KR-102963742-B1 - Back light unit and Display including the same

KR102963742B1KR 102963742 B1KR102963742 B1KR 102963742B1KR-102963742-B1

Abstract

The embodiments relate to a display device comprising a display panel for displaying images, a first backlight unit disposed below the display panel and outputting light, and a second backlight unit interposed between the display panel and the first backlight unit and outputting light, wherein the first backlight unit includes a first light guide plate having first patterns formed protruding from its back surface, and the second backlight unit includes a second conduit plate having second patterns formed protruding from its back surface, and the second patterns are in the shape of an asymmetric pyramid.

Inventors

김성일
김종현
오영민

Assignees

엘지디스플레이 주식회사

Dates

Publication Date: 20260512
Application Date: 20221205

Claims (20)

A first light source package that generates light; A second light source package that generates light and faces the first light source package; and A light guide plate interposed between the first light source package and the second light source package, comprising patterns protruding from the back surface, wherein The above patterns are, First patterns formed in a first region adjacent to the first light source package and having a first inclined surface facing the first light source package; and It includes second patterns formed in a second region adjacent to the second light source package and having a second inclined surface facing the second light source package, The first patterns and the second patterns have a mirrored form based on the dividing line between the first region and the second region, and The cross-sections of the first patterns and the second patterns are asymmetric trapezoids having the inclined plane as a vertical side, and Light incident from the first light source package to the light guide plate is refracted by the first inclined surface of the first patterns and selectively emitted to the upper surface of the first region, A backlight unit in which light incident from the second light source package to the light guide plate is refracted by the second inclined surface of the second patterns and selectively emitted to the upper surface of the second region.
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In paragraph 1, The first region and the second region are regions that are in contact with each other, and The first patterns and the second patterns are arranged adjacent to each other at the boundary of the first region and the second region, a backlight unit.
In paragraph 1, The first region and the second region are regions spaced apart from each other, and a third region is formed between the first region and the second region, and A backlight unit in which the first patterns and the second patterns are spaced apart from each other.
In Paragraph 7, A backlight unit further comprising a third light source package disposed on one side of the third region.
In paragraph 7, the above patterns are, A backlight unit comprising third patterns formed in the third region and having a third inclined surface facing the first light source package or the second light source package.
In Paragraph 9, A backlight unit in which the angle of inclination of the third inclined surface is smaller than the angle of inclination of the first inclined surface and the second inclined surface.
In paragraph 1, A backlight unit further comprising dome-shaped fourth patterns protruding from the upper surface of the light guide plate.
In paragraph 1, The light guide plate is a backlight unit in which the thickness of the edge adjacent to the first light source package and the second light source package is greater than the thickness of the central region.
A display panel that displays an image including pixels; A first backlight unit positioned at the bottom of the above-mentioned display panel and emitting light to the above-mentioned display panel; A second backlight unit disposed below the first backlight unit; and A light path control pattern disposed between the first backlight unit and the second backlight unit, comprising a light-blocking pattern to control the light emission angle to a narrow angle, wherein The above-mentioned first backlight unit is, A first light source package that generates light; A second light source package that generates light and faces the first light source package; and It includes a first light guide plate interposed between the first light source package and the second light source package, and having patterns protruding from the back surface. The above patterns are, First patterns formed in a first region adjacent to the first light source package and having a first inclined surface facing the first light source package; and It includes second patterns formed in a second region adjacent to the second light source package and having a second inclined surface facing the second light source package, The first patterns and the second patterns have a mirrored form based on the dividing line between the first region and the second region, and The cross-sections of the first patterns and the second patterns are asymmetric trapezoids having the inclined plane as a vertical side, and Light incident from the first light source package to the light guide plate is refracted by the first inclined surface of the first patterns and selectively emitted to the upper surface of the first region, A display device in which light incident from the second light source package to the light guide plate is refracted by the second inclined surface of the second patterns and selectively emitted to the upper surface of the second region.
In Paragraph 13, A third light source package that generates light; and A display device further comprising a second light guide plate disposed on one side of the third light source package.
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In Paragraph 14, A display device in which light incident from the third light source package to the second light guide plate is emitted to the upper surface of the second light guide plate, and the emitted light is emitted at a narrow angle in the first region and the second region through the light path control pattern.
In Paragraph 14, A third region is formed between the first region and the second region, and The above-mentioned first backlight unit is, A display device further comprising a fourth light source package disposed on one side of the third region.
In Paragraph 17, A display device in which light incident from the fourth light source package to the first light guide plate is emitted from the third region to the upper surface of the first light guide plate.
In Clause 14, the above patterns are, A display device comprising third patterns formed in a third region between the first region and the second region, and having a third inclined surface facing the first backlight unit or the second backlight unit.
In Paragraph 19, A display device in which the angle of inclination of the third inclined surface is smaller than the angle of inclination of the first inclined surface and the second inclined surface.

