OLED Display Brightness Control via Average Picture Level
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Solution Overview
Problem
Conventional OLED display apparatuses consume excess power due to constant driving voltage, leading to increased power consumption even when the average picture level of an image is high, resulting in inefficient energy use.
Innovation Solution
A display apparatus and control method that adjust the gray scale of an input image based on its average picture level, using a controller to compensate for brightness and reduce power supply accordingly, with a lookup table storing compensation coefficients and duty values to maintain image brightness while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a consistent or constant driving voltage is supplied to OLED pixels, then the OLED can maintain stable operation and brightness, but power consumption increases when the average picture level is high
Solution Approach 1:
The patent applies dynamics by transitioning from a constant driving voltage to a variable driving voltage that changes based on the average picture level. The controller dynamically adjusts the driving voltage according to the detected APL, allowing the system to adapt to different image brightness conditions and reduce power consumption when high APL images are displayed.
Solution Approach 2:
The patent changes the parameter of driving voltage from a fixed value to a variable value that depends on the average picture level. By modifying the voltage parameter based on image characteristics, the system achieves both stable operation and reduced power consumption, resolving the contradiction between reliability and energy efficiency.
2Reliability
If a consistent or constant driving voltage is supplied to OLED pixels, then the OLED can maintain stable operation, but surplus voltage is generated and consumed as heat when the input image is dark
Solution Approach 1:
The system dynamically adjusts the driving voltage based on the detected average picture level. When dark images are displayed, the controller reduces the driving voltage accordingly, preventing surplus voltage generation and minimizing energy loss as heat while maintaining stable OLED operation.
Solution Approach 2:
The patent implements feedback by using an average picture level detector to continuously monitor the input image characteristics and feed this information back to the controller. The controller then adjusts the driving voltage based on this feedback, creating a closed-loop system that eliminates energy waste while maintaining operational stability.
3Loss of energy
If the average picture level reaches a predetermined level or more, then the OLED display apparatus maintains consistent power consumption rather than consuming more power in proportion to the average picture level
Solution Approach 1:
The patent applies dynamics by making the driving voltage variable rather than constant. When the average picture level reaches a predetermined threshold, the controller adjusts the driving voltage to match the actual display requirements, allowing power consumption to scale proportionally with image brightness and eliminating the plateau effect.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces power consumption by dynamically adjusting power supply based on image brightness, ensuring efficient energy use without compromising image quality, especially when the average picture level exceeds a predetermined threshold.
Implementation Method 1
The OLED emits light by itself through re-combination of holes and electrons injected to the organic layer
Data Source
AI summary
A display apparatus includes a display unit which includes a plurality of pixels having an organic light emitting diode (OLED), a power supply which supplies power to the display unit, an image processor which processes an input image to display an image on the display unit, and a controller which determines whether an average picture level (APL) of the input image is a predetermined value or more. Based on the APL value, the controller controls the image processor to compensate for a gray scale of the input image to thereby increase a brightness of the input image, and controls the power supply to reduce the power supply corresponding to the brightness increased as a result of the compensated gray scale.