CN105867028B - A kind of backlight module and display device - Google Patents

Abstract

The invention relates to the field of display technology, in particular to a backlight module and a display device. The backlight module includes a base substrate and a surrounding plate arranged on the substrate substrate. The surrounding plate and the substrate substrate form a plurality of grooves, each groove is provided with a light source, and the notch of each groove is provided with a controllable A light-transmitting structure, and a liquid lens is arranged above the controllable light-transmitting structure; the controllable light-transmitting structure includes a light-transmitting area and an adjustable area; In the straight backlight mode, the light-transmitting area transmits light, and the adjustable area does not transmit light; the focus of the liquid lens coincides with the light-transmitting area. The backlight module provided by the present invention is compatible with the common viewing angle mode and the collimated backlight mode, and the collimation degree of the backlight in the collimated backlight mode is high.

Description

A kind of backlight module and display device

technical field

The invention relates to the field of display technology, in particular to a backlight module and a display device.

Background technique

At present, multi-viewpoint 3D display based on collimated backlight and diffractive spectroscopic display are emerging in the industry, and how to provide a backlight with good collimation effect is also one of the problems we are trying to overcome.

At present, the backlight module of liquid crystal display is generally composed of LED, reflector, light guide plate, diffusion film and prism film. After the light emitted from the lower side to the reflector is reflected, it presents divergent light in all directions, and it is impossible to achieve a collimated backlight in which all the light is completely parallel.

Contents of the invention

(1) Technical problems to be solved

The technical problem to be solved by the present invention is how to realize that the backlight module can realize not only the common viewing angle mode but also the collimated backlight mode.

(2) Technical solutions

In order to solve the above technical problems, the present invention provides a backlight module, which includes a base substrate and a surrounding plate arranged on the base substrate, the surrounding plate and the base substrate form a plurality of grooves, Each of the grooves is provided with a light source, and the notch of each groove is provided with a controllable light-transmitting structure, and a liquid lens is also arranged above the controllable light-transmitting structure; the controllable light-transmitting structure includes The light-transmitting area and the adjustable area; in the normal viewing angle mode, both the adjustable area and the light-transmitting area are light-transmitting; in the collimated backlight mode, the light-transmitting area is light-transmitting, and the adjustable area is opaque ; The focal point of the liquid lens coincides with the light-transmitting area.

According to the present invention, the controllable light-transmitting structure includes an upper polarizer, an upper substrate, a liquid crystal layer, a lower substrate, and a lower polarizer arranged in sequence, and a first For the electrode group, the second electrode group is oppositely arranged on the upper substrate and the lower substrate corresponding to the adjustable area.

According to the present invention, by adjusting the voltage of the first electrode group and the second electrode group, the liquid crystal molecules in the corresponding regions are deflected, so that both the light-transmitting region and the adjustable region are light-transmitting in the normal viewing angle mode; in the collimated backlight mode The adjustable area is achieved under opacity.

According to the present invention, the light source is an LED light source.

According to the present invention, the light source includes an LED chip and fluorescent glue, and the fluorescent glue covers the LED chip.

According to the present invention, the LED chip is arranged on the base substrate.

According to the present invention, a buffer layer is arranged between the base substrate and the LED chip.

According to the present invention, the buffer layer is a graphene layer.

According to the present invention, two adjacent grooves share one shroud.

According to the present invention, a high reflective coating is provided on the wall surface of the enclosure.

The present invention also provides a display device, comprising the above-mentioned backlight module.

(3) Beneficial effects

Compared with the prior art, the above-mentioned technical solution of the present invention has the following advantages: the backlight module provided by the embodiment of the present invention can realize two modes of common viewing angle and collimated backlight through the control of the controllable light-transmitting structure and the liquid lens, And when the collimated backlight mode is realized, all the light is emitted from the focal point of the liquid lens through the liquid lens, and all the emitted light is parallel light, which ensures a high degree of collimation of the light.

Description of drawings

FIG. 1 is a schematic structural view of a backlight module in a normal viewing angle mode provided by an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a backlight module in a normal viewing angle mode provided by an embodiment of the present invention;

Fig. 3 is a cross-sectional view of a controllable light-transmitting structure provided by an embodiment of the present invention;

Fig. 4 is a top view of a controllable light-transmitting structure provided by an embodiment of the present invention.

