CN111722313A - Light guide plate, lateral entrance type backlight module and liquid crystal display device - Google Patents
Light guide plate, lateral entrance type backlight module and liquid crystal display device Download PDFInfo
- Publication number
- CN111722313A CN111722313A CN202010716951.4A CN202010716951A CN111722313A CN 111722313 A CN111722313 A CN 111722313A CN 202010716951 A CN202010716951 A CN 202010716951A CN 111722313 A CN111722313 A CN 111722313A
- Authority
- CN
- China
- Prior art keywords
- light guide
- guide plate
- light
- liquid crystal
- display panel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Planar Illumination Modules (AREA)
Abstract
The embodiment of the application discloses a light guide plate, a side-in type backlight module and liquid crystal display equipment. In one embodiment, the light guide plate includes first and second opposite sides, and third and fourth opposite sides, the first side being a light incident side, and third and fourth side edges of the light guide plate being respectively formed as light guide regions doped with prism particles having irregular surfaces. This light guide plate is through forming the light guide region that is adulterated with the prism particle of irregular surface to play and break up incident light, form the effect of light diffuse reflection, make incident light distribute in the both sides of whole light guide plate more evenly, can promote the holistic luminance homogeneity of side income formula backlight unit, and then promote liquid crystal display equipment's luminance homogeneity, make it satisfy international medical treatment display standard, improve the added value of liquid crystal display product. And the light guide plate has simple structure, is easy to realize and is suitable for industrial mass production.
Description
Technical Field
The present application relates to the field of liquid crystal display technology. And more particularly, to a light guide plate, a side-entry backlight module and a liquid crystal display device.
Background
Liquid crystal display devices, which are light, thin and low in power consumption, are widely used in daily life and business applications such as car navigation, electronic books, photo frames, industrial equipment, televisions, personal computers, smart phones, tablet terminals, and the like. At present, with the development of the times, the display has more and more extensive applications in the medical industry, doctors need to judge the condition of patients by means of professional medical auxiliary facilities in the diagnosis process, and the display is used as a communication bridge between the condition of the patients and the judgment of the doctors and plays a vital role in the diagnosis process, so that the display can restore the condition of the patients more truly, the doctors can diagnose the patients accurately, and the display is a pain point to be updated and upgraded urgently in the liquid crystal display industry at present.
At present, professional diagnosis display products are used as high-end products in medical display products, and have extremely high requirements on product quality, wherein the symmetry of visual angles of the display products is highly symmetrical; at present, diagnostic display products show a trend of one-screen multiple use, and the brightness uniformity of the one-screen multiple use display products needs to meet the international medical display standard DIN 6868-157. Therefore, the production of the diagnostic display product needs high technical content, so that the mass production of the diagnostic display product is very difficult.
Disclosure of Invention
An object of the present application is to provide a light guide plate, a side-in type backlight module and a liquid crystal display device, so as to solve at least one of the problems existing in the prior art.
To achieve at least one of the above objects, a first aspect of the present application provides a light guide plate of a side-in type backlight module, the light guide plate including first and second opposite sides, and third and fourth opposite sides, the first side being a light incident side, and third and fourth side edges of the light guide plate being respectively formed as light guide regions doped with prism particles having irregular surfaces.
The light guide plate provided by the first aspect of the application has the advantages that the light guide region doped with the prism particles with irregular surfaces is formed, so that incident light rays are scattered, and light ray diffuse reflection is formed, the incident light rays are more uniformly distributed in the two side regions of the whole light guide plate, the integral brightness uniformity of the side-entry backlight module can be improved, and further the brightness uniformity of liquid crystal display equipment is improved, so that the brightness uniformity meets the international medical display standard DIN6868-157, and the brightness uniformity H of the liquid crystal display equipment is less than or equal to 20; the added value of the liquid crystal display device is improved; and the light guide plate has simple structure, is easy to realize and is suitable for industrial mass production.
In one embodiment, the second side edge of the light guide plate is formed as a light guide region doped with prism particles having irregular surfaces.
