OLED Display Adaptive Brightness Control for Outdoor Visibility
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Solution Overview
Problem
Organic light emitting displays, particularly active matrix OLEDs, face challenges with low visibility in outdoor high-light conditions due to high power consumption and reduced lifespan when constantly brightened for visibility, as they struggle to adapt to varying lighting environments.
Innovation Solution
An organic light emitting display system that incorporates a photo sensor to detect external light levels, a signal processing unit to determine indoor or outdoor mode, and an emission control driver to adjust the brightness of both object and outline pixels, allowing for adaptive emission control to enhance visibility while minimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display element is constantly kept bright to ensure visibility in outdoor high-light conditions, then visibility is improved, but power consumption increases and lifespan is reduced
Solution Approach 1:
The patent implements dynamic brightness adjustment by introducing a sensor unit that detects external light levels and a signal processing unit that generates control signals to dynamically adjust the emission control driver's output. This allows the display to adapt its brightness in real-time based on environmental conditions, transitioning from a static high-brightness state to a dynamic adjustment mechanism that optimizes power consumption while maintaining visibility.
Solution Approach 2:
The patent establishes a feedback control loop where the sensor unit continuously monitors external light conditions and feeds this information back through the signal processing unit to the emission control driver. This closed-loop system enables the display to automatically adjust its brightness based on actual environmental conditions, preventing unnecessary high power consumption when full brightness is not required for visibility.
2Illumination intensity
If the display element is constantly kept bright to ensure visibility in outdoor high-light conditions, then visibility is improved, but lifespan is reduced
Solution Approach 1:
By implementing dynamic brightness control through the sensor and signal processing units, the display can adjust its emission levels based on actual viewing conditions. This reduces the cumulative stress on the OLED when maximum brightness is not required, thereby extending the operational lifespan of the organic light emitting diodes.
Solution Approach 2:
The feedback mechanism continuously monitors external light conditions and adjusts display brightness accordingly, preventing unnecessary high-intensity operation that would accelerate OLED degradation. This extends the service life of the display element by operating at optimal brightness levels rather than constantly maximum.
3Illumination intensity
If the display increases brightness to improve visibility in outdoor conditions, then visibility is improved, but contrast ratio is reduced
Solution Approach 1:
The dynamic brightness adjustment system allows the display to optimize its emission characteristics based on external light conditions. By adjusting brightness dynamically rather than maintaining constant high output, the system can preserve contrast ratios in varying lighting environments while maintaining adequate visibility.
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 improves outdoor visibility by dynamically controlling pixel emission based on environmental light conditions, reducing power consumption and extending the lifespan of the organic light emitting diodes by optimizing brightness levels.
Implementation Method 1
a sensor unit for outputting an electrical output signal by sensing an external light
Implementation Method 2
the OLED emits light according to the supplied current
Data Source
AI summary
An organic light emitting display and a driving method thereof capable of improving outdoor visibility by controlling the emission of the pixel. In one embodiment, the organic light emitting display includes an organic light emitting display panel; an emission control driver of the organic light emitting display panel; a sensor unit for outputting an electrical output signal by sensing an external light; a signal processing unit for determining an indoor mode or an outdoor mode in accordance with the output signal outputted from the sensor unit; an onscreen display control unit electrically connected to the signal processing unit and for controlling the emission control driver of the organic light emitting display panel; and an onscreen display area comprising a pixel circuit electrically connected to the emission control driver. Here, the pixel circuit of the onscreen display area is controlled by the emission control driver.