CN211043717U - Light guide plate beneficial to section dimming - Google Patents

Abstract

The utility model provides a do benefit to light guide plate that district's section was adjusted luminance for use with formula light source collocation down always, contain the rectangular form slot of a body, the first rectangular form slot of plural number and the rectangular form slot of plural number second. The body is a plate-shaped structure body and is provided with a bottom surface and a light-emitting surface which are oppositely arranged, and the bottom surface corresponds to the direct type light source. The first strip-shaped grooves are arranged on the bottom surface, the second strip-shaped grooves are arranged on the light-emitting surface, the first strip-shaped grooves and the second strip-shaped grooves are vertically staggered in the projection direction, the extension directions of the first strip-shaped grooves and the second strip-shaped grooves are respectively perpendicular to a main light-emitting axis of the direct type light source, and further, the width P1 of the first strip-shaped grooves and the width P2 of the second strip-shaped grooves are respectively 150-300 mu m. Therefore, the regional contrast can be enhanced through the light condensing and light blocking characteristics, so that the regional dimming efficiency in application is improved.

Description

Light guide plate beneficial to section dimming

Technical Field

The utility model relates to a light guide plate field, in particular to do benefit to light guide plate that district section was adjusted luminance.

Background

The backlight module generally comprises various optical components such as a light guide plate, an alignment film, a brightness enhancement film and the like, and utilizes a point light source such as L ED as a main light supply source, so that the light of the point light source can be converted into light in an expected state through the backlight module to form light emission, thereby achieving the effect and the purpose of providing the light to the display panel.

In order to improve the contrast quality of the display, the backlight module still needs to have a function of section Dimming (L ocm), but the lateral point light source is disposed at the side of the light guide plate, so that the problem of uneven brightness is easily caused, which is not beneficial to the section Dimming.

In view of the above, the inventor summarizes the abundant experience in the related industries, conceives and provides a light guide plate beneficial to segment dimming, so as to effectively solve the disadvantages of the direct type backlight module in the area dimming application.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the present invention is to provide a light guide plate with light gathering and light isolating characteristics to enhance the contrast ratio of light emission in the area, thereby improving the performance of light adjustment in the area, and greatly improving the display effect of the display.

The utility model discloses an above-mentioned technical problem is solved through following technical scheme:

a light guide plate for adjusting light in sections, which is used in combination with a direct-type light source, comprises: a body which is a plate-shaped structure body and is provided with a bottom surface and a light-emitting surface, wherein the bottom surface is arranged opposite to the light-emitting surface, and corresponds to the direct type light source to receive light; a plurality of first strip-shaped grooves arranged on the bottom surface; the plurality of second strip-shaped grooves are arranged on the light emergent surface, wherein the first strip-shaped grooves and the second strip-shaped grooves are vertically staggered in the projection direction, and the extension directions of the first strip-shaped grooves and the second strip-shaped grooves are respectively vertical to the main light emergent axis of the direct type light source; wherein the width P1 of the first elongated trenches and the width P2 of the second elongated trenches are between 150 μm and 300 μm, respectively. Therefore, the light guide plate can have the effect of regional light isolation during light emitting through the first and second strip-shaped grooves which are in the size range and are vertically staggered and the structural characteristics that the extending directions of the grooves are mutually perpendicular to the main light emitting axis of the direct type light source respectively, and further the accurate and excellent section dimming effect is achieved when the light guide plate is matched with the direct type light source.

For better light condensing and light isolating performance, preferably, the depth of the first elongated trenches is D1, and conforms to D1: p1 is between 1: 3-2: 3, in the formula (iv).

Preferably, D1: p1 is 1: 2, the light guide plate achieves more accurate dimming effect.

Preferably, the depth of the second elongated trenches is D2, and meets D2: p2 is between 1: 3-2: 3, the light guide plate can have better light condensing and light isolating effects.

In order to further enhance the light-adjusting performance of the light guide plate under the above dimensional relationship, preferably, the ratio of D2: p2 is 1: 2.

preferably, the first strip-shaped grooves and the second strip-shaped grooves are respectively in a V shape, so that the light adjusting effect is better.

Preferably, the thickness of the body is 1.2-2 mm, so as to have the effect of thinning.

Preferably, the first strip-shaped grooves and the second strip-shaped grooves are of a rolled structure, so that the structural accuracy and the product yield are better.

The utility model discloses an actively advance the effect and lie in: the utility model relates to a do benefit to light guide plate that district section was adjusted luminance through laying the rectangular form slot that the relative both sides face of light guide plate is based on specific scale scope, when the straight following formula light source of cooperation uses, regional contrast is reinforceed to the characteristic of usable spotlight, light-proof, reaches the effect that the district section was adjusted luminance effectively, lets the display device of follow-up application can have excellent picture contrast. Furthermore, the structural proportions of the first and second elongated grooves can be respectively limited, so as to improve the dimming performance of the light guide plate in application.

