CN112180495A - Light guide plate of backlight module and liquid crystal display device with same - Google Patents
Light guide plate of backlight module and liquid crystal display device with same Download PDFInfo
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- CN112180495A CN112180495A CN202011047480.9A CN202011047480A CN112180495A CN 112180495 A CN112180495 A CN 112180495A CN 202011047480 A CN202011047480 A CN 202011047480A CN 112180495 A CN112180495 A CN 112180495A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 101
- 239000012780 transparent material Substances 0.000 claims abstract description 6
- 239000000758 substrate Substances 0.000 claims description 33
- 230000003287 optical effect Effects 0.000 claims description 10
- 239000010408 film Substances 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 239000012788 optical film Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000011368 organic material Substances 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- 238000004590 computer program Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- 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
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
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- 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
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
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- 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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a light guide plate of a backlight module for a liquid crystal display device and the liquid crystal display device with the light guide plate, which are made of transparent materials and comprise a scattering reflection area and a non-scattering reflection area, wherein at least one of two opposite side surfaces of the light guide plate is a light incident surface; the scattering reflection region scatters and reflects light incident from the light incident surface uniformly and then emits the light from the light emitting surface; the non-scattering reflecting region directly transmits the light incident from the light incident surface to the side opposite to the light incident surface; the surface opposite to the light emergent surface in the thickness direction of the light guide plate is a natural light incident surface. The liquid crystal display device includes a liquid crystal panel in a transparent state in a non-powered state; and a backlight module comprising the light guide plate. The embodiment of the invention can provide the transparent liquid crystal display device which is transparent under the condition of no power-on. Moreover, the transparent effect of the liquid crystal display device in the state of displaying image information is greatly improved on the basis of not increasing the cost.
Description
Technical Field
The present invention relates to the field of liquid crystal display, and more particularly, to a light guide plate and a liquid crystal display device having the same.
Background
In a Liquid Crystal Display (LCD) Display, a BackLight Unit (BLU) is very important, which is a light source located behind the LCD, because the LCD does not emit light, and the light emitting effect of the BLU directly affects the visual effect of the LCD.
The BLU generally includes a Light source, a Light Guide Panel (LGP), a bottom reflector, an optical film, and structural members (back plate, frame, Light strip plate, etc.), etc. Wherein, the LGP is arranged at one side of the LCD for receiving the incident light, the light source is arranged at the side of the light guide plate, and the reflector plate is arranged at the outer side of the LGP in a surrounding way and used for reflecting the light. The LGP converts incident parallel light into planar light based on a light scattering principle, and light emitted from the LGP is diffused and polarized by the optical film material and is condensed by the light condensing prism sheet in the optical film material to adjust the light divergence angle, so that a required surface light source is formed and provided for the LCD. The LGP material itself in the conventional BLU is transparent, and when the LGP is formed, different dots are printed on the bottom side thereof, and light is scattered when it hits the dots, thereby forming a uniform surface light source.
However, with the development of display technology, various new technologies are emerging, and the transparent display technology is receiving more and more attention due to the characteristic of the transparent display panel and its unique application. A transparent display generally refers to a display that can be brought into a transparent display state so that a viewer can see an image displayed in the display and a scene behind the display. Transparent displays have many possible applications, such as windows in buildings or automobiles and displays in malls. In addition to the applications of these large devices, small devices such as handheld tablet computers may also benefit from a transparent display, for example, enabling a user to view a map and to view a scene in front through the screen.
Compared with the LCD, the OLED display screen is implemented by using active light-emitting elements, so that transparent display is easier to implement, but the OLED display screen has higher cost. Since the LCD display screen adopts a passive light emitting form, that is, a backlight source must be configured to display contents, and the opaque or scattering properties of the optical films such as the diffuser, the prism sheet, and the reflector in the current backlight module limit the transmission properties of the transparent display, a new backlight module capable of being applied to the transparent liquid crystal display device is needed.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a backlight module light guide plate capable of improving transparency, that is, a liquid crystal display device having the light guide plate.
In order to solve the above problems, embodiments of the present invention mainly provide the following technical solutions: a light guide plate is made of transparent materials and is characterized in that:
the light guide plate comprises a scattering reflection region and a non-scattering reflection region, wherein at least one of two opposite side surfaces of the light guide plate is a light incident surface;
the scattering reflection region scatters and reflects light incident from the light incident surface uniformly and then emits the light from the light emitting surface;
the non-scattering reflecting region directly transmits the light incident from the light incident surface to the side opposite to the light incident surface;
the surface opposite to the light emergent surface in the thickness direction of the light guide plate is a natural light incident surface.
Preferably, scattering points are arranged on the scattering reflection area, and the scattering points are not arranged on the non-scattering reflection area.
