Voltage Drop Compensator for OLED Display Panels
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Solution Overview
Problem
Voltage drops in OLED displays due to power line resistance lead to non-uniform brightness and decreased image quality, as the voltage drop amount varies with image data.
Innovation Solution
A voltage drop compensator for OLED displays that divides the panel into regions, calculates expected current based on input data, generates a conversion matrix using line resistance, and compensates voltage drops by interpolating representative voltages to maintain uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If power lines with non-zero resistance are used to supply voltage to pixels in OLED display, then the display can be constructed with practical wiring, but voltage drops occur causing non-uniform brightness and decreased image quality
Solution Approach 1:
The display panel is divided into multiple regions (e.g., 9 regions arranged in 3x3 grid), and representative voltages are calculated for each region based on local current consumption characteristics. This segmentation allows differential voltage compensation across different areas of the display, addressing the non-uniform brightness caused by voltage drops in power lines with practical resistance values.
2Illumination intensity
If voltage drop compensation is implemented across the entire display panel, then brightness uniformity can be maintained, but the computational complexity and processing time increase
Solution Approach 1:
Instead of calculating voltage compensation for every single pixel, the method calculates representative voltages for a reduced set of regions (e.g., 9 regions per frame). This partial action approach maintains brightness uniformity across the entire display while significantly reducing computational complexity compared to per-pixel compensation.
Solution Approach 2:
The conversion matrix is pre-calculated based on the power line resistance characteristics and display geometry. This preliminary computation stores the relationship between current consumption and voltage drop, allowing rapid voltage compensation during actual display operation without repeated complex calculations for each frame.
3Productivity
If conversion matrix is pre-calculated and stored in LUT, then voltage compensation speed is improved, but memory requirements and initial setup complexity increase
Solution Approach 1:
The conversion matrix that relates current consumption to voltage drop is calculated in advance and stored in a lookup table (LUT). This preliminary action enables fast voltage compensation during display operation by simply retrieving pre-computed values from the LUT based on measured current consumption, rather than performing complex real-time calculations.
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
The solution effectively compensates voltage drops across regions, improving brightness uniformity and overall display quality by calculating and adjusting voltage levels based on line resistance and input data.
Implementation Method 1
generates a conversion matrix that converts the expected current to a representative voltage provided to the plurality of regions based on a line resistance of the power line
Data Source
AI summary
A voltage drop compensator for a display device and the display device including the same are disclosed. In one aspect, the voltage drop compensator includes a region divider, an expected current calculator, a conversion matrix generator, a representative voltage calculator, and a compensator. The region divider is configured to divide the display panel into a plurality of regions, and the display panel includes a plurality of power lines and a plurality of pixels configured to receive a power voltage via the power lines. The expected current calculator is configured to calculate an expected current to flow in each of the regions based on input data provided to each of the regions. The conversion matrix generator configured to generate a conversion matrix based on a line resistance of each of the power lines and convert the expected current to a representative voltage provided to the regions based on the conversion matrix.