OLED Drive Circuit Voltage Adjustment for Contrast and Power
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Solution Overview
Problem
OLED display panels experience a lower dynamic contrast ratio when brightness is higher or lower than specified levels, leading to suboptimal display performance and increased power consumption.
Innovation Solution
A drive method for OLED display panels that adjusts the voltage applied to the second electrode and the data signal applied to the first electrode based on grayscale data, using a pixel drive circuit with a drive transistor, first and second power supply terminals, and switch transistors to optimize brightness and contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness is increased under low grayscale conditions, then the display brightness is improved, but the dynamic contrast ratio deteriorates
Solution Approach 1:
The patent applies dynamics by making the common voltage adjustable rather than fixed. The common voltage is dynamically changed based on the maximum grayscale of the displayed image, allowing the system to adapt between different operating conditions (high brightness mode and high contrast mode) to resolve the contradiction between brightness and contrast ratio
Solution Approach 2:
The patent changes the voltage parameter (common voltage) based on the image characteristics (maximum grayscale). By adjusting the common voltage according to the grayscale range, the system can optimize both brightness and contrast ratio performance for different display scenarios
2Illumination intensity
If the common voltage is increased to improve brightness, then the illumination intensity is improved, but the power consumption increases
Solution Approach 1:
The patent changes the common voltage parameter dynamically based on the maximum grayscale of the displayed image. When the maximum grayscale is low, a lower common voltage is applied to reduce power consumption. When the maximum grayscale is high, a higher common voltage is applied to improve brightness, thus optimizing the balance between illumination intensity and power consumption
Data Source
AI summary
Provided are a drive method of a display panel, a storage medium, a drive device and a display device. The drive method includes: in an Nth frame, applying a first voltage to the second electrode and a first data signal matched with a first voltage to the first electrode through the pixel drive circuit based on grayscale data of the Nth frame; wherein N is a positive integer; in an (N+1)th frame applying a second voltage to the second electrode and a second data signal matched with the second voltage to the first electrode through the pixel drive circuit based on grayscale data of the (N+1)th frame, wherein the first voltage is different from the second voltage.