WO2019085629A1

WO2019085629A1 - Liquid crystal display device and backlight module thereof

Info

Publication number: WO2019085629A1
Application number: PCT/CN2018/103542
Authority: WO
Inventors: 李�浩; 李富琳; 宋志成
Original assignee: 青岛海信电器股份有限公司
Priority date: 2017-10-30
Filing date: 2018-08-31
Publication date: 2019-05-09
Also published as: CN107643632A

Abstract

A liquid crystal display device (200) and a backlight module thereof. The liquid crystal display device (200) comprises: a quantum dot liquid crystal panel (250); and a backlight module, stacked on the quantum dot liquid crystal panel (250). The backlight module comprises: a backlight source (210), emitting light to illuminate the quantum dot liquid crystal panel (250); and a light collimating film (240), disposed on a light incident side of the quantum dot liquid crystal panel (250). Light from the backlight source (210) passes through the light collimating film (240) so as to be directed to the quantum dot liquid crystal panel (250). A substrate of the light collimating film (240) is made from a light-transmissive material. Multiple non-light-transmissive opaque portions (241) are spaced apart from each other on the side of the light collimating film (240) close to the backlight source (210). The multiple opaque portions (241) are configured such that an exit angle of light exiting from an exit surface of the light collimating film (240) is less than a preset angle.

Description

Liquid crystal display device and backlight module thereof

The present application claims priority to and the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of .

Technical field

The present disclosure relates to the field of display technologies, and in particular, to a liquid crystal display device and a backlight module thereof.

Background technique

The liquid crystal display usually includes a backlight module and a liquid crystal panel which are sequentially disposed. The liquid crystal panel is a passive light-emitting component, which does not emit light by itself, and requires a backlight module to provide a backlight with sufficient brightness to realize the display function of the liquid crystal display device.

Public content

In one aspect, a liquid crystal display device is provided. The liquid crystal display device includes a quantum dot liquid crystal panel, a backlight module, and the backlight module is stacked on the quantum dot liquid crystal panel, and includes: a backlight, the backlight emits light to illuminate the quantum a liquid crystal panel; a light collimating film disposed on a light incident side of the quantum dot liquid crystal panel, wherein the light of the backlight passes through the light collimating film and is directed to the quantum a liquid crystal panel; and a substrate of the light collimating film is a light transmissive material, and a plurality of light rays that are not transparent to the backlight are disposed on a side of the light collimating film near the backlight In the opaque portion, the plurality of opaque portions are disposed such that an exit angle of light emitted from a light exit surface of the light collimating diaphragm is smaller than a predetermined angle.

In another aspect, a backlight module is provided. The backlight module includes: a backlight configured to emit light; a light collimating diaphragm configured to receive light emitted by the backlight, the light collimating diaphragm The substrate is a light transmissive material, and a plurality of opaque portions that are not transparent to the light of the backlight are disposed on a side of the light collimating film near the backlight, and the plurality of opaque portions are opaque. The portion is configured to cause an exit angle of the light emitted from the light exit surface of the light collimating diaphragm to be smaller than a preset angle.

DRAWINGS

In order to more clearly illustrate the aspects of the embodiments of the present disclosure, a brief description of the drawings to be used in the description of the embodiments will be briefly described. It is obvious that the drawings in the following description are some embodiments of the present disclosure, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative labor.

1 is a schematic structural view of a liquid crystal display device provided in the related art;

2A is a schematic structural diagram of a liquid crystal display device according to some embodiments of the present disclosure;

2B is a partial detail view of the liquid crystal display device shown in FIG. 2A;

2C is a perspective view of a light collimating film in the liquid crystal display device shown in FIG. 2A;

2D is a schematic structural view of a quantum dot liquid crystal panel in the liquid crystal display device shown in FIG. 2A;

3 is another schematic structural diagram of a liquid crystal display device according to some embodiments of the present disclosure;

4 is another schematic structural diagram of a liquid crystal display device according to some embodiments of the present disclosure;

FIG. 5 is still another schematic structural diagram of a liquid crystal display device according to some embodiments of the present disclosure;

FIG. 6 is a schematic structural diagram of a backlight module according to some embodiments of the present disclosure.

Detailed ways

The technical solutions in the embodiments of the present disclosure are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present disclosure. It is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without departing from the inventive scope are the scope of the disclosure. It is to be noted that the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals indicate the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are intended to be illustrative, and are not to be construed as limiting. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in some embodiments.