Description

Backlight unit and display including the same The present invention relates to a backlight unit and a display device including the same. As the information society advances, various types of display devices are being developed. Recently, various display devices such as Liquid Crystal Displays (LCDs), Plasma Display Panels (PDPs), and Organic Light Emitting Displays (OLEDs) are being utilized. Conventional display devices do not limit the viewing angle. However, due to reasons such as privacy and information protection, there is a recent demand to restrict the viewing angle of display devices. For example, in the case of display devices used as information media inside a vehicle, while they provide high-definition video to a passenger in the front seat, it is necessary to limit the viewing angle for the driver to ensure driving safety. FIG. 1 is a cross-sectional view of a display device according to one embodiment. FIG. 2 is a rear perspective view schematically showing the structure of a first light guide plate according to one embodiment. FIG. 3 is a cross-sectional view schematically showing the structure of a first backlight unit according to one embodiment. FIGS. 4 to 7 are cross-sectional views illustrating various modes of a display device according to one embodiment. FIG. 8 is a cross-sectional view schematically showing the structure of a first backlight unit according to another embodiment. FIG. 9 is a perspective view schematically showing the structure of a first backlight unit according to another embodiment. FIG. 10 is a cross-sectional view schematically showing the structure of a first backlight unit according to another embodiment. FIGS. 11 to 16 are cross-sectional views illustrating various modes of a display device according to another embodiment. FIG. 17 is a cross-sectional view schematically showing the structure of a first backlight unit according to another embodiment. Hereinafter, embodiments are described with reference to the drawings. In this specification, where a component (or region, layer, part, etc.) is described as being "on," "connected," or "joined" to another component, it means that it may be directly connected/joined to the other component or that a third component may be placed between them. Identical reference numerals denote identical components. Additionally, in the drawings, the thicknesses, proportions, and dimensions of the components are exaggerated for the effective illustration of the technical content. "And/or" includes all of one or more combinations that the associated components may define. Terms such as "first," "second," etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present embodiments, the first component may be named the second component, and similarly, the second component may be named the first component. A singular expression includes a plural expression unless the context clearly indicates otherwise. Terms such as "below," "lower side," "above," and "upper side" are used to describe the relationships between the components depicted in the drawings. These terms are relative concepts and are described based on the directions indicated in the drawings. Terms such as "include" or "have" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. FIG. 1 is a cross-sectional view of a display device according to one embodiment. FIG. 2 is a rear perspective view schematically showing the structure of a first light guide plate shown in FIG. 1, and FIG. 3 is a cross-sectional view schematically showing the structure of a first backlight unit shown in FIG. 1. Referring to FIG. 1, a display device (1) according to one embodiment may include a display panel (110) that displays an image including pixels, and first and second backlight units (120, 130) disposed below the display panel (110) and emitting light toward the front of the display panel (110). Although not illustrated, the display device (1) may further include a panel guide, a top case, a bottom cover, etc., for housing and fixing the display panel (110) and the first and second backlight units (120, 130). The display panel (110) is a liquid crystal panel and may include a lower substrate and an upper substrate bonded together so as to face each other, and a liquid crystal layer interposed between the substrates. The lower substrate may include gate lines and data lines arranged to intersect each other, and liquid crystal cells formed in the intersection area of the gate lines and data lines. In one embodiment, the liquid crystal cells may be ar