Organic Light Emitting Display Region-Specific Current Limiting
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Solution Overview
Problem
Flexible organic light emitting display devices with bent regions face challenges in power consumption due to varying luminance and viewing angles, as existing automatic current limit (ACL) technologies do not effectively manage power usage across different display regions.
Innovation Solution
An organic light emitting display device with a controller that calculates On Pixel Ratio (OPR) for each display region, generating corrected video data to adjust driving current by applying separate automatic current limits to first and second display regions, and optionally using an average OPR for boundary regions to minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high luminance is displayed to improve image quality, then power consumption increases
Solution Approach 1:
The display screen is divided into multiple display regions (first display region, second display region, and third display region) with different ACL values applied to each region. This segmentation allows different luminance levels to be maintained in different areas, improving overall power efficiency while preserving image quality where needed.
Solution Approach 2:
Different automatic current limit (ACL) values are applied to different display regions based on their specific characteristics. The first display region uses a first ACL value, the second display region uses a second ACL value, and the third display region uses a third ACL value that is lower than both. This local differentiation optimizes power consumption by adjusting luminance according to regional requirements.
2Use of energy by moving object
If ACL is applied uniformly to the entire display, then power consumption is reduced, but display quality becomes inconsistent across regions
Solution Approach 1:
The display is segmented into multiple regions with different ACL values to maintain luminance consistency. By dividing the screen and applying region-specific ACL values, the system prevents uniform dimming that would occur with a single ACL value, thereby maintaining display quality across all regions while still achieving power savings.
Solution Approach 2:
Different ACL values are assigned to different display regions to account for variations in luminance characteristics. This local quality approach ensures that each region maintains appropriate luminance levels for its specific function, preventing the luminance inconsistency that would result from uniform ACL application.
3Adaptability or versatility
If the display is bent to create flexible form factors, then viewing angles and luminance distribution vary across regions
Solution Approach 1:
The bent display is segmented into multiple regions (first display region, second display region, third display region) with different ACL values. This segmentation compensates for the luminance distribution variations caused by bending, allowing each region to be optimized for its specific viewing conditions and maintaining overall display quality.
Solution Approach 2:
Different ACL values are applied to different regions of the bent display to compensate for viewing angle and luminance distribution variations. The third display region, which has different characteristics due to the bend, receives a different ACL value (lower than both first and second regions) to maintain luminance consistency across the entire flexible display.
Data Source
AI summary
Provided is an organic light emitting display device including: a display unit having a first display region and a second display region, and comprising a plurality of pixels; and a controller configured to calculate an OPR (On Pixel Ratio) of the plurality of pixels from video data input from an outside, and to generate corrected video data for decreasing driving current of the plurality of pixels based on the OPR, the OPR including a first OPR that corresponds to the first display region and a second OPR that corresponds to the second display region.