Display Panel Data Slew Control for Uneven Pixel Charging
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Solution Overview
Problem
Display devices face issues with insufficient data charging and varying data charge rates across pixel positions, leading to deteriorated image quality.
Innovation Solution
A display device with data drivers that adjust slew rates and bias currents based on pixel block positions and maximum grayscale values, using a timing controller to optimize image quality by controlling data signal output timing and intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the data signal level is increased to improve image quality, then the data signal quality is improved, but data charging becomes insufficient and image quality deteriorates
Solution Approach 1:
The patent implements dynamic slew rate adjustment where the data driver circuit changes the slew rate of data signals based on the grayscale values being transmitted. Different grayscale ranges (e.g., 0-63, 64-127, 128-191, 192-255) are assigned different slew rate levels, allowing the system to optimize signal quality for each specific transmission condition rather than using a fixed slew rate for all cases.
Solution Approach 2:
The patent changes the temporal parameter (slew rate) of the data signal based on the signal's amplitude characteristics (grayscale value). The timing controller calculates the maximum grayscale value in the image data and communicates this to the data driver, which then adjusts the slew rate accordingly. This parameter adaptation ensures that data charging is sufficient for high grayscale values while maintaining signal integrity for low grayscale values.
2Device complexity
If a fixed data signal slew rate is used for all pixel blocks, then the device complexity is reduced, but image quality deteriorates due to varying data charge rates across different pixel positions
Solution Approach 1:
The patent divides the display panel into multiple pixel blocks and assigns different slew rate settings to different pixel blocks based on their positions and local image characteristics. The timing controller calculates the maximum grayscale value for each pixel block independently and transmits this information to the corresponding data driver, which then applies the appropriate slew rate locally. This allows each region to be optimized for its specific requirements while maintaining overall system functionality.
3Productivity
If the data signal slew rate is increased to improve data charging, then data charging performance is improved, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts the slew rate parameter based on the actual data charging requirements determined by grayscale values. Instead of maintaining a high slew rate (and high power consumption) for all conditions, the system uses low slew rates when transmitting low grayscale values and only increases slew rate when high grayscale values require faster charging. This adaptive approach ensures power is consumed only when necessary for image quality.
Data Source
AI summary
A display device and an electronic device including the display device are configured to increase a data slew rate of a pixel block having a relatively low data charging rate. The display device includes a display panel including data lines and pixel blocks connected to the data lines, data drivers for supplying data signals to the data lines, and a timing controller for controlling the data drivers. Each of the data drivers adjusts slew rates of the data signals, based on a maximum grayscale value of an image displayed through the pixel blocks and positions of the pixel blocks relative to the display panel, and the timing controller calculates the maximum grayscale value of the image, based on an input grayscale value, an input luminance value, and a load value of each of the pixel blocks, which are calculated based on input image data.