Optically Readable Position Marks for Display Handwriting Input
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Solution Overview
Problem
Existing display devices that enable handwriting input on a display surface face challenges in minimizing the influence of position information patterns on image visibility, leading to potential color moire phenomena and reduced handwriting input accuracy.
Innovation Solution
A display device with a display panel featuring a matrix arrangement of sub-pixels of different colors and optically readable position information patterns formed from materials that transmit visible light, where the position information patterns are designed to minimize interference by optimizing the alignment and arrangement of marks relative to the sub-pixels, adhering to specific relational expressions for their length and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If position information patterns are arranged on the display area to enable handwriting input detection, then handwriting input functionality is improved, but image visibility deteriorates due to color moire phenomena
Solution Approach 1:
The patent applies local quality by making the position information patterns locally transparent (using materials that transmit visible light) rather than uniformly opaque, allowing the display image to show through the pattern regions and reducing moire effects while maintaining input detection capability
Solution Approach 2:
The patent uses color matching between the position information pattern marks and the display background (both made transparent or matching in color) to reduce visual contrast and moire phenomena, while still maintaining sufficient contrast for the sensor to detect handwriting input
2Measurement precision
If position information patterns with high contrast are used to improve detection accuracy, then handwriting input accuracy is improved, but image visibility deteriorates due to increased moire phenomena
Solution Approach 1:
The patent changes the optical parameters of the position information pattern material from opaque to transparent/translucent, and adjusts the color parameters to match the display background, thereby reducing moire effects while maintaining detection accuracy through sensor-based detection rather than visual contrast
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 effectively reduces the impact of position information patterns on image visibility, suppressing color moire phenomena and enabling high-fidelity handwriting input by ensuring marks are optimally positioned between sub-pixels, thereby enhancing the overall display control system's performance.
Implementation Method 1
Each position information pattern is formed of a plurality of optically readable marks that are formed from a material that transmits visible light
Data Source
AI summary
A display device 2 includes: a display panel 50 having a display area; and a plurality of position information patterns 3 arranged on the display area and each representing information regarding a position thereof on the display area. Each position information pattern 3 is formed of a plurality of optically readable marks 31 that are formed from a material that transmits visible light. On the display area, a plurality of sub-pixels 5R, 5G, and 5B whose colors are different from each other are repeatedly aligned in a determined alignment direction. A length L between both ends of the mark 31 in the alignment direction meets a relational expression of n×P+w≦L≦(n+1)×P−w (n is an integer of 0 or greater) where a width of the sub-pixel in the alignment direction is w and a pitch between the pixels 5 in the alignment direction is P.