Under-Display Optical Sensor Integration via Gamma Compensation
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Solution Overview
Problem
Display devices face challenges in integrating optical electronic devices, such as cameras, without increasing the bezel size or reducing the display area, while also addressing luminance differences and boundary perception issues between optical and normal areas.
Innovation Solution
The implementation of a display device with a light transmission structure and compensation techniques, including a compensation capacitor structure and gamma curve differentiation, to allow optical electronic devices to be placed under the display panel without exposing them on the front surface, maintaining normal display driving and reducing luminance differences and boundary perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical electronic device is located in the front portion of the display device to receive incident light, then the optical electronic device can be effectively exposed to light, but the bezel size increases or the display area is reduced
Solution Approach 1:
The patent moves the optical electronic device from the front surface (2D plane) to the rear side of the display panel, utilizing the third dimension (depth) to resolve the spatial conflict between light reception and display area. This allows the optical device to receive light through the display panel without occupying front surface space.
Solution Approach 2:
The display panel itself acts as an intermediary medium, allowing light to pass through it to reach the optical electronic device on the rear side. This mediator enables the optical device to function without being exposed on the front surface, thus maintaining full display area while ensuring light reception capability.
2Area of stationary object
If the optical electronic device is placed under the display panel, then the display area is maintained, but luminance difference occurs between the optical area and normal area
Solution Approach 1:
The patent applies different gamma curves to different regions of the display panel: a first gamma curve for the optical area where the optical electronic device is located, and a second gamma curve for the normal area. This local differentiation compensates for luminance differences caused by light transmission requirements in the optical area.
Solution Approach 2:
The patent modifies the gamma curve parameter specifically for the optical area to compensate for the luminance reduction caused by light transmission. By changing this display parameter locally, the patent maintains overall luminance uniformity across the display while allowing light transmission in the optical area.
3Illumination intensity
If luminance difference compensation is applied to the optical area, then luminance uniformity is improved, but boundary perception phenomenon occurs between optical area and normal area
Solution Approach 1:
The patent introduces a transition zone between the optical area and normal area where the gamma curve gradually changes from the first gamma curve to the second gamma curve. This dynamic, gradual transition prevents abrupt luminance changes at the boundary, thereby reducing boundary perception while maintaining luminance uniformity.
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
Enables normal display performance and reduced luminance differences between optical and normal areas, preventing bezel size increase and maintaining image quality by integrating optical electronic devices under the display panel.
Implementation Method 1
a light transmission structure in which even when an optical electronic device is located under a display area of the display panel, and thus, is not exposed in the front surface of the display device, the optical electronic device can normally and properly receive or detect light
Data Source
AI summary
The present disclosure provides a display device including a plurality of subpixels disposed in a display area for displaying images, each of the subpixels including a light emitting element, a driving transistor for driving the light emitting element. The display area may include a first area, a second area surrounding the first area, and a third area between the first area and the second area. First, second, and third subpixels among the plurality of subpixels are disposed in the first, second, and third areas, respectively. When first data corresponding to the first subpixel is equal to second data corresponds to the second subpixel, the luminance of the first subpixel may be greater than the luminance of the second subpixel.