Display Panel Structure for Under-Display Optics and RC Load Compensation
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Solution Overview
Problem
Display devices with integrated optical electronic devices, such as cameras or sensors, face challenges in maintaining a reduced bezel size and efficient light reception while addressing RC load differences between signal lines in overlapping and non-overlapping areas.
Innovation Solution
A display panel design with optical electronic devices located under the display area, featuring a light transmission structure and signal line compensation patterns to ensure light reception and equalize RC loads, thereby reducing bezel size and maintaining display functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical electronic device is located in the front portion of the display device to receive incident light, then the light reception function is improved, but the bezel size increases or the display area is reduced due to notches or holes
Solution Approach 1:
The optical electronic device is moved from the front surface (2D plane) to the rear side of the display panel, utilizing the third dimension (depth) to resolve the conflict between light reception and display area. Light passes through the display panel from the front to reach the optical device positioned on the rear side, eliminating the need for front surface openings.
Solution Approach 2:
The display panel itself serves as an intermediary structure that allows light to transmit from the front surface through the panel to reach the optical electronic device on the rear side. This intermediary function of the display panel enables both full display area coverage and effective light reception without requiring front surface modifications.
2Area of stationary object
If the optical electronic device is located under the display area to reduce bezel size, then the display area is improved, but the light reception efficiency deteriorates due to the display structure blocking light
Solution Approach 1:
The display panel is designed with differentiated local properties: the optical area has enhanced light transmission characteristics to allow sufficient light to reach the optical electronic device, while other areas maintain normal display functionality. This local quality differentiation ensures both full display area and adequate light reception efficiency.
3Ease of manufacture
If signal lines are disposed in the optical area overlapping with the optical electronic device, then the RC load difference between signal lines in optical and normal areas is created, but this causes non-uniform display performance
Solution Approach 1:
The signal line structure parameters are modified in the optical area compared to the normal area. Specifically, the signal lines in the optical area are designed with different dimensions (wider or longer) to increase their capacitance and resistance, thereby compensating for the additional RC load introduced by the overlapping optical electronic device and achieving uniform display performance across the display area.
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 allows for reduced bezel size and improved design freedom by hiding optical devices under the display, ensuring effective light reception and uniform display performance across overlapping and non-overlapping signal lines.
Implementation Method 1
a light transmission structure for enabling an optical electronic device under the display area, or at a lower portion, of the display panel to normally receive light transmitting the display panel
Data Source
AI summary
A display panel of a display device includes a display area including a first optical area overlapping with a first optical electronic device and a normal area located outside of the first optical area, the first optical area includes a plurality of light emitting areas and a plurality of first transmission areas, and the normal area may include a plurality of light emitting areas, a plurality of signal lines may include a first horizontal line including a first optical horizontal line portion disposed in the first optical area, and a non-optical horizontal line portion disposed in the normal area, and a second horizontal line disposed in the normal area without being disposed in the first optical area, a first outer horizontal line portion disposed in an outer area in the first optical area has a greater length per unit area compared to other portions thereof, or a width of all or a portion of the first horizontal line may be smaller than a width of the second horizontal line, thereby compensating for an RC load difference between the horizontal lines.