KR102643313B1 - 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 that disperse light incident from a side light incident surface to the front are densely formed in a predetermined number on the front surface. A light guide plate containing light dispersion dots provided between the dot groups and the space between the dot groups to disperse the light source incident between each dot group in multiple directions allows light to reach the liquid crystal screen evenly, and mass-produces a large light guide plate. Display quality and productivity can be improved by minimizing visual defects.

Description

Light guide plate using hybrid pattern and display device including same {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 specifically, to a technology that minimizes visibility of defects in the light guide plate by increasing light dispersion.

As the technology of modern society advances, display devices commonly found in daily life are facing market demands for larger and thinner displays.

As conventional CRT (Cathode-ray tube) devices do not sufficiently meet these demands, PDP (Plasma Display Panel) devices, LCD (Liquid Crystal Display) devices, and OLED (Organic Light-Emitting Diode) devices are used. Demand for representative flat panel display devices is growing explosively.

Liquid crystal display (LCD) is one of the most widely used flat panel displays (FPD). It consists of two substrates with electrodes and a liquid crystal layer inserted between them, and a voltage is applied to the electrodes. It is a device that displays images by adjusting the amount of light transmitted by rearranging the liquid crystal molecules in the liquid crystal layer by applying .

Generally, displays such as liquid crystal displays (LCDs) use a two-dimensional light source that causes light emitted from a one-dimensional light source to enter the light guide plate and then transmit through one surface. In this case, the efficiency of the surface light source determines the overall performance of the display device. It is emerging as an important factor in determining performance.

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

Accordingly, the development of displays is progressing in a way that can reduce manufacturing costs while minimizing light loss, and in particular, the development of light guide plates that effectively transmit light to the front is actively progressing.

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

As the pattern forming method of the light guide plate changed to the roll stamping method, the size of the pattern was formed very finely to compensate for defects, and the vulnerability of the light guide plate to defects increased.

The visibility of these excessive defects can increase the defect rate of the light guide plate, reducing the efficiency of the assembly process and deteriorating the image quality of the display.

A conventional backlight device may include a light guide plate, a reflective sheet installed below the light guide plate, a QD sheet installed on the top of 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 acrylic transparent resin, such as PMMA (Poly Methylmethacrylate), MS (Methylmethacrlate Styrens), PS (Poly Styrene), PC (Poly Carbonate), PET (polyethylene terephthalate), etc., which are transparent materials that can transmit light. It can be made of the same plastic or resin.

Additionally, the light guide plate includes a pattern of a predetermined shape on one side of the interior. The pattern is formed in the horizontal and vertical directions of light emitted from an external light source, with a plurality of circular, oval, and vertical bar-shaped patterns formed at regular or random intervals.

After the light emitted from an external light source enters the light guide plate, some of it is emitted outside the light guide plate due to the pattern, but some defects play a role similar to the pattern and are also emitted outside the light guide plate. Some of the light emitted by the defect is emitted as light with a greater intensity than the pattern, so that noticeable uneven areas of light can be seen with the naked eye in a backlight that requires an overall uniform surface light source.

Because of this, the prior art has a problem in that some local areas of the liquid crystal screen are brightened due to non-uniformity occurring from defects, making it impossible to display an overall uniform appearance.

Korean Patent Publication No. 10-1158524 (2012.06.21)

The present invention can provide a light guide plate using a hybrid pattern that can minimize uneven visibility caused by defects by controlling the position of existing patterns formed on the light guide plate by condensing them, and a display device including the same.

A light guide plate using a hybrid pattern according to an aspect of the present invention is formed with a predetermined number of dot patterns that disperse the light source incident from the light incident surface on the side to the front surface in a dense manner on the surface opposite to the front surface, and the light incident surface is A plurality of dot groups arranged in either a precise arrangement with the same spacing in the horizontal and vertical directions as a standard or a random arrangement with a random spacing; And it may include a light dispersion dot provided between the space between the dot groups to disperse the light source incident between each dot group in multiple directions.

