Display Pixel Code Patterns for Accurate Electronic Pen Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in accurately detecting touch inputs, particularly from electronic pens, due to limitations in sensing technology and the need for improved position coordinate detection methods.
Innovation Solution
A display device with a combination of display pixels and light sensing pixels arranged in a preset code pattern shape, incorporating a color filter layer, to enhance position input detection using a position input device like an electronic pen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a touch input sensor is used to detect touch inputs from electronic pens, then the detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The display pixels and light sensing pixels are configured to detect both touch inputs from electronic pens and reflected light for position detection. The code patterns formed by these pixels serve dual purposes: enabling touch sensing and providing optical reference markers for position input device detection, thereby reducing overall system complexity.
Solution Approach 2:
The patent combines the touch sensing function and the optical code detection function into a single integrated pixel structure. The display pixels and light sensing pixels work together to provide both touch input detection and position coordinate detection, eliminating the need for separate sensing systems.
2Measurement precision
If code patterns are formed using display pixels and light sensing pixels, then position coordinate detection is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The display panel is divided into multiple code pattern placement areas, each containing unit pixels arranged in specific code pattern shapes. This segmentation allows for modular manufacturing and simplifies the precision requirements by breaking down the overall pattern into repeatable units that can be produced through standard fabrication processes.
Solution Approach 2:
The patent utilizes different sizes of light sensing units within the light sensing pixels to create distinguishable code patterns. By varying the size parameter of the light sensing units rather than relying solely on precise positional arrangements, the system achieves position detection while accommodating manufacturing tolerances.
3Reliability
If light sensing pixels with different sized light sensing units are used, then light reception sensitivity is improved, but the device complexity increases
Solution Approach 1:
Different regions of the display panel contain code patterns with different light sensing unit sizes tailored to their specific detection requirements. This local differentiation allows each code pattern to be optimized for its position detection function while using the same basic pixel structure throughout the device, avoiding the need for complex varied architectures.
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 enables precise and accurate detection of touch positions, improving the sensitivity and accuracy of input recognition, especially with electronic pens, by utilizing differently sized light sensing units and color filters to optimize light reception and processing.
Implementation Method 1
light sensing pixels that are disposed in a preset code pattern shape in an image display area
Implementation Method 2
a color filter layer disposed on the display pixels and the light sensing pixels
Data Source
AI summary
A display device includes: a display unit including display pixels and light sensing pixels that are disposed in a preset code pattern shape in an image display area; a touch sensing unit formed on the display unit and configured to detect a touch position of a user; and a color filter layer disposed on the display pixels and the light sensing pixels, wherein the display pixels and the light sensing pixels are disposed in combination with each other in the preset code pattern shape to form code patterns for detecting position coordinates of a position input device.