Preferably, the scattering reflection region and the non-scattering reflection region are arranged at intervals along a first direction of the light guide plate and extend along a second direction, the first direction is perpendicular to the second direction, and the light incident surface is arranged at the end of the second direction of the light guide plate.
Preferably, when the light guide plate enters light from one side, the density of scattering points of the scattering reflection area is gradually increased from the light entering side to the other side, and the size of the scattering points is unchanged;
or when the light guide plate enters light from one side, the scattering points in the scattering reflection area are from the light entrance side to the other side, the density of the scattering points is unchanged, and the size of the scattering points is gradually increased.
As another embodiment, when the light guide plate enters light from both sides, the scattering dots in the scattering reflection area gradually increase in density and are unchanged in size from the light entering side to the middle of the light guide plate;
or when the light guide plate enters light from two sides, the scattering points in the scattering reflection area are arranged from the light entrance side to the middle of the light guide plate, the density of the scattering points is unchanged, and the size of the scattering points is gradually increased.
A liquid crystal display device comprises a backlight module and a liquid crystal panel;
the liquid crystal panel is in a transparent state under a non-powered state;
the backlight module comprises the light guide plate and a light source positioned on at least one side of the light guide plate.
Preferably, the liquid crystal panel comprises substrates arranged at an upper interval and a lower interval, polaroids are respectively arranged on the outer side faces opposite to the substrates, a liquid crystal layer is arranged between the substrates arranged at the upper interval and the lower interval, one of the substrates and a transparent electrode and an orientation layer are arranged between the liquid crystal layer, the other substrate and the liquid crystal layer are provided with a color filter layer, a transparent electrode and an orientation layer, liquid crystal in the liquid crystal layer is parallel to the substrates when the liquid crystal is not powered on, the liquid crystal optical axis close to the substrate on one side is vertical to the substrates, and the liquid crystal optical axis gradually rotates for 90 degrees from the substrate on one side to the substrate on the other side.
Preferably, each pixel of the liquid crystal panel comprises four sub-pixels, namely a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel, each sub-pixel is provided with a thin film transistor device and a transparent electrode corresponding to each sub-pixel, and the white sub-pixel is in a transparent state in a charged state and a non-charged state.
Preferably, the red sub-pixel, the green sub-pixel and the blue sub-pixel correspond to a scattering reflection region in the light guide plate, and the white sub-pixel corresponds to a non-scattering reflection region in the light guide plate.
Preferably, the total area of the white sub-pixels in each pixel is greater than or equal to 1/4 and less than or equal to 1/3.
Preferably, the red sub-pixel, the green sub-pixel, the blue sub-pixel and the white sub-pixel are arranged repeatedly in sequence along the first direction, and extend along a second direction, and the sub-pixels of the same color are arranged in alignment along the second direction.
Preferably, a light reflecting film is arranged on the side surface of the light guide plate, which is not the light incident surface.
By the technical scheme, the technical scheme provided by the embodiment of the invention at least has the following advantages:
the light guide plate of the backlight module and the liquid crystal display device with the light guide plate can provide a transparent liquid crystal display device, and the liquid crystal display device is transparent under the condition of no power supply. Moreover, the transparent effect of the liquid crystal display device in the state of displaying image information is greatly improved on the basis of not increasing the cost through the special arrangement of the light guide plate and the special arrangement of the pixel position of the liquid crystal panel.
The foregoing description is only an overview of the technical solutions of the embodiments of the present invention, and the embodiments of the present invention can be implemented according to the content of the description in order to make the technical means of the embodiments of the present invention more clearly understood, and the detailed description of the embodiments of the present invention is provided below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the embodiments of the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic view of a liquid crystal panel according to an embodiment of the invention.
Fig. 2 is a front view of a light guide plate of a backlight module according to an embodiment of the invention.
Fig. 3a is a schematic view illustrating a distribution manner of scattering points on a light guide plate of a backlight module according to an embodiment of the invention when light enters from a single side, and fig. 3b is a schematic view illustrating another distribution manner of scattering points on the light guide plate of the backlight module according to an embodiment of the invention when light enters from a single side.
Fig. 4a is a schematic view illustrating a distribution manner of scattering points on a light guide plate of a backlight module according to an embodiment of the invention when light enters from two sides, and fig. 4b is a schematic view illustrating another distribution manner of scattering points on the light guide plate of the backlight module according to an embodiment of the invention when light enters from two sides.
Fig. 5 is a schematic view of a liquid crystal display device according to an embodiment of the invention.
Fig. 6 is a schematic view of a pixel structure on a liquid crystal panel according to an embodiment of the invention.
