KR20230088167A - Light guide plate using hybrid pattern and display device including the same - Google Patents

Abstract

The present invention relates to a light guide plate using a hybrid pattern and a display device including the same, wherein a plurality of dot patterns for dispersing light incident from a side light incident surface to the front surface are densely formed in a predetermined number on the surface facing the front surface. It is a light guide plate including light dispersion dots provided between the dot groups of the dot group and the separation space of the dot groups to disperse the light source incident between each dot group in multiple directions so that light can reach the liquid crystal screen uniformly, and mass-produced a large light guide plate. It is possible to improve display quality and productivity by minimizing visual defects.

Description

Light guide plate using hybrid pattern and display device including the same

The present invention relates to a light guide plate using a hybrid pattern and a display device including the same, and more particularly, to a technique for minimizing visibility of defects in the light guide plate by increasing light dispersion.

As the technology of modern society is advanced, display devices commonly seen in daily life face market demands for larger and thinner displays.

As conventional CRT (Cathode-ray tube) devices do not sufficiently satisfy these demands, PDP (Plasma Display Panel) devices, LCD (Liquid Crystal Display) devices, OLED (Organic Light-Emitting Diode) devices, etc. Demand for a representative flat panel display device is explosively increasing.

A liquid crystal display (LCD) is one of the most widely used flat panel displays (FPD), and consists of two substrates on which electrodes are formed and a liquid crystal layer inserted therebetween. It is a device that displays an image by adjusting the amount of transmitted light by rearranging the liquid crystal molecules of the liquid crystal layer by applying a .

In general, a display such as a liquid crystal display (LCD) uses a two-dimensional light source that transmits light emitted from a one-dimensional light source to a light guide plate and then transmits through one surface thereof. At this time, the efficiency of the surface light source is the overall efficiency of the display device. It is emerging as an important factor in determining performance.

The efficiency of light in a conventional liquid crystal display (LCD) is about 3 to 10%, and light loss mainly occurs in a light guide plate, a polarizer, and a color filter.

Therefore, displays are being developed in a direction capable of reducing manufacturing costs while minimizing the loss of light.

However, there is a tendency for diffusion sheets, prism sheets, and DBEF (Dual Brightness Enhancement Film) sheets installed on the light guide plate to be integrated or detached. Accordingly, the visibility of the crystals in the light guide plate is gradually increasing.

As the pattern formation method of the light guide plate has changed to the roll stamping method, the size of the pattern is formed very finely in preparation for defects, and the vulnerability of the light guide plate to defects has increased.

The visibility of such excessive defects may increase the defect rate of the light guide plate, reduce the efficiency of the assembly process, and deteriorate the image quality of the display.

A conventional backlight device may include a light guide plate, a reflective sheet installed under the light guide plate, a QD sheet installed above the light guide plate, a diffusion sheet, a prism sheet, a DBED sheet, and a light source installed on one side of the light guide plate.

Here, the light guide plate is made of PMMA (Poly Methylmethacrylate), MS (Methylmethacrlate Styrens), PS (Poly Styrene), PC (Poly Carbonate), PET (polyethylene terephthalate), etc. It can be made of the same plastic or resin.

In addition, the light guide plate includes a pattern of a predetermined shape on one side of the inside. In the pattern, a plurality of circular, elliptical, and vertical bar patterns are formed at regular or random intervals in the horizontal and vertical directions of light emitted from an external light source.

After the light emitted from the external light source is incident on the light guide plate, a part of it is emitted to the outside of the light guide plate by the pattern, but some defects play a role similar to the pattern and are likewise emitted to the outside. A part of the light emitted by the defect is emitted as light having a higher intensity than the pattern, so that a light non-uniformity region that is noticeable in a backlight requiring a uniform surface light source as a whole can be visually recognized.

Due to this, the prior art has a problem in that a partial area of the liquid crystal screen is brightened due to a non-uniformity phenomenon generated from the defect, so that the overall appearance is not uniform.

