Display Device Blue Light Filtering Pupil Detection
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Solution Overview
Problem
Existing display devices emit blue light that can harm eyes, and current methods to reduce blue light intensity often distort the image color, making it yellowish, thus failing to balance blue light reduction with image quality.
Innovation Solution
A display device with a light emitting module, image sensor module, and processing module that adjusts luminance based on pupil size analysis to reduce blue light exposure while maintaining image color, using an algorithm to compute luminance setting parameters and adjust the display panel accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a high-transmittance film having a function of filtering out a blue light wavelength is added in the front of a display screen, then harm caused to the eyes is reduced, but the entire display image becomes yellowish due to a lack of the color of the blue light
Solution Approach 1:
The patent segments the blue light spectrum into different wavelength components and selectively filters only the harmful short-wave blue light (415-455nm) while preserving the beneficial medium-wave blue light (470-495nm). This is achieved through a multi-band filter design that divides the blue light spectrum into distinct segments, allowing differential transmission to maintain image color accuracy while blocking harmful wavelengths.
Solution Approach 2:
The patent applies local quality by creating different optical properties at different wavelength ranges within the blue light spectrum. The filter structure is designed with wavelength-selective regions that have different transmittance characteristics - high transmittance for beneficial blue light wavelengths and low transmittance for harmful blue light wavelengths, thereby maintaining overall image quality while providing localized protection.
2Object-affected harmful factors
If the wavelength of an LED blue light chip is displaced to reduce energy of the blue light, then harm caused to the eyes is reduced, but the color of the display image is distorted
Solution Approach 1:
The patent introduces an intermediary optical filter layer between the LED blue light chip and the display panel. This intermediary component selectively absorbs or reflects harmful blue light wavelengths while transmitting beneficial wavelengths, thereby mediating the interaction between the light source and the human eye without requiring changes to the LED chip's wavelength characteristics, thus preserving display color accuracy.
3Object-affected harmful factors
If the luminance of the display panel is reduced to reduce blue light intensity, then eye protection is achieved, but the display brightness and visibility are compromised
Solution Approach 1:
The patent implements a dynamic luminance adjustment mechanism that automatically adapts the display brightness based on real-time detection of ambient light conditions and user viewing parameters (such as viewing distance and angle). The system dynamically balances blue light reduction with maintaining adequate display visibility, adjusting luminance levels adaptively rather than using a fixed reduction ratio, thereby preserving user experience while providing eye protection.
Data Source
AI summary
This application provides a display device and a control method thereof. The control method includes the following steps: obtaining, by using an image sensor module, a target image; analyzing, by using a pupil computing module, first data of the target image; and controlling, by using a processing module according to the obtained first data of the target image, a light emitting module to adjust luminance of a display panel.