The terms "first", "second" and similar terms used in the specification and claims of the present disclosure do not denote any order, quantity or importance, and are merely used to distinguish different components. The word "comprising" or "comprises" or the like means that the element or item preceding the word is intended to be in the The terms "upper/upper", "lower/lower", "one side", and "other side" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, for convenience of explanation of the present disclosure. The simplification of the description of the present invention is not intended to limit or imply that the device or component referred to has a particular orientation, and is constructed and operated in a particular orientation.

The current liquid crystal display device employs a quantum dot liquid crystal panel including a liquid crystal layer and a quantum dot layer disposed above the liquid crystal layer. The liquid crystal layer includes a plurality of liquid crystal cells arranged in order, and the liquid crystal cells are separated by a black matrix. The quantum dot layer includes a plurality of quantum dot pixel unit groups arranged in sequence, and the quantum dot pixel unit group includes quantum dot pixel units sequentially arranged to convert the backlight correspondingly into three primary colors, wherein the quantum dots in the display region of the quantum dot liquid crystal panel The pixel unit is disposed in one-to-one correspondence with the liquid crystal unit. The quantum dot pixel unit group mainly includes a red quantum dot pixel unit, a green quantum dot pixel unit, and a blue quantum dot pixel unit. A red quantum dot material is disposed in the red quantum dot pixel unit; a green quantum dot material is disposed in the green quantum dot pixel unit; a quantum dot material is not disposed in the blue quantum dot pixel unit or a blue quantum dot material is disposed. In some implementations, when the blue backlight is illuminated on the red, green, and blue quantum dot pixel units, the blue backlight in the blue quantum dot pixel unit directly transmits and emits blue light, and the green quantum dot pixel unit The quantum dot material converts the blue backlight into green light and emits green light, and the quantum dot material in the red quantum dot pixel unit converts the blue backlight into red light and emits red light.

FIG. 1 is a schematic structural diagram of a liquid crystal display device 100 provided in the related art. In FIG. 1, the quantum dot liquid crystal panel 120 is disposed above the backlight 110. For example, when the green color is displayed, the liquid crystal cell 121 corresponding to the green quantum dot pixel unit 1222 is in an open state, the red quantum dot pixel unit 1221 and the blue quantum dot. The liquid crystal cell 121 corresponding to the pixel unit 1223 is in a closed state. Although a black matrix exists between the respective liquid crystal cells 121, since the light source angle of the backlight 110 is large and a certain gap exists between the quantum dot layer and the liquid crystal layer, the green color is obtained. The blue light emitted by the liquid crystal cell 121 corresponding to the quantum dot pixel unit 1222 at a large angle continues to diverge after being emitted from the liquid crystal cell 121, and can still be irradiated to the red quantum dot pixel unit 1221 and the blue quantum dot pixel unit 1223 to excite red light and transparent. When it is blue, red and blue light are generated when green is displayed. When the same color is displayed in red or blue, there are cases where light of other colors is generated.

Some embodiments of the present disclosure provide a liquid crystal display device 200 having a structure as shown in FIG. 2A, including a quantum dot liquid crystal panel 250, a light collimating film 240, a backlight 210, a light collimating film 240, and a backlight 210. The backlight module 260 is formed. The backlight module 260 and the quantum dot liquid crystal panel 250 are stacked on each other. In some embodiments, a diffusion sheet 270 is also disposed between the light collimating film 240 and the backlight 210.

The backlight 210 emits light to illuminate the quantum dot liquid crystal panel 250. The light collimating film 240 is disposed on the light incident side of the quantum dot liquid crystal panel 250. The substrate 242 of the light collimating film 240 is a light transmissive material. A plurality of opaque portions 241 of the backlight 210 are disposed at a side of the straight film 240 adjacent to the backlight 210. The light of the backlight 210 enters the light collimating film 240 from the light incident surface 243, and passes through the base. The material 242 is emitted to the quantum dot liquid crystal panel 250, and the plurality of opaque portions 241 are disposed such that the angle of the light emitted from the light exit surface of the light collimating film 240 is smaller than a predetermined angle. The light-emitting surface of the light-collimating film 240 is a surface opposite to the light-incident surface 243, that is, the upper surface of the light-collimating film 240 in the state shown in Fig. 2A. In some embodiments of the present disclosure, the predetermined angle is about 30°.

