Display Assembly Layout for Under-Display Camera Transmittance
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Solution Overview
Problem
Existing OLED display technologies face challenges in achieving high light transmittance in non-display regions, particularly around front cameras, leading to reduced pixel density and mura (uneven brightness) due to the presence of pixel driving circuits, which limits camera size, position, and number, and increases production costs.
Innovation Solution
The display assembly separates pixel driving circuits from the display panel to the driving panel, using a flexible printed circuit (FPC) for signal transmission, allowing high light transmittance in non-display regions and maintaining consistent pixel density across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pixel driving circuits are integrated in the display panel, then device complexity is reduced, but light transmittance in non-display regions deteriorates and pixel density decreases
Solution Approach 1:
The patent divides the display system into two independent panels: a display panel containing only light-emitting devices and sub-pixel electrodes, and a driving panel containing all pixel driving circuits. This segmentation removes the obstruction of driving circuits from the display region, achieving high light transmittance (greater than 90%) while maintaining complete pixel coverage across the entire display area.
Solution Approach 2:
The patent transitions from a single-plane integration to a multi-plane stacked architecture. The display panel and driving panel are positioned at different spatial layers and connected through bonding pads and connecting lines, allowing the driving circuits to be relocated to another dimension (the driving panel layer) without interfering with the optical path of the display region.
2Illumination intensity
If pixel driving circuits are separated to the driving panel, then light transmittance is improved, but device complexity increases
Solution Approach 1:
The patent merges the display panel and driving panel into a single integrated display device through direct bonding of bonding pads and connecting lines. This merging approach consolidates the two separate panels into one unified structure, reducing the need for external connectors and simplifying the overall device architecture despite the functional separation of components.
Solution Approach 2:
The patent introduces bonding pads and connecting lines as intermediary elements that establish electrical connections between the display panel and driving panel. These intermediaries enable signal transmission between the two panels while maintaining a compact integrated structure, avoiding the complexity of external wiring and connectors.
3Ease of manufacture
If pixel driving circuits are integrated in the display panel, then manufacturing process is simplified, but pixel density and uniformity deteriorate
Solution Approach 1:
The patent segments the pixel structure into independent light-emitting devices on the display panel and driving circuits on the driving panel. This allows each sub-pixel region to be fully utilized for light emission without being occupied by driving circuit elements, achieving uniform pixel density across the entire display area and eliminating mura effects caused by circuit interference.
4Area of stationary object
If pixel driving circuits occupy display region, then area utilization is reduced, but camera functionality is limited
Solution Approach 1:
The patent segments the driving circuits from the display region into a separate driving panel. This creates a clear distinction between the optical display area and the electronic control area, allowing the entire display surface to be optimized for light emission while the driving panel handles all control functions, thereby maximizing both display area and camera functionality.
Solution Approach 2:
The patent relocates driving circuits to another spatial dimension (the driving panel layer), freeing up the display region completely. This dimensional separation allows cameras to be positioned at various locations on the display surface without being constrained by the presence of driving circuits in the optical path, significantly enhancing camera adaptability.
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 enhances camera functionality by reducing light transmittance limitations, minimizes production costs, and ensures uniform pixel density, improving the display's visual experience.
Implementation Method 1
The plurality of first bonding pads are coupled to the plurality of second bonding pads through the flexible printed circuit
Implementation Method 2
a material of the portion of the first connecting line located in the second display region is a transparent conductive material
Data Source
AI summary
A display assembly includes a display panel and a driving panel. The display panel has a display region and a non-display region, and the display region includes a first display region and a second display region that are adjacent. The display panel includes first pixel driving circuits, first light-emitting devices, and second light-emitting devices; the first pixel driving circuits and the first light-emitting devices are located in the first display region, and a first pixel driving circuit is coupled to a first light-emitting device and configured to drive the first light-emitting device to emit light; and the second light-emitting devices are located in the second display region. The drive panel includes second pixel driving circuits, a second pixel driving circuit is coupled to a second light-emitting device, and configured to drive the second light-emitting device to emit light.