The light guide plate of this embodiment can further scatter incident light through the leaded light region that forms the prism particle that dopes irregular surface at the opposite side of income light side, forms light diffuse reflection for incident light distributes more evenly on the light guide plate, further promotes the luminance homogeneity of light guide plate.
In one embodiment, the middle position of the light guide plate is formed as a light guide region doped with the prism particles with irregular surfaces, and the light guide region doped with the prism particles with irregular surfaces formed at the middle position is substantially parallel to the light guide region doped with the prism particles with irregular surfaces formed at the third side edge of the light guide plate.
This embodiment can further break up incident light through the leaded light region that forms the prism particle that dopes irregular surface at the intermediate position, forms light diffuse reflection for incident light distributes more evenly at the intermediate position of light guide plate, can further promote the luminance homogeneity of light guide plate.
In one embodiment, the prism particles with irregular surfaces are prism particles with triangular pyramid shapes, and the inclined surfaces of the prism particles have irregular protrusions and depressions.
This embodiment is formed with irregular arch and sunken on the inclined plane of prism particle, further improves the prism particle and breaks up light, forms the effect of light diffuse reflection, guarantees the promotion effect of the luminance homogeneity of light guide plate.
In one embodiment, the prism particles have a height of between 45 and 55 microns and a base width of between 25 and 35 microns.
The second aspect of the present application provides a side-in type backlight module, which includes a light source and further includes the light guide plate provided by the first aspect of the present application.
In one embodiment, the lateral backlight module includes a reflective polarization brightness enhancement film, a first diffusion sheet and a second diffusion sheet sequentially stacked on a side of the light exit side away from the light guide plate.
The lateral backlight module structure of the embodiment can effectively avoid the abrupt change of the visual angle caused by the condensation effect of the prism sheet, thereby improving the symmetry of the visual angle of the lateral backlight module.
The third aspect of the present application provides a liquid crystal display device, including the lateral entrance type backlight module that the second aspect of the present application provided, still include the first display panel and the second display panel of concatenation, lateral entrance type backlight module is used for the first display panel of concatenation with the second display panel provides light.
In one embodiment, the second display panel is inverted in a display plane with respect to the first display panel.
This embodiment is through invering the second display panel to avoid prior art's liquid crystal display equipment because the direction that the liquid crystal molecule deflected is single, lead to liquid crystal display equipment's optical distribution skew, cause liquid crystal display equipment's left and right visual angle can not the complete symmetry, the relatively poor technical problem of visual angle symmetry, this embodiment can realize that the visual angle reaches the complete symmetry, promotes the absolute symmetry at visual angle, and then promotes liquid crystal display equipment's visual angle symmetry.
In an embodiment, a first light sensor is disposed in a region of the side-in backlight module corresponding to the first display panel, a second light sensor is disposed in a region corresponding to the second display panel, and the liquid crystal display device further includes a controller configured to adjust a light source of a partition of the corresponding first display panel and/or the corresponding second display panel according to a brightness sensed by the first light sensor and/or the second light sensor, respectively.
In the embodiment, the first optical sensor and the second optical sensor are configured, and the controller is used for adjusting the brightness of the partition light source of the corresponding first display panel and/or the corresponding second display panel at any time, so that the consistency of the display brightness of the first display panel and the second display panel is ensured, and the brightness uniformity of the liquid crystal display device is further improved.
In one embodiment, the liquid crystal display device is a medical diagnostic display device.