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

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

Preferably, the light dispersing dots may be formed on the same line in one direction but spaced apart from each other at random.

Preferably, the light dispersing 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 group 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 stamping technique.

Preferably, the dot group and light dispersion dots may be formed in any one of polygonal, circular, and oval shapes.

Preferably, the distribution density of the light dispersing dots can 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 adjusting the pattern formed on the light guide plate, light can reach the liquid crystal screen uniformly and the quality and productivity of the display can be improved by minimizing defects when mass producing a large light guide plate.

Figure 1 is a configuration diagram showing a light guide plate using a hybrid pattern according to an embodiment.
Figure 2 is a diagram schematically showing the principle of light dispersion according to one embodiment.
Figure 3 is a first cross-sectional view of a light guide plate in which dot groups are precisely arranged according to an embodiment.
Figure 4 is a second cross-sectional view of a light guide plate in which dot groups are precisely arranged according to an embodiment.
Figure 5 is a third cross-sectional view of a light guide plate in which dot groups are precisely arranged according to an embodiment.
Figure 6 is a first cross-sectional view of a light guide plate in which dot groups are randomly arranged according to an embodiment.
Figure 7 is a second cross-sectional view of a light guide plate in which dot groups are randomly arranged according to an embodiment.
Figure 8 is a third cross-sectional view of a light guide plate in which dot groups are randomly arranged according to an embodiment.
Figure 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 embodiment.
Figure 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 embodiment.
Figure 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 embodiment.
Figure 12 is a diagram showing the external appearance of a light guide plate to which an arrangement of a dot group and light dispersion dots is applied according to an embodiment.

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 attached drawings. In this process, the thickness of lines or sizes of components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are terms defined in consideration of functions in the present invention, and may vary depending on the operator's intention or custom. Therefore, definitions of these terms should be made based on the content throughout this specification.

The purpose and effect of the present invention can be naturally understood or become clearer through the following description, and the purpose and effect of the present invention are not limited to the following description. Additionally, in describing the present invention, if it is determined that a detailed description of known techniques related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

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

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

The dot group 20 may be formed with a predetermined number of dot patterns 10 that disperse the light source 40 incident from the side light incident surface to the front surface and are densely packed on the surface opposite to the front surface.

The light dispersion dots 30 are provided between the spaces between the dot groups 20 and can disperse the light source 40 incident between each dot group 20 in multiple directions.

Here, the light dispersion dots may be equally spaced in one direction, may be formed at random positions, or may be formed on the same line in one direction but spaced apart at random. At this time, the light dispersion dots 30 may be zigzag to each other in one direction.

Additionally, the light dispersion dots 30 may be dispersed at a wider angle than the dot pattern 10 at which the incident light source 40 is applied, and the distribution density of the light dispersion dots 30 may be changed in each direction.

The dot group 20 and the light dispersion dot 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 stamping technique, and the dot group 20 And the light dispersion dots 30 may be formed in any one of polygonal, circular, and oval shapes, but each dot group 20 and the light dispersion dots 30 are not necessarily limited to the above-described techniques and shapes.

A display device including the light guide plate 100 having the above-described features can be manufactured, and specific components of the display device are not limited.

Figure 2 is a diagram schematically showing the principle of light dispersion according to one embodiment.

As shown in FIG. 2, the light dispersion principle according to one embodiment is that 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 any direction. At this time, as the density of the dot pattern 10 increases, the degree of dispersion of the light source 40 increases proportionally, and thus the amount of light emitted from the front portion where the dot group 20 where 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 showing the arrangement of light dispersion dots 30 in the light guide plate 100 in which dot groups 20 are precisely arranged according to an embodiment.