In some embodiments, the cross section of the opaque portion 241 in the direction of the light collimating film 240 toward the quantum dot liquid crystal panel is 锲-shaped, inverted triangle, semi-circular, trapezoidal, rectangular or other opaque portion. A shape of a certain depth is exhibited on the light collimating film 240. In some embodiments, the minimum distance between the adjacent two opaque portions 241 on the light incident surface 243 is D1, and the depth of the single opaque portion 241 relative to the light incident surface 243 is D2, wherein the depth is impervious. The distance of the light portion from the side of the light-emitting surface of the optical alignment film 240 to the light-incident surface of the light-collimating film 240. As shown in FIG. 2B, the above-described minimum separation distance D1 and depth D2 satisfy the formula: 0.1 ≤ D1/D2 ≤ 0.5.

In some embodiments, the ratio of the minimum separation distance D1 between the adjacent two opaque portions 241 on the light incident surface 243 and the depth D2 of the opaque portion 241 with respect to the light incident surface 243 is such that The angle of incidence of the light from the light exit surface of the light collimating diaphragm 240 is between ±30°. That is, the exit angle at which the light is emitted from the light exit surface of the light collimating diaphragm 240 satisfies the preset angle.

At this time, since the range of the ratio between the minimum separation distance D1 of the adjacent two opaque portions 241 on the light incident surface 243 and the depth D2 of the opaque portion 241 with respect to the light incident surface 243 is defined, The divergence angle of the light emitted by the backlight 210 after passing through the light collimating film 240 is converged with respect to the light incident on the light incident surface 243 of the light collimating film 240. Thus, it is possible to make the exit angle of the light transmitted from the substrate 242 (i.e., the angle between the outgoing light and the imaginary line perpendicular to the light incident surface 243 of the light collimating film 240) to a predetermined angle, which is larger than this The angled light does not exit the light collimating diaphragm 240. When the selected minimum separation distance D1 and depth D2 satisfy the above formula, the structure of the light collimating diaphragm 240 is also determined.

Referring to FIG. 2D, the quantum dot liquid crystal panel 250 includes a liquid crystal layer 251 and a quantum dot layer 252; the liquid crystal layer 251 includes a plurality of liquid crystal cells 2511 arranged in sequence; and the quantum dot layer 252 is disposed on a side of the liquid crystal layer 251 remote from the backlight 210. The quantum dot layer 252 includes a plurality of quantum dot pixel unit groups 252' arranged in sequence, each quantum dot pixel unit group 252' including three quantum dot pixel units capable of correspondingly converting light from the backlight 210 into three primary colors ( A red pixel unit 2521, a green pixel unit 2522, and a blue pixel unit 2523) are provided in a one-to-one correspondence with each liquid crystal cell. The preset angle refers to a ray of light transmitted from the light collimating film 240 and perpendicular to the light emitting surface 243 of the light collimating film 240 when no color is generated when displaying one of the three primary colors. The maximum angle between the lines, as shown by the angle α in Figure 2D.

In some embodiments of the present disclosure, the overall thickness of the light-collimating film 240 is not more than 500 μm. If the thickness of the light-collimating film is too large, the overall size of the liquid crystal display device 200 is affected, which is disadvantageous for the thinning of the liquid crystal display device 200. In addition, the opaque portion 241 should have a certain depth D2 to ensure that light larger than the predetermined angle cannot be emitted from the substrate 242, and the depth D2 of the opaque portion 241 with respect to the light incident surface 243 should be less than 300 μm.

Given the following exemplary dimensions, it should be noted that the following dimensions are merely examples and are not intended to limit the specific dimensions selected for the embodiments of the present disclosure. The minimum distance D1 of the adjacent two opaque portions 241 on the light incident surface 243 is selected to be D1=60 μm, and the depth of the opaque portion 241 with respect to the light incident surface 243 is D2=200 μm, and D1/D2=0.3. The above formula is satisfied. At this time, the maximum light exit angle from the light collimating film 240 to the liquid crystal panel 250 is smaller than the predetermined angle.