Korea Patent Registration No. 10-1158524 (2012.06.21)

The present invention can provide a light guide plate using a hybrid pattern capable of minimizing non-uniform visibility formed as defects by densely controlling existing patterns formed on the light guide plate and a display device including the same.

In the light guide plate using a hybrid pattern according to one aspect of the present invention, a dot pattern for dispersing light incident from a light incident surface on a side surface to the front surface is densely formed in a predetermined number on a surface facing the front surface, and the light incident surface a plurality of dot groups provided in any one of a precise arrangement having the same spacing in the horizontal and vertical directions and a random arrangement in which the spacing is random; and light dispersion dots provided between the spaced apart spaces of the dot groups to multi-directionally disperse light sources incident between the respective dot groups.

Preferably, the light dispersion dots may be equally spaced in one direction.

Preferably, the light dispersion dots may be formed at random positions.

Preferably, the light dispersion dots are collinear in one direction, but spaced apart from each other may be randomly formed.

Preferably, the light dispersion dots may be zigzag with each other in one direction.

Preferably, the light dispersion dots may disperse the incident light source at a wider angle than the dot pattern.

Preferably, the dot groups and light dispersion dots may be formed by any one of a printing technique, an injection technique, an imprinting technique, a laser processing technique, a V-cutting technique, and a stamp technique.

Preferably, the dot groups and the light dispersion dots may be formed in any one of a polygonal shape, a circular shape, and an elliptical shape.

Preferably, the distribution density of the light dispersion dots may be changed in each direction.

Preferably, it may be a display device including a light guide plate using a hybrid pattern.

According to the present invention, by controlling the pattern formed on the light guide plate, the light can reach the liquid crystal screen uniformly, and the quality and productivity of the display can be improved by minimizing defects in mass production of the large light guide plate.

1 is a configuration diagram illustrating a light guide plate using a hybrid pattern according to an exemplary embodiment.
2 is a diagram schematically illustrating a light dispersion principle according to an exemplary embodiment.
3 is a first cross-sectional view of a light guide plate in which dot groups are precisely arranged according to an exemplary embodiment.
4 is a second cross-sectional view of a light guide plate in which dot groups are precisely arranged according to an exemplary embodiment.
5 is a third cross-sectional view of a light guide plate in which dot groups are precisely arranged according to an exemplary embodiment.
6 is a first cross-sectional view of a light guide plate in which dot groups are randomly arranged according to an exemplary embodiment.
7 is a second cross-sectional view of a light guide plate in which dot groups are randomly arranged according to an exemplary embodiment.
8 is a third cross-sectional view of a light guide plate in which dot groups are randomly arranged according to an exemplary embodiment.
9 is a first cross-sectional view of a light guide plate in which dot groups are arranged in precise and random arrangements according to an exemplary embodiment.
10 is a second cross-sectional view of a light guide plate in which dot groups are arranged in precise and random arrangements according to an exemplary embodiment.
11 is a third cross-sectional view of a light guide plate in which dot groups are arranged in precise and random arrangements according to an exemplary embodiment.
12 is a diagram illustrating an appearance state of a light guide plate to which an arrangement of dot groups and light dispersion dots according to an exemplary embodiment is applied.

Hereinafter, a light guide plate using a hybrid pattern according to the present invention and a display device including the same will be described in detail with reference to the accompanying drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to an operator's intention or practice. Therefore, definitions of these terms will have to be made based on the content throughout this specification.

The objects and effects of the present invention can be naturally understood or more clearly understood by the following description, and the objects and effects of the present invention are not limited only by the following description. In addition, in describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

1 is a configuration diagram illustrating a light guide plate using a hybrid pattern according to an exemplary embodiment.

As shown in FIG. 1 , a light guide plate 100 using a hybrid pattern according to an exemplary embodiment may include a dot group 20 and light dispersion dots 30 .