Drawings

Fig. 1 is a perspective view of a light guide plate.

Fig. 2 is a perspective view of a light guide plate and a direct type light source according to a preferred embodiment of the present invention.

Fig. 3 is a schematic view of a partial structure of a light guide plate according to a preferred embodiment of the present invention.

Detailed Description

The present invention will be more clearly and completely described below by way of examples and with reference to the accompanying drawings.

As described above, in order to enhance the application performance of the direct-type backlight module and facilitate the segment dimming control, so that the display device has better image contrast, the present inventors designed various possible optical structures on the light guide plate through continuous conception and experiments, and verified the optical structures to provide products meeting the existing market requirements. Under the application of the direct-type structure, the light guide plate has no requirement of arranging micro mesh points with density change on the lateral light guide plate, so that a blank plate body can be utilized for processing and arranging a required optical structure, and the micro mesh point structure does not need to be arranged on the light guide plate. Accordingly, the present inventors propose to provide a grid structure on the light guide plate, and to improve the light condensing and light blocking effects in each area after the light enters the light guide plate through the grid structure, so that each control area can emit light in a desired light emitting state during the zone dimming. The present inventors have conceived various embodiments and possible solutions, and will first describe an experimental example in which a mesh structure is provided on one surface of a light guide plate.

Fig. 1 is a perspective view of a light guide plate. One of the ways proposed by the present inventors is to form a grid structure on a single surface of a light guide plate. As shown in fig. 1, a grid structure of two types of vertically staggered grooves 91 is disposed on one side surface 90 of the light guide plate 9 to adjust the brightness of light emitted from each area of the light guide plate by the vertically staggered grooves. However, this structure has certain practical disadvantages: firstly, in the process aspect, only two types of grooves are arranged on a single surface, so that the structural integrity is damaged mutually, and the light guiding is influenced; second, since the light guide plate applied to the direct-type structure and having the section dimming function does not need to be provided with the micro dots, when two grooves are disposed on the same surface, the light guide efficiency is reduced due to the waste of the surface area on the other side of the plate and the influence of the micro surface structure of the blank surface.

Fig. 2 is a perspective view of a light guide plate and a direct-type light source of the present embodiment, and fig. 3 is a partial structural view of the light guide plate of the present embodiment, as shown in fig. 2 to 3, the light guide plate 1 facilitating segment dimming according to the present embodiment is used in combination with a direct-type light source 2, and includes a main body 10, a plurality of first strip-shaped grooves 11 and a plurality of second strip-shaped grooves 12, wherein the direct-type light source 2 may include a circuit board 20 and a plurality of L ED light sources 21, the L ED light sources 21 are disposed on the circuit board 20 and may be arranged in a matrix, and the L ED light sources 21 may be sub-millimeter light emitting diodes (Mini L ED), so that a display device to be mounted with a more precise high dynamic range image (HDR) partitioning efficiency.

The main body 10 of the light guide plate 1 is a plate-shaped structure and has a bottom surface 101 and an exit surface 102, the bottom surface 101 and the exit surface 102 are disposed opposite to each other, and the bottom surface 101 corresponds to the direct light source 2 to receive light. Wherein, the body 10 can be a transparent acrylic plate made of PMMA material. The first strip-shaped grooves 11 are disposed on the bottom surface 101, and the second strip-shaped grooves 12 are disposed on the light exit surface 102, wherein the first strip-shaped grooves 11 and the second strip-shaped grooves 12 are vertically disposed in a staggered manner in the projection direction, the extending direction a1 of the first strip-shaped grooves 11 and the extending direction a2 of the second strip-shaped grooves 12 are perpendicular to the main light exit axis B of the direct light source 2, respectively, and the width P1 of the first strip-shaped grooves and the width P2 of the second strip-shaped grooves are respectively 150-300 μm. Through the first strip-shaped grooves 11 and the second strip-shaped grooves 12 which are separately arranged and have vertically staggered projection directions, the light-emitting contrast of each area is enhanced by using the structure of the strip-shaped grooves and the characteristics of light condensation and light isolation, the technological margin can be improved by arranging the strip-shaped grooves on different surfaces, the cost is further saved, the defect that the structures destroy the integrity mutually is eliminated, and the light guide plate 1 can have better light control efficiency when being applied to the section dimming of a direct type light guide plate.

