Illumination device

JP7692762B2Active Publication Date: 2025-06-16MAGNOLIA WHITE CORP
5 Cites -1 Cited by

Patent Information

Application Number
JP2021134024
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2021-08-19
Publication Date
2025-06-16
Estimated Expiration
2041-08-19

AI Technical Summary

Technical Problem

Existing lighting devices for transmissive display devices, such as liquid crystal displays, face challenges in achieving accurate local dimming due to the spread of light from one segment to adjacent segments, which affects the precision and effectiveness of local dimming control.

Method used

A lighting device configuration that includes a circuit board with light-emitting elements, a transparent overcoat layer, transparent blocks, and an optical sheet group, where the transparent blocks are arranged to overlap the light-emitting elements and are separated by an air layer, effectively controlling the light distribution and preventing it from spreading to adjacent segments.

Benefits of technology

This configuration enables precise control of light emission, allowing for accurate local dimming by minimizing light spread between segments, thereby enhancing the display's contrast and energy efficiency.

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Abstract

To provide a luminaire which achieves accurate local dimming.SOLUTION: A luminaire includes: a circuit board; a plurality of light emitting elements containing a first light emitting element and a second light emitting element mounted on the circuit board; a transparent overcoat layer for covering the circuit board and the plurality of light emitting elements; a first transparent block arranged on the overcoat layer, and overlapped with the first light emitting element; a second transparent block arranged on the overcoat layer, adjacent to the first transparent block, and overlapped with the second light emitting element; and an optical sheet group arranged on the first transparent block and the second transparent block. A first side surface of the first transparent block and a second side surface of the second transparent block are facing each other via an air layer.SELECTED DRAWING: Figure 4
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Citation Information

Patent Citations

  • Backlight unit and liquid crystal display device equipped with same

    JP2010055999A

  • Liquid crystal display device

    JP2017116683A

  • Light guiding plate, surface light source device, display device, and electronic apparatus

    JP2018101521A

  • Electronic apparatus and display device

    JP2020205183A

  • Polarization selective optic for glare control of illumination lighting

    US10935215B1