Transparent Emission Pixel Layout for Under-Display Sensor Areas
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Solution Overview
Problem
There is a demand for a transparent display device that maximizes the display area while accommodating components like cameras or optical sensors, which requires a structure that combines both transparency and display functionality without the need for a separate backlight, offering improved viewing angles, contrast ratios, and reduced thickness and weight.
Innovation Solution
A partial transparent electroluminescence (EL) display device is designed with a substrate featuring a transparent emission area for light transmission and a driving emission area for display, where the transparent emission pixels lack scan lines and data lines, and the driving emission pixels are driven by these lines, allowing for a seamless integration of camera or sensor functionality within the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a separate backlight is used to achieve display function, then display brightness is improved, but device thickness and weight increase
Solution Approach 1:
The patent merges the backlight function and display function into a single integrated structure. The light emitting layer serves dual purposes: it acts as the backlight source and simultaneously generates the display image through electroluminescence, eliminating the need for a separate backlight unit and reducing overall device weight
Solution Approach 2:
The light emitting layer is designed to perform multiple functions: it generates ambient light for transparency mode and produces colored light for display mode. By controlling the electroluminescence properties of this single layer, the system achieves both backlighting and image display without requiring additional components
2Adaptability or versatility
If camera or optical sensor is disposed in bezel area, then component functionality is achieved, but display area ratio decreases
Solution Approach 1:
The patent moves the camera and optical sensor from the traditional 2D bezel area into the 3D display area by integrating them within the transparent emission area. This allows components to be positioned in a different spatial dimension (within the display plane rather than around it), enabling the display area to extend to the edges of the substrate while maintaining component functionality
Solution Approach 2:
The display panel is divided into regions with different properties: the transparent emission area allows light transmission for camera/sensor integration, while the emission area provides opaque display functionality. This local differentiation enables components to be positioned in specific zones without compromising overall display area
3Ease of operation
If transparent emission pixels include scan lines and data lines, then pixel addressing is achieved, but transparency and light transmission are reduced
Solution Approach 1:
The patent segments the pixel addressing function into two separate regions: the driving emission area contains the scan lines and data lines for pixel control, while the transparent emission area excludes these lines to maintain light transmission. This functional segmentation allows each region to optimize for its primary purpose
4Area of stationary object
If display device achieves edge-to-edge display area, then display area ratio is improved, but integration of optical components becomes difficult
Solution Approach 1:
The patent applies different structural characteristics to different regions: the transparent emission area has optimized light transmission properties for optical component integration, while the emission area has optimized display properties. This allows edge-to-edge display area while providing dedicated zones for component integration
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 the display area ratio by enabling both light transmission and display functions, maintaining high pixel density and resolution, especially in areas where camera or sensor functionality is integrated, while maintaining efficient power usage and manufacturing costs.
Implementation Method 1
An EL display device employs a spontaneous emission system... When a high-potential voltage is applied to the anode electrode and a low-potential voltage is applied to the cathode electrode, holes in the anode electrode and electrons in the cathode electrode move to the lighting emitting layer. When holes and electrons are coupled in the light emitting layer, excitons are formed in the course of excitation and light is generated due to energy from the excitons.
Data Source
AI summary
A partial transparent display device has a light transmitting function and a light emitting function in one area. The partial transparent display device includes a substrate, a transparent emission area, a driving emission area, and a pad part. The transparent emission area is disposed to be adjacent to one side of the substrate. The driving emission area is disposed to be adjacent to the transparent emission area and to be closer to the other side opposite to the one side. The pad part extends from the driving emission area and is disposed on the other side. The driving emission area includes driving emission pixels which are defined by scan lines, data lines, and pixel driving power supply lines. The transparent emission area includes transparent emission pixels which are defined without the scan lines, the data lines, and the pixel driving power supply lines.