Under-Display Optical Substrate for High Transmittance
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Solution Overview
Problem
Display devices face challenges in achieving high transmittance and heat resistance while integrating optical electronic devices like cameras and sensors under the display area, without increasing the non-display area or causing process defects.
Innovation Solution
A display panel structure with a first optical area and a non-optical area, where the optical electronic device is located under the display area, utilizing a third substrate with higher transmittance than the first and second substrates, and a bonding layer to enhance light transmission and heat resistance, allowing the optical electronic device to receive light and perform functions without being exposed on the front surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the optical electronic device is located in the front portion of the display device to be exposed to incident light, then the light receiving function is improved, but the display area is reduced due to increased bezel or notch/hole formation
Solution Approach 1:
The patent inverts the conventional location of the optical electronic device from the front surface to the rear surface of the display panel. The optical electronic device is positioned in the non-display area at the rear, and light is transmitted through the display panel from front to back to reach the device, thereby eliminating the need for front surface openings while maintaining light receiving functionality
Solution Approach 2:
The patent moves the optical electronic device from the two-dimensional front surface to the three-dimensional rear volume of the display panel. By utilizing the depth dimension and positioning the device in the non-display area at the rear, the solution maintains full display area while providing light receiving capability through transmitted light
2Use of energy by moving object
If a substrate with high transmittance is used in the optical area to enable light transmission to the optical electronic device, then the light transmission is improved, but the heat resistance is reduced causing process defects
Solution Approach 1:
The patent applies different substrate materials with different properties to different functional areas. The third substrate in the optical area is designed with high transmittance for light transmission, while the first and second substrates in non-optical areas use materials with appropriate heat resistance. This local differentiation allows each area to optimize for its specific function
Solution Approach 2:
The patent employs a composite substrate structure consisting of multiple substrates with different material properties. The combination of first substrate, second substrate, and third substrate creates a composite structure where each layer contributes its advantageous properties - the third substrate provides high transmittance in the optical area while the overall composite structure maintains adequate heat resistance through the other substrate layers
3Area of stationary object
If the optical electronic device is disposed under the display area to reduce non-display area, then the display area is increased, but the light transmission structure becomes more complex
Solution Approach 1:
The patent divides the display panel into distinct functional areas: display area and non-display area, and further segments the substrate structure into first substrate, second substrate, and third substrate. The optical area is specifically defined within the display area to overlap with the optical electronic device. This segmentation allows for optimized light transmission paths and simplified structural design in each segment
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 solution enables high transmittance and heat resistance in the optical electronic device area, reducing the non-display area and preventing process defects, while allowing normal display driving and functionality of the optical electronic devices.
Implementation Method 1
a third substrate disposed in the first optical area and having a transmittance higher than the first substrate and the second substrate
Data Source
AI summary
A display panel including a first optical electronic device located under, at a lower portion of, the display panel and overlapping with at least a portion of a first optical area included in a display area, a first substrate disposed in at least a portion of a non-optical area, a second substrate disposed on the first substrate, a third substrate disposed in the first optical area and having a transmittance higher than the first substrate and the second substrate, and a bonding layer disposed on at least one surface of the third substrate, and a display device including the display panel.