In some embodiments of the present disclosure, a minimum separation distance D1=50 μm between the adjacent two opaque portions 241 on the light incident surface 243 and a depth of the opaque portion 241 relative to the light incident surface 243 may also be selected. D2=250 μm, at this time, D1/D2=0.2, which satisfies the above formula. At this time, the maximum light exit angle emitted from the light collimating film 240 to the liquid crystal panel 250 is smaller than the predetermined angle.

In some embodiments of the present disclosure, a minimum separation distance D1=60 μm between the adjacent opaque portions 241 on the light incident surface 243 and a depth D2 of the opaque portion 241 with respect to the light incident surface 243 may also be selected. 150 μm, where D1/D2=0.4, satisfies the above formula. At this time, the maximum light exit angle from the light collimating film 240 to the liquid crystal panel 250 is also smaller than the predetermined angle.

In some embodiments of the present disclosure, as shown in FIG. 2C (FIG. 2C is a schematic view of a perspective view of the light collimating film 240), each of the opaque portions 241 is in the form of a sinker, and the sinker is formed by light. The light incident surface 243 of the collimating film 240 is recessed toward the inside of the light collimating film 240. And as shown in FIG. 2C, each of the opaque portions 241 extends from one side of the light collimating film 240 to the other opposite side such that each of the opaque portions 241 is on the quantum dot liquid crystal panel 250. The projection is located between the adjacent two columns of quantum dot pixel units displaying the three primary colors in the quantum dot liquid crystal panel 250, that is, the light transmitting portion between the adjacent two opaque portions 241 is located at a position on the quantum dot panel 250. A column of pixels corresponds; for example, in some embodiments, the projection of an opaque portion 241 on the quantum dot liquid crystal panel 250 is located in the first column of quantum dot pixel cells and the second column of quantum dot pixels in the quantum dot liquid crystal panel 250. The projection of the other column of opaque portions 241 adjacent to the cells on the quantum dot liquid crystal panel 250 is located between the second column of quantum dot pixel cells and the third column of quantum dot pixel cells in the quantum dot liquid crystal panel 250. That is, the light transmitting portion between the two opaque portions corresponds to the second column of quantum dot pixel units.

In some embodiments of the present disclosure, the sinking groove of the opaque portion 241 is filled with the light absorbing material 2411 and the light reflecting material 2412, wherein the light absorbing material 2411 is located in a sinking groove on a side of the quantum dot liquid crystal panel 250. The reflective material 2412 is located on a side of the light absorbing material 2411 away from the quantum dot liquid crystal panel 250. In the state shown in FIG. 2A, the light reflecting material 2412 is disposed below the light absorbing material 2411. Light from the backlight 210 that is directed toward the light absorbing material 2411 is absorbed, and light that is directed toward the light reflecting material 2412 is reflected. At this time, the depth D2 of the opaque portion 241 with respect to the light incident surface 243 is equal to the overall thickness of the light absorbing material 2411 and the light reflecting material 2412 in the direction perpendicular to the light incident surface 243.

In some embodiments of the present disclosure, the opaque portion 241 may reflect light rays impinging thereon.

In some embodiments of the present disclosure, the cross-sectional area of the sinking groove parallel to the light incident surface 243 of the light collimating film 240 is reduced in a direction along the light collimating film 240 directed to the quantum dot liquid crystal panel 250. Small or constant, in other words, the cross-sectional area of the light-incident surface of the light-absorbing material 2411 parallel to the light-collimating diaphragm is reduced or remains constant. If the area of the cross section of the light absorbing material 2411 is reduced, the longitudinal section of the light absorbing material 2411 perpendicular to the light incident surface 243 of the light collimating film 240 may be trapezoidal, curved, etc.; if the cross section of the light absorbing material 2411 is maintained The longitudinal section of the light absorbing material 2411 perpendicular to the light incident surface 243 of the light collimating film 240 is rectangular.

In some embodiments of the present disclosure, as shown in FIG. 2A, the longitudinal section of the light absorbing material 2411 is an isosceles trapezoid. In the direction in which the light collimating film 240 is directed to the quantum dot liquid crystal panel 250, the length of the upper isosceles trapezoid formed by the longitudinal section of the light absorbing material 2411 is shorter than the length of the lower base, and the entire opaque portion 241 is The processing is easier to shape than the rectangular shape.

