OLED Current Limiter Adjusts Driving Current via On-Pixel Ratio
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Solution Overview
Problem
As flat panel displays, particularly OLEDs, increase in size and resolution, their power consumption also increases, necessitating a solution to reduce driving current while maintaining image quality without data loss.
Innovation Solution
An image processing device with a current limiter calculates compensating data based on the on-pixel ratio of an image signal, which is used to adjust the compensation brightness data, allowing the brightness controller to select appropriate gamma sets and dimming values, thereby decreasing the driving current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the size and resolution of flat panel displays are increased, then the display quality and viewing experience are improved, but the power consumption increases
Solution Approach 1:
The patent applies local quality by adjusting the driving current based on the on-pixel ratio - different regions or pixels receive different current levels depending on whether they are actively displaying content. This allows high resolution display quality where needed while reducing power consumption in inactive or less critical areas.
Solution Approach 2:
The patent changes the driving current parameter dynamically based on the on-pixel ratio calculation. By adjusting this electrical parameter according to actual display needs, the system maintains high resolution output quality while optimizing power consumption through adaptive current modulation.
2Use of energy by moving object
If the driving current is decreased to reduce power consumption, then the power consumption is reduced, but the image quality may be degraded or data loss may occur
Solution Approach 1:
The patent implements feedback by calculating the on-pixel ratio and using this information to dynamically adjust the driving current. This closed-loop approach ensures that current reduction does not compromise image quality - the system continuously monitors display content characteristics and adapts the driving parameters accordingly to maintain quality while saving power.
Solution Approach 2:
The patent performs preliminary calculation of the on-pixel ratio before adjusting the driving current. This advance analysis allows the system to pre-determine the appropriate current level that will maintain image quality while reducing power consumption, preventing quality degradation before it occurs.
3Use of energy by moving object
If the on-pixel ratio is calculated and compensating data is applied, then the driving current is optimized, but the processing complexity increases
Solution Approach 1:
The patent applies self-service by having the display system automatically calculate its own on-pixel ratio and adjust its driving current without external intervention. This self-regulating mechanism optimizes power consumption while keeping processing requirements manageable, as the system uses its existing display data to perform the calculation and adjustment.
Data Source
AI summary
An image processing device includes a current limiter and a brightness controller. The current limiter calculates compensating data based on an on-pixel ratio of an image signal and calculates a compensation brightness data of the image signal based on the compensating data. The compensating data decreases the driving current of the image signal. The brightness controller selects one of a plurality of gamma sets and one of a plurality of dimming values based on the compensation brightness data.