Rear-Mounted Optical Sensor in Display Panel
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Solution Overview
Problem
Display devices face challenges in incorporating optical electronic devices, such as cameras and sensors, which require increased bezel size or notches, leading to reduced image quality and design limitations due to the need for light reception and detection.
Innovation Solution
A display panel design with a light transmission structure that includes an optical area for light reception and a normal area for pixel circuits, using anode extension lines and light path changing elements to improve transmittance and prevent voltage drops, allowing optical devices to be integrated without exposing them on the front surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an optical electronic device is located in a front portion of the display device to receive incident light, then the light reception capability is improved, but the bezel area increases or a notch/hole must be formed in the display area
Solution Approach 1:
The patent moves the optical electronic device from the front surface (2D plane) to the rear surface of the display device, utilizing the third dimension (depth) to resolve the contradiction. This allows light to pass through the display panel from the front to reach the optical device at the rear, eliminating the need for increased bezel area or notches while maintaining light reception capability
Solution Approach 2:
The display panel itself acts as an intermediary medium, allowing light to transmit through it to reach the optical electronic device positioned at the rear. This intermediary structure enables the optical device to receive light without being exposed on the front surface, thus avoiding bezel expansion or display area compromise
2Illumination intensity
If an optical electronic device is located in a front portion of the display device to receive incident light, then the light reception capability is improved, but the image quality decreases
Solution Approach 1:
By positioning the optical electronic device at the rear surface rather than the front surface, the patent eliminates interference with the display area. This dimensional relocation allows the optical device to receive light through the panel without creating notches or holes that would degrade image quality and visual continuity
3Device complexity
If pixel circuits are arranged in the optical area to drive light emitting elements, then the device complexity is reduced, but the light transmittance decreases
Solution Approach 1:
The patent divides the display area into distinct optical areas and normal areas. Pixel circuits are selectively arranged only in normal areas, while optical areas are kept free of circuits to maximize light transmittance. This segmentation allows the system to maintain functionality while optimizing light transmission in critical regions
Solution Approach 2:
The patent extracts pixel circuits from the optical area and relocates them to normal areas. This extraction removes the obstruction to light transmission in the optical area while maintaining the necessary circuit functionality in appropriate locations, thus preserving light transmittance
4Area of stationary object
If a light transmission structure is implemented to enable optical devices to receive light without front surface exposure, then the bezel size is reduced, but voltage drop may occur in cathode electrodes
Solution Approach 1:
The patent introduces a cathode electrode as an intermediary conductive element that extends into the optical area to provide electrical connection. This intermediary structure enables voltage supply to light emitting elements in the optical area while maintaining electrical stability, thus preventing voltage drop despite the extended configuration required by the light transmission structure
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 design enhances light transmittance, maintains image quality, and reduces bezel size, enabling more flexible design options while allowing optical devices to function effectively without compromising image display.
Implementation Method 1
a light path changing element disposed on a portion of an upper surface of the insulating layer and at least one side surface of the concave portion
Data Source
AI summary
The present disclosure relates to a display panel and a display device, and more specifically, to a display panel and a display device that include: a first optical area allowing light to be transmitted; and a normal area included in a display area and located outside of the first optical area, the first optical area comprising: a first anode electrode of a first light emitting element; a first insulating layer including a concave portion exposing at least a portion of an upper surface of the first anode electrode; a light path changing element disposed on a portion of an upper surface of the insulating layer and a side surface of the concave portion; and a bank exposing a portion of the light path changing element disposed on the upper surface of the insulating layer and exposing a portion of the upper surface of the first anode electrode, and are capable of improving light extraction efficiency.