The dot group 20 may be formed by densely concentrating a predetermined number of dot patterns 10 on a surface facing the front surface to disperse the light source 40 incident from the light incident surface on the side to the front surface.

The light dispersion dots 30 are provided between the spaced apart spaces of the dot groups 20 and can disperse the light sources 40 incident between the respective dot groups 20 in multiple directions.

Here, the light dispersion dots may be equally spaced in one direction, may be formed at random positions, and may be formed on the same line in one direction, but spaced apart randomly. In this case, the light dispersion dots 30 may be zigzag with each other in one direction.

In addition, the light dispersion dots 30 can disperse the incident light source 40 at a wider angle than the dot pattern 10, and the distribution density of the light dispersion dots 30 can be changed in each direction.

The dot group 20 and the light dispersion dots 30 may be formed by any one of a printing technique, an injection technique, an imprinting technique, a laser processing technique, a V-cutting technique, and a stamp technique, and the dot group 20 And the light dispersion dots 30 may be formed in any one of polygonal, circular, and elliptical shapes, but each dot group 20 and the light dispersion dots 30 are not necessarily limited to the above-described technique and shape.

A display device including the light guide plate 100 having the aforementioned characteristics may be manufactured, and specific components of the display device are not limited.

2 is a diagram schematically illustrating a light dispersion principle according to an exemplary embodiment.

As shown in FIG. 2, according to the light dispersion principle according to an embodiment, the light source 40 incident from the side is incident by the dot pattern 10 provided on one side of the light guide plate 100. can be distributed in either direction. At this time, as the degree of dispersion of the light source 40 increases proportionally as the density of the dot pattern 10 increases, the amount of light emitted to the front portion where the dot group 20 in which the dot pattern 10 is densely located increases. . However, even if the amount of light emitted from the front portion where the dot group 20 is located increases, the amount of light emitted from the light source 40 may decrease by the distance between the dot groups 20 .

3 to 5 are cross-sectional views illustrating the light dispersion dots 30 arranged by arrangement in the light guide plate 100 in which the dot groups 20 are precisely arranged according to an exemplary embodiment.

3 is a first cross-sectional view of a light guide plate in which dot groups are precisely arranged according to an exemplary embodiment.

As shown in FIG. 3 , in the light guide plate 100 in which the dot groups 20 are precisely arranged according to an embodiment, the dot groups 20 are equally spaced apart, but the light source 40 is incident on the surface. As a reference, potting soil groups provided at equal intervals in each longitudinal direction may be provided in a zigzag form.

In this case, the light dispersion dots 30 may be provided at equal intervals between each dot group 20 provided in the longitudinal direction. The spaced intervals of the light dispersion dots 30 may be changed, and even if they are provided with a change, they may be equally spaced. In addition, in the light guide plate 100 in which the dot groups 20 are precisely arranged according to an embodiment, between the dot groups 20 provided at equal intervals in each longitudinal direction based on the surface on which the light source 40 is incident, The light dispersion dots 30 are provided, but are not limited thereto, and the light dispersion dots 30 may be provided between spaced apart spaces of each dot group 20 .

4 and 5 will be described based on the light guide plate 100 in which the dot groups 20 of the first cross-sectional view described in FIG. 3 are precisely arranged.

4 is a second cross-sectional view of a light guide plate in which dot groups are precisely arranged according to an exemplary embodiment.

As shown in FIG. 4 , in the light guide plate 100 in which the dot groups 20 are precisely arranged according to an embodiment, the dot groups 20 are equally spaced apart, and the light dispersion dots 30 are each dot. It may be provided at random intervals between the groups 20 .

5 is a third cross-sectional view of a light guide plate in which dot groups are precisely arranged according to an exemplary embodiment.

