TWI522665B - Light guide plate and backlight module - Google Patents

Description

Light guide plate and backlight module

The invention relates to a light guide plate and a backlight module.

FIG. 4 is a schematic view showing the configuration of a dot structure of a conventional light guide plate. As shown in FIG. 4, the dot structure 102 is disposed on the bottom surface 104 of a light guide plate 100. The light incident surface 106 is adjacent to the light source 108. The bottom surface 104 includes a first region P adjacent to the light incident surface 106 of the light guide plate 100 and a distance from the light incident surface. A second region Q of 106, the dot structure 102 may include a first halftone group 102a distributed in the first region P and a second halftone cluster 102b distributed in the second region Q. As shown in the conventional design of FIG. 4, the spacing of two adjacent dots in all regions is generally set to be the same. For example, the dot spacing d1 of any two adjacent dots in the first dot group 102a is the same, and the dot spacing d1 is Equal to the dot spacing d2 of any two adjacent mesh points in the second halftone dot group 102b. However, as the optical path distance increases, the light energy is gradually attenuated, and the optical path is farther away (for example, the second region Q away from the light incident surface 106). The dot distribution density of the second dot group 102b is obviously larger than the dot size of the first dot group 102a, so that the dot of the second dot group 102b is too dense ( The gap between adjacent dots is too small. When printing dots, the dots are easily connected together to cause a paste problem.

Chinese Patent Publication No. CN102323672A discloses a method for optimizing a spot of a light guide plate, which determines the position of each dot according to the size of the light guide plate and the horizontal and vertical spacing of the center of the adjacent dot, and obtains a position according to the positional relationship between the light source and the light guide plate. The first dot density distribution is obtained, and the center coordinates, shape and area of the patch region are obtained to determine the patch region, and the dot density of the patch region is changed according to the patch strength to obtain a second dot density distribution. Taiwan Patent Publication No. TWI247142 discloses a light guide plate structure comprising a light incident surface, a bottom surface, a light exit surface, an end surface and two side surfaces, and the bottom surface is provided There are a plurality of dots, wherein the dots are arranged at a uniform pitch along the Y parallel direction and are arranged at a uniform pitch along the X parallel direction, the dot sizes in the columns are equal, and the radius of the dots in each row varies according to a function according to the number of columns in the row.

The invention provides a light guide plate and a backlight module which can avoid the problem of paste.

An embodiment of the present invention provides a light guide plate including a light incident surface, a bottom surface, and a dot structure. The light incident surface is adapted to be provided with at least one light source, the bottom surface is connected to the light incident surface and is at an angle to the light incident surface, and the bottom surface includes at least a first region adjacent to the light incident surface and a second region away from the light incident surface, and One area does not overlap with the second area. The dot structure is disposed on the bottom surface of the light guide plate and includes a preset dot pattern and a physical dot structure. The physical dot structure includes a first dot group distributed in the first region and a second dot group distributed in the second region, and the preset dot pattern includes a third dot group distributed in the first region and distributed in the second region a fourth network of clusters, and the first network of the first network and the third network of the same network distribution. The second area can be divided into a plurality of unit areas, the area ratio of the total area of the network points of the second network point group in the unit area to the area of the unit area, and the total area of the network points and the area of the unit area of the fourth network point group in the unit area. The area ratio of the second network dot group is larger than the dot size of the first network dot group, and the dot spacing of the second network dot group is larger than the dot spacing of the first network dot group.

In one embodiment, the preset dot pattern is composed of a plurality of circular dots. In a reference direction perpendicular to the light incident surface, the diameter of the circular dot is guided by the light incident surface of the light guide plate relative to the light incident surface. The direction of one surface is increased, and the spacing of the dots of any two adjacent circular dots in the reference direction is the same.

In an embodiment, the dot spacing of the second dot group in the unit area is greater than the dot spacing of the fourth dot group in the unit area, and the dot diameter of the second dot group in the unit area is larger than the fourth dot in the unit area. The dot diameter of the group.

In an embodiment, between two adjacent network points in the second network group The distance is the same, and the spacing of the two adjacent dots in the first network group is the same.

In an embodiment, the gap between every two adjacent dots of the physical dot structure may be greater than 0.1 mm.

In an embodiment, a region in which a gap between each two adjacent mesh points in the preset dot pattern is greater than a predetermined gap belongs to the first region, and a region in which the gap between each two adjacent mesh dots is smaller than the preset gap belongs to the second region.

In an embodiment, the preset gap may be 0.1 mm.