The beneficial effect of this application is as follows:
the application aims at the problems in the prior art, and provides a light guide plate of a side-in type backlight module, a side-in type backlight module and a liquid crystal display device, wherein a light guide area doped with prism particles with irregular surfaces is formed, so that incident light is scattered and diffused, the incident light is more uniformly distributed on the whole light guide plate, the integral brightness uniformity of the side-in type backlight module can be improved, the brightness uniformity of the liquid crystal display device is improved, the side-in type backlight module meets the international medical display standard DIN6868-157, the brightness uniformity H of the liquid crystal display device is less than or equal to 20, and the added value of the liquid crystal display device is improved; the light guide plate has a simple structure, is easy to realize and is suitable for industrial mass production; in addition, the side-in backlight module comprises a reflective polarized light brightness enhancement film, a first diffusion sheet and a second diffusion sheet which are sequentially stacked on one side of the light outlet side departing from the light guide plate, and the side-in backlight module structure can effectively avoid abrupt change of a visual angle caused by the condensation effect of the prism sheet, so that the visual angle symmetry of the side-in backlight module is improved; furthermore, the second display panel of the liquid crystal display device is inverted in the display plane relative to the first display panel, so that the technical problems that the left and right visual angles of the liquid crystal display device cannot be completely symmetrical and the visual angle symmetry is poor due to the fact that the liquid crystal display device in the prior art is single in liquid crystal molecule deflection direction and the optical distribution deviation of the liquid crystal display device is caused are solved, the liquid crystal display device can achieve complete symmetry of the visual angles, the absolute symmetry of the visual angles is improved, and the visual angle symmetry of the liquid crystal display device is improved.
Drawings
The following describes embodiments of the present application in further detail with reference to the accompanying drawings.
FIG. 1 shows a schematic diagram of the positions of measurement points for detecting the uniformity of an image display according to the International medical display Standard DIN 6868-157.
Fig. 2 shows a top view of a light guide plate and an LED light bar in the prior art.
Fig. 3 shows a top view of a light guide plate and an LED light bar in an embodiment of the present application.
Fig. 4 shows a flow chart of manufacturing a light guide plate in an embodiment of the present application.
Fig. 5 is a schematic diagram illustrating a contrast ratio of a backlight module with a prism sheet according to the related art.
Fig. 6 is a schematic diagram illustrating a contrast ratio of a backlight unit without a prism sheet in the related art.
Fig. 7 is a diagram showing a relationship between a viewing angle on the left and right sides of a liquid crystal display device and a contrast ratio in the related art.
Fig. 8 shows a schematic configuration diagram of a liquid crystal display device in an embodiment of the present application.
Fig. 9 shows a schematic configuration diagram of a liquid crystal display device in an embodiment of the present application.
Fig. 10 shows a schematic configuration diagram of a sensor and a controller in a liquid crystal display device in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is further noted that, in the description of the present application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It should be noted that, at present, diagnostic display products show a trend of one-screen multiple use, wherein the brightness uniformity of the one-screen multiple use display products needs to meet the international medical display standard.
According to the regulations in the international medical display standard DIN6868-157 regarding the uniformity of brightness of image displays as described above: the brightness of the image display is measured when 5 or 9 points on the diagonal are at 10% and 80% of the maximum digital control level (equal to DDL26 and DDL204 at 8 bits) according to the diagonal of the image display, and the specific measurement point positions are shown in fig. 1, where the k and z points in fig. 1 are 5 measurement points of the image display less than 23 inches, the g, k and z points are 9 measurement points of the image display greater than 23 inches, and the z point is the center measurement point. Taking a tiled screen image display smaller than 23 inches as an example, by dividing the tiled screen image display into two halves in bilateral symmetry, each half takes a luminance value calculator luminance uniformity H with 5 points k and z according to fig. 1:
H＝200×(Lhighest-Llowest)/(Lhighest+Llowest)
and the following requirements for uniformity of brightness must be satisfied between the z points of the two screens on the left and right sides:
H＝200×(Lhighest-Llowest)/(Lhighest+Llowest)
according to the provisions of the International medical display Standard DIN6868-157, the brightness uniformity H must satisfy H.ltoreq.20.
Derived by the formula:
H＝200×(Lhighest-Llowest)/(Lhighest+Llowest)≤20
(Lhighest-Llowest)/(Lhighest+Llowest)≤20÷200
(1-Llowest/Lhighest)/(1+Llowest/Lhighest)≤20÷200
Llowest/Lhighest≥82％
thus, L in the case of a liquid crystal display productlowest/LhighestAnd when the content is more than or equal to 82 percent, the requirement that the brightness uniformity H of the international medical display standard DIN6868-157 is less than or equal to 20 can be met. It can be understood that the brightness uniformity of the Backlight unit (BLU) is generally lower than that of the lcd product by 5%, that is, when the L of the Backlight unit is larger than the L of the lcd productlowest/LhighestWhen the content is more than or equal to 87 percent, the liquid crystal displayL of productlowest/Lhighest≥82％。
Therefore, the inventor deduces and finds that the L of the liquid crystal display product is required to be satisfied through the formulalowest/LhighestMore than or equal to 82 percent, thereby meeting the requirement that the brightness uniformity H of the liquid crystal display equipment is less than or equal to 20, and the key point is how to improve the L of the backlight modulelowest/LhighestTo be more than or equal to 87 percent.
