Ambient Light Adaptive Luminance Control for OLED Displays
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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 scan driver, data driver, optical sensor, and luminance control units that adjust pixel light emission time based on ambient brightness and image data, using pulse width modulation to control luminance and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display emits light with constant luminance regardless of ambient brightness, then the display maintains consistent light emission intensity, but the visibility varies according to surrounding brightness and power consumption increases
Solution Approach 1:
The patent implements dynamic luminance control by adjusting the light emission intensity of pixels based on detected ambient brightness levels. The system transitions from static constant luminance to dynamic adaptive luminance, where the display automatically modifies its emission characteristics in response to environmental conditions, thereby reducing power consumption while maintaining visibility.
Solution Approach 2:
The patent employs a feedback mechanism using an optical sensor to detect ambient brightness levels and feed this information back to the control circuitry. This closed-loop system enables the display to automatically adjust luminance based on real-time environmental measurements, optimizing both visibility and power consumption without user intervention.
2Ease of operation
If the display increases light emission to improve visibility in bright environments, then visibility is enhanced, but power consumption increases
Solution Approach 1:
The patent changes the luminance parameter dynamically based on ambient brightness conditions. By adjusting this critical display parameter in response to environmental feedback, the system optimizes visibility for different viewing conditions while avoiding unnecessary power consumption in already-bright environments where high luminance is not required for adequate visibility.
3Illumination intensity
If all pixels emit light at maximum intensity, then the display achieves maximum brightness, but power consumption increases significantly
Solution Approach 1:
The patent applies local quality control by adjusting luminance on a per-pixel or per-region basis rather than uniformly across the entire display. This enables different parts of the display to emit light at intensities appropriate to their specific requirements and ambient conditions, optimizing overall power consumption while maintaining necessary brightness levels where needed.
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 (Ssel) and supplying a selection signal; a second luminance control unit for generating a fluctuated value (EW2) for the pulse width of the brightness control signal in accordance with data of one frame; 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. Here, the second luminance control unit is turned on/off according to the selection signal from the first luminance control unit.