Under-Display Sensor Area Layout for Higher Transmittance
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Solution Overview
Problem
Existing display devices face challenges in maintaining display quality while improving the sensitivity of electronic modules disposed within the display area, particularly when anti-reflection members are introduced.
Innovation Solution
The electronic device incorporates a reflection adjusting layer with specific dyes and an inorganic absorption layer to enhance transmittance in the display area overlapping the electronic module, while maintaining display quality by optimizing the layer configurations and materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an anti-reflection member is introduced to improve sensitivity of the electronic module, then the sensitivity is improved, but the display quality deteriorates
Solution Approach 1:
The display area is segmented into a first display area (overlapping the electronic module) and a second display area (not overlapping). The anti-reflection member is selectively disposed only on the first display area, allowing different optical properties in different regions to simultaneously improve sensor sensitivity and maintain display quality.
Solution Approach 2:
The anti-reflection member with specific optical properties (refractive index between 1.3-2.0) is applied locally only to the first display area where the electronic module is located. This localized application ensures improved light transmission for the sensor without affecting the overall display quality across the entire display panel.
2Measurement precision
If the anti-reflection member is disposed on the entire display area, then the sensitivity of the electronic module is improved, but the display quality in the non-overlapping area deteriorates
Solution Approach 1:
The display area is divided into two distinct regions: a first display area overlapping the electronic module and a second display area not overlapping it. The anti-reflection member is selectively applied only to the first display area, ensuring that the optical optimization benefits only the sensor region while the second display area maintains its original display characteristics.
Solution Approach 2:
The anti-reflection member is applied locally to only the first display area where the electronic module is positioned. This selective localization ensures that the transmittance improvement is confined to the sensor region, while the second display area retains its normal optical properties for optimal display quality.
3Illumination intensity
If the refractive index of the anti-reflection member is increased to reduce reflection, then the transmittance is improved, but the color accuracy of the display deteriorates
Solution Approach 1:
The refractive index of the anti-reflection member is precisely controlled within a specific range (1.3 to 2.0). This optimized parameter selection achieves the right balance between reducing reflection (improving transmittance) and maintaining color accuracy, preventing excessive refraction that would distort the displayed colors.
Solution Approach 2:
The anti-reflection member with optimized refractive index is applied only to the first display area overlapping the electronic module. This localized application ensures that the transmittance enhancement is achieved where needed for sensor sensitivity, while the rest of the display area maintains its original color accuracy characteristics.
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
This configuration improves transmittance in the display area overlapping the electronic module, enhancing the sensitivity of the electronic module without compromising display quality.
Implementation Method 1
an inorganic absorption layer disposed on the light emitting element layer
Implementation Method 2
a reflection adjusting layer disposed on the display panel, the reflection adjusting layer may include a dye
Implementation Method 3
a light emitting layer disposed on the hole transport layer
Data Source
AI summary
An electronic device includes an electronic module, a display panel including a first display area overlapping the electronic module in a plan view, a second display area not overlapping the same in a plan view and including a light emitting element layer, an inorganic absorption layer, and an encapsulation layer, and a reflection adjusting layer on the display panel and including a dye. The first display area includes an element area including a pixel electrode, a hole transport layer, a light emitting layer, an electron transport layer, and a common electrode, and a transmissive area adjacent to the element area, including the hole transport layer, the electron transport layer, and a pattern layer, and not including the light emitting layer and the common electrode, and the inorganic absorption layer overlaps the element area in a plan view and does not overlap the transmissive area in a plan view.