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

As shown in FIG. 3, the light guide plate 100 in which the dot groups 20 are precisely arranged according to one embodiment is provided with the same spacing between the dot groups 20, and the surface on which the light source 40 is incident is As a standard, soil groups provided at equal intervals in each longitudinal direction may be provided in a zigzag form.

At this time, the light dispersion dots 30 may be provided at equal intervals between each dot group 20 provided in the longitudinal direction. The spacing between the light dispersing dots 30 may be changed, and even if provided in a changed manner, the spacing may be equal. In addition, the light guide plate 100 in which the dot groups 20 are precisely arranged according to one embodiment has dot groups 20 provided at equal intervals in each longitudinal direction based on the surface on which the light source 40 is incident. Light dispersion dots 30 are provided, but the present invention is not limited to this, and light dispersion dots 30 may be provided between spaced apart spaces of each dot group 20.

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

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

As shown in FIG. 4, the light guide plate 100 in which the dot groups 20 are precisely arranged according to one embodiment is provided with the same spacing between each dot group 20, and the light dispersion dots 30 are spaced apart from each dot. The groups 20 may be provided at random intervals.

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

As shown in FIG. 5, the light guide plate 100 in which the dot groups 20 are precisely arranged according to one embodiment is provided with the same spacing between each dot group 20, and the light dispersion dots 30 are arranged in the longitudinal direction. Each of the dot groups 20 provided may be provided with the same line calculation, but the spacing may be provided in a random form.

At this time, the random spacing of the light dispersing dots 30 can be adjusted randomly after the preset number of patterns. In addition, the number of light dispersion dots 30 to be provided on the same line in the transverse direction based on the light incident surface and to be provided at random intervals is set to determine the spacing between the light dispersion dots 30 provided in each transverse direction. You can set it.

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

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

As shown in FIG. 6, in the light guide plate 100 in which the dot groups 20 are randomly arranged according to one embodiment, the spacing between each dot group 20 may be provided at random. At this time, 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 are explained based on the light guide plate 100 in which the dot groups 20 in the first cross-sectional view described above in FIG. 6 are randomly arranged.

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

As shown in FIG. 7, in the light guide plate 100 in which the dot groups 20 are randomly arranged according to one embodiment, the spacing between each dot group 20 is provided at random, and between each dot group 20 The spacing between the light dispersing dots 30 may be provided randomly.

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

As shown in FIG. 8, in the light guide plate 100 in which the dot groups 20 are randomly arranged according to one embodiment, the spacing between each dot group 20 may be provided at random. At this time, the light dispersion dots 30 are provided on the same line in the longitudinal direction based on the surface on which the light source 40 is incident, and the spacing between each light dispersion dot 30 may be provided at random.

At this time, the random spacing of the light dispersing dots 30 can be adjusted randomly after the preset number of patterns. In addition, the number of light dispersion dots 30 to be arranged on the same line in the transverse direction based on the light incident surface and to be provided at random intervals is set to determine the spacing between the light dispersion dots 30 provided in each transverse direction. You can set it.

9 to 11 are cross-sectional views showing the 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 embodiment.

Figure 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 embodiment.

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

That is, if the first and second rows of the first row group 51 according to one embodiment are precisely arranged, the third and fourth rows of the second row group 52 may be randomly arranged, and the first row group 51 may be arranged randomly. The precise arrangement of the row and the second row may be at equal intervals, but the arrangement of each row may be in a zigzag form, and the random arrangement of the third and fourth rows may be on the same line for each row or the spacing between the dot groups 20. This can be provided randomly.

At this time, the light dispersion dots 30 may be provided at equal intervals in one direction between each row and each row group 50. Additionally, the light dispersion dots 30 may have a zigzag arrangement of each light dispersion dot 30 provided in one direction.

10 and 11 are explained based on the light guide plate 100 in which the dot groups 20 of the first cross-sectional view described above in FIG. 9 are arranged in precise and random arrangements.

Figure 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 embodiment.

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

Figure 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 embodiment.