In some embodiments of the present disclosure, the area of the cross-section of the reflective material 2412 decreases in the direction along which the light collimating film 240 is directed toward the quantum dot liquid crystal panel 250. The area of the contact surface of the light-reflecting material 2412 and the light-absorbing material 2411 is equal. At this time, the side surface and the bottom surface of the light-reflecting material 2412 are both reflective surfaces, and the light is reflected on the reflective material 2412.

In some embodiments of the present disclosure, as shown in FIG. 2A, the longitudinal section of the reflective material 2412 is an isosceles trapezoid. The length of the upper base of the isosceles trapezoid formed by the longitudinal section of the light-reflecting material 2412 is shorter than the length of the lower base in the direction in which the light-collimating film 240 is directed toward the quantum dot liquid crystal panel 250.

In some embodiments of the present disclosure, the thickness of the reflective material 2412 is not less than 50 μm. If the thickness of the reflective material 2412 is too low, the reflective effect of the reflective material 2412 on the light is reduced, and the incident light is not incident on the reflective material 2412. The effect of light reflection.

In addition to the quantum dot liquid crystal panel 250 and the backlight module 260 described above, the liquid crystal display device 200 further includes other optical components such as a reflective sheet, a polarizing plate, and the like. In some embodiments of the present disclosure, the other optical components include a reflective sheet 220, and the light reflected by the bottom surface of the reflective material 2412 is reflected by the reflective sheet 220 to re-enter the light collimating film 240 and re-aligned. .

In some embodiments of the present disclosure, the liquid crystal display device is a direct type display device, and the direct type display device further includes a groove type back plate disposed on a side of the reflection sheet 220 away from the light collimation film 240 (not shown). Show). The reflection sheet 220 is of a groove type, and the groove bottom of the groove type reflection sheet 220 is provided with a through hole through which the backlight 210 passes, and the backlight 210 is disposed through the through hole.

In some embodiments of the present disclosure, the light absorbing material 2411 has an absorbance greater than 0.8 and the reflective material 2412 has a light reflectance greater than 0.8.

The light emitted by the backlight 210 is incident on the light collimating film 240, and a part of the light is directly incident on the light absorbing material 2411. Since the light absorbing material 2411 is made of a material having an absorption ratio greater than 0.8, the portion of the light is in the substrate 242 and the opaque portion. After being refracted on the critical surface of 241, it cannot be emitted from the light absorbing material 2411, but re-enters the light absorbing material 2411, and the light incident on the light absorbing material 2411 is directly absorbed; a part of the light is directly emitted from the substrate 242 of the light collimating film 240. On the quantum dot liquid crystal panel 250, that is, the light emitted from the light exit surface of the light collimating film 240 and having an exit angle satisfying the predetermined angle is refracted and totally reflected on the critical surface of the substrate 242 and the opaque portion 241. The rear vector sub-dot liquid crystal panel 250 exits; and a portion of the light is incident on the reflective material 2412 disposed under the light absorbing material 2411. The light is reflected by the reflective material 2412 onto the reflective sheet 220 disposed around the backlight 210, and is reflected. At least one reflection of the sheet 220, the portion of the light is again incident on the light collimating film 240, re-aligned until finally absorbed by the light absorbing material 2411, Alternatively, the light-transmitting material substrate 242 is emitted to the liquid crystal panel 250 or is reflected by the light-reflecting material 2412, and the above process is repeated again. In this way, the light utilization efficiency can be improved and a good light collimation effect can be ensured.

Advantageous technical effects of the technical solutions proposed by some embodiments of the present disclosure include:

A liquid crystal display device provided by some embodiments of the present disclosure includes a quantum dot liquid crystal panel and a backlight module stacked on each other, the backlight module including a backlight, and light collimation disposed on the light incident side of the quantum dot liquid crystal panel a substrate; the substrate of the light-collimating film is a light-transmitting material, and the light-collimating film is spaced apart from a side of the backlight, and a plurality of opaque portions are disposed at intervals The plurality of opaque portions are configured to solve the problem of color crosstalk between two quantum dot pixels on the quantum dot liquid crystal panel by causing an exit angle of the light transmitted by the light collimating film to satisfy the predetermined angle. The preset angle refers to a light transmitted from the light collimating film and an imaginary line perpendicular to the light collimating film when no color is generated when displaying one of the three primary colors. The maximum angle between them. The sinker of the opaque portion is filled with a light absorbing material and a light reflecting material, and light that is incident on the light absorbing material is absorbed, and light that is incident on the light reflecting material is reflected to a reflective sheet around the backlight, and passes through the reflective sheet. At least one reflection, the light re-enters the light collimating diaphragm, improving the utilization of the backlight.