Fig. 7a is a schematic diagram (when not powered) illustrating the operation principle of the liquid crystal panel according to the embodiment of the present invention, and fig. 7b is a schematic diagram (when powered) illustrating the operation principle of the liquid crystal panel according to the embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 5, the liquid crystal display device according to the embodiment of the present invention includes a liquid crystal panel 200, a backlight module 100, and a fixing frame 300 disposed outside the liquid crystal panel 200 and the backlight module 100 and used for fixing the liquid crystal panel 200 and the backlight module, wherein the fixing frame is further provided with a driving circuit device such as a control circuit board. The liquid crystal display panel 200 is a liquid crystal display panel in a transparent state in a non-power-on state, and the backlight module 100 is also made of a transparent material, so that the whole liquid crystal display device can completely transmit light on the rear side in a power-off state.
As shown in fig. 1, the liquid crystal panel 200 includes substrates 201 disposed at an interval from top to bottom, the substrates 201 are made of transparent materials, polarizers 202 are disposed on opposite outer sides of the substrates 201, a liquid crystal layer 203 is disposed between the substrates 201 disposed at an interval from top to bottom, a transparent electrode 204 and an alignment layer 205 are disposed between one of the substrates 201 and the liquid crystal layer 203, and a color filter layer 206, a transparent electrode 204 and an alignment layer 205 are disposed between the other substrate and the liquid crystal layer 203. The materials of the liquid crystal panel are made of transparent materials, and the color filter layer 206 is disposed on the substrate 201 on the light incident side.
As a conventional solution in the art, the liquid crystal display device further includes a plurality of source lines and gate lines arranged in a matrix on the inner surface of the substrate 201, the source lines extending at intervals in one direction, the gate lines extending at intervals in another direction, the two directions being perpendicular to each other, and thin film transistor devices (TFTs) formed at positions where the gate lines and the source lines intersect, the TFTs being connected to the transparent electrodes 204 for driving the liquid crystal layer 203.
The liquid crystal panel 200 is a normally white liquid crystal panel, that is, the liquid crystal layer 203 is a liquid crystal panel in which, when no power is applied, the optical axes of the liquid crystal molecules in the liquid crystal layer 203 near one side substrate are parallel to the substrates, the optical axes of the liquid crystal molecules near the other side substrate are perpendicular to the substrates, and the optical axes of the liquid crystal molecules in the liquid crystal layer 203 are arranged from top to bottom, that is, in a manner of gradually rotating to 90 degrees in the thickness direction of the liquid crystal layer. Therefore, the liquid crystal layer 203 is equivalent to rotating the polarization state of the light incident thereon by 90 degrees, and the polarization directions of the upper and lower polarizers themselves in the liquid crystal panel 200 are perpendicular, i.e., at 90 degrees. Therefore, in the non-powered state, as shown in fig. 7a, the natural light incident from the liquid crystal panel 200 side can completely pass through the upper and lower polarizers and the liquid crystal layer, and the liquid crystal panel 200 is in a transparent state and completely passes through the background light source. Since the backlight module 100 is in the non-powered state, the whole liquid crystal display device is in a transparent state. As shown in fig. 7b, in the power-on state, the optical axis of the liquid crystal layer 203 is disposed perpendicular to the panel, and the optical axis in the liquid crystal layer 203 is rotated by the control of the transparent electrode 204, thereby modulating the light source incident from one side of the liquid crystal panel 200, and further displaying more image information.
Specifically, as shown in fig. 6, a plurality of pixels are distributed in a matrix, and each pixel includes four sub-pixels, namely a red sub-pixel 2071, a green sub-pixel 2072, a blue sub-pixel 2073 and a white sub-pixel 2074. Each sub-pixel is provided with a TFT and a transparent electrode corresponding to each sub-pixel, and voltage control can be separately performed. The white sub-pixel is in the same state in the charged and non-charged states, i.e. the voltage applied to the transparent electrode in the region is 0, the white sub-pixel 2074 is in the transparent state in the charged and non-charged states, and the red, green and blue sub-pixels are in different distortion states in the charged state, thereby displaying different image information.
And further, the color filter blocks on the color filter layer 206 correspond to sub-pixels in each pixel. And facilitates arranging filter patches on the color filter layer 206 and corresponding scattered dots in the backlight module.
In each pixel, a red sub-pixel 2071, a green sub-pixel 2072, a blue sub-pixel 2073 and a white sub-pixel 2074 are sequentially arranged in a first direction along the plane of the liquid crystal panel, and thus, in the first direction, as shown by the arrow a direction in fig. 3, the red, green, blue and white sub-pixels are sequentially and repeatedly arranged. In a second direction perpendicular to the first direction, as shown by arrow B in fig. 3, the same color sub-pixels are aligned along the second direction, and in the second direction, the same color sub-pixels are sequentially arranged in an extending manner. For example, in fig. 6, the first direction is a horizontal direction, the second direction is a vertical direction, red, green, blue, and white sub-pixels are repeatedly arranged in the horizontal direction, respectively, and such an arrangement is provided with a plurality of rows in the vertical direction. In the vertical direction, the sub-pixels of the same color are arranged in an extending way, and a vertical column of red sub-pixels, a vertical column of green sub-pixels, a vertical column of blue sub-pixels and a vertical column of white sub-pixels are respectively arranged in a plurality of columns along the horizontal direction.
