Display Panel Data Compensation for Luminance Uniformity
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Solution Overview
Problem
Display devices experience luminance inconsistencies and visible stains due to gate and data signal delays, especially in larger panels with dynamic pattern data, leading to uneven brightness and discoloration.
Innovation Solution
A display device with a driving controller that compensates for panel structure variations by selecting previous and current pixel data, generating spatial compensation data, and applying scaling factors to adjust pixel voltages, using precomputed lookup tables for real-time corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel size increases, then the display area is enlarged, but the gate signal delay and data voltage delay increase
Solution Approach 1:
The patent divides the display panel into multiple zones or regions with different compensation parameters. By segmenting the panel and applying zone-based compensation, the system addresses signal delays in different areas independently, allowing larger panels to maintain uniform luminance despite increased overall signal transmission distance.
2Productivity
If the driving frequency increases, then the refresh rate is improved, but the pixel charging time becomes insufficient
Solution Approach 1:
The patent applies preliminary compensation to the input image data before it is sent to the pixels. By pre-calculating and applying compensation values based on panel structure and signal delay characteristics, the pixels receive adjusted voltage levels in advance, ensuring they reach target luminance even with reduced charging time at higher driving frequencies.
Solution Approach 2:
The patent dynamically adjusts compensation parameters such as scaling factors and offset values based on the driving frequency and grayscale transitions. By changing these parameters in real-time, the system optimizes pixel charging across different operating conditions, maintaining luminance uniformity even when charging time is compressed due to higher refresh rates.
3Illumination intensity
If dynamic pattern data with varying grayscale levels is used, then the image quality is improved, but luminance inconsistencies and stains become visible
Solution Approach 1:
The patent implements a feedback mechanism where compensation values are calculated based on the relationship between previous frame data and current frame data. By analyzing grayscale transitions and signal delay patterns from prior frames, the system adjusts compensation parameters to prevent luminance inconsistencies and stains in the current frame, maintaining uniformity across dynamic content.
Solution Approach 2:
The patent applies different compensation values to different spatial locations on the panel based on local signal delay characteristics and grayscale transitions. By customizing compensation for each region rather than using a uniform approach, the system effectively addresses luminance inconsistencies that occur with dynamic patterns while preserving overall image quality.
Data Source
AI summary
A display device includes a display panel including data lines and pixels connected to the data lines, a data driver configured to provide a data voltage to the data lines through output buffers, and a driving controller configured to generate a data signal based on input image data to provide the data signal to the data driver. The driving controller compensates for the input image data based on a panel structure which is a connection structure of the data lines, the output buffers, and the pixels.