In order to achieve at least one of the above objectives, an embodiment of the present invention provides a light guide plate 20 of a side-in type backlight module, and specifically, as shown in fig. 3, the light guide plate 20 is rectangular. In the embodiment shown in fig. 3 in which the light source (e.g., LED light bar) 30 is located at the lower side of the light guide plate 20, the side of the light guide plate 20 close to the light source, i.e., the lower side of the light guide plate 20 is the light incident side, in which case, the left and right edges of the light guide plate 20 are respectively formed as light guide regions 40 doped with irregular surface prism particles.
In another embodiment, if the light source is located at the left side of the light guide plate, that is, if the left side of the light guide plate is the light incident side, the upper and lower sides of the light guide plate are formed as light guide regions doped with prism particles having irregular surfaces.
Compare in light guide plate 10 and lamp strip 11 among the prior art as shown in fig. 2, light guide plate 20 as shown in fig. 3 is through setting up the leaded light region 40 of the prism particle of doping irregular surface at left side edge and right side edge, thereby play and break up the light of the light source outgoing of light guide plate downside income light side department promptly, form the effect of light diffuse reflection, make incident light distribute at the left side region and the right side region of whole light guide plate more evenly, thereby promote the holistic luminance homogeneity of side income formula backlight unit, make backlight unit's Llowest/LhighestNot less than 87%, thereby improving L of LCD device loaded with the light guide platelowest/LhighestMore than or equal to 82 percent, so that the liquid crystal display device meets the international medical display standard DIN6868-157, namely, the requirement that the brightness uniformity H of the liquid crystal display device is less than or equal to 20 is met, and the additional value of the liquid crystal display product is improved; the light guide plate 20 in this embodiment has a simple structure, is easy to implement, and is suitable for industrial mass production.The light guide plate 20 in this embodiment is suitable for a backlight module where the light guide plate 20 is located, and is used for providing light for two display panels which are spliced at the same time, for example, a medical diagnostic apparatus which adopts two display panels, and the like.
In a specific embodiment, as shown in fig. 3, the upper side edge of the light guide plate 20 is also formed as a light guide region 40 doped with prism particles having irregular surfaces. The light guide area doped with the prism particles with irregular surfaces is formed on the opposite side of the light incident side, so that light emitted by a light source at the light incident side can be further scattered, diffuse reflection of the light is formed, the incident light is uniformly distributed on the whole light guide plate, and the brightness uniformity of the light guide plate is further improved.
In a specific embodiment, as shown in fig. 3, the light guide region 40 doped with the prism particles having irregular surfaces is also formed at the middle position of the light guide plate 20, and the light guide region 40 doped with the prism particles having irregular surfaces formed at the middle position is substantially parallel to the light guide region 40 doped with the prism particles having irregular surfaces formed at the left edge or the right edge of the light guide plate 20. The light guide plate 20 may be regarded as being divided into a first portion of the light guide plate 21 and a second portion of the light guide plate 22 by the light guide region 40 formed at the intermediate position, and the light guide region 40 on the upper side of the first portion of the light guide plate 21 and the second portion of the light guide plate 22 are communicated with each other.
In the embodiment, the light guide region 40 doped with the prism particles with irregular surfaces is formed in the middle position, so that light emitted from the light source at the light inlet side can be further scattered to form light diffuse reflection, the incident light is uniformly distributed in the middle position of the light guide plate, and the brightness uniformity of the light guide plate can be further improved.