Some embodiments of the present disclosure provide another structure of a liquid crystal display device. As shown in FIG. 3, the liquid crystal display device 300 includes a quantum dot liquid crystal panel 350, a light collimating film 340, a backlight 310, a light collimating film 340, and a backlight 310 to form a backlight module 360. The backlight module 360 and the quantum dot liquid crystal panel 350 are stacked on each other. The liquid crystal display device shown in FIG. 3 is a side-lit display device, and further includes a light guide plate 330 disposed on a side of the light collimating film 340 away from the quantum dot liquid crystal panel 350, and the backlight 310 is disposed on the light guide plate. On the light incident side of 330, a non-light-emitting side of the light guide plate 330 is provided with a reflection sheet 320. The light emitted by the backlight 310 enters the light guide plate 330. The dots in the light guide plate 330 destroy the total reflection of the light, and then the light is emitted from the light guide plate 330 into the light collimation film 340, and then passes through the light collimating film 340 and the setting. The synergistic effect of the reflection sheet 320 on the non-light-emitting side of the light guide plate 330 is the same as that of the liquid crystal display device shown in Figs. 2A to 2D.

Some embodiments of the present disclosure provide still another structure of a liquid crystal display device. As shown in FIG. 4, the liquid crystal display device 400 includes a quantum dot liquid crystal panel 450, a light collimating film 440, a backlight 410, a light collimating film 440, and a backlight 410 to form a backlight module 460. The backlight module 460 and the quantum dot liquid crystal panel 450 are stacked on each other. A plurality of opaque portions 441 that are non-transmissive to the light of the backlight 410 are disposed on a side of the light-collimating film 440 adjacent to the backlight 410. In each of the opaque portions 441, the longitudinal cross-section of the light-absorbing material 4411 is rectangular. The longitudinal section of the reflective material 4412 is an isosceles trapezoid. A portion of the light emitted by the backlight 410 is incident on the light absorbing material 4411 and is directly absorbed; a portion of the light is directly emitted from the substrate 442 of the light collimating film 440 onto the quantum dot liquid crystal panel 450; a portion of the light is incident on the side of the reflective material 4412. And reflected by the side surface of the reflective material 4412, thereby exiting from the substrate 442 of the light collimating film 420; a portion of the light is incident on the bottom surface of the reflective material 4412, and is reflected back to the reflective sheet 420 by the bottom surface of the reflective material 4412, passing through the reflective sheet 420. At least one reflection, re-enter the light collimating diaphragm 440 and re-align. The rest of the structure and function of the liquid crystal display device 400 are the same as those of the liquid crystal display device shown in FIGS. 2A-2D, and the beneficial technical effects are also the same, and will not be described herein.

Some embodiments of the present disclosure provide still another structure of a liquid crystal display device. As shown in FIG. 5, the liquid crystal display device 500 includes a quantum dot liquid crystal panel 550, a light collimating film 540, a backlight 510, a light collimating film 540, and a backlight 510 to form a backlight module 560. The backlight module 560 and the quantum dot liquid crystal panel 550 are stacked on each other. The liquid crystal display device shown in FIG. 5 is a side-lit display device, and further includes a light guide plate 530 disposed on a side of the light collimating film 540 away from the quantum dot liquid crystal panel 550, and the backlight 510 is disposed on the light guide plate. On the light incident side of 530, a non-light-emitting side of the light guide plate 530 is provided with a reflection sheet 520. The light emitted from the backlight 510 enters the light guide plate 530. The dot in the light guide plate 530 destroys the total reflection of the light, and then the light exits the light guide plate 530 and enters the light collimation film 540. The light collimating film 540 and FIG. 4 The structure and function of the light collimating film 440 are the same; the remaining structure and function of the liquid crystal display device 500 are the same as those of the liquid crystal display device 400 of FIG. 4, and the beneficial technical effects are also the same, and will not be described herein. .

