OLED Peak Luminance Control via IR Variation Compensation
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Solution Overview
Problem
The existing peak luminance control (PLC) driving method for organic light emitting display devices consumes unnecessary power due to its reliance on average picture level (APL) for controlling peak luminance, leading to reduced efficiency.
Innovation Solution
The implementation of a peak luminance control portion that adjusts the peak luminance based on both the average picture level and the IR variation amounts in the column direction, deriving a compensation value to calculate a compensated average picture level and control peak luminance accordingly, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If peak luminance control is performed based on average picture level (APL), then power consumption can be reduced, but unnecessary power is consumed and efficiency is reduced due to not accounting for IR variations
Solution Approach 1:
The patent implements a feedback mechanism by calculating IR variation amounts based on picture content characteristics and using this information to adjust peak luminance control. The system measures the difference between actual and reference APL values, derives compensation values from IR variation amounts, and applies these to optimize power consumption dynamically based on real-time picture conditions
Solution Approach 2:
The patent changes the control parameters from simple APL-based control to a compensated APL approach that incorporates IR variation amounts. By deriving compensation values based on maximum IR variation amounts in column directions and applying them to APL, the system adapts control parameters to account for electrical characteristics and power consumption variations
2Use of energy by stationary object
If peak luminance is controlled according to APL, then power consumption is reduced for bright pictures, but efficiency is reduced due to unnecessary power consumption
Solution Approach 1:
The patent performs preliminary calculations of IR variation amounts and compensation values before applying peak luminance control. By pre-calculating the maximum IR variation amounts in column directions and deriving compensation values in advance, the system ensures accurate and reliable control without unnecessary power consumption
Solution Approach 2:
The patent replaces simple APL-based control mechanics with a more sophisticated control system that incorporates electrical characteristic analysis. By substituting the basic control mechanism with one that accounts for IR variations and power consumption characteristics, the system achieves both energy efficiency and control reliability
Data Source
AI summary
An organic light emitting display device includes: a display panel including a plurality of sub-pixels arranged in a plurality of column lines and a power line, each sub-pixel being supplied with first and second power voltages and including a light emitting diode, the power line extending along a column line direction and transferring the first power voltage; and a peak luminance control portion which derives a compensation value that is adjusted according to a maximum IR variation amount of IR variation amounts in the column line direction for a picture input thereto, applies the compensation value to an average picture level of the picture to derive a compensated average picture level, and controls a peak luminance of the picture according to the compensated average picture level, wherein the IR variation amount includes IR drop amount for the first power voltage and an IR rise amount for the second power voltage.