OLED Brightness Regulation via IR Drop Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional OLED display devices experience a decrease in display picture uniformity due to IR voltage drops caused by trace impedance, affecting the brightness grayscale performance.
Innovation Solution
A brightness regulation device comprising a data converter and a timing controller that converts original and real-time power voltages into digital values, calculates a brightness regulation coefficient, and generates scanning and data control signals to compensate for IR voltage drops, ensuring uniformity by adjusting image signals across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power voltage is supplied to pixels through traces, then power delivery is achieved, but IR voltage drop occurs due to trace impedance causing non-uniform display picture
Solution Approach 1:
The patent implements a feedback mechanism where the actual power voltage at each pixel is detected and fed back to the brightness regulation device. The device then calculates the difference between actual and original power voltages, determines brightness regulation coefficients, and adjusts the image signals accordingly to compensate for IR voltage drops, thereby maintaining uniform display picture quality.
Solution Approach 2:
The patent changes the parameter of image signal values based on the detected power voltage variations. By calculating brightness regulation coefficients from the power voltage differences and applying them to adjust image signals, the system dynamically modifies display parameters to compensate for trace impedance effects and maintain uniform brightness across different pixel regions.
2Device complexity
If conventional brightness control is used, then simple control structure is maintained, but brightness grayscale performance deteriorates due to IR voltage drop
Solution Approach 1:
The patent performs preliminary detection of actual power voltages at each pixel before brightness control is applied. By measuring the real-time power voltage and comparing it with the original power voltage, the system pre-calculates brightness regulation coefficients that can be used to adjust image signals, ensuring accurate brightness control compensates for IR voltage drops.
Solution Approach 2:
The patent introduces an intermediary brightness regulation device between the power voltage supply and the display pixels. This intermediary device measures actual power voltages, calculates regulation coefficients, and adjusts image signals accordingly, serving as a mediator that compensates for the harmful effect of IR voltage drops without fundamentally changing the simple power delivery structure.
Data Source
AI summary
A brightness regulation device of a display device is disclosed. The device includes: a data converter for converting an original power voltage generated by a power voltage device into an original digital value, and converting a real-time power voltage of each pixel in multiple pixel regions into a real-time digital value; a timing controller for obtaining a difference digital value according to each real-time digital value and the original digital value, obtaining the brightness regulation coefficient according to the difference digital value, and processing an image signal inputted from an external portion according to the brightness regulation coefficient in order to generate a scanning control signal and a data control signal. A brightness regulation method of a display device and a display device are also disclosed. The present invention compensates the brightness of the pixel to decrease the IR voltage drop (IR-Drop) to improve a uniformity of the display picture.