Photo Sensor Light Incidence Layers for OLED Brightness Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional organic light emitting displays have a predetermined brightness range that is unaffected by external light conditions, leading to reduced contrast and increased power consumption, as they do not adjust brightness based on external luminance.
Innovation Solution
A photo sensor with a light incidence unit having multiple layers of varying transmittance and a photo sensing unit with elements that output electrical signals based on light intensity, allowing for dynamic adjustment of brightness in response to external light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional OLEDs operate with a predetermined brightness range, then the display structure is simple, but the contrast is reduced and image visibility is deteriorated
Solution Approach 1:
The photo sensing unit is divided into multiple photo sensing elements (first photo sensing element, second photo sensing element, etc.), each responsible for detecting different light intensity ranges. This segmentation allows the system to accurately detect varying external luminance levels and adjust brightness accordingly, improving contrast without significantly complicating the overall display structure.
Solution Approach 2:
The display system transitions from a fixed predetermined brightness range to a dynamic brightness adjustment mechanism. The brightness output is dynamically controlled based on detected external luminance levels, allowing the display to adapt to different lighting conditions (high external luminance, low external luminance) and maintain optimal contrast and image visibility.
2Ease of operation
If conventional OLEDs use a predetermined brightness range, then the device is easy to operate, but power consumption is increased
Solution Approach 1:
A feedback mechanism is implemented where photo sensing elements detect external luminance levels and provide signals to control the brightness output of the OLEDs. This automatic feedback loop eliminates the need for manual brightness adjustment, maintaining ease of operation while optimizing power consumption by adapting brightness to actual viewing conditions.
Solution Approach 2:
The brightness parameter of the OLEDs is dynamically changed based on detected external luminance conditions. The system adjusts the brightness output parameter according to environmental lighting levels, reducing power consumption in bright conditions and maintaining visibility in dark conditions, all while requiring minimal user intervention.
3Measurement precision
If multiple photo sensing elements are used with varying light transmittance, then light sensitivity is improved, but device complexity increases
Solution Approach 1:
Different light incidence layers are assigned different local qualities in terms of light transmittance. The first light incidence layer, second light incidence layer, etc., have varying transmittance characteristics that correspond to different photo sensing elements. This local differentiation enables each photo sensing element to detect specific light intensity ranges effectively, improving overall light sensitivity while maintaining a structured and manageable photo sensor design.
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
Enhances light sensitivity and accuracy in measuring external light intensity, enabling precise control of brightness and reducing power consumption by turning on/off photo sensing elements based on threshold currents, thereby improving image visibility and OLED lifespan.
Implementation Method 1
a light incidence unit with a plurality of light incidence layers, the light incidence unit having a varying light transmittance with respect to external light
Implementation Method 2
a photo sensing unit with a plurality of photo sensing elements, the photo sensing unit being configured to output electrical signals in accordance with an amount of light transmitted through the light incidence unit
Data Source
AI summary
A photo sensor includes a light incidence unit including a plurality of light incidence layers, the light incidence unit having a varying light transmittance with respect to external light, and a photo sensing unit including a plurality of photo sensing elements, the photo sensing unit being configured to output electrical signals in accordance with an amount of light transmitted through the light incidence unit to determine intensity of the external light, each of the photo sensing elements being configured to output electrical signals in accordance with light transmitted through a respective light incidence layer.