Color Filter and Photoactive Layer Layout for Pen Touch Displays
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Solution Overview
Problem
Existing display devices struggle to accurately sense pen touches while maintaining light emitting performance for image display, leading to potential thickness and assembly complexity issues.
Innovation Solution
Integrate a display panel with a light control structure that includes color filters and a photoactive layer, allowing pen touch sensing through distinct wavelength bands for optical pen touch detection without affecting image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate optical sensing layer is added to enable pen touch detection, then pen touch sensing capability is improved, but device thickness and assembly complexity increase
Solution Approach 1:
The color filter layer is designed to serve dual functions: its primary function for image display and its secondary function for optical pen touch sensing. By making the color filter layer universal, the patent eliminates the need for a separate optical sensing layer, thereby improving adaptability while avoiding increased device complexity
Solution Approach 2:
The patent merges the optical sensing function with the existing color filter layer structure. The photoactive layer is integrated into the color filter layer, combining what would traditionally be separate components into a unified structure, thus enabling pen touch sensing without adding thickness or assembly complexity
2Adaptability or versatility
If a separate optical sensing layer is added to enable pen touch detection, then pen touch sensing capability is improved, but device thickness increases
Solution Approach 1:
The color filter layer is designed to serve dual functions: its primary function for image display and its secondary function for optical pen touch sensing. By making the color filter layer universal, the patent eliminates the need for a separate optical sensing layer, thereby improving adaptability while avoiding increased device complexity
Solution Approach 2:
The patent merges the optical sensing function with the existing color filter layer structure. The photoactive layer is integrated into the color filter layer, combining what would traditionally be separate components into a unified structure, thus enabling pen touch sensing without adding thickness or assembly complexity
3Measurement precision
If the photoactive layer is made fully transparent for optimal pen touch sensing, then sensing accuracy is improved, but light emitting performance for image display deteriorates
Solution Approach 1:
The photoactive layer is designed with wavelength-selective properties, being responsive only to specific wavelengths (e.g., infrared) while being transparent to other wavelengths used for image display. This local quality differentiation allows the layer to provide accurate pen touch sensing for its target wavelength without compromising the light emitting performance for visible image display
Solution Approach 2:
The patent utilizes wavelength-selective absorption and transmission characteristics of the photoactive layer. The layer is designed to absorb or respond to specific wavelengths for pen touch sensing while maintaining transparency to other wavelengths, effectively using color/wavelength selectivity to resolve the contradiction between sensing accuracy and display performance
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
Enables accurate pen touch sensing with reduced device thickness and simplified assembly by using color filters and a photoactive layer to differentiate between image display and touch detection wavelengths.
Implementation Method 1
The photoactive layer may reflect the light having the second wavelength
Implementation Method 2
convert the light having the second wavelength into light having one or more other wavelengths and radiate the light having the one or more other wavelengths
Implementation Method 3
Each of the plurality of second color filters may absorb the light having the second wavelength
Data Source
AI summary
A display device is disclosed that includes a first substrate, a plurality of first color filters included in a color filter layer and transmitting first color light having a first color wavelength included in a first wavelength band, a plurality of second color filters included in the color filter layer and transmitting second color light having a second color wavelength included in the first wavelength band, a plurality of third color filters included in the color filter layer and transmitting third color light having a third color wavelength included in the first wavelength band, and a photoactive layer responsive to light having a second wavelength included in a second wavelength band different from the first wavelength band and including two or more openings overlapping with two or more second color filters among the plurality of second color filters.