Display Pixel Layout With Sensing Electrode Light Shielding
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Solution Overview
Problem
Display devices experience optical phenomena such as resonance and interference that affect image quality due to light emitted by light-emitting elements, which compromises display quality and sensing sensitivity of light detection elements.
Innovation Solution
A display device design incorporating a base layer, pixel defining layer with specific openings, light-emitting and light-receiving elements, and a sensing electrode that partially shields emission areas to manage light emission and enhance sensing sensitivity, with precise distances and shapes to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensing electrode is added to detect light, then sensing sensitivity is improved, but light interference and display quality degradation occur
Solution Approach 1:
A shielding electrode is introduced as an intermediary element between the light emitting element and the sensing electrode. This shielding electrode selectively blocks harmful light interference from reaching the sensing electrode while allowing the sensing electrode to maintain its light detection capability for touch sensing operations.
Solution Approach 2:
The shielding electrode is positioned to provide localized shielding only in regions where light interference occurs, rather than blocking all light uniformly. This allows different regions of the display to have different optical properties - some areas shielded from light interference while others maintain full light transmission for display quality.
2Measurement precision
If the sensing electrode area is increased to improve detection, then sensing sensitivity is improved, but more light interference is caused
Solution Approach 1:
The sensing electrode structure is segmented into multiple regions with different functions. Some regions are designed to be shielded from light to prevent interference, while other regions remain unshielded to maintain sensing sensitivity. This segmentation allows the sensing electrode to achieve both high sensitivity and low light interference simultaneously.
Solution Approach 2:
The shielding electrode acts as a mediator that selectively blocks light from reaching specific portions of the sensing electrode. This allows the sensing electrode to have a larger overall area for improved sensitivity while the shielding electrode prevents light interference from affecting the detection accuracy.
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 design improves display quality and maintains high sensing sensitivity by mitigating optical interference, ensuring optimal image presentation and input detection.
Implementation Method 1
a light detection element including a fourth electrode, wherein the light detection element is exposed by the light-receiving opening and a light detection area corresponds to the light-receiving opening
Implementation Method 2
the sensing electrode partially shields each of two emission areas among the first color emission area, the second color emission area, and the third color emission area
Data Source
AI summary
A display device including: a first light-emitting opening, a second light-emitting opening, a third light-emitting opening, and a light-receiving opening; wherein a first color emission area corresponds to the first light-emitting opening; a second color emission area corresponds to the second light-emitting opening; a third color emission area corresponds to the third light-emitting opening; and a light detection area corresponds to the light-receiving opening; and when the first color emission area, the second color emission area, and the third color emission area are viewed at a first point having a first viewing angle with respect to a normal line of a base layer, a sensing electrode shields each of two emission areas among the first color emission area, the second color emission area, and the third color emission area or one of the first color emission area, the second color emission area, and the third color emission area.