In the figure: 1: substrate substrate; 2: enclosure; 21: high reflective coating; 3: groove; 4: light source; 41: LED chip; 42: fluorescent glue; 43: buffer layer; 5: controllable light transmission Structure; 51: light transmission area; 52: adjustable area; 501: upper polarizer; 502: upper substrate; 503: liquid crystal layer; 504: lower substrate; 505: lower polarizer; 6: liquid lens; 61: spacer thing.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figures 1 and 2, a backlight module provided by an embodiment of the present invention includes a base substrate 1 and a surrounding plate 2 arranged on the base substrate 1, specifically, the base substrate in this embodiment 1 is preferably a glass substrate. The surrounding board 2 and the base substrate 1 form a plurality of grooves 3, each groove 3 is provided with a light source 4, and the notch of each groove 3 is provided with a controllable light-transmitting structure 5, and the controllable light-transmitting structure 5 A liquid lens 6 is also provided above. The controllable light-transmitting structure 5 includes a light-transmitting area 51 and an adjustable area 52; in the normal viewing angle mode, both the adjustable area 52 and the light-transmitting area 51 are light-transmitting; in the collimated backlight mode, the light-transmitting area 51 is light-transmitting, The adjustable area 52 is opaque; the focal point of the liquid lens 6 coincides with the light-transmitting area 51 . Those skilled in the art can choose the type of liquid lens 6 according to needs, and the liquid lens 6 selected in this embodiment is a liquid lens using the principle of electrowetting. When the loading voltage of the liquid lens 6 is zero, the liquid lens 6 is equivalent to a common glass encapsulation layer. At this time, both the adjustable area 52 and the light-transmitting area 51 of the controllable light-transmitting structure 5 are controlled to transmit light, and the light emitted by the light source 4 The light can be emitted directly at a normal viewing angle, and the backlight module is in the normal viewing angle mode. When the loading voltage of the liquid lens 6 is adjusted to a set value (the set value is not zero), the liquid lens 6 acts as a convex lens. At this time, the adjustable area 52 of the controllable light-transmitting structure 5 is controlled to be opaque, and the light source 4. The emitted light only passes through the light-transmitting area 51 and strikes the liquid lens 6. Since the light-transmitting area 51 coincides with the focal point of the liquid lens 6, the light irradiated on the liquid lens 6 is emitted in the form of parallel light. The backlight module In collimated backlight mode. The backlight module provided by the embodiment of the present invention can realize two modes of common viewing angle and collimated backlight through the control of the controllable light-transmitting structure 5 and the liquid lens 6, and when the collimated backlight mode is realized, all the light rays are passed by the liquid lens 6. The focal point is emitted through the liquid lens 6, and all emitted light is parallel light, which ensures high collimation of the light.

Further, the controllable light-transmitting structure 5 in this embodiment includes an upper polarizer 501, an upper substrate 502, a liquid crystal layer 503, a lower substrate 504, and a lower polarizer 505 arranged in sequence, and the upper substrate 502 and A first electrode group is oppositely arranged on the lower substrate 504 , and a second electrode group is oppositely arranged on the upper substrate 502 and the lower substrate 504 corresponding to the adjustable region 52 . By adjusting the voltage of the first electrode group and the second electrode group, the liquid crystal molecules in the corresponding regions are deflected, so that both the light-transmitting region 51 and the adjustable region 52 are transparent in the normal viewing angle mode; the adjustable region 52 is realized in the collimated backlight mode opaque. Specifically, according to the different settings of the liquid crystal molecules, there are two different situations in the control of the first electrode group and the second electrode group: in the first case, the first electrode group in the light-transmitting region 51 keeps the voltage at the set value, Therefore, the liquid crystal molecules in the light-transmitting region 51 are driven to deflect, so that the light-transmitting region 51 can continuously transmit light. When it is zero, the adjustable area 52 is opaque. In the second case, the difference from the first case is that the preset deflection direction of the liquid crystal molecules in the liquid crystal layer is changed so that when the first electrode group of the light-transmitting region 51 maintains a voltage of zero, the light-transmitting region 51 It can transmit light all the time. When the voltage of the second electrode group in the adjustable area 52 is zero, the adjustable area 52 can transmit light. When the voltage of the second electrode group is at a set value, the liquid crystal molecules in the adjustable area 52 will deflect. 52 is opaque. In addition, in the second case, since the light-transmitting region 51 can transmit light without applying a voltage, the setting of the first electrode group in the light-transmitting region 51 can also make the light-transmitting region 51 always transmit light. .

