Display Device Anti-Reflection Unit Input Sensing Integration
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Solution Overview
Problem
Touch panels in display devices suffer from low touch sensitivity due to operation signals acting as noise sources, which interfere with the input-sensing unit's functionality.
Innovation Solution
A display device design that integrates an input-sensing unit with a sensing electrode directly on an anti-reflection unit, featuring a specific structure with color filters and a light blocking layer to minimize noise interference, including a color spacer and light blocking opening to enhance sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is integrated into the display device, then input functionality is improved, but touch sensitivity deteriorates due to noise from operation signals
Solution Approach 1:
The patent extracts the input-sensing unit from the conventional touch panel structure and relocates it to the anti-reflection unit position. This separation removes the sensing function from the noisy touch panel operation signal environment, thereby extracting the sensing unit from the harmful electromagnetic interference source while maintaining input functionality.
Solution Approach 2:
The anti-reflection unit serves as an intermediary structure that hosts the input-sensing unit. By placing the sensing unit in this intermediate position between the display panel and the external environment, the patent creates a separate sensing zone that is electrically isolated from the touch panel's operation signals, thus mediating between input functionality and noise reduction.
2Object-affected harmful factors
If the input-sensing unit is placed on the anti-reflection unit, then noise interference is reduced, but device structure becomes more complex
Solution Approach 1:
The patent merges the input-sensing unit with the anti-reflection unit by integrating the sensing electrode into the anti-reflection unit's structure. This combination consolidates two functions (anti-reflection and input sensing) into a single integrated component, reducing the need for separate layers and structures while minimizing noise interference.
Solution Approach 2:
The anti-reflection unit is designed to serve multiple functions: it maintains its anti-reflection property while simultaneously housing the input-sensing unit. This multi-functionality allows the same structural element to perform both optical and sensing functions, thereby reducing overall device complexity despite the added sensing capability.
3Measurement precision
If color filters and light blocking layer are added to minimize noise, then sensing accuracy is improved, but manufacturing process becomes more complex
Solution Approach 1:
The color filters and light blocking layer are incorporated into the anti-reflection unit structure during the anti-reflection unit's fabrication process. By performing the sensing unit integration and optical layer addition as preliminary actions during the existing manufacturing sequence, the patent avoids requiring separate, complex post-processing steps for adding these noise-minimizing components.
Data Source
AI summary
A display device includes a display panel and an anti-reflection unit directly disposed on the display panel. The display panel includes first to third light emitting elements, each of which includes first and second electrodes, and a light emitting layer, which is disposed between the first electrode and the second electrode. The pixel definition layer includes a first portion, in which a light-emitting opening exposing the first electrode is defined, and a second portion, which is disposed on and overlapped with the first portion. The anti-reflection unit includes first to third color filters overlapped with the first to third light emitting elements, respectively, and a color spacer, which is overlapped with the second portion and is thicker than each of the first to third color filters.