In a specific embodiment, the prism particles with irregular surfaces are prism particles with triangular pyramid shapes, the inclined surfaces of which have irregular protrusions and depressions. This embodiment is formed with irregular arch and sunken through the inclined plane at the prism particle, further improves the prism particle and breaks up incident light, forms the effect of light diffuse reflection, guarantees the promotion effect of the luminance homogeneity of light guide plate. In another specific embodiment, the prism particles have a height of between 45 microns and 55 microns and a base width of between 25 microns and 35 microns. In another specific embodiment, the prism particles are made of polyester resin.
In a specific example, the manufacturing process of the light guide plate 20 of this embodiment is as shown in fig. 4, first, after melting the material of the light guide plate 20, such as PC particles, the material is injected onto the substrate 60 at the first position by the first injection machine 50, and after a certain time of pressure saturation, the first part of the light guide plate 21 is molded; then the guide rail 70 moves the substrate 60 and the molded first portion of the light guide plate 21 to a second position, and the second and third injection machines 51 and 52 respectively inject a mixture doped with PC particles and irregular surface prism particles to both sides of the first portion of the light guide plate 21 to form light guide regions 40 on both sides of the first portion of the light guide plate 21; then the guide rail 70 moves the substrate 60 to a third position, the fourth injection machine 53 injects the melted PC particles to the left side of the light guiding region 40 on the left side of the first portion of light guiding plate 21, and the second portion of light guiding plate 22 is molded after a period of time of pressure saturation, it can be understood that the light guiding region 40 between the first portion of light guiding plate 21 and the second portion of light guiding plate 22 in this embodiment is the light guiding region 40 in the middle position; finally, the substrate 60 is moved to the fourth position by the guide rail 70, and the mixture of the PC particles and the prism particles with irregular surfaces is injected into the left side of the second portion of the light guide plate 22 and the upper sides of the first portion of the light guide plate 21 and the second portion of the light guide plate 22 by the fifth injection machine 54 to form the light guide region 40, thereby finally forming the light guide plate 20 as shown in fig. 3.
Another embodiment of the present application further provides a side-in type backlight module, which includes a light source 30 and a light guide plate 20 in the above embodiments. In the embodiment shown in fig. 3, the light source 30 is, for example, an LED light bar, and the light source 30 is located at the lower side of the light guide plate 20.
On the other hand, the inventors found that the liquid crystal display device of the related art having the prism sheet mounted thereon has a problem of poor viewing angle symmetry, and particularly as shown in fig. 5 to 6, the liquid crystal display device of the related art has a problem that a CR viewing angle at a horizontal 45 ° is abruptly changed due to a light condensing effect of the prism sheet, that is, a display content and a perceived display effect such as luminance are not uniform when the liquid crystal display panel is viewed from a horizontal 45 ° and the liquid crystal display panel is viewed from a horizontal 30 ° as shown in fig. 5.
In a specific embodiment, the edge-type backlight module includes a reflective polarization brightness enhancement film (DBEFdual brightness enhancement film), a first diffusion sheet and a second diffusion sheet, which are sequentially stacked on a side away from the light exit side of the light guide plate, that is, the reflective polarization brightness enhancement film, the first diffusion sheet and the second diffusion sheet are stacked from top to bottom, that is, the edge-type backlight module of the embodiment adopts a film material structure of DBEF + diffusion sheet.
The lateral backlight module structure of the embodiment can effectively avoid the abrupt change of the visual angle caused by the condensation effect of the prism sheet, thereby improving the symmetry of the visual angle of the lateral backlight module. For example, when a user views the liquid crystal display device equipped with the edge-type backlight module of the embodiment from different angles, such as 0 °, 30 °, 45 °, and 60 °, the display content and the perceived display effect, such as brightness, are consistent.
Another embodiment of the present application further provides a liquid crystal display device 80, which includes a lateral backlight module, and further includes a second display panel 82 of the first display panel 81, where the lateral backlight module is used to provide light for the first display panel 81 and the second display panel 82. In one specific embodiment, as shown in fig. 8 to 9, the first display panel 81 and the second display panel 82 are display panels with the same size and the same resolution, and the first display panel 81 and the second display panel 82 are disposed in a side-in type backlight module. The liquid crystal display device further includes a panel Black frame region 83(BM, Black matrix region) located between the first display panel 81 and the second display panel 82 and around the first display panel 81 and the second display panel 82, where the panel Black frame region 83 is used to prevent light from passing through, and improve the contrast of the liquid crystal display device 80. The light guide region 40 at the middle position of the light guide plate 20 corresponds to the panel black frame region 83 between the first display panel 81 and the second display panel 82. In another specific embodiment, the liquid crystal display device 80 is a medical diagnostic display device.
