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 in varying brightness conditions.
Innovation Solution
An organic light emitting display device with a luminance control system that adjusts gamma-corrected gray level voltage and light emission time based on ambient brightness, using an optical sensor to generate control signals for scan and data drivers, reducing power consumption and preventing excessive luminance reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If constant luminance is maintained regardless of ambient brightness, then display consistency is preserved, but visibility becomes inconsistent and power consumption increases
Solution Approach 1:
The patent applies dynamics by making the luminance control system adjustable based on ambient brightness conditions. The optical sensor detects ambient light levels and dynamically modifies the luminance control signals sent to the display area, allowing the system to transition from constant to variable luminance output according to environmental conditions, thereby resolving the contradiction between stability and adaptability.
Solution Approach 2:
The patent implements feedback through the optical sensor that continuously monitors ambient brightness and provides input signals to the luminance control unit. This feedback loop enables the system to automatically adjust luminance levels based on real-time environmental conditions, maintaining optimal visibility while reducing power consumption without requiring manual intervention.
2Illumination intensity
If luminance is increased to improve visibility in dark environments, then visibility is improved, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by modifying the luminance control parameter based on ambient brightness conditions. The optical sensor detects environmental light levels and the luminance control unit adjusts the control signals accordingly, reducing luminance when ambient light is sufficient and increasing it only when necessary for visibility, thereby optimizing the balance between illumination intensity and power consumption.
Solution Approach 2:
The system dynamically adjusts luminance levels rather than maintaining a fixed high luminance state. The optical sensor continuously monitors ambient conditions and triggers luminance adjustments only when needed, allowing the display to operate at lower power consumption levels during most conditions while providing high luminance output only when ambient darkness requires it for adequate visibility.
3Duration of action of stationary object
If light emission time is extended to improve display quality, then display quality is improved, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by modifying the light emission time parameter based on ambient brightness conditions. The optical sensor detects environmental light levels and the control system adjusts the duration of light emission accordingly, reducing emission time when ambient light is sufficient and extending it only when necessary for adequate display quality in dark environments, thereby optimizing the balance between display quality and power consumption.
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 system enhances visibility by dynamically adjusting luminance according to ambient brightness, reducing power consumption by limiting light emission time and current flow, thereby preventing unnecessary power usage and maintaining optimal display conditions.
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 connected to scan lines, light emission control lines and data lines; a scan driver electrically connected to the display area through the scan lines and light emission control lines; a data driver electrically connected to the display area through the data lines; an optical sensor for generating an optical sensor signal corresponding to the brightness of the ambient light; a first luminance control unit for providing 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 providing a second luminance control signal for controlling a pulse width of the light emission control signal in accordance with the optical sensor signal and the data of one frame.