Lamp for vehicle
US-12072074-B2 · Aug 27, 2024 · US
Backlight unit and liquid crystal display device
US2020200961A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2020200961-A1 |
| Application number | US-202016808070-A |
| Country | US |
| Kind code | A1 |
| Filing date | Mar 3, 2020 |
| Priority date | Sep 4, 2017 |
| Publication date | Jun 25, 2020 |
| Grant date | — |
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Abstract
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Display performance can be improved by reducing light leak in an oblique direction at the time of black display while increasing front brightness. Provided is a backlight unit including: a light collimating member in which a lens array is formed on one surface of a transparent substrate and a plurality of truncated cones are arranged on another surface of the transparent substrate; a light guide plate; and a light source, in which the truncated cone on the light collimating member has a shape in which a width decreases away from the transparent substrate in a height direction, a position of each of lenses of the lens array deviates from a position of the truncated cone corresponding to the lens to move away from the light source in a direction that connects a center of the lens and the light source most adjacent to the lens, an optical axis of the lens is arranged to pass through a slope of the truncated cone corresponding to the lens, the light guide plate and a surface of the truncated cone opposite to the transparent substrate are in contact with each other, and the shape of the truncated cone of the light collimating member satisfies specific expressions.
First claim
Opening claim text (preview).
What is claimed is: 1 . A backlight unit comprising: a light collimating member in which a lens array is formed on one surface of a transparent substrate and a plurality of truncated cones are arranged on another surface of the transparent substrate; a light guide plate; and a light source, wherein the light collimating member is arranged to face one main surface of the light guide plate, the light source is arranged to face at least one side surface of the light guide plate, the truncated cone on the light collimating member has a shape in which a width decreases away from the transparent substrate in a height direction, a position of each of lenses of the lens array deviates from a position of the truncated cone corresponding to the lens to move away from the light source in a direction that connects a center of the lens and the light source most adjacent to the lens, an optical axis of the lens is arranged to pass through a slope of the truncated cone corresponding to the lens, the light guide plate and a surface of the truncated cone opposite to the transparent substrate are in contact with each other, and a shape of the truncated cone of the light collimating member satisfies the following Expressions 1 to 3, n 2 n 1 ≧ 1.03 Expression 1 θ ave - 10 ° ≦ θ ≦ θ ave + 10 ° Expression 2 0.05 ≦ r R ≦ 0.50 Expression 3 where n 1 represents a refractive index of the light guide plate, n 2 represents a refractive index of the truncated cone, θave represents a value represented by the following Expression 4, m in Expression 4 represents a division number of an incidence angle range of light incident from the light guide plate into the truncated cone, θi represents an i-th incidence angle in a case where the incidence angle range of the light incident from the light guide plate into the truncated cone is divided m times, θ represents an inclination angle of the truncated cone, R represents a radius of the lens on the transparent substrate side, and r represents a radius of the surface of the truncated cone opposite to the transparent substrate θ ave = 1 m ∑ i = 1 m ( 90 1 2 · n 1 n 2
Assignees
Inventors
Classifications
Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction · CPC title
- G02B3/0037Primary
characterized by the distribution or form of lenses · CPC title
of lens shape · CPC title
Diffusing elements; Afocal elements · CPC title
Prism arrays · CPC title
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- What does patent US2020200961A1 cover?
- Display performance can be improved by reducing light leak in an oblique direction at the time of black display while increasing front brightness. Provided is a backlight unit including: a light collimating member in which a lens array is formed on one surface of a transparent substrate and a plurality of truncated cones are arranged on another surface of the transparent substrate; a light guid…
- Who is the assignee on this patent?
- Fujifilm Corp
- What technology area does this patent fall under?
- Primary CPC classification G02B3/0037. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Thu Jun 25 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).