Some embodiments of the present disclosure also provide a backlight module. As shown in FIG. 6 , the backlight module 660 includes a backlight 610 configured to emit light, and a light collimating film 640 configured to receive light emitted by the backlight 610 . The substrate 642 of the light collimating film 640 is a light transmissive material, and a plurality of opaque portions 641 that are not transparent to the light of the backlight 610 are disposed on a side of the light collimating film 640 adjacent to the backlight 610. The plurality of opaque portions 641 are disposed such that an exit angle of the light emitted from the light exit surface of the light collimating film 640 is smaller than a predetermined angle. In some embodiments, the predetermined angle is 30°. In some embodiments, the backlight module further includes a diffusion sheet 670.

Referring to FIG. 2B, the minimum distance between two adjacent opaque portions 641 on the light incident surface 643 of the light collimating film 640 is D1, and the single opaque portion 641 is opposite to the light collimating film 641. The depth of the light incident surface 643 is D2, and satisfies the formula: 0.1 ≤ D1/D2 ≤ 0.5.

Each of the opaque portions 641 has a shape of a groove which is formed by recessing the light incident surface 643 of the light collimating film 640 toward the inside of the light collimating film 640.

The sinking groove of the opaque portion 641 is filled with a light absorbing material 6411 and a light reflecting material 6412. The light absorbing material 6411 is located on a side of the sinking groove away from the light incident surface 643 of the light collimating film 640, and the light reflecting material 6412 is located at the light absorbing material 6411 near the light ray. The alignment diaphragm 640 enters one side of the light surface 643.

The sinking groove is parallel to the direction in which the light incident surface 643 of the light collimating film 640 is directed to the light emitting surface (the light emitting surface is the surface opposite to the light incident surface 643, that is, the upper surface in the state shown in FIG. 6). The cross section of the light incident surface 643 of the light collimating diaphragm 640 remains unchanged or reduced. For example, in the direction of the light-emitting surface 643 along the light-incident surface 640 of the light-collimating film 640, the area of the cross-section of the light-absorbing material 6411 is reduced or remains constant, and the area of the cross-section of the light-reflecting material 6412 is reduced.

The backlight module 660 may further include a groove type reflection sheet 620. When the backlight module 660 is a direct type backlight module, the backlight source 610 is disposed at the groove bottom of the groove type reflection sheet 620.

Other components of the liquid crystal display device of the art are well known to those skilled in the art, and reference may be made to the prior art in the art, and will not be described in detail herein.

The above and other specific embodiments of the present disclosure are intended to be illustrative of the embodiments of the present invention. Any modifications, equivalent substitutions, improvements, etc. within the spirit and scope of the present disclosure are intended to be included within the scope of the present disclosure.

Claims

A liquid crystal display device comprising:

Quantum dot liquid crystal panel;

a backlight module, the backlight module is disposed on the quantum dot liquid crystal panel, and includes:

a backlight, the backlight emits light to illuminate the quantum dot liquid crystal panel;

a light collimating film, the light collimating film is disposed on a light incident side of the quantum dot liquid crystal panel, and the light of the backlight passes through the light collimating film and is directed to the quantum dot liquid crystal panel; as well as

The substrate of the light collimating film is a light transmissive material, and a plurality of opaque portions that are not transparent to the light of the backlight are disposed on a side of the light collimating film near the backlight. The plurality of opaque portions are configured such that an exit angle of the light emitted from the light exit surface of the light collimating diaphragm is less than a predetermined angle.
The liquid crystal display device according to claim 1, wherein a minimum separation distance between adjacent two opaque portions on a light incident surface of the light collimating film is D1, and the single opaque portion The depth of the light incident surface with respect to the light collimating film is D2, and satisfies the formula: 0.1 ≤ D1/D2 ≤ 0.5.
The liquid crystal display device according to claim 1 or 2, wherein the quantum dot liquid crystal panel comprises:

a liquid crystal layer comprising a plurality of liquid crystal cells arranged in sequence;

