OLED Luminance Control via Ambient Light and Frame Data
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Solution Overview
Problem
Conventional organic light emitting display devices have inconsistent visibility due to constant luminance regardless of ambient brightness, leading to increased power consumption as they emit light with the same intensity regardless of surrounding conditions.
Innovation Solution
An organic light emitting display device with a plurality of scan lines, light emission control lines, and data lines, incorporating a first luminance control unit for adjusting gamma-corrected gray level voltage based on ambient light and a second luminance control unit for managing light emission width, along with a comparator/selector to dynamically control luminance according to ambient brightness and image data, reducing power consumption and preventing excessive luminance reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional organic light emitting display devices emit light with constant luminance, then the display maintains consistent brightness output, but visibility varies according to surrounding brightness conditions
Solution Approach 1:
The patent implements dynamic luminance control by introducing two control units that adjust display brightness in real-time based on ambient light conditions and image content characteristics, transforming the static constant luminance system into an adaptive dynamic system
Solution Approach 2:
The system employs feedback mechanisms where the first luminance control unit receives ambient light information and the second luminance control unit analyzes image data, continuously adjusting luminance output to maintain optimal visibility under varying conditions
2Illumination intensity
If the number of pixels emitting light increases or high gray levels are displayed, then the display coverage and brightness are improved, but electric current consumption increases
Solution Approach 1:
The patent changes the operational parameters of the display by dynamically adjusting luminance control signals based on image characteristics, optimizing the balance between display brightness and power consumption through parameter modulation rather than constant high-power operation
Solution Approach 2:
The system applies partial action by selectively controlling luminance enhancement only when and where needed based on image analysis, avoiding excessive power consumption while maintaining sufficient display quality for the actual content being shown
Data Source
AI summary
An organic light emitting display device includes a display area including pixels coupled to scan, light emission control, and data lines; a scan driver electrically coupled to the display area through the scan and light emission control lines; a data driver electrically coupled to the display area through the data lines; an optical sensor for generating a sensor signal corresponding to an ambient light brightness; a first luminance control unit for outputting a first luminance control signal (Vc1) for controlling a gamma-corrected gray level voltage of a data signal in accordance with the sensor signal; a second luminance control unit for outputting a second luminance control signal (Vc2) for controlling a width of a light emission control signal in accordance with data of one frame; and a comparator/selector for comparing the first and second luminance control signals to output one of them into the data driver or the scan driver.