Display Device Touch Input via Infrared Code Patterns
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Solution Overview
Problem
Current display devices with touch input systems face challenges in accurately sensing touch inputs without complex computations or corrections, particularly when using a user's body for input, and require costly and power-intensive processes.
Innovation Solution
A display device with a touch input system that utilizes a light shielding pattern and color filters with infrared absorbing pigments in light emission areas to create code patterns, allowing for accurate touch input detection using a touch input device that includes a code detector and processor to generate coordinate data without complex computations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional touch sensing methods are used with user's body input, then touch input functionality is provided, but sensing accuracy is insufficient and requires complex computations and corrections
Solution Approach 1:
The patent applies color filters with different infrared absorption characteristics to create distinguishable code patterns on the display panel. The color filters transmit different amounts of infrared light, creating optical codes that can be directly detected by the touch input device, eliminating the need for complex computation and correction algorithms while significantly improving sensing accuracy
Solution Approach 2:
The patent introduces color filters as an intermediary element between the touch input device and the display content. These filters act as a mediator that encodes position information optically, allowing the touch input device to directly read position codes without requiring complex signal processing or correction computations
2Measurement precision
If complex computation and correction processes are implemented for touch input, then sensing accuracy may be improved, but power consumption increases
Solution Approach 1:
The patent replaces the computational processing system with an optical encoding system. Instead of using complex algorithms and computations to determine touch position, the system uses optically encoded position codes created by color filters with different infrared absorption properties, allowing direct optical reading of position information and dramatically reducing power consumption
3Measurement precision
If additional touch sensing components are added to improve accuracy, then touch input precision increases, but manufacturing cost increases
Solution Approach 1:
The patent makes the color filters serve dual functions: displaying visual content and encoding touch position information. By using the existing color filter layer for both purposes, the system achieves accurate touch sensing without adding separate sensing components, thereby avoiding increased manufacturing costs
Solution Approach 2:
The patent merges the display function and touch sensing function into a single integrated system. The color filters are used simultaneously for visual display and for creating optical position codes, combining multiple functions into existing components and eliminating the need for additional separate components that would increase manufacturing cost
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 precise and cost-effective touch input functionality by simplifying the manufacturing process and reducing power consumption, while enhancing the recognition accuracy of touch inputs.
Implementation Method 1
color filters selected from among first to third colors or color filters selected from among first to fourth colors are alternately disposed in the plurality of light emission areas, wherein the color filters from among any one of the first to third colors or the first to fourth colors are used as code patterns by including an infrared absorbing pigment
Implementation Method 2
at least one light shielding pattern formed by covering a portion or all of a front surface of at least one of the plurality of touch electrodes
Data Source
AI summary
A display device and a touch input system are provided, the display device comprising a display unit including a plurality of light emission areas; a plurality of touch electrodes disposed between the plurality of light emission areas to sense a touch input; at least one light shielding pattern formed by covering at least a portion of a front surface of at least one of the plurality of touch electrodes; and one of a first set of color filters comprising first to third colors or a second set of color filters comprising first to fourth colors, which are alternately disposed in the plurality of light emission areas, wherein the color filters of one of the first or second set of color filters are used as code patterns by including an infrared absorbing pigment.