Touch Sensor Display Stack With Light-Absorbing Insulating Layer
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Solution Overview
Problem
Existing display devices require multiple manufacturing operations to incorporate both a display panel and a touch sensor, increasing production costs and complexity.
Innovation Solution
A display device is designed with a touch sensor that integrates a functional insulating layer acting as a color filter or reflection control layer, absorbing light in non-emission wavelength bands, thereby reducing the number of manufacturing steps and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate manufacturing processes are used for display panel and touch sensor, then manufacturing precision and reliability are maintained, but device complexity and production cost increase
Solution Approach 1:
The patent combines the display panel and touch sensor into a single integrated structure where the touch sensor is formed directly on the display panel. The functional insulating layer serves dual purposes as both an insulating layer for the touch sensor and a color filter or reflection control layer for the display panel, merging multiple manufacturing operations into one unified process.
Solution Approach 2:
The functional insulating layer is designed to perform multiple functions simultaneously: it acts as an insulating layer for the touch sensor electrodes, a color filter for the display panel, and a reflection control layer. This multi-functionality eliminates the need for separate color filter and reflection control layers, reducing manufacturing complexity.
2Ease of manufacture
If functional insulating layer is integrated to serve as color filter and reflection control layer, then manufacturing cost is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent adjusts the optical properties of the functional insulating layer by changing its material composition and thickness parameters. By selecting appropriate materials with specific refractive indices and absorption characteristics, and by controlling the layer thickness within specific ranges, the layer achieves both color filtering and reflection control functions while maintaining manufacturability.
3Illumination intensity
If functional insulating layer absorbs non-emission wavelength light, then display quality is improved, but light transmission in emission bands must be preserved
Solution Approach 1:
The functional insulating layer is designed with spatially varying properties where different regions or thicknesses provide different optical functions. The layer selectively absorbs light in non-emission wavelength bands while maintaining high transmission in the emission wavelength bands through careful material selection and thickness control, achieving local optimization of optical properties.
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 integration simplifies the manufacturing process, reduces costs, and enhances display quality by minimizing external light reflectance and improving visibility.
Implementation Method 1
The functional insulating layer may absorb light in a non-emission wavelength band different from a wavelength band of the light emitted from the emission layer
Data Source
AI summary
A display device comprises a display part and a sensor part. The display part includes an emission layer emitting light, and the sensor part is disposed on the display part. The sensor part includes a first conductive pattern layer, a second conductive pattern layer, and a functional insulating layer disposed between the first conductive pattern layer and the second conductive pattern layer. The functional insulating layer absorbs light in a non-emission wavelength band different from a wavelength band of the light emitted from the emission layer.