Display Panel Position Code Layout for Precise Pen Input
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Solution Overview
Problem
Current display devices lack an efficient method to integrate position code patterns for precise position input without additional processes or costs during the formation of pixel electrodes, limiting their ability to accurately detect position coordinates using electronic pens.
Innovation Solution
Incorporating position code patterns formed in a planar code shape between subpixels on a display panel, using the same material as pixel electrodes, which are electrically floating and covered by a pixel-defining layer, allowing for accurate detection of position coordinates through reflected light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If position code patterns are integrated into the display panel structure, then position coordinate detection precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the position code patterns with the pixel electrode patterns, forming both structures simultaneously during the same manufacturing process. This integration eliminates the need for separate position code pattern fabrication steps, thereby improving position coordinate detection precision without significantly increasing manufacturing complexity
Solution Approach 2:
The pixel electrode patterns serve dual functions: as electrical conductors for the display function and as position code patterns for position input detection. This multi-functionality allows the display panel to provide both display and precise position detection capabilities using the same structural elements, avoiding additional manufacturing steps
2Ease of manufacture
If position code patterns are formed using the same material as pixel electrodes, then manufacturing cost is reduced, but position code pattern detectability may be affected
Solution Approach 1:
The patent applies local quality by forming position code patterns with different geometrical characteristics (such as line widths, shapes, or arrangements) in specific regions compared to the pixel electrode patterns. This local differentiation in geometric properties enables the position code patterns to be distinguished by the position input device while maintaining the same material composition, thus reducing manufacturing cost without compromising detectability
3Measurement precision
If position code patterns are disposed between adjacent subpixels, then position input accuracy is improved, but device structure complexity increases
Solution Approach 1:
The patent utilizes the spatial dimension between adjacent subpixels to embed position code patterns, effectively using the existing pixel matrix structure as a reference framework. By positioning code patterns in the interstitial regions rather than adding separate layers or structures, the system achieves high position input accuracy while minimizing structural complexity
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 position input by generating position coordinate data without additional steps or costs, enhancing the accuracy and efficiency of position input systems in display devices.
Implementation Method 1
The plurality of position code patterns are formed in a planar code shape and are configured to reflect light incident through the pixel-defining layer
Data Source
AI summary
A display device includes subpixels on a substrate, position code patterns having a predetermined position code shape, when viewed in a plan view, each position code pattern being disposed at a region between at least two adjacent subpixels, and a pixel-defining layer defining a region where each subpixel is disposed and covering the position code patterns. The plurality of position code patterns are formed in a planar code shape and are configured to reflect light incident through the pixel-defining layer.