Display Panel With Under-Display Optical Detection and Luminance Compensation
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Solution Overview
Problem
Display devices with integrated optical electronic devices face challenges in maintaining display area size and luminance uniformity due to the presence of optical electronic devices, which require light reception and result in increased bezel size or design disadvantages.
Innovation Solution
A display panel design with a light transmission structure that locates optical electronic devices under the display area, incorporating subpixels with luminance difference compensation structures to maintain image quality and reduce bezel size.
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 must be increased or a notch/hole must be formed in the display area
Solution Approach 1:
The patent inverts the conventional placement of the optical electronic device from the front surface to the rear surface of the display panel. The optical electronic device is positioned in the rear portion of the housing, allowing it to receive light that passes through the display panel from the front, thereby eliminating the need for increased bezel or display area compromises.
Solution Approach 2:
The patent transitions the optical electronic device from a two-dimensional front-surface placement to a three-dimensional rear-surface integration. By moving the device to the rear portion of the display panel and utilizing the depth dimension, the system maintains full front display area while enabling light reception through the panel structure.
2Area of stationary object
If an optical electronic device is placed under the display area, then the display area size is maintained, but the optical electronic device is not exposed in the front surface and cannot normally receive light
Solution Approach 1:
The display panel itself serves as an intermediary medium that allows light to pass from the front surface to the rear surface where the optical electronic device is located. This intermediary structure enables the device to receive light indirectly through the panel rather than requiring direct exposure.
Solution Approach 2:
The solution utilizes the third dimension (depth) by positioning the optical electronic device in the rear portion of the display panel rather than on the front surface. This dimensional transition allows the device to be concealed while still accessing light through the panel structure.
3Measurement precision
If the number of subpixels per unit area is increased in the optical area, then the display resolution is improved, but the luminance difference between the optical area and non-optical area increases
Solution Approach 1:
The patent applies different subpixel configurations to different areas of the display. The optical area (where the optical electronic device is located) has a different number of subpixels per unit area compared to the non-optical area, optimizing each region for its specific function while managing luminance characteristics.
Solution Approach 2:
The patent adjusts the subpixel density parameter in the optical area to balance resolution requirements with luminance uniformity. By changing the number of subpixels per unit area in the optical area, the system achieves adequate resolution while reducing the luminance difference between optical and non-optical regions.
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 light reception and detection by optical electronic devices without reducing the display area, preventing luminance differences and allowing for reduced bezel size and enhanced design freedom.
Implementation Method 1
The gate electrode of the drive TFT and the corresponding scan line may be capacitively coupled to each other
Implementation Method 2
a light emitting element connected to a fourth node and capable of emitting light in response to a driving current
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A display device (100) includes subpixels (SP) disposed in a display area (DA) for displaying an image. Each subpixel (SP) includes a light emitting element (ED); a driving transistor (DRT) for driving the light emitting element (ED); and a transistor whose turn-on or turn-off may be controlled by a gate signal supplied through a gate line. The subpixels (SP) includes a subpixel (SP) disposed in a specific area in the display area (DA), and such subpixel (SP) may include a compensation capacitor formed by overlapping of a gate node of the driving transistor (DRT) or a connection pattern (CP) connected to the gate node of the driving transistor (DRT) 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 (Vdata) or a voltage resulting from changing of the data voltage (Vdata) is applied to the gate node of the driving transistor (DRT).