Organic Light Emitting Display Adaptive 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 configuration that includes optical sensors, luminance control units, and a scan driver to adjust pixel light emission time based on ambient brightness and image data, reducing power consumption and preventing excessive luminance reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant luminance is maintained regardless of ambient brightness, then visibility consistency is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic luminance control by adjusting the light emission time of pixels based on ambient brightness conditions. The display device transitions from static constant luminance to dynamic adaptive luminance, where the emission duration varies according to environmental light levels and image content requirements
Solution Approach 2:
The patent changes the temporal parameter (light emission time duration) of pixel operation based on ambient brightness conditions. By modifying the emission time parameter rather than maintaining fixed luminance, the system achieves both power savings and visibility consistency across different viewing conditions
2Reliability
If light emission time is extended to maintain visibility in bright environments, then visibility is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts light emission time based on real-time ambient brightness detection. In bright environments, emission time is extended only when necessary for visibility, rather than maintaining constant extended emission, thereby optimizing the balance between visibility and power consumption
Solution Approach 2:
The patent employs feedback mechanisms where ambient brightness sensors provide real-time information to the control system, which then adjusts emission time accordingly. This closed-loop control ensures emission time is extended only to the extent necessary for maintaining visibility, preventing excessive power consumption
3Use of energy by moving object
If luminance is reduced in dark environments, then power consumption is reduced, but visibility consistency deteriorates
Solution Approach 1:
The patent modifies the emission time parameter adaptively based on ambient conditions. In dark environments, the system reduces power consumption by limiting emission time while maintaining sufficient visibility through precise temporal control, rather than maintaining constant luminance levels
Data Source
AI summary
An organic light emitting display device including: an optical sensor for generating an optical sensor signal corresponding to brightness of ambient light; a first luminance control unit for generating a pulse width (EW1) of a brightness control signal in accordance with the optical sensor signal; a second luminance control unit for generating a fluctuated value (EW2) for the pulse width of the brightness control signal in accordance with the optical sensor signal and data of one frame of the image; and a luminance control signal generation unit for generating a luminance control signal (Vc) for controlling a scan driver in accordance with the pulse width of the brightness control signal and the fluctuated value.