As shown in FIG. 5 , in the light guide plate 100 in which the dot groups 20 are precisely arranged according to an exemplary embodiment, the dot groups 20 are equally spaced apart, and the light dispersion dots 30 are arranged in the vertical direction. It is provided on the same line between each dot group 20 provided, but the spacing may be provided in a random form.

In this case, the random spacing of the light dispersion dots 30 may be randomly adjusted after a predetermined number of patterns. In addition, the number of light dispersion dots 30 provided on the same line in the horizontal direction based on the light incident surface, but provided at random intervals, is set to determine the spacing between the light dispersion dots 30 provided in each horizontal direction. can be set

6 to 8 are cross-sectional views of each arrangement of the light dispersion dots 30 in the light guide plate 100 in which the dot groups 20 are randomly arranged according to an exemplary embodiment.

6 is a first cross-sectional view of a light guide plate in which dot groups are randomly arranged according to an exemplary embodiment.

As shown in FIG. 6 , in the light guide plate 100 in which the dot groups 20 are randomly arranged according to an exemplary embodiment, the spacing between the respective dot groups 20 may be randomly provided. In this case, the light dispersion dots 30 may be provided at equal intervals in each longitudinal direction based on the surface on which the light source 40 is incident. At this time, the light dispersion dots 30 provided on the same line in one direction may be discontinuously arranged by the randomly provided dot groups 20 .

7 and 8 will be described based on the light guide plate 100 in which the dot groups 20 of the first cross-sectional view described in FIG. 6 are randomly arranged.

7 is a second cross-sectional view of a light guide plate in which dot groups are randomly arranged according to an exemplary embodiment.

As shown in FIG. 7 , in the light guide plate 100 in which the dot groups 20 are randomly arranged according to an exemplary embodiment, the spacing between the respective dot groups 20 is provided at random, and the dot groups 20 are spaced apart at random. Separation intervals of the provided light dispersion dots 30 may be provided randomly.

8 is a third cross-sectional view of a light guide plate in which dot groups are randomly arranged according to an exemplary embodiment.

As shown in FIG. 8 , in the light guide plate 100 in which the dot groups 20 are randomly arranged according to an exemplary embodiment, the dot groups 20 may be spaced at random intervals. In this case, the light dispersion dots 30 are provided on the same line in the longitudinal direction with respect to the surface on which the light source 40 is incident, and the distances between the light dispersion dots 30 may be randomly provided.

In this case, the random spacing of the light dispersion dots 30 may be randomly adjusted after a predetermined number of patterns. In addition, the number of light dispersion dots 30 provided on the same line in the horizontal direction based on the light incident surface, but provided at random intervals, is set to determine the spacing between the light dispersion dots 30 provided in each horizontal direction. can be set

9 to 11 are cross-sectional views of each arrangement of the light dispersion dots 30 in the light guide plate 100 in which the dot groups 20 are arranged in precise and random arrangements according to an exemplary embodiment.

9 is a first cross-sectional view of a light guide plate in which dot groups are arranged in precise and random arrangements according to an exemplary embodiment.

As shown in FIG. 9 , in the light guide plate 100 in which dot groups 20 are arranged in precise and random arrangements according to an embodiment, the first and second rows are grouped into a first row group 51 and a third Rows and the fourth row may be grouped into the second row group 52 and the arrangement of the dot groups 20 may be changed for each row group 50 .

That is, if the first row and the second row of the first row group 51 according to an embodiment are precise arrangements, the third row and fourth row of the second row group 52 may be random arrangements. The precise arrangement of the rows and the second row may be equally spaced, but the arrangement of each row may be zigzag, and the random arrangement of the third and fourth rows may be on the same line with respect to each row or the spacing of the dot groups 20 This may be provided randomly.

In this case, the light dispersion dots 30 may be provided at regular intervals in one direction between each row and each row group 50 . In addition, the light dispersion dots 30 may have a zigzag arrangement of each of the light dispersion dots 30 provided in one direction.

