AMOLED Display Transmit Region Light-Blocking Layers
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Solution Overview
Problem
Existing mobile device displays face challenges in imaging through the display due to severe degradation caused by circuit elements, which compete for space and interfere with light transmission.
Innovation Solution
The implementation of an active matrix organic light emitting diode (AMOLED) display with a transmit/receive region that includes a first and second light-blocking layer. The first light-blocking layer has a pattern of opaque portions aligned with circuit elements to prevent light from reaching them, while the second light-blocking layer, located between the first layer and the camera, further blocks diffracted light from reaching the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If electro-optical devices are positioned behind the display to maximize display area, then display area is improved, but imaging quality through the display is degraded due to circuit elements blocking and diffracting light
Solution Approach 1:
The display is divided into two distinct regions: a high-resolution display region with dense pixel arrangement and a transmit/receive region with lower pixel density and reduced circuit elements. This segmentation allows the camera to access light paths through a dedicated zone with minimal optical interference while maintaining high display quality in the main region.
Solution Approach 2:
The transmit/receive region is designed with locally optimized characteristics: lower pixel density, reduced circuit element density, and modified electrode patterns. These local quality changes enable improved light transmission for imaging while the rest of the display maintains its high-resolution properties.
2Adaptability or versatility
If circuit elements are positioned in the transmit/receive region to enable display functionality, then display control is improved, but light transmission is blocked and diffracted
Solution Approach 1:
Circuit elements are extracted or removed from the transmit/receive region compared to the main display area. The region contains only essential circuit elements for display control, with many components omitted to minimize light interference. This extraction approach reduces diffraction and blocking while maintaining necessary display functionality.
Solution Approach 2:
Instead of optimizing the transmit/receive region for circuit density like the main display, the design inverts the approach by prioritizing optical clarity. The region is designed with fewer circuit elements and modified electrode patterns to facilitate light transmission, sacrificing some display control capability for improved imaging performance.
3Object-affected harmful factors
If opaque portions are added to block light from reaching circuit elements, then diffraction is reduced, but device complexity increases
Solution Approach 1:
The light-blocking function is merged with existing display components. The first light-blocking layer is integrated with the lower electrode pattern, and the second light-blocking layer is combined with the upper electrode pattern. This merging approach reduces diffraction without adding separate, independent blocking structures, thereby limiting the increase in device complexity.
Solution Approach 2:
The electrode patterns serve dual functions: they provide electrical control for display operation and simultaneously act as light-blocking elements to prevent diffraction. This multi-functionality reduces the need for additional dedicated light-blocking components, maintaining device simplicity while addressing the diffraction problem.
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 solution effectively reduces diffraction and enhances image quality by allowing light to pass through the display without significant distortion, thereby improving the camera's ability to capture clear images.
Implementation Method 1
The first light-blocking layer includes a first pattern of opaque portions that are positioned above, and aligned with, the circuit elements to prevent light transmitted into the transmit/receive region from reaching the circuit elements
Implementation Method 2
The second light-blocking layer is located between the first light blocking layer and the camera and includes a second pattern of opaque portions that is aligned with the first pattern, such that at least a portion of light transmitted into the transmit/receive region and diffracted by the first pattern of opaque portions is blocked by the second pattern of opaque portions from reaching the sensor of the camera
Implementation Method 3
The transmit/receive region has a pixel density that is lower than other regions of the light-emitting area and that includes circuit elements arranged such that they diffract visible light that passes through the transmit/receive region
Data Source
AI summary
A display configuration to facilitate imaging through the display is disclosed. The imaging can be achieved by positioning a camera behind a transmit/receive area (120,122) of a display. The transmit/receive area is configured to reduce the interaction between the light propagating through the display and circuit elements of the display. The configuration of the transmit/receive area can be characterized by reduced pixel density, rearranged circuit elements (1242), and as light blocking layer (1222, 1260) to prevent light from diffracting from gaps formed by circuit elements (1242).