Display Panel Dual Blue Pixel Wavelength Control
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Solution Overview
Problem
Conventional display technologies interfere with sleep by suppressing melatonin secretion due to the use of blue light with a wavelength of 464 nm, which is not effectively differentiated from other blue light wavelengths, leading to disrupted sleep patterns.
Innovation Solution
A display control method and apparatus that utilize two types of blue pixels with different wavelengths, one emitting a first blue light with a center wavelength far from 464 nm and another emitting a second blue light close to 464 nm, allowing for selective display modes to either induce sleep or wake the viewer by controlling which pixel is used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If blue light with wavelength of 464 nm is used for display, then display quality is improved, but melatonin secretion is suppressed leading to disrupted sleep patterns
Solution Approach 1:
The blue pixel is divided into two separate blue pixels with different wavelengths (first blue pixel and second blue pixel). This segmentation allows the display to selectively use different blue light wavelengths depending on the time of day, using the second blue pixel (464 nm) during daytime for optimal display quality and the first blue pixel during nighttime to avoid suppressing melatonin secretion
Solution Approach 2:
The display dynamically switches between different blue pixel configurations based on time of day or user state. The controller selectively activates either the first blue pixel, second blue pixel, or both simultaneously, enabling adaptive adjustment of blue light emission to balance display quality with sleep health considerations
2Ease of operation
If blue light is used to wake up the viewer, then wake-up effect is improved, but sleep induction capability deteriorates
Solution Approach 1:
The display transitions dynamically between different operational modes: during daytime or wake-up scenarios, it activates the second blue pixel (464 nm) to provide alerting effects; during nighttime or sleep scenarios, it switches to the first blue pixel to enable sleep induction mode, thus adapting to different user needs throughout the day
Solution Approach 2:
The display system achieves multi-functionality by incorporating both first and second blue pixels, enabling it to perform both wake-up functions (using second blue pixel) and sleep induction functions (using first blue pixel) within a single display device, eliminating the need for separate devices for different scenarios
3Device complexity
If a single blue pixel is used, then device complexity is reduced, but the ability to differentiate between sleep-friendly and wake-up modes deteriorates
Solution Approach 1:
Instead of using a single blue pixel, the invention segments the blue pixel into two distinct blue pixels with different wavelengths. This segmentation provides the capability to differentiate between sleep-friendly mode (first blue pixel) and wake-up mode (second blue pixel), enabling mode differentiation without requiring complex external filtering or adjustment mechanisms
Solution Approach 2:
Different local qualities are assigned to different blue pixels: the first blue pixel is optimized for sleep-friendly conditions with wavelengths less than 464 nm, while the second blue pixel is optimized for wake-up scenarios with wavelength of 464 nm. This local quality differentiation enables the display to provide tailored light output for different functional modes
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 solution effectively manages melatonin secretion by minimizing sleep interference while providing a wake-up effect, allowing for improved sleep induction and wake-up functionality based on the display mode, thus enhancing user experience and sleep quality.
Implementation Method 1
a first blue pixel emitting a first blue light
Implementation Method 2
a second blue pixel emitting a second blue light having a different wavelength from the first blue light
Data Source
AI summary
A display control method for controlling display of a display panel, the display control method including: obtaining an image by photographing a viewer; determining whether the viewer is sleepy based on the image; controlling a display mode of the display panel based on whether the viewer is sleepy; and generating an output signal for displaying an image on the display panel based on the display mode, wherein the display panel includes a first blue pixel emitting a first blue light and a second blue pixel emitting a second blue light having a different wavelength from the first blue light, and the display mode is classified based on which of the first and second blue pixels are used.