2Reliability
If adhesive layers and auxiliary substrates are used to attach the touch panel, then the touch panel can be bonded to the liquid crystal panel, but light transmittance decreases and image quality deteriorates
Solution Approach 1:
The adhesive layer is completely removed from the structure. The touch sensor array is directly patterned on the liquid crystal panel substrate, extracting out the adhesive layer that blocked light transmission while maintaining the bonding function through direct integration.
Solution Approach 2:
The touch sensor array is positioned in the peripheral area of the liquid crystal panel, leaving the central display area completely clear for optimal light transmission. This local placement strategy maintains image quality while enabling touch sensing functionality.
3Device complexity
If the touch panel is formed on the peripheral area of the display panel, then the overall structure is simplified and thickness is reduced, but the touch sensing area is limited
Solution Approach 1:
The touch sensor array is arranged in a linear fashion along the peripheral edge of the display panel, utilizing the perimeter dimension. This peripheral linear arrangement simplifies the overall structure while providing sufficient touch sensing capability for typical user interactions.
4Measurement precision
If light sources and sensors are arranged along the edges with a waveguide system, then touch sensing sensitivity is improved, but the device complexity increases
Solution Approach 1:
The waveguide utilizes the liquid crystal panel substrate itself as the light guiding medium. The substrate's inherent optical properties are leveraged to guide light from the edge-mounted sensors to the touch interaction points, eliminating the need for separate waveguide components and reducing overall system complexity.
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 the overall thickness and weight of the device, improves touch sensing sensitivity, and enhances image quality by eliminating the need for adhesive layers and auxiliary substrates, simplifying the manufacturing process and increasing light transmittance.
Implementation Method 1
a waveguide comprising a plurality of cores connected with the plurality of the sensors and a cladding formed to surround the plurality of the cores
Data Source
AI summary
A touch panel integrated display device which can reduce an entire thickness and weight and which can prevent display quality deterioration is discussed. The touch panel integrated display device includes a display panel comprising a plurality of pixels, to display an image; a touch panel formed on an top peripheral area of the display panel, to sense a touch generated on the display panel.