10 and 11 will be described based on the light guide plate 100 provided with the dot groups 20 of the first cross-sectional view described in FIG. 9 in precise and random arrangements.

10 is a second cross-sectional view of a light guide plate in which dot groups are arranged in precise and random arrangements according to an exemplary embodiment.

As shown in FIG. 10 , in the light guide plate 100 in which dot groups 20 are arranged in precise and random arrangements according to an embodiment, as described above, each row group 50 is arranged in precise and random arrangements. It is provided in one form, and the light dispersion dots 30 may be randomly provided between or around each row and each row group 50 .

11 is a third cross-sectional view of a light guide plate in which dot groups are arranged in precise and random arrangements according to an exemplary embodiment.

As shown in FIG. 11 , in the light guide plate 100 in which the dot groups 20 are arranged in precise and random arrangements according to an embodiment, each row group 50 is provided in either a precise arrangement or a random arrangement. In addition, the light dispersion dots 30 are provided in one direction between each row and each row group 50, and the distance between each light dispersion dot 30 may be provided at random.

12 is a diagram illustrating an appearance state of a light guide plate to which an arrangement of dot groups and light dispersion dots according to an exemplary embodiment is applied.

As shown in FIG. 12, the appearance state of the light guide plate 100 to which the arrangement of the dot groups 20 and the light dispersion dots 30 according to an embodiment is applied is (a) the light guide plate 100 to which the general dot pattern 10 is applied. ), and (b) shows the light guide plate 100 to which the hybrid pattern is applied. Here, as the light guide plate 100 to which the hybrid pattern is applied disperses more light sources 40, it can be seen that the defect A1 and the scratch A2 have disappeared.

Although the present invention has been described in detail through representative embodiments, those skilled in the art will understand that various modifications are possible to the above-described embodiments without departing from the scope of the present invention. will be. Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, and should be defined by all changes or modified forms derived from the claims and equivalent concepts as well as the claims to be described later.

100: light guide plate 10: dot pattern
20: dot group 30: light dispersion dot
40: light source 50: row group
51: first row group 52: second row group
A1: Flaws A2: Scratches

Claims (10)

Dot patterns for dispersing light incident from the light incident surface on the side to the front surface are formed densely in a predetermined number on the surface facing the front surface, and the spacing is the same in the horizontal and vertical directions based on the light incident surface A plurality of dot groups provided in any one of a precise arrangement and a random arrangement with a random spacing; and
A light guide plate using a hybrid pattern including light dispersion dots provided between spaces between the dot groups and dispersing light incident between each dot group in multiple directions.
According to claim 1,
The light guide plate using a hybrid pattern, characterized in that the light dispersion dots are equally spaced in one direction.
According to claim 2,
The light guide plate using a hybrid pattern, characterized in that the light dispersion dots are zigzag with each other in one direction.
According to claim 1,
The light guide plate using a hybrid pattern, characterized in that the light dispersion dots are formed at random positions.
According to claim 1,
The light guide plate using a hybrid pattern, characterized in that the light dispersion dots are collinear in one direction but spaced apart at random.
According to claim 1,
The light-dispersion dot is a light guide plate using a hybrid pattern, characterized in that the incident light is dispersed at a wider angle than the dot pattern.
According to claim 1,
The light guide plate using a hybrid pattern, characterized in that the dot group and the light dispersion dots are formed by any one of a printing technique, an injection technique, an imprinting technique, a laser processing technique, a V-cutting technique, and a stamp technique.
According to claim 1,
The light guide plate using a hybrid pattern, characterized in that the dot group and the light dispersion dot are formed in any one of a polygonal shape, a circular shape, and an elliptical shape.
According to claim 1,
The light guide plate using a hybrid pattern, characterized in that the distribution density of the light dispersion dots is changed in each one direction.
A display device comprising a light guide plate using the hybrid pattern according to any one of claims 1 to 9.

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