Another embodiment of the present invention provides a backlight module including a light source and a light guide plate. The light guide plate includes a light incident surface, a bottom surface, and a dot structure. The light incident surface is disposed at a position adjacent to the light source, the bottom surface is connected to the light incident surface and is at an angle to the light incident surface, and the bottom surface includes at least a first region adjacent to the light incident surface and a second region away from the light incident surface, and One area does not overlap with the second area. The dot structure is disposed on the bottom surface of the light guide plate and includes a preset dot pattern and a physical dot structure. The physical dot structure includes a first dot group distributed in the first region and a second dot group distributed in the second region, and the preset dot pattern includes a third dot group distributed in the first region and distributed in the second region a fourth network of clusters, and the first network of the first network and the third network of the same network distribution. The second area can be divided into a plurality of unit areas, the area ratio of the total area of the network points of the second network point group in the unit area to the area of the unit area, and the total area of the network points and the area of the unit area of the fourth network point group in the unit area. The area ratio of the second network dot group is larger than the dot size of the first network dot group, and the dot spacing of the second network dot group is larger than the dot spacing of the first network dot group.

According to the design of each of the above embodiments, firstly, by designing a preset dot pattern, different regions of the optical path are generated to generate respective dot distribution density reference values to meet optical design requirements and provide better luminance uniformity, so that when formed In the physical dot structure, the dot density and the dot spacing can be simultaneously increased according to the distribution density of the dot distribution in different regions of the preset dot pattern, while maintaining the same dot density as the preset dot pattern, so that when the dot is printed, Can avoid the connection of the outlets without causing a paste shape.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein. The above and other objects, features, and advantages of the invention will be apparent from

1‧‧‧Backlight module

10‧‧‧Light guide plate

12‧‧‧Into the glossy surface

14‧‧‧ bottom

16‧‧‧Light source

20a‧‧‧First site group

20b‧‧‧Second network group

20c‧‧‧ third network group

20d‧‧‧fourth network group

22‧‧‧ Surface

100‧‧‧Light guide plate

102‧‧‧Network structure

102a‧‧‧First site group

102b‧‧‧Second network group

104‧‧‧ bottom

106‧‧‧Into the glossy surface

108‧‧‧Light source

C, C’‧‧‧ dot gap

D1, d2, d1', d2'‧‧‧ dot spacing

M‧‧‧Unit area

P‧‧‧First Area

Q‧‧‧Second area

S‧‧‧Reference direction

T‧‧‧round outlets

FIG. 1 is a schematic diagram of a backlight module according to an embodiment of the invention.

2A and 2B are schematic diagrams showing the arrangement of a dot structure disposed on the bottom surface of a light guide plate according to an embodiment of the invention.

FIG. 3A shows a dot distribution pattern of a fourth halftone group of a preset halftone dot pattern, and FIG. 3B shows a halftone dot distribution pattern of a second halftone dot group of the physical halftone dot structure.

FIG. 4 is a schematic view showing the configuration of a dot structure of a conventional light guide plate.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the embodiments of the invention. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

FIG. 1 is a schematic diagram of a backlight module according to an embodiment of the invention. As shown in FIG. 1 , the backlight module 1 includes a light guide plate 10 and a light source 16 . The light guide plate 10 has a light incident surface 12 and a bottom surface 14 connected to the light incident surface 12 and at an angle to the light incident surface. The glossy surface 12 is adjacent to a light source 16, such as a light emitting diode light strip. In this embodiment, the bottom surface 14 may include a first region P and a second region Q that do not overlap each other. The first region P may be adjacent to the light incident surface 12 and the second region Q is away from the light incident surface 12, and the dots A structure (not shown) may be disposed in the first region P and the second region Q of the bottom surface 14 of the light guide plate 10.