The liquid crystal display device 80 provided by this embodiment is suitable for an application scene in which brightness or sound is separately controlled for the first display panel 81 and the second display panel 82, or the first display panel 81 and the second display panel 82 can simultaneously display the same or different screens. In one specific embodiment, the first display panel 81 and the second display panel 82 of the liquid crystal display device 80 are used for displaying medical images after treatment. In another specific embodiment, the liquid crystal display device 80 of the embodiment is used for displaying medical images before diagnosis and the second display panel 81 is used for displaying medical images after treatment, or as shown in fig. 8 to 9, the first display panel 81 is used for displaying scanned images of a skeleton and internal organs, and the second display panel 82 is used for displaying a local enlarged image of the internal organs, so that the liquid crystal display device 80 of the embodiment is convenient for doctors to compare, and communication and diagnosis between doctors and patients are more intuitive and clear.
On the other hand, the inventors found that in the manufacturing process of the liquid crystal display device in the related art, a Rubbing alignment (Panel Rubbing) process of the display Panel is generally required so that the liquid crystal molecules form a pretilt angle of about 2 °. The pre-tilt angle refers to an included angle between the liquid crystal molecules and the substrate, and aims to provide an initial tilt direction for the liquid crystal molecules, so that the liquid crystal molecules tilt along the same direction under the action of an electric field, and the phenomenon of dark fringes caused by disturbance of the liquid crystal molecules is avoided. However, the existing liquid crystal display device has a single liquid crystal molecule deflection direction, which easily causes the optical distribution deviation of the liquid crystal display device, and particularly, as shown in fig. 7, the viewing angles of the left and right sides of the liquid crystal display device cannot be completely symmetrical, and the viewing angle symmetry is poor.
In a specific embodiment, the second display panel 82 is inverted in the display plane with respect to the first display panel 81, that is, the second display panel 82 is obtained by rotating the first display panel 81 by 180 ° clockwise or counterclockwise in the display plane. The display plane is a plane commonly displayed by the first display panel 81 and the second display panel 82.
This embodiment is through inverting second display panel 82, make the pretilt angle of the liquid crystal molecule in second display panel 82 rotate 180 in the display plane for the pretilt angle of the liquid crystal molecule in first display panel 81 promptly, thereby avoid prior art's liquid crystal display equipment because the direction that the liquid crystal molecule deflected is single, lead to liquid crystal display equipment's optical registration skew, cause liquid crystal display equipment's left and right visual angle can not the complete symmetry, the relatively poor technical problem of visual angle symmetry, liquid crystal display equipment 80 of this embodiment can realize that the visual angle of left and right sides reaches the complete symmetry, promote the absolute symmetry of visual angle, and then promote liquid crystal display equipment 80's visual angle symmetry.
The absolute symmetry of the viewing angles is that a user can clearly see all display contents on the screen from different directions, namely, the user can normally observe an image approved by the user in a direction perpendicular to the left side or the right side of the normal line by taking the vertical normal line of the screen as a reference. For example, when one user views from the left side of the liquid crystal display device 80 at 45 ° and the other user views from the right side of the liquid crystal display device 80 at 45 °, the display contents and the perceived display effects such as brightness should be consistent.
In a specific embodiment, as shown in fig. 10, the area of the side-type backlight module corresponding to the first display panel 81 is provided with a first light sensor 90, the area corresponding to the second display panel 82 is provided with a second light sensor 91, the liquid crystal display device 80 further includes a controller 92 configured to adjust the partitioned light sources of the corresponding first display panel 81 and/or the corresponding second display panel 82 according to the brightness sensed by the first light sensor 90 and/or the second light sensor 91, respectively, that is, the light source 30 is divided into a first light source region corresponding to the first display panel 81 and a second light source region corresponding to the second display panel 82, the controller 92 controls the brightness of the light emitted from the first light source region according to the brightness sensed by the first light sensor 90, and it is understood that, the controller 92 controls the brightness of the light emitted from the second light source region according to the brightness sensed by the second light sensor 91. In another specific embodiment, the controller is a bridge motherboard.