It should be noted that, the utility model discloses a light guide plate 1 is based on the difficult problem that reaches the splendid district's section of a project dimming effect of straight following formula framework and conceives and designs, consequently still must definitely prescribe a limit to the utility model discloses a light guide plate 1 is applied to straight following formula framework in a poor light. Because the light source direction of the light guide plate is closely related to the optical structure design on the light guide plate, different light control effects may be generated when the same optical structure corresponds to different light incident directions, and the current light guide plate development is firstly distinguished by applying the product to a side-entry type backlight framework or a direct type backlight framework, so that the next optical structure design can be continued. Therefore, the application of the lateral light guide plate and the backlight module is not only very different from the present invention in technical essence, but also cannot be replaced with each other. Furthermore, the size order of the first elongated grooves 11 and the second elongated grooves 12 on the novel light guide plate 1 is not a micro dot structure between 5 μm and 100 μm on the conventional lateral light guide plate, but is especially limited to the groove structure with the size of 150 μm to 300 μm, so as to achieve the local dimming performance in the direct-type application. Simultaneously, first long form slot 11 and the long form slot 12 of second also do not have the miniature site of traditional and control the light quantity through density, size, depth change characteristic, in other words, the utility model relates to a first long form slot 11 and the long form slot 12 of second set up the miniature site structure that is used for controlling the light-emitting on the light guide plate with the tradition, except that the size is different completely and can't replace each other, also do not have completely relevantly to the control design of light, should not talk about it with mixing into one.

In addition, in the design, the extending direction of the first elongated groove 11 and the second elongated groove 12 must be parallel to the main light-emitting axis of the side-entering type L ED, and the extending direction of the first elongated groove 11 and the extending direction of the second elongated groove 12 a2 in the three-dimensional space must be perpendicular to the main light-emitting axis B of the light source 2, and the elongated grooves 11, the extending direction of the second elongated groove 12 a1 in the three-dimensional space are perpendicular to the main light-emitting axis B of the light source 2, so that the straight-down type light source x-y in the straight-down type 2-x-y axial direction of the first elongated groove 11 and the straight-down type 3612 in the three-dimensional space are respectively corresponding to the main light-emitting axis B of the light source 2.

Further, the utility model discloses a light guide plate 1 is through the rectangular form slot of first rectangular form slot 11 and the rectangular form slot 12 of second and control the light direction, makes light reflection, polymerization to reach the efficiency of regional light-emitting regulation and control, can let light have even light-emitting effect again simultaneously, with conventional technique the diffuser plate belong to the technical field and the aspect of distinct. Following is directed against the utility model discloses a light guide plate explains with the difference of traditional diffuser plate, in the application of straight following formula framework, sets up the panel on the light source and must possess sufficient heat resistance, otherwise warp because of being heated easily, and then influence light adjustment efficiency, and the diffuser plate is mainly the yellow plate body that PS plastic slab mixed diffusion particle made, compare in the utility model discloses a light guide plate 1 body 10, the diffuser plate has not heat-resistant characteristic, produces the phenomenon of being heated the flexual deformation very easily when consequently using. In addition, as the content recorded in the background art of the present application, the principle of uniformly atomizing light by diffusing particles lies in that light is diffused rather than converged, so that a Halo (Halo) effect is easily caused, and an uneven light emitting state with a Halo is formed, and the light guide plate 1 body 10 of the present invention controls the light direction based on the principle of light guiding and light focusing by using the first long-strip-shaped groove 11 and the second long-strip-shaped groove 12, so as to reflect and aggregate light, and further achieve a better light emitting effect, so as to facilitate zone dimming. On the other hand, as mentioned above, the diffusing particles achieve the purpose of uniformly atomizing light by diffusing light, and thus consume a considerable amount of brightness, resulting in insufficient brightness of the backlight module, and the light guide plate 1 of the present application uniformizes light by reflecting and converging light through the structures of the first elongated grooves 11 and the second elongated grooves 12, so that the light guide plate 1 of the present invention has a better brightness performance in light emission.

In addition, in the present backlight application, it also appears that the film materials with various optical effects, such as alignment film, brightness enhancement film, anti-glare film and even antibacterial film, are disposed in the backlight module after stacking up nearly hundreds of film materials, and these structures are all the film materials (Flim) with very thin thickness, but the utility model discloses a light guide plate 1 does not belong to this kind of optical product, but has the panel structure of a certain board thickness to provide the backlight module structure stiffness who uses, avoid producing fold, warpage phenomenon.

To improve the uniformity of light emission, the depth of the first elongated trenches 11 is D1 in the present embodiment, and is consistent with D1: p1 is between 1: 3-2: 3, in the proportional range, after the light guide plate 1 body 10 receives the light and is adjusted by the first elongated grooves 11 and the second elongated grooves 12, the light output can meet the requirement, so as to facilitate the segment dimming control. Further, in other embodiments, D1: p1 is 1: 2, to present better light adjustment efficiency.

Further, in addition to making the aspect ratio of the first elongated grooves 11 meet the foregoing range, the depth of the second elongated grooves 12 may be made D2, and meet D2: p2 is between 1: 3-2: 3, the light-blocking effect of the body 10 can be effectively improved. In another embodiment, the ratio of D2: p2 is 1: 2, the luminous efficiency can be better.

