OLED Display Driving Method for Ambient Light Visibility
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Solution Overview
Problem
Organic electro luminescence displays face challenges in reducing power consumption and maintaining image visibility, especially in varying ambient light conditions, leading to potential deterioration in image quality and reduced visibility in bright environments.
Innovation Solution
A control unit is introduced, comprising a pixel unit, scan driver, data driver, first and second signal processors, and a photo sensor, which estimates whether the image is moving or still, adjusts gamma values based on ambient light, and modifies RGB data to enhance visibility and reduce power consumption by varying the change range of the data according to the image type and ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the driving voltage is collectively reduced to reduce power consumption, then power consumption is reduced, but brightness is lowered in undesired regions causing deterioration in picture quality
Solution Approach 1:
The patent applies local quality by dividing the display screen into multiple regions and applying different driving voltages to each region based on its specific requirements. The control unit identifies undesired dark regions and applies higher driving voltages only to those specific regions while maintaining lower voltages in other areas, thus reducing overall power consumption without compromising picture quality in critical areas.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting the driving voltage for each pixel or region based on real-time analysis of the image content and ambient light conditions. The control unit continuously monitors the display content and modifies driving voltages adaptively, transitioning from static collective voltage control to dynamic localized voltage control, thereby optimizing both power consumption and picture quality.
2Illumination intensity
If the brightness is increased to improve visibility in bright environments, then visibility is improved, but power consumption is increased
Solution Approach 1:
The patent applies local quality by selectively increasing brightness only in regions where visibility is compromised by ambient light conditions. The control unit analyzes the ambient light environment and identifies specific regions requiring enhanced brightness, applying increased driving voltages only to those regions rather than uniformly increasing brightness across the entire display, thus improving visibility while minimizing power consumption increase.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the driving voltage parameter based on ambient light conditions and display content. The system monitors environmental factors and modifies the voltage parameter adaptively, increasing voltage only when and where necessary to maintain visibility, rather than maintaining a constantly high voltage level, thereby balancing visibility requirements with power consumption constraints.
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 and improves image visibility by dynamically adjusting the display's brightness and saturation in response to ambient light, ensuring better performance in diverse environments, including strong solar light conditions.
Implementation Method 1
the organic electro luminescence displays an image using an organic light emitting diode (OLED) which generates light by means of the recombination of electrons and holes
Implementation Method 2
A photo sensor generates a photo sensor signal corresponding to the intensity of the ambient light
Data Source
AI summary
An organic electro luminescence display and driving method uses an image determination unit to generate image determination signals indicative of whether images generated in response to data signals are moving images still images, selects a gamma value corresponding to the brightness of the ambient light sensed, applies gamma correction signals corresponding to selected gamma values to control grey level voltages of the data signals, generates a selection signal based on a comparison of a previously set reference value with the photo sensor signal, and generates R′,G′,B′ data to vary an input image RGB data to correspond to the selection signal, varies a change range of the changing R′,G′,B′ data to correspond to the image determination signal, and supplies the varied change range of the changing data (R′,G′,B′ data) to the data driver.