Display Panel Subpixel Compensation for Under-Display Optical Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face challenges in incorporating optical electronic devices without increasing the bezel size or reducing the display area, leading to issues like luminance differences between optical and non-optical areas.
Innovation Solution
A display device design that includes optical electronic devices under the display panel, utilizing a light transmission structure and subpixel structures with luminance difference compensation, allowing normal light reception and display driving while minimizing bezel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical electronic device is located in a 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 an optical electronic device is placed under the display area, then the display area is maintained, but luminance differences occur between optical and non-optical areas
Solution Approach 1:
The patent applies different subpixel structures to different regions: standard subpixels in non-optical areas and compensation-equipped subpixels in optical areas. This local differentiation addresses the luminance uniformity issue by providing targeted compensation only where needed, without affecting other regions.
Solution Approach 2:
The patent modifies the electrical parameters (voltage signals) of subpixels in optical areas through additional transistors and control circuits. By changing the voltage parameters dynamically, the luminance output of optical area subpixels is adjusted to match non-optical areas, eliminating visible luminance differences.
3Reliability
If the number of subpixels per unit area is increased in the optical area, then light reception is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the display panel into distinct optical areas and non-optical areas, with different subpixel configurations in each. This segmentation allows the complex compensation structure to be applied only where necessary (in optical areas), rather than throughout the entire display, thus managing manufacturing complexity while maintaining light reception capability.
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 effective light detection by optical electronic devices without visible exposure, maintains image quality, and reduces luminance differences between optical and non-optical areas.
Implementation Method 1
a light transmission structure in which even when an optical electronic device is located under the 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
Implementation Method 2
a subpixel structure in the optical area having a luminance difference compensation structure that can reduce or prevent a difference in luminance between the optical area and the non-optical area
Data Source
AI summary
A display device includes subpixels disposed in a display area for displaying an image. Each subpixel includes a light emitting element; a driving transistor for driving the light emitting element; and a transistor whose turn-on or turn-off may be controlled by a gate signal supplied through a gate line. The subpixels includes a subpixel disposed in a specific area in the display area, and such subpixel may include a compensation capacitor formed by overlapping of a gate node of the driving transistor or a connection pattern connected to the gate node of the driving transistor and the gate line. A voltage level of the gate signal supplied through the gate line is changed to a lower voltage level at a timing at which a data voltage or a voltage resulting from changing of the data voltage is applied to the gate node of the driving transistor.