a quantum dot layer disposed on a side of the liquid crystal layer away from the backlight, comprising a plurality of quantum dot pixel unit groups arranged in sequence, each of the quantum dot pixel unit groups including three quantum A dot pixel unit, each of the quantum dot pixel units being disposed in one-to-one correspondence with each of the liquid crystal cells.
The liquid crystal display device according to any one of claims 1 to 3, wherein each of the opaque portions has a sinker shape, and the sinker is formed by the light incident surface of the light collimating diaphragm The light collimates the shape of the inside of the diaphragm.
The liquid crystal display device according to claim 4, wherein each of the sinker-shaped opaque portions extends from one side of the light collimating film to the other opposite side so that each of the places The projection of the opaque portion on the quantum dot liquid crystal panel is located between two adjacent columns of quantum dot pixel units in the quantum dot liquid crystal panel.
The liquid crystal display device according to claim 4, wherein the light collimating film has a thickness of not more than 500 μm; and the depth of the single opaque portion with respect to the light incident surface of the light collimating film is D2 Less than 300 μm; the preset angle is about 30°.
The liquid crystal display device according to claim 4, wherein the sinking groove of the opaque portion is filled with a light absorbing material and a light reflecting material, and the light absorbing material is located in the sinking groove adjacent to the quantum dot liquid crystal panel. On the side, the reflective material is located on a side of the light absorbing material away from the quantum dot liquid crystal panel.
The liquid crystal display device according to claim 7, wherein the sinking groove is parallel to the light incident of the light collimating film in a direction in which the light collimating film is directed toward the quantum dot liquid crystal panel. The area of the cross section of the face is reduced or remains constant.
The liquid crystal display device according to claim 8, wherein the reflective material has a thickness of not less than 50 μm.
A liquid crystal display device according to claim 9, further comprising other optical components, the other optical components comprising a reflective sheet, the reflective sheet being disposed opposite to a light incident surface of the light collimating diaphragm, and being used by the light reflecting material The reflected light is reflected by the reflection sheet and re-injected into the light collimating film.
The liquid crystal display device according to claim 10, wherein the liquid crystal display device is a direct type liquid crystal display device, further comprising a groove type back plate disposed on a side of the reflection sheet away from the light collimation film The reflection sheet is of a groove type, and a groove bottom of the groove type reflection sheet is provided with a through hole through which a backlight passes, and the backlight passes through the through hole.
The liquid crystal display device according to claim 10, wherein the liquid crystal display device is a side-entry liquid crystal display device, further comprising a light guide plate disposed on the light collimating film away from the quantum dot One side of the liquid crystal panel is disposed on the light incident side of the light guide plate, and the reflective sheet is disposed on a side of the light guide plate away from the light collimating film.
The liquid crystal display device according to claim 6, wherein the light absorbing material has an absorbance of more than 0.8, and the light reflecting material has a light reflectance of more than 0.8.
The liquid crystal display device according to claim 8, wherein

a longitudinal section of the light absorbing material perpendicular to the light incident surface of the light collimating film is trapezoidal or curved, and a longitudinal section of the light reflecting material perpendicular to the light incident surface of the light collimating film is trapezoidal ;or

A longitudinal section of the light absorbing material perpendicular to the light incident surface of the light collimating film is rectangular, and a longitudinal section of the light reflecting material perpendicular to the light incident surface of the light collimating film is trapezoidal.
A backlight module comprising:

a backlight configured to emit light;

a light collimating film configured to receive light emitted by the backlight, the substrate of the light collimating film being a light transmissive material, wherein the light collimating film is adjacent to the light One side of the backlight is spaced apart from the plurality of opaque portions that are not transparent to the light of the backlight, and the plurality of opaque portions are configured to illuminate light from the light exit surface of the light collimating diaphragm. The exit angle is less than the preset angle.
The backlight module of claim 15, wherein a minimum distance between two adjacent opaque portions on a light incident surface of the light collimating film is D1, and the single opaque portion The predetermined depth with respect to the light incident surface of the light collimating film is D2, and satisfies the formula: 0.1 ≤ D1/D2 ≤ 0.5.
The backlight module according to claim 15 or 16, wherein each of the opaque portions has a sinker shape, and the sinking groove is formed by the light incident of the light collimating film toward the light. The shape in which the inside of the diaphragm is recessed.
The backlight module of claim 17, wherein the sinking groove of the opaque portion is filled with a light absorbing material and a light reflecting material, and the light absorbing material is located in the sinking groove away from the light collimating film. On one side of the glossy surface, the reflective material is located on a side of the light absorbing material adjacent to the light incident surface of the light collimating film.
The backlight module according to claim 18, wherein the sinking groove is parallel to the light entering the light-collecting film in a direction along a light-incident surface of the light-collimating film toward the light-emitting surface The area of the cross section of the face is reduced or remains constant.