OLED Drive Voltage Adjustment Using Brightness Change Rate
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Solution Overview
Problem
OLED display apparatuses face high power consumption issues, particularly as pixel density increases, necessitating a need for power-saving solutions without compromising display performance.
Innovation Solution
An adjustment method for OLED display apparatuses that involves obtaining a gamma curve, detecting brightness changes with varying voltage inputs, and programming optimal voltage values into a drive chip to ensure accurate grayscale representation while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If OLED display apparatuses operate drive transistors in non-saturation region with theoretical voltage values, then device complexity is reduced and ease of manufacture is improved, but power consumption increases and display efficiency deteriorates
Solution Approach 1:
The patent changes the operating parameters of drive transistors by adjusting power signal voltage values to transition transistors from non-saturation to saturation region operation. This involves measuring actual voltage values and gamma curves, then programming corrected voltage values into the drive chip to optimize power consumption while maintaining display performance.
Solution Approach 2:
The patent implements a feedback mechanism where the actual voltage value of power signal lines is measured, compared with theoretical values, and corrected through programming the drive chip. This closed-loop approach ensures that the display apparatus operates at optimal power consumption levels by continuously adjusting parameters based on actual performance data.
2Illumination intensity
If OLED display apparatuses increase pixel density to improve display quality, then illumination intensity and color accuracy are improved, but power consumption increases
Solution Approach 1:
The patent optimizes power consumption at high brightness levels by adjusting the voltage values of power signal lines to ensure drive transistors operate in the saturation region. This parameter adjustment reduces the voltage difference between theoretical and actual values, thereby lowering power consumption while maintaining high display brightness and quality.
3Manufacturing precision
If theoretical voltage values are used for power signal lines, then ease of operation is improved and device complexity is reduced, but manufacturing precision and power optimization deteriorate
Solution Approach 1:
The patent performs preliminary measurement and characterization of the display apparatus, including obtaining actual voltage values and gamma curves before final assembly. This preliminary action allows for accurate determination of optimal power signal voltage values, which are then programmed into the drive chip, ensuring manufacturing precision without complicating the final assembly process.
Data Source
AI summary
A display apparatus, an adjustment method and a formation method are provided in the present disclosure. The adjustment method includes recording a voltage value inputted to the first power signal line as a value A, where the value A is an actual voltage value of the first power signal line when the display panel is at the first target brightness level and the drive transistor operates in a saturation region; inputting the value A to the first power signal line in the display panel, reading a first actual data voltage value on a data line in the display panel at this point, and re-finding a first actual grayscale value corresponding to the first actual data voltage value from the gamma curve; and programming the value A, the first actual data voltage value and the first actual grayscale value corresponding to the value A into the drive chip.