Display Device Touch Detection Layer Merging
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Solution Overview
Problem
Touch detection devices with integrated capacitance sensors face challenges in reducing thickness due to the addition of detection electrodes, leading to lower detection accuracy on the surface opposite to the display surface, as they include multiple laminated layers and switching elements.
Innovation Solution
A display device configuration with a substrate having pixel electrodes and switching elements on one surface, and a first electrode with lower light transmittance than the substrate on the same side, facing the switching element, which enables touch detection using mutual capacitance and self-capacitance methods while maintaining thinness by reducing the number of laminated layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If detection electrodes are added to implement multiple functions, then the touch detection function is improved, but the number of laminated layers increases making it difficult to reduce the thickness of the display device
Solution Approach 1:
The first electrode is integrated into the same layer as the switching element rather than being placed in a separate laminated layer. This merging of the detection electrode with the switching element layer eliminates the need for additional laminated layers, thereby maintaining the touch detection function while preventing an increase in overall device thickness.
Solution Approach 2:
The first electrode serves dual purposes: it functions as both a switching element control component and a touch detection electrode. By making the electrode multi-functional, the patent avoids the need for separate dedicated detection electrodes that would require additional layers, thus resolving the thickness issue while maintaining versatility.
2Adaptability or versatility
If multiple laminated layers are added for touch detection, then the touch detection function is improved, but the detection accuracy on the surface opposite to the display surface deteriorates
Solution Approach 1:
By merging the first electrode with the switching element layer, the patent reduces the total number of laminated layers. This reduction in layer count minimizes the distance and interference between layers, thereby improving the detection accuracy on the opposite surface while still enabling the touch detection function.
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 solution enhances touch detection accuracy and maintains a slim form factor by integrating touch detection functionality within the display device without increasing the number of layers, allowing for precise detection of touch inputs and force applied to the surface.
Implementation Method 1
Display devices provided with a capacitance touch sensor are known as a type of display device with a touch detection function
Data Source
AI summary
A display device includes a substrate, a plurality of pixel electrodes, a switching element, and a first electrode. The substrate has a first surface and a second surface opposite to the first surface. The pixel electrodes are provided to the first surface side and supplied with a pixel signal for displaying an image. The switching element is provided to the first surface side and coupled to the pixel electrodes. The first electrode is provided to a layer closer to the first surface than the switching element in a manner facing the switching element in a direction perpendicular to the first surface of the substrate and having lower light transmittance than that of the substrate.