In this embodiment, by configuring the first optical sensor 90 and the second optical sensor 91, the brightness of the partitioned light sources of the corresponding first display panel 81 and/or the corresponding second display panel 82 is adjusted at any time by the controller 92, so as to ensure the uniformity of the display brightness of the first display panel 81 and the second display panel 82, and further improve the brightness uniformity of the liquid crystal display device 80. It can be understood that the brightness and the brightness uniformity of the lcd device 80 including the first display panel 81 and the second display panel 82 mainly depend on the brightness of the light source 30 (e.g., LED light bar) and the transmittance of the display panel, the brightness provided by the same LED light bar has no more than 5% error, and the contrast error between the transmittance of the first display panel 81 and the transmittance of the second display panel 82 is small, so that the lcd device of this embodiment can satisfy the optical requirement, i.e., the requirement of the brightness and the brightness uniformity.
It should be understood that the above-mentioned examples are given for the purpose of illustrating the present application clearly and not for the purpose of limiting the same, and that various other modifications and variations of the present invention may be made by those skilled in the art in light of the above teachings, and it is not intended to be exhaustive or to limit the invention to the precise form disclosed.
Claims (11)
1. The light guide plate of the side-in type backlight module comprises a first side and a second side which are opposite, and a third side and a fourth side which are opposite, wherein the first side is a light incident side, and the third side edge and the fourth side edge of the light guide plate are respectively formed into light guide regions doped with prism particles with irregular surfaces.
2. The light guide plate according to claim 1, wherein the second side edge of the light guide plate is formed as a light guide region doped with prism particles having irregular surfaces.
3. The light guide plate according to claim 1, wherein the middle position of the light guide plate is formed as a light guide region doped with the irregular surface prism particles, and the light guide region doped with the irregular surface prism particles formed at the middle position is substantially parallel to the light guide region doped with the irregular surface prism particles formed at the third side edge of the light guide plate.
4. The light guide plate according to claim 1, wherein the prism particles having irregular surfaces are prism particles having a triangular pyramid shape with inclined surfaces having irregular protrusions and depressions.
5. The light guide plate according to claim 4, wherein the prism particles have a height of 45 to 55 microns and a bottom width of 25 to 35 microns.
6. A side-in backlight module comprising a light source, and further comprising the light guide plate according to any one of claims 1 to 5.
7. The edge-lit backlight module of claim 6, wherein the edge-lit backlight module comprises a reflective polarization brightness enhancement film, a first diffuser and a second diffuser sequentially stacked on a side of the light exit side of the light guide plate.
8. A liquid crystal display device, comprising the lateral entrance type backlight module as claimed in claim 6 or 7, and further comprising a first display panel and a second display panel which are spliced, wherein the lateral entrance type backlight module is used for providing light for the first display panel and the second display panel which are spliced.
9. The liquid crystal display device according to claim 8, wherein the second display panel is inverted in a display plane with respect to the first display panel.
10. The LCD device of claim 8, wherein the area of the side-in type backlight module corresponding to the first display panel is provided with a first light sensor, the area corresponding to the second display panel is provided with a second light sensor, and the LCD device further comprises a controller configured to adjust the light source of the corresponding first display panel and/or the corresponding second display panel according to the brightness sensed by the first light sensor and/or the second light sensor.