2A and 2B are diagrams showing a display according to an embodiment of the invention. Schematic diagram of the configuration of the dot structure on the bottom surface of the light panel. In this embodiment, the dot structure includes a preset dot pattern shown in FIG. 2A and a physical dot structure shown in FIG. 2B, and the physical dot structure (FIG. 2B) includes a first dot group distributed in the first region P. 20a and a second halftone dot group 20b distributed in the second region Q, the preset dot pattern (FIG. 2A) includes a third halftone dot group 20c distributed in the first region P and a fourth halftone dot distributed in the second region Q Group 20d. Referring to FIG. 2A, in a preset dot pattern, the spacing of each two adjacent dots (for example, the pitch value d1 of the first region P and the pitch value d2 of the second region Q) are the same, because with the light Increasing the optical energy of the path distance will gradually decay, so the dot size at the position where the optical path is farther away (ie, farther away from the light incident surface 12) can be gradually increased to meet the optical design requirements and provide better luminance uniformity, two adjacent The gap C' of the dot will gradually decrease toward the light entrance surface. Therefore, the first region P and the second region Q of the preset dot pattern can be divided by the size of the gap C′ of each two adjacent dots, when the gap between each two adjacent dots C′ is greater than a preset gap (for example, 0.1) The area of mm) belongs to the first area P, and the area where the gap of each two adjacent dots is smaller than the preset gap (for example, 0.1 mm) belongs to the second area Q. As shown in FIG. 2A, in an embodiment, the third halftone dot group 20c and the fourth halftone dot group 20d of the preset halftone dot pattern may be formed by a plurality of circular mesh dots T, and in a reference direction perpendicular to the light incident surface 12. In S, the diameter of the plurality of circular dots T is increased by the light incident surface 12 of the light guide plate 10 in the direction of the light guide 10 with respect to a surface 22 of the light incident surface 12, and any two adjacent circular dots T in the reference direction S The dot spacing d1', d2' (the linear distance of the two circular dots T center) are the same.

Referring to FIG. 2B again, the physical dot structure of the embodiment of the present invention includes a first halftone dot group 20a distributed in the first region P and a second halftone dot group 20b distributed in the second region Q, and the second halftone dot group 20b. The dot size is larger than the dot size of the first dot group 20a. As shown in FIG. 2B, the first dot group 20a and the second dot group 20b of the physical dot structure may also be composed of a plurality of circular dots T, and a plurality of circular dots T The diameter of the light guide plate 10 is also increased by the light incident surface 12 of the light guide plate 10 relative to a surface 22 of the light incident surface 12, and the dot pitch d2 of the second mesh dot group 20b is greater than the first dot group. The dot spacing of 20a is d1. In this embodiment, the third halftone dot group 20c of the preset halftone dot pattern also located in the first region P has the same dot distribution as the first halftone dot group 20a of the physical dot structure, but is also located in the physical dot structure of the second region Q. The second halftone dot group 20b is different from the dot distribution of the fourth halftone dot group 20d of the preset halftone dot pattern. The different dot distribution patterns of the two second regions Q are described below with reference to FIGS. 3A and 3B. The second area Q of the bottom surface 14 of the light guide plate can be divided into a plurality of unit areas, FIG. 3A shows the distribution pattern of the fourth dot group 20d of the preset dot pattern in the unit area, and FIG. 3B shows the second structure of the physical dot structure. The dot distribution pattern of the dot group 20b under the unit area. 3A and 3B, in the present embodiment, an area ratio of the dot area in the unit area M of the second halftone dot group 20b to the total area of the unit area M and the dot area of the fourth halftone dot group 20d in the unit area M are known. The ratio of one area to the total area of the unit area M is the same, that is, the second halftone group 20b and the fourth halftone group 20d have the same unit area distribution density, but the second dot group 20b has a larger dot spacing d2 in the unit area M than the first The halftone dot group 20d has a dot pitch d2', and the dot size of the second halftone dot group 20b is larger than the halftone dot size of the fourth halftone dot group 20d in the unit region M. According to the design of the embodiment of the present invention, for example, when the mesh group 20b, 20d is composed of circular dots T, the average circular dot diameter (which may be 1.1962 mm) of the second halftone dot group 20b of the physical dot structure is greater than The average circular dot diameter (which may be 1.1857 mm) of the fourth halftone dot group 20d of the preset halftone dot pattern, the dot pitch d2 of the second halftone dot group 20b (which may be 1.3362 mm) is larger than the halftone dot spacing d2' of the fourth halftone dot group 20d ( It can be 1.2557 mm), and the gap C generated by two adjacent dots in the second halftone group 20b is 0.14 mm (>0.1 mm). Therefore, in the present embodiment, although the second halftone dot group 20b distributed in the second region Q has a large size (1.1962 mm>1.1857 mm), the gap can be obtained by increasing the dot pitch d2 (1.3362 mm>1.2557 mm). Since C has an effect of more than 0.1 mm, it is possible to avoid the occurrence of a paste in the second region Q while maintaining the same dot distribution density.

According to the design of each of the above embodiments, first, by designing a preset dot pattern, different regions of the optical path (for example, the first region P and the second region Q) are generated with respective dot distribution density reference values to meet optical design requirements. And provide better brightness uniformity Sex, when the physical dot structure is formed, the dot density and the dot spacing can be simultaneously increased according to the distribution density of the dot distribution in different regions of the preset dot pattern, while maintaining the same dot distribution density as the preset dot pattern. When printing at the dot, it is possible to avoid the dots being connected together without a paste.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention.

