OLED Display Panel Brightness Uniformity via Pixel Row Segmentation
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Solution Overview
Problem
OLED display panels face issues with uneven display brightness due to varying numbers of bright and dark pixels in dimming mode, causing voltage drops and uneven current consumption, which affects image quality.
Innovation Solution
The OLED display panel is configured with a display region divided into two areas, where the second display region has fewer pixels than the first, and the light-emitting driver circuit supplies a specific number of light-emitting cycles, while the scanning driver circuit scans each pixel row within a frame time that satisfies a particular ratio, ensuring consistent pixel row counts across bright and dark stripes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dimming mode is used to suppress image retention, then image retention is reduced, but display brightness becomes uneven due to varying numbers of bright and dark pixels
Solution Approach 1:
The display region is divided into a first display region with N1 pixel rows and a second display region with N2 pixel rows. The second display region is specifically designed to contain an integer multiple of the total number of light-emitting cycles, ensuring that bright and dark pixels are evenly distributed across the display area, thus maintaining brightness uniformity while suppressing image retention.
Solution Approach 2:
The patent changes the parameter of pixel row distribution by configuring the second display region to have N2 pixel rows where N2 is an integer multiple of the total light-emitting cycles. This parameter adjustment ensures that the number of bright and dark pixels remains consistent across different scanning positions, resolving the brightness unevenness issue.
2Illumination intensity
If the number of pixel rows in the second display region is increased to accommodate more light-emitting cycles, then brightness uniformity is improved, but the overall display region area increases
Solution Approach 1:
The patent introduces a new dimension by dividing the display region into two distinct areas (first display region and second display region) with different pixel row configurations. This dimensional approach allows the second display region to be optimized for brightness uniformity without necessarily expanding the overall display area, as the regions can be arranged in different spatial configurations.
3Illumination intensity
If the scanning time is extended to complete all light-emitting cycles, then brightness uniformity is improved, but the frame rate decreases
Solution Approach 1:
The patent performs preliminary action by pre-configuring the second display region with N2 pixel rows that is an integer multiple of the total light-emitting cycles. This preliminary design ensures that the scanning process can complete all light-emitting cycles efficiently without requiring extended scanning time, thereby maintaining both brightness uniformity and frame rate.
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 maintains consistent current consumption and reduces voltage drops, thereby resolving the uneven display issue and improving image quality by keeping the maximum and minimum bright pixel counts close, ensuring a stable display performance.
Implementation Method 1
Organic light-emitting diode (OLED) display panels are display devices made of organic materials
Data Source
AI summary
An organic light emitting (OLED) display panel, a driving method thereof, and a display apparatus are provided. The OLED display panel comprises a display region including N number of pixel rows and a non-display region including a light-emitting driver circuit and a scanning driver circuit. The display region includes a first display region including N1 number of pixel rows and a second display region including N2 number of pixel rows, where N1, N2, and N are positive integers, and N1+N2=N. A pixel row in the second display region has a smaller number of pixels than a pixel row in the first display region. The light-emitting driver circuit is configured to, in scanning time S for each frame, supply a light-emitting control signal having n number of light-emitting cycles to each pixel row in the display region, where n is a positive integer.