Display Driver Load Controller for Overcurrent Prevention
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Solution Overview
Problem
Display devices face issues with power consumption and overcurrent phenomena due to differences in driving current between data driver chips, leading to potential burnout and uneven luminance.
Innovation Solution
A display device and driving method that include a load controller to determine a scale factor for adjusting the target luminance based on the load of image data, limiting the driving current by calculating total and local loads and generating sub-scale factors for each data driver chip to prevent overcurrent and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display panel maintains peak luminance when data is set to a predetermined load or less, then the luminance is preserved, but the overcurrent phenomenon occurs when data exceeds the predetermined load
Solution Approach 1:
The patent segments the data driver chips into multiple groups, where each group is driven by a separate data driver chip. The load controller calculates individual loads for each data driver chip and applies different scale factors to each group, preventing overcurrent in specific regions while maintaining overall luminance performance.
Solution Approach 2:
The patent implements local quality control by calculating individual loads for each data driver chip and applying chip-specific scale factors. This allows different regions of the display panel to have different luminance characteristics based on their actual load conditions, preventing overcurrent in high-load regions while maintaining peak luminance in low-load regions.
2Reliability
If the driving current is limited for each data driver chip, then the overcurrent phenomenon is prevented, but the luminance difference between data driver chips increases
Solution Approach 1:
The patent dynamically adjusts the scale factors for each data driver chip based on real-time load conditions. The load controller continuously calculates individual loads and modifies scale factors accordingly, enabling the system to adapt to changing conditions and maintain luminance uniformity while preventing overcurrent.
Solution Approach 2:
The patent changes the operating parameters (scale factors) of each data driver chip based on calculated load conditions. By adjusting these parameters dynamically, the system can prevent overcurrent in high-load chips while maintaining luminance uniformity through coordinated parameter changes across all chips.
3Device complexity
If a single scale factor is applied to all data driver chips, then the device complexity is reduced, but the overcurrent phenomenon occurs due to load differences between chips
Solution Approach 1:
The patent segments the control approach into individual chip-level load calculation and scale factor determination. While this increases some control complexity, it enables precise overcurrent prevention for each chip, and the overall system complexity is managed through automated load calculation algorithms.
4Illumination intensity
If the driving current is increased to maintain peak luminance, then the luminance is improved, but the power consumption increases
Solution Approach 1:
The patent changes the driving current parameters dynamically by applying chip-specific scale factors based on load conditions. This allows the system to maintain peak luminance in low-load conditions while reducing power consumption in high-load conditions, optimizing the balance between luminance and energy efficiency.
Data Source
AI summary
Provided are a display device and a driving method thereof. The display device includes: a display panel for displaying an image, based on data signals supplied from data lines; a load controller for determining a scale factor for controlling a target luminance of the image displayed in the display panel, based on a load of first image data input from the outside; and a data driver for outputting data signals to the data lines, corresponding to the first image data corrected using the scale factor. The data driver includes a plurality of data driver chips coupled to at least one data line among the data lines. The load controller determines the scale factor, based on at least one of a total load of the first image data and local loads with respect to the respective data driver chips.