20a‧‧‧First site group

20b‧‧‧Second network group

C‧‧‧ dot gap

D1, d2‧‧‧ dot spacing

P‧‧‧First Area

Q‧‧‧Second area

T‧‧‧round outlets

Claims (14)

A light guide plate comprising: a light incident surface adapted to be provided with at least one light source; a bottom surface coupled to the light incident surface and at an angle to the light incident surface, wherein the bottom surface includes at least one adjacent to the light incident surface a region and a second region away from the light incident surface, the first region and the second region do not overlap; and a dot structure disposed on the bottom surface of the light guide plate, the dot structure comprising a predetermined dot pattern and An entity dot structure comprising a first dot group distributed in the first area and a second dot group distributed in the second area, the preset dot pattern comprising a first one distributed in the first area a third network group and a fourth network group distributed in the second area, wherein the first network group and the third network group have the same network distribution, and the second area is divided into a plurality of unit areas, the second The area ratio of the dot area of the dot group in the unit area to the total area of the unit area is the same as the area ratio of the dot area of the fourth network group in the unit area and an area of the total area of the unit area, and the second network point Dot dot size larger than the size of the first group of dots, dot pitch and the dot group is greater than a second pitch of the first dot of the halftone dot groups. The light guide plate of claim 1, wherein the predetermined dot pattern is composed of a plurality of circular dots, and the diameter of the circular dots is determined by a reference direction perpendicular to the light incident surface. The light incident of the light guide plate faces the light guide plate relative to the light incident surface The direction of a surface of the surface is increased, and the spacing of the dots of any two adjacent circular dots in the reference direction is the same. The light guide plate of claim 2, wherein a spacing of the second dot group in the unit area is greater than a dot spacing of the fourth halftone group in the unit area, and the The dot diameter of the two dot group is larger than the dot diameter of the fourth dot group in the unit area. The light guide plate of claim 3, wherein the spacing of the two adjacent dots of the second network of dots is the same, and the spacing of the two adjacent dots of the first network of dots is the same. The light guide plate of claim 1, wherein a gap of each two adjacent dots of the physical dot structure is greater than 0.1 mm. The light guide plate of claim 1, wherein in the preset dot pattern, a region where a gap between each two adjacent dots is greater than a predetermined gap belongs to the first region, and a gap between each two adjacent dots is smaller than the The area of the preset gap belongs to the second area. The light guide plate of claim 6, wherein the preset gap is 0.1 mm. A backlight module includes: a light source; and a light guide plate, including: a light incident surface is disposed adjacent to the light source; a bottom surface is coupled to the light incident surface and is at an angle to the light incident surface, and the bottom surface includes a first region adjacent to the light incident surface and away from the light incident a second area of the surface, the first area does not overlap with the second area; and a dot structure disposed on the bottom surface of the light guide plate, the dot structure comprising a predetermined dot pattern and a physical dot structure, the entity The dot structure includes a first dot group distributed in the first region and a second dot group distributed in the second region, the preset dot pattern comprising a third dot group distributed in the first region and distributed a fourth network group of the second area, wherein the first network group and the third network group have the same network distribution, and the second area is divided into a plurality of unit areas, and the second network group is in the unit area. The ratio of the area of the halftone dot to the area of the total area of the unit area is the same as the area ratio of the halftone dot group in the unit area and the area of the total area of the unit area, and the dot size of the second halftone group is larger than the area Dot size of a dot group, and the dot pitch of the second group of outlets is greater than the dot pitch of the first dot group. The backlight module of claim 8, wherein the predetermined dot pattern is composed of a plurality of circular dots, and the diameter of the circular dots is determined by a reference direction perpendicular to the light incident surface. The light incident of the light guide plate increases in a direction of a surface of the light guide plate relative to the light incident surface, and the dot pitch of any two adjacent circular dots in the reference direction is the same. The backlight module of claim 9, wherein a spacing of the second dot group in the unit area is greater than a spacing of the fourth dot group in the unit area, and the The dot diameter of the second dot group is larger than the dot diameter of the fourth dot group in the unit region. The backlight module of claim 10, wherein the spacing of the two adjacent dots of the second halftone group is the same, and the spacing of the two adjacent ones of the first plurality of dots is the same. The backlight module of claim 8, wherein a gap of each two adjacent dots of the physical dot structure is greater than 0.1 mm. The backlight module of claim 8, wherein in the preset dot pattern, a region in which a gap between each two adjacent dots is greater than a predetermined gap is divided into the first region, and each of the two adjacent dots The area where the gap is smaller than the preset gap is divided into the second area. The backlight module of claim 13, wherein the preset gap is 0.1 mm.