Touch Electrode Width Variation for Position Code Masking

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Solution Overview

Problem

Existing display devices with touch input systems face challenges in reducing computational cost and enhancing display quality due to the visibility of position code patterns and the complexity of accurately determining touch input positions.

Innovation Solution

A display device with a position input system that uses position code patterns on a display panel, where touch electrodes with increased width in the position code pattern forming regions overlap the code patterns, reducing visibility and computational complexity, and generating position coordinate data efficiently.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If position code patterns are formed on the display panel for accurate position detection, then measurement precision is improved, but the patterns become visible which reduces display quality

Engineering Contradiction:

Improveposition detection accuracyVSAvoidvisibility of position code patterns

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent merges the position code patterns with the touch electrode structures by forming the patterns directly on the touch electrodes. This integration allows the patterns to serve dual purposes: enabling position detection while being obscured by the electrode material itself, thereby reducing visibility issues

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies different properties to different regions by making the touch electrodes wider specifically in the regions where position code patterns are formed. This local modification allows the electrodes to effectively mask the patterns in those specific areas while maintaining normal electrode functionality elsewhere

Inventive Principle:

Principle #3Local quality

2Measurement precision

If traditional touch input methods are used for accurate position detection, then measurement precision is improved, but computational cost increases

Engineering Contradiction:

Improvetouch input position accuracyVSAvoidcomputation and correction complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent performs preliminary action by pre-forming position code patterns with specific shapes and locations on the display panel before touch input occurs. These pre-defined patterns enable the position input device to directly determine coordinates by detecting which patterns are visible, eliminating the need for complex real-time computation and correction algorithms

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12008187B2Display device and position input system including the same

Publication Date: 2024.06.11 SAMSUNG DISPLAY CO LTD

AI summary

The present disclosure relates to a display device and a position input system including the same. According to an embodiment of the disclosure, a display device includes a display panel, a display unit disposed on the display panel and comprising a plurality of emission areas, a plurality of touch electrodes disposed between the plurality of emission areas and configured to sense a touch input, and a plurality of position code patterns. Each of the plurality of position code patterns is disposed to overlap a corresponding touch electrode in a position code pattern forming region. A width in a horizontal direction of the touch electrodes formed in the position code pattern forming regions is greater than a width in the horizontal direction of the position code patterns overlapping on a front surface thereof. The horizontal direction is parallel to an extending plane of the display panel.