Further, the light source 4 in this embodiment is an LED light source. The luminous efficiency of the LED light source is high. Preferably, the light source 4 in this embodiment includes an LED chip 41 and fluorescent glue 42 , and the fluorescent glue 42 covers the LED chip 41 . Using the LED chip 41 as the light source satisfies the one-to-one correspondence between the light source 4 and the pixel unit, and the light emission is more uniform. The fluorescent glue 42 is mainly a mixture of fluorescent powder and silica gel. The fluorescent glue 42 can be directly dripped onto the LED chip 41 to coat the entire LED chip 41, so as to match the color of the light emitted by the LED chip 41 into a desired color. The fluorescent glue 42 covering the surface of the LED chip 41 can improve the luminous efficiency.

Further, the LED chip 41 in this embodiment is disposed on the base substrate 1 . Specifically, in this embodiment, a buffer layer 43 is disposed between the base substrate 1 and the LED chip 41 . In this embodiment, the buffer layer 43 is preferably a graphene layer. Setting the buffer layer 43 is beneficial to support and fix the LED chip 41 . It should be noted that the buffer layer 43 is not limited to a graphene layer, and may also be formed of sapphire material.

Further, two adjacent grooves 3 in this embodiment share one shroud 2 . Two adjacent grooves 3 sharing one surrounding plate 2 can simplify the structure, reduce the distance between two grooves 3, and make the overall light emission of the backlight module more uniform. Specifically, a spacer 61 is correspondingly provided above each surrounding plate 2 in this embodiment for supporting the liquid lens 6 .

Further, the wall surface of the enclosure 2 in this embodiment is provided with a high reflective coating 21 . Setting the high reflective coating 21 can improve the utilization rate of the light emitted by the light source 4 .

An embodiment of the present invention also provides a display device, including the above-mentioned backlight module. The projection of the surrounding board 2 of the backlight module on the display panel of the display device is located within the projection of the black matrix on the display panel. The backlight module is compatible with the common viewing angle mode and the collimated backlight mode, and the collimation of the backlight in the collimated backlight mode is high, which can improve the performance of the display device.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (11)

1. a kind of backlight module, the coaming plate including underlay substrate and on the underlay substrate, the coaming plate and the lining Substrate, which encloses, to be set to form multiple slots, is equipped with light source in each slot, it is characterised in that：The notch of each slot is equipped with can Translucent construction is controlled, is additionally provided with liquid lens above the controllable translucent construction；

The controllable translucent construction includes transmission region and adjustable area；

Under common view angle mode, the adjustable area and the equal light transmission of transmission region；

Under collimated back mode, the transmission region light transmission, the adjustable area is opaque；The focus of the liquid lens with The transmission region coincides.

2. backlight module according to claim 1, it is characterised in that：The controllable translucent construction include set gradually it is upper Polaroid, upper substrate, liquid crystal layer, lower substrate and down polaroid, phase on the corresponding upper substrate of the transmission region and lower substrate To being provided with first electrode group, second electrode group is relatively set on the corresponding upper substrate of the adjustable area and lower substrate.

3. backlight module according to claim 2, it is characterised in that：By adjusting the first electrode group and second electrode The voltage of group deflects corresponding region liquid crystal molecule, realizes that the transmission region and adjustable area are equal under common view angle mode Light transmission；Realize that the adjustable area is opaque under collimated back mode.

4. backlight module according to claim 1, it is characterised in that：The light source is LED light source.

5. backlight module according to claim 4, it is characterised in that：The light source includes LED chip and fluorescent glue, described Fluorescent glue is covered on the LED chip.

6. backlight module according to claim 5, it is characterised in that：The LED chip is arranged on underlay substrate.

7. backlight module according to claim 6, it is characterised in that：It is set between the underlay substrate and the LED chip It is equipped with buffer layer.

8. backlight module according to claim 7, it is characterised in that：The buffer layer is graphene layer.

9. backlight module according to claim 1, it is characterised in that：Two adjacent slots share a coaming plate.

10. backlight module according to claim 9, it is characterised in that：The wall surface of the coaming plate is equipped with high reflecting coating.

11. a kind of display device, it is characterised in that：Including such as described in any item backlight modules of claim 1-10.