Furthermore, the first elongated grooves 11 and the second elongated grooves 12 can be respectively V-shaped, so that the light can be effectively adjusted by using the V-shaped structures, thereby achieving excellent light condensing and light isolating effects, and simultaneously, the light can still have sufficient brightness when emitting light.

In addition, for satisfying present market demand, the utility model discloses a body 10 thickness T sets for between 1.2 ~ 2mm to provide comparatively frivolous optical product, whole thickness when effectively reducing follow-up application.

Since the first elongated grooves 11 and the second elongated grooves 12 are respectively disposed on the bottom surface 101 and the light exit surface 102, the first elongated grooves 11 and the second elongated grooves 12 can be formed by roll forming. In actual process, roller jigs may be respectively disposed on the top side and the bottom side of the body 10, that is, at positions corresponding to the light-emitting surface 102 and the bottom surface 101, so that the first strip-shaped grooves 11 and the second strip-shaped grooves 12 may be formed by rolling the light-emitting surface 102 and the bottom surface 101, thereby not only being simpler and more time-saving in process, but also improving the structural accuracy of the first strip-shaped grooves 11 and the second strip-shaped grooves 12.

To sum up, the utility model relates to a do benefit to light guide plate of district section and adjust luminance through laying in the relative both sides face of light guide plate, and has the rectangular form slot of specific size scope, and when the straight following formula light source of cooperation uses, utilizes spotlight, separates the regional contrast of characteristic strengthening of light for the straight following formula backlight module framework that uses can reach the district section effectively and adjust luminance the efficiency, and the display device of follow-up application still and then has excellent picture contrast. Wherein, the utility model discloses a first and the rectangular form slot size of second is different with the site of being applied to the light guide plate of side income formula framework, compares in site structure, and the rectangular form slot of first and second belongs to big order of magnitude structure to ensure to reach required regulation and control to the light, and the site of side income formula light guide plate then need be more and less better, in order to be favorable to laying density adjustment through density, control the light-emitting state, consequently the rectangular form slot of first and second belongs to different technical field with site structure. The structural proportions of the first and second elongated grooves can be further defined to improve the dimming performance of the light guide plate in application. In the process, the first strip-shaped groove and the second strip-shaped groove can be formed by roller coining, so that the production efficiency and the structural accuracy are better, and particularly, the roller coining manufacturing mode has better processing efficiency and yield under the application of large-size light guide. It is therefore an object of the present invention to provide a light guide plate for a direct-lit structure, which is capable of providing a light guide plate with a high light transmission efficiency, and which is capable of providing a light guide plate with a high light transmission efficiency. On the other hand, the utility model discloses still be different with the diffuser plate that conventional use was in straight following formula framework in a poor light, except making because of the principle difference of adjustment light the utility model discloses a light guide plate has better luminance and presents and regional light blocking effect, based on the difference of material essence, the utility model discloses a light guide plate still compares and has better heat-resisting ability in the diffuser plate, effectively prevents that warping phenomenon from taking place.

Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims (8)

1. A light guide plate for adjusting light in sections, which is used in combination with a direct-type light source, comprises:

a body which is a plate-shaped structure body and is provided with a bottom surface and a light-emitting surface, wherein the bottom surface is arranged opposite to the light-emitting surface, and corresponds to the direct type light source to receive light;

a plurality of first strip-shaped grooves arranged on the bottom surface; and

the plurality of second strip-shaped grooves are arranged on the light-emitting surface, wherein the first strip-shaped grooves and the second strip-shaped grooves are vertically staggered in the projection direction, and the extension directions of the first strip-shaped grooves and the second strip-shaped grooves are respectively vertical to the main light-emitting axis of the direct type light source;

wherein the width P1 of the first elongated trenches and the width P2 of the second elongated trenches are between 150 μm and 300 μm, respectively.

2. The light guide plate for facilitating segment dimming according to claim 1,

the depth of the first elongated trenches is D1, and meets D1: p1 is between 1: 3-2: 3, in the formula (iv).

3. The light guide plate for facilitating segment dimming according to claim 2,

d1: p1 is 1: 2.

4. the light guide plate for facilitating segment dimming according to claim 1,

the depth of the second elongated trenches is D2, and meets D2: p2 is between 1: 3-2: 3, in the formula (iv).

5. The light guide plate for facilitating segment dimming according to claim 4,

d2: p2 is 1: 2.

6. the light guide plate for facilitating segment dimming according to claim 1,

the first strip-shaped grooves and the second strip-shaped grooves are V-shaped respectively.

7. The light guide plate for facilitating segment dimming according to claim 1,

the thickness of the body is 1.2-2 mm.

8. The light guide plate for facilitating segment dimming according to claim 1,

the first strip-shaped grooves and the second strip-shaped grooves are of a rolled structure.

Images