Micro-LED Touch Panel Sensing for Small-Block Sensitivity
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Solution Overview
Problem
Micro-LED touch display devices face challenges in maintaining uniform touch performance across areas with varying touch sensing block sizes, particularly in regions with smaller areas, leading to reduced sensitivity and increased noise.
Innovation Solution
The display panel is divided into touch pixel blocks, each equipped with an analog front-end circuit that applies individual touch driving signals, modifying frequency and pulse number to optimize sensing in less-sensitive areas, ensuring temporal separation of display and touch periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional touch panel film is attached onto the display panel, then touch sensing function is provided, but touch performance deteriorates in areas with small touch sensing block size
Solution Approach 1:
The patent applies different touch driving signal configurations to different regions of the display panel. Specifically, edge regions with smaller touch sensing block sizes use differentiated driving parameters compared to central regions, optimizing touch sensitivity locally rather than applying a uniform approach across the entire panel.
2Device complexity
If the same touch driving signal is applied to all touch pixel blocks, then device complexity is reduced, but noise increases and sensitivity decreases in smaller areas
Solution Approach 1:
The patent implements region-specific touch driving signal configurations where edge regions use different signal parameters (such as frequency or pulse width) compared to central regions. This local differentiation reduces noise and improves sensitivity in smaller touch sensing blocks without requiring complete system redesign.
Solution Approach 2:
The display panel is divided into multiple touch pixel blocks that can be independently controlled with different driving signals. This segmentation allows the system to apply optimized driving parameters to specific regions, improving overall touch performance while managing complexity through modular control.
3Ease of manufacture
If touch sensing blocks in smaller areas use the same driving parameters as larger blocks, then manufacturing is simplified, but touch sensitivity deteriorates
Solution Approach 1:
The patent implements region-specific touch driving signal configurations where edge regions use different signal parameters (such as frequency or pulse width) compared to central regions. This local differentiation reduces noise and improves sensitivity in smaller touch sensing blocks without requiring complete system redesign.
Data Source
AI summary
Disclosed is a micro-LED touch display device in which an optimized partial sensing scheme is applied to a less-touch-sensitive area where an area size of a touch sensing block is small. The micro-LED touch display device includes a display panel including a plurality of pixels, each including a micro-LED, and a micro-driver that controls an operation of the plurality of pixels, wherein a display area of the display panel is divided into a plurality of touch pixel blocks, wherein each analog front end circuit is disposed in each of the plurality of touch pixel blocks and is configured to drive each of the plurality of touch pixel blocks, based on an individual touch driving signal.