Optical Sensor Light Transmission Member for Display Luminance Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices using backlight assemblies as lighting sources face challenges with non-uniform illumination and intensity, which degrade image quality, particularly in medical applications where precise conditions are critical.
Innovation Solution
Incorporating a light transmission member with a through hole to direct light from the backlight assembly to an optical sensor, allowing for precise detection of luminance and intensity, and using a control unit to adjust PWM frequency for uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a backlight assembly is used as a lighting source, then the display device can provide illumination, but the illumination and intensity become non-uniform over time and surroundings
Solution Approach 1:
The patent applies preliminary action by detecting the luminance of the backlight assembly in advance and storing it in memory before displaying images. The control unit retrieves this pre-detected luminance information to compensate for non-uniformity, ensuring consistent illumination quality without requiring real-time adjustment during operation.
Solution Approach 2:
The patent implements feedback by using an optical sensor to continuously detect the actual luminance output of the backlight assembly. This detected information is fed back to the control unit, which then adjusts the driving signals to the backlight assembly to maintain uniform illumination intensity and compensate for variations over time and environmental conditions.
2Productivity
If the illumination and intensity of the lighting source are non-uniform, then the display device can operate, but the image quality is deteriorated
Solution Approach 1:
The control unit uses feedback from the optical sensor to detect luminance variations and automatically adjusts the backlight assembly's output to maintain uniform illumination. This feedback mechanism ensures that image quality remains high by compensating for any non-uniformity in the lighting source during operation.
Solution Approach 2:
The patent applies parameter changes by adjusting the driving parameters of the backlight assembly based on detected luminance variations. The control unit modifies electrical parameters such as current or pulse width modulation (PWM) duty cycle to maintain consistent luminance output, thereby preserving image quality while allowing continuous operation.
3Measurement precision
If an optical sensor is added to detect luminance, then the luminance can be precisely detected, but the device complexity increases
Solution Approach 1:
The patent introduces a light transmission member as an intermediary component that guides light from the backlight assembly to the optical sensor. This mediator enables precise luminance detection by ensuring that the sensor receives representative light samples, while the overall added complexity remains manageable due to the straightforward optical guiding function.
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
This solution enables precise detection and compensation of luminance and intensity, ensuring consistent image quality and accurate patient condition monitoring in medical displays.
Implementation Method 1
an optical sensor detecting luminance of the light supplied from the lighting source
Data Source
AI summary
Provided is a display device. The display device includes a display module on which a lighting source for supplying light is disposed on a back surface thereof, an optical sensor detecting luminance of the light supplied from the lighting source, and a light transmission member disposed between the lighting source and the optical sensor, the light transmission member providing a transmission path of the light generated in the lighting source to transmit the light into the optical sensor.