Ambient Light Adaptive OLED Luminance Control
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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 first luminance control unit and a second luminance control unit that adjust gamma-corrected gray level voltage and light emission control signal width based on ambient brightness, using an optical sensor to generate control signals for dynamic luminance adjustment and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display device emits light with constant luminance regardless of ambient brightness, then the luminance is maintained consistently, but the visibility varies according to surrounding brightness and power consumption increases
Solution Approach 1:
The patent implements dynamic luminance control by introducing a luminance control unit that adjusts the luminance of the display area based on ambient light conditions detected by an optical sensor. The system dynamically modifies the luminance control signal to match ambient brightness levels, thereby reducing power consumption in dark environments while maintaining visibility in bright conditions.
Solution Approach 2:
The patent employs feedback control by using an optical sensor to detect ambient light levels and feed this information back to the luminance control unit. This closed-loop system continuously monitors ambient brightness and adjusts the display luminance accordingly, optimizing the balance between visibility and power consumption.
2Ease of operation
If the display device increases luminance to maintain visibility in bright ambient light, then visibility is improved, but power consumption increases
Solution Approach 1:
The patent changes the luminance parameter of the display based on ambient light conditions. The luminance control unit adjusts the luminance control signal parameter according to the ambient light level detected by the optical sensor, ensuring optimal visibility while minimizing power consumption by adapting to environmental conditions.
3Use of energy by moving object
If the display device reduces luminance in dark ambient light, then power consumption is reduced, but visibility may be insufficient
Solution Approach 1:
The system dynamically adjusts luminance based on real-time ambient light detection. In dark environments, the luminance control unit reduces the luminance control signal to minimize power consumption while the optical sensor ensures that the reduction does not compromise visibility below acceptable thresholds, maintaining an optimal balance between energy savings and display quality.
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 enhances visibility by adapting luminance to ambient brightness, reduces power consumption by limiting excessive light emission, and prevents unnecessary electric current flow, thereby improving display efficiency and reducing power usage.
Implementation Method 1
an optical sensor for generating an optical sensor signal corresponding to a brightness of an ambient light
Data Source
AI summary
An organic light emitting display device includes: a display area including a plurality of pixels coupled to scan, light emission control, and data lines; a scan driver electrically coupled to the display area through the scan lines and the light emission control lines; a data driver electrically coupled to the display area through the data lines; an optical sensor for generating an optical sensor signal corresponding to a brightness of an ambient light; a first luminance control unit for outputting a first luminance control signal for controlling a gamma-corrected gray level voltage of a data signal in accordance with the optical sensor signal, and a second luminance control unit for outputting a second luminance control signal for controlling a width of a light emission control signal in accordance with data of one frame of an image. The first luminance control unit turns the second luminance control unit on and off.