11. The liquid crystal display device according to any one of claims 8 to 10, wherein the liquid crystal display device is a medical diagnostic display device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010716951.4A CN111722313A (en) | 2020-07-23 | 2020-07-23 | Light guide plate, lateral entrance type backlight module and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010716951.4A CN111722313A (en) | 2020-07-23 | 2020-07-23 | Light guide plate, lateral entrance type backlight module and liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111722313A true CN111722313A (en) | 2020-09-29 |
Family
ID=72573346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010716951.4A Pending CN111722313A (en) | 2020-07-23 | 2020-07-23 | Light guide plate, lateral entrance type backlight module and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111722313A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000260215A (en) * | 1999-03-05 | 2000-09-22 | Seiko Epson Corp | Lighting system and light guide system |
| CN102156320A (en) * | 2011-02-25 | 2011-08-17 | 深圳市华星光电技术有限公司 | Side-entrance type light guide plate assembly and backlight module |
| CN103292211A (en) * | 2012-08-21 | 2013-09-11 | 厦门天马微电子有限公司 | Backlight module of liquid crystal display and liquid crystal display |
| CN203298087U (en) * | 2013-06-03 | 2013-11-20 | Tcl宏齐科技（惠州）有限公司 | Light guiding plate, side-entering type backlight module and liquid crystal displaying equipment |
| CN103885117A (en) * | 2014-03-10 | 2014-06-25 | 京东方科技集团股份有限公司 | Light guide plate, backlight module and liquid crystal module |
| CN208888409U (en) * | 2018-10-22 | 2019-05-21 | 合肥京东方显示光源有限公司 | Edge-type light guide plate, side entrance back module and display device |
-
2020
- 2020-07-23 CN CN202010716951.4A patent/CN111722313A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000260215A (en) * | 1999-03-05 | 2000-09-22 | Seiko Epson Corp | Lighting system and light guide system |
| CN102156320A (en) * | 2011-02-25 | 2011-08-17 | 深圳市华星光电技术有限公司 | Side-entrance type light guide plate assembly and backlight module |
| CN103292211A (en) * | 2012-08-21 | 2013-09-11 | 厦门天马微电子有限公司 | Backlight module of liquid crystal display and liquid crystal display |
| CN203298087U (en) * | 2013-06-03 | 2013-11-20 | Tcl宏齐科技（惠州）有限公司 | Light guiding plate, side-entering type backlight module and liquid crystal displaying equipment |
| CN103885117A (en) * | 2014-03-10 | 2014-06-25 | 京东方科技集团股份有限公司 | Light guide plate, backlight module and liquid crystal module |
| CN208888409U (en) * | 2018-10-22 | 2019-05-21 | 合肥京东方显示光源有限公司 | Edge-type light guide plate, side entrance back module and display device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100380209C (en) | Viewing angle control apparatus and display device comprising same | |
| EP3418797A1 (en) | Switchable privacy screen device and manufacturing method thereof, and display device | |
| JP4586869B2 (en) | Liquid crystal display device and electronic device | |
| US9885904B2 (en) | Display device | |
| US6738118B2 (en) | Liquid crystal display device | |
| US8427601B2 (en) | Liquid crystal display with narrow angular range of incident light | |
| JP2005266215A (en) | Liquid crystal display device and resistance detection type touch panel | |
| TW594128B (en) | Liquid crystal display and electronic machine | |
| JP6689745B2 (en) | Display device | |
| CN100485477C (en) | Liquid crystal display device and electronic apparatus | |
| CN109188784B (en) | Display substrate, manufacturing method thereof and display device | |
| US20190004349A1 (en) | Display device | |
| CN109212848A (en) | Display panel assembly and display device | |
| CN211014929U (en) | Liquid crystal panel and display device | |
| CN111722313A (en) | Light guide plate, lateral entrance type backlight module and liquid crystal display device | |
| TW496986B (en) | Liquid crystal display device | |
| US6628360B2 (en) | Liquid crystal display device including liquid crystal layer having liquid crystal molecules homogeneously aligned | |
| US20200073156A1 (en) | Display device | |
| JPH0933882A (en) | Liquid crystal display device | |
| CN111123574B (en) | Display panel, display device and electronic equipment | |
| CN113406826B (en) | Liquid crystal display panel, preparation method of liquid crystal display panel and curved-surface type display | |
| JPH09113904A (en) | Liquid crystal display device and its diffusing plate | |
| WO2023102777A1 (en) | Display panel and display device | |
| CN111176013A (en) | Brightness enhancement film, backlight module and display device | |
| JP2023156021A (en) | liquid crystal display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |