Display system and backlight for providing illumination to an image forming device

By using front and rear optical reflectors to separate visible and infrared light in the display, and combining this with a thermal management layer to absorb infrared energy, the thermal management and spectral management issues of UHD and HDR displays are solved, improving brightness and power efficiency.

CN122218984APending Publication Date: 2026-06-163M INNOVATIVE PROPERTIES CO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
3M INNOVATIVE PROPERTIES CO
Filing Date
2020-01-06
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Existing UHD and HDR displays face challenges in thermal and spectral management due to high brightness and high power consumption, especially the unnecessary increase in heat caused by infrared energy.

Method used

An optical cavity is constructed using spaced-out front and rear optical reflectors. The front reflector transmits visible light and reflects infrared light, while the rear reflector reflects visible light and transmits infrared light. The thermal management layer absorbs and dissipates infrared energy, and multilayer optical films and reflective polarizers are used to optimize spectral separation.

Benefits of technology

Effectively manage monitor heat, improve light energy utilization efficiency, reduce unnecessary heat buildup, and enhance monitor brightness and power efficiency.

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Abstract

A backlight for an image forming device includes spaced apart front and rear optical reflectors defining an optical cavity therebetween, at least one light source for emitting light into the optical cavity, and a thermal management layer. The front optical reflector is disposed between the image forming device and the rear optical reflector, substantially transmits light in a first wavelength range toward the image forming device, and substantially reflects light in a second wavelength range toward the rear optical reflector. The rear optical reflector substantially reflects light in the first wavelength range toward the front optical reflector, and substantially transmits light in the second wavelength range. The thermal management layer absorbs at least a portion of light in a third wavelength range. The light in the third wavelength range is emitted by an electronic circuit disposed adjacent to the backlight.
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