OLED Brightness Control Using Ambient Light and Frame Data
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional organic light emitting displays experience increased power consumption due to high current flow from a large number of pixels emitting light, especially those displaying high grayscale values, and emit light at constant brightness regardless of peripheral light intensities, leading to unnecessary brightness and higher power consumption.
Innovation Solution
An organic light emitting display with a brightness controller that adjusts the emission control signals based on frame data and peripheral light intensities, using a combination of data summing units, look-up tables, and photo sensors to limit the emission control signal widths, thereby controlling the display's brightness and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large number of pixels emit light with high grayscale values, then the display brightness is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic brightness control by adjusting the emission control signal width based on the sum of grayscale values of all pixels. The brightness controller dynamically modifies the emission duration to match the actual brightness requirements, preventing excessive power consumption while maintaining adequate display brightness. This is achieved through real-time calculation of the grayscale sum and adaptive adjustment of the emission control signal parameters.
Solution Approach 2:
The patent changes the emission control signal parameter (signal width/duration) based on the calculated sum of grayscale values. By varying this parameter according to the actual display content brightness requirements, the system optimizes power consumption while maintaining necessary display performance. The emission control signal width is specifically adjusted to match the aggregate brightness demand of all pixels.
2Illumination intensity
If the display emits light at constant high brightness, then the visibility is improved, but the power consumption increases unnecessarily
Solution Approach 1:
The patent implements a feedback mechanism where the brightness controller continuously monitors the sum of grayscale values of all pixels and adjusts the emission control signal accordingly. This closed-loop control ensures that the display brightness matches the actual content requirements, preventing energy waste from excessive brightness while maintaining adequate visibility. The feedback loop compares the calculated grayscale sum against predetermined thresholds to determine appropriate emission control adjustments.
Solution Approach 2:
The system transitions from static constant brightness to dynamic adaptive brightness control. The emission control signal width is continuously adjusted based on real-time analysis of display content brightness requirements, enabling the system to reduce power consumption when full brightness is not needed while maintaining adequate visibility when required.
3Illumination intensity
If the emission control signal width is increased to improve brightness, then the display visibility is improved, but the power consumption increases
Solution Approach 1:
The patent dynamically changes the emission control signal width parameter based on the sum of grayscale values. Instead of using a fixed wide signal for maximum brightness, the system adjusts this parameter to the minimum necessary width to achieve adequate visibility, thereby reducing power consumption. The signal width is specifically modulated to match the aggregate brightness demand of the display content.
Solution Approach 2:
The emission control signal width transitions from a static fixed value to a dynamic variable that adapts to content requirements. This dynamic adjustment allows the system to use narrower (lower power) signals when content brightness is low and wider (higher power) signals when content brightness is high, optimizing the power-brightness tradeoff in real-time.
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 limiting the brightness of the display region in response to the number of high grayscale pixels and peripheral light intensities, maintaining power within a certain range while preventing user fatigue and improving contrast.
Implementation Method 1
a photo sensor for sensing the intensities of the peripheral light
Data Source
AI summary
An organic light emitting display capable of reducing power consumption and controlling brightness in response to the intensities of peripheral light. The organic light emitting display includes a data driver for supplying data signals to data lines, a scan driver for sequentially supplying scan signals to scan lines and sequentially supplying emission control signals to emission control lines, a display region including a plurality of pixels for receiving the data signals, the scan signals and the emission control signals to display images and a brightness controller for controlling the brightness of the display region. The brightness controller controls the brightness of the display region in response to the data of one frame and the intensities of peripheral light. This system reduces power consumption, controls the brightness of the display region in response to the intensities of the peripheral light and improves the contrast of the display region.