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

Figure 12 is a diagram showing the external appearance of a light guide plate to which an arrangement of a dot group and light dispersion dots is applied according to an embodiment.

As shown in FIG. 12, the external state of the light guide plate 100 to which the arrangement of the dot group 20 and the light dispersion dots 30 according to one 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 a hybrid pattern is applied. Here, it can be seen that as the light guide plate 100 to which the hybrid pattern is applied distributes more light sources 40, the defects A1 and scratches A2 disappear.

Although the present invention has been described in detail through representative embodiments above, those skilled in the art will understand that various modifications can be made to the above-described embodiments without departing from the scope of the present invention. will be. Therefore, the scope of rights of the present invention should not be limited to the described embodiments, but should be determined not only by the claims described later, but also by all changes or modified forms derived from the claims and the concept of equivalents.

100: light guide plate 10: dot pattern
20: Dot group 30: Light dispersion dot
40: light source 50: row group
51: 1st row group 52: 2nd row group
A1: Defect A2: Scratch

Claims (10)

A dot pattern that disperses the light source incident from the light incident surface on the side to the front is densely formed in a predetermined number on the surface opposite to the front, and the spacing is the same in the horizontal and vertical directions based on the light incident surface. A plurality of dot groups arranged in either a precise arrangement or a random arrangement with random spacing; and
It includes a plurality of light dispersion dots provided between the space between the dot groups to disperse the light source incident between each dot group in multiple directions,
The plurality of dot groups are,
Forming a first row group arranged in a precise arrangement and a second row group arranged in a random arrangement,
The number of dot groups included in the first row group and the second row group is the same,
The first row group and the second row group are,
arranged to alternate with each other in the transverse direction based on the light incident surface,
The first row group is,
A first row in which dot groups are arranged at equal intervals on the same line in the transverse direction based on the light incident surface; and
Dot groups are arranged at equal intervals on the same line in the transverse direction based on the light incident surface, and a second row is spaced apart from the first row at a predetermined interval in the longitudinal direction based on the light incident surface,
The dot groups of the first row and the second row are arranged in a zigzag shape,
The second row group is,
a third row in which dot groups are arranged at random intervals on the same line in the transverse direction based on the light incident surface; and
Dot groups are arranged at random intervals on the same line in the transverse direction based on the light incident surface, and the third row and a fourth row are spaced at regular intervals in the longitudinal direction based on the light incident surface,
The spacing between the third row and the fourth row is the same as the spacing between the first row and the second row,
The plurality of light dispersion dots are,
A fifth row disposed on the same line in the transverse direction based on the light incident surface between the first and second rows of the first row group,
A sixth row disposed on the same line in the transverse direction with respect to the light incident surface between the third and fourth rows of the second row group,
A seventh row is formed between the first row group and the second row group and is arranged on the same line in the transverse direction with respect to the light incident surface,
The arrangement of the light dispersion dots in the fifth row and the arrangement of the light dispersion dots in the sixth row are the same,
The arrangement of the light dispersion dots in the fifth row and the arrangement of the light dispersion dots in the seventh row are different,
Light guide plate using hybrid pattern.
According to paragraph 1,
The light guide plate using a hybrid pattern, wherein the plurality of light dispersion dots are arranged so that the spacing between the fifth row and the seventh row is the same as the spacing between the seventh row and the sixth row.
delete delete delete According to paragraph 1,
A light guide plate using a hybrid pattern, wherein the light dispersion dots disperse the incident light source at a wider angle than the dot pattern.
According to paragraph 1,
A light guide plate using a hybrid pattern, wherein the dot group and 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 stamping technique.
According to paragraph 1,
A light guide plate using a hybrid pattern, wherein the dot group and light dispersion dots are formed in any one of polygonal, circular, and oval shapes.
delete A display device comprising a light guide plate using the hybrid pattern according to any one of claims 1, 2, and 6 to 8.