Display Pixel Layout With Shielded Sensing Electrode
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Solution Overview
Problem
Existing display devices experience optical phenomena such as resonance and interference that affect display quality and sensing sensitivity due to light emitted by light-emitting elements.
Innovation Solution
A display device design incorporating a base layer, pixel defining layer with specific openings, light-emitting elements, a light detection element, and a sensing electrode that partially shields emission areas to manage light emission and enhance sensing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensing electrode is disposed on the thin film encapsulation layer to enable input sensing, then sensing sensitivity is improved, but optical interference phenomena (resonance and interference) occur that deteriorate display quality
Solution Approach 1:
A light shielding layer is introduced as an intermediary component between the light emitting elements and the sensing electrode. This layer selectively blocks light from reaching the sensing electrode, preventing optical interference while allowing the sensing electrode to maintain its input sensing functionality. The light shielding layer acts as a mediator that resolves the conflict between sensing performance and display quality.
Solution Approach 2:
The sensing electrode is divided into multiple segments with different light transmission characteristics. Some portions of the sensing electrode are designed to be light-shielded while others remain transparent or semi-transparent. This segmentation allows different regions to serve different functions: shielded regions prevent optical interference, while unshielded regions maintain sensing sensitivity.
2Measurement precision
If the sensing electrode completely covers the pixel defining layer to maximize sensing area, then sensing sensitivity is improved, but light emission from light emitting elements is blocked reducing display brightness
Solution Approach 1:
The sensing electrode is designed with spatially varying properties: certain regions have light-shielding characteristics while other regions have light-transmissive characteristics. This local differentiation allows the sensing electrode to simultaneously achieve high sensing sensitivity in shielded regions and maintain display brightness in unshielded regions, resolving the contradiction between sensing area and display brightness.
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 controlling light emission and reception, reducing optical interference effects.
Implementation Method 1
a sensing electrode disposed on the thin film encapsulation layer and overlapping the pixel defining layer... 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
Implementation Method 2
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
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.