Display Panel Local Load Scaling for Overcurrent Protection
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Solution Overview
Problem
Existing display apparatuses fail to adjust luminance according to local loads in input image data, leading to potential overcurrent and damage to data drivers or display panels, especially when bright portions are present.
Innovation Solution
The display apparatus divides the display panel into multiple areas and determines a scale factor based on local loads for each area, applying different scale factors to the center and edge areas to prevent overcurrent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If luminance is adjusted based on entire load of input image data, then power consumption is reduced, but overcurrent may flow in locally bright portions causing damage
Solution Approach 1:
The display panel is divided into multiple display areas (e.g., first display area and second display area), and the image data is correspondingly divided into first image data and second image data. Each area is evaluated independently for local load, allowing targeted luminance adjustment only in high-load regions rather than uniformly across the entire panel. This segmentation enables localized protection against overcurrent while preserving energy in low-load areas.
Solution Approach 2:
Different scale factors are determined for different display areas based on their respective local loads. The first scale factor is determined based on the first local load of the first image data, and the second scale factor is determined based on the second local load of the second image data. This allows each region to receive customized luminance adjustment appropriate to its specific content characteristics, preventing overcurrent in bright portions while maintaining optimal brightness in other areas.
2Device complexity
If luminance is not adjusted according to local load, then device complexity is reduced, but overcurrent flows in data driver or display panel causing damage
Solution Approach 1:
The image data is segmented into multiple portions corresponding to different display areas, and local load calculation is performed separately for each segment. This modular approach to load analysis enables targeted luminance control in high-risk areas without requiring complex system-wide redesign, thus balancing reliability improvement with acceptable device complexity.
Solution Approach 2:
The local load of image data is calculated in advance before luminance adjustment is applied. By determining the first local load and second local load beforehand, the system can proactively identify regions at risk of overcurrent and apply appropriate scale factors to prevent damage before it occurs, rather than reacting to actual overcurrent conditions.
3Productivity
If uniform scale factor is applied to entire image data, then processing speed is maintained, but luminance adjustment is not applied to locally bright portions
Solution Approach 1:
The image data is divided into multiple segments corresponding to different display areas, allowing independent local load calculation and scale factor determination for each segment. This segmentation enables parallel processing of different regions, maintaining overall processing speed while achieving precise localized luminance control to prevent overcurrent in bright portions.
Solution Approach 2:
Different scale factors are determined for different display areas based on their specific local load characteristics. The first scale factor applies to the first image data and the second scale factor applies to the second image data, ensuring that luminance adjustment is precisely applied where needed in locally bright portions without requiring uniform processing across the entire image.
Data Source
AI summary
A display apparatus includes a display panel, a driving controller and a data driver. The driving controller divides input image data into a plurality of partial image data corresponding to a plurality of display areas of the display panel, calculates local loads corresponding to the plurality of partial image data, determines a scale factor based on the local loads, and applies the scale factor to the input image data to generate a data signal. The data driver converts the data signal to a data voltage and outputs the data voltage to the display panel. The scale factor for a center display area corresponding to a center of the display panel among the plurality of display areas is determined differently from the scale factor for an edge display area corresponding to an edge of the display panel among the plurality of display areas.