Display Touch Code Pattern Spacing to Reduce Ghost Reflections
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Solution Overview
Problem
The ghost phenomenon occurs when code patterns on a display panel are superimposed with their reflections, causing mistaken recognition of position inputs.
Innovation Solution
A display device with a code arrangement unit that includes code patterns, a reflective layer, and a transparent insulating layer, where the distance between the patterns and the reflective surface is less than 55% of the pattern width, minimizing ghost reflections and improving input accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If code patterns are formed on the display panel for position input detection, then position input accuracy is improved, but ghost phenomenon occurs causing mistaken recognition
Solution Approach 1:
A transparent insulating layer is introduced as an intermediary between the code patterns and the reflective layer. This intermediate layer controls the distance between patterns and reflective surface to be 55% or less of the pattern width, preventing direct superposition of code patterns and their reflections while maintaining touch detection accuracy.
Solution Approach 2:
The distance parameter between code patterns and reflective surface is precisely controlled to be 55% or less of the pattern width. This parameter change eliminates the ghost phenomenon by ensuring that reflected light does not superpose on the original code patterns, thereby resolving the contradiction between position detection accuracy and recognition reliability.
2Reliability
If the distance between code patterns and reflective surface is reduced to minimize ghost reflections, then input recognition accuracy is improved, but light transmission may be affected
Solution Approach 1:
The distance parameter is optimized to 55% or less of the pattern width, which is sufficient to prevent ghost reflections while maintaining adequate light transmission. This parameter setting balances both requirements by creating minimal separation that eliminates superposition effects without significantly blocking light paths.
Solution Approach 2:
The transparent insulating layer provides localized optical properties that allow light transmission while maintaining the required distance constraint. The layer's transparency ensures light can pass through while its thickness controls the distance parameter to prevent ghost phenomenon in the critical region between code patterns and reflective surface.
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 configuration allows for quick and accurate generation of touch coordinate data without complex calculations, reducing ghost phenomena and enhancing input reliability.
Implementation Method 1
a reflective layer constituting the reflective surface and configured to reflect light applied from above the reflective layer
Implementation Method 2
a transparent insulating layer disposed on the reflective layer and configured to transmit light applied from above the transparent insulating layer and light reflected from the reflective layer therethrough
Data Source
AI summary
A display device including: a display unit including a plurality of sub-pixels; a touch sensing unit formed on the display unit and configured to sense a touch position; a code arrangement unit disposed on the touch sensing unit, wherein the code arrangement unit includes code patterns; and a surface protection cover disposed on the code arrangement unit, wherein a distance between the code patterns and a reflective surface formed below the code patterns is equal to or less than 55% of one width of one of the code patterns.