The first direction and the second direction are respectively the directions of two vertical side edges of the liquid crystal panel, and can be perpendicular to each other.
As shown in fig. 1, 2 and 6, the backlight module 100 includes a light guide plate 101, and a light source 102 disposed on at least one side of the light guide plate 101, where the light source may be a point light source or a linear light source, and may be, for example, an elongated strip of light. The light guide plate 101 is a flat transparent member, the upper and lower surfaces of which are large surfaces, four sides opposite to each other in pairs are arranged around the light guide plate 101, the light emitting surface of the light source 102 is aligned with one side surface of the light guide plate 101, the side surface is a light source light incident surface 103, light incident on the light guide plate 101 is reflected and refracted uniformly by the light guide plate 101 and then is emitted from one large surface, namely a light emitting surface 104, of the light guide plate 101, so that the light source is provided for the whole liquid crystal panel. The light incident surface 103 is a side surface of the light guide plate 101, and the light guide plate 101 is a natural light incident surface opposite to the light emitting surface 104 in the thickness direction. In the case where no power is applied and no side light source is used, a natural light source is provided for the light guide plate 101.
As shown in fig. 2, the light guide plate 101 is distributed with scattering dots 1011, the distribution of the scattering dots 1011 matches with the sub-pixel positions on the liquid crystal panel, that is, the scattering dots are arranged at the positions corresponding to the red sub-pixel, the green sub-pixel and the blue sub-pixel, and the region is a scattering reflection region 1010; and at the position corresponding to the white sub-pixel, there is no scattering point, and the area is the non-scattering reflection area 1020. The scattering reflection region 1010 can uniformly scatter and reflect light incident from the light incident surface and emit the light from the light emitting surface, and the non-scattering reflection region 1020 directly transmits the light incident from the light incident surface to the side opposite to the light incident surface.
Therefore, when power is applied, the light source incident from one side of the light guide plate 101 is refracted and reflected by the scattering points 1011 to be incident on the liquid crystal panel disposed on the light emitting surface side of the light guide plate 101, and the light in the non-scattering reflective region directly passes through the light guide plate 101 in the lateral direction without being emitted from the light emitting surface. Therefore, the backlight of the non-scattering reflective region can penetrate through the light guide plate 101 and further penetrate through the liquid crystal panel, so that when the liquid crystal display device is in an electrified state, the modulated image information is displayed, and meanwhile, the backlight can be transmitted through the white sub-pixel, so that a transparent display state is formed. To distinguish the scattering reflection region from the non-scattering reflection region, it is preferable that an incident direction of the light source in the backlight module, which is incident on the light guide plate 101, is the same as an extending direction of the scattering reflection region and the non-scattering reflection region, for example, as shown in fig. 2, the scattering reflection region and the non-scattering reflection region are disposed at intervals along a first direction and both extend along a second direction, the light source is disposed on at least one end of side surfaces of opposite ends of the light guide plate 101 in the second direction, and the incident direction of the light source is the extending direction of the scattering reflection region and the non-scattering reflection region, that is, the incident direction is incident along the second direction.
In order to realize a state in which the light source is electrically turned on and the scattering reflective region scatters light on the light guide plate 101 and the non-scattering reflective region is transparent, the size of the scattering dots needs to be smaller than the pixel size by one order of magnitude or more. For example, a 65 inch 2k screen has a pixel size of about 744um, i.e. a subpixel width of 186um, while the size of the scattering dots may preferably be 30um-40 um. I.e. the size of the scattering dots differs by more than an order of magnitude from the width of the sub-pixels and the size of the scattering dots is smaller than the width of the sub-pixels.
As a preferred embodiment, as shown in fig. 2, at least one of two ends of the light guide plate 101 in the second direction, i.e., the direction of arrow B shown in the figure, is provided with a light source, and light reflecting sheets are respectively attached to the side surfaces of the light guide plate 101 at the two ends in the first direction, so that light does not leak from the side surfaces. The incident direction of the light source is along the second direction, and the red, green, blue and white sub-pixels extend along the second direction, and are repeatedly arranged along the first direction in sequence, namely the direction of an arrow A shown in the figure. The scattering reflection region extends along the second direction, the non-scattering reflection region also extends along the second direction, and the scattering reflection region and the non-scattering reflection region are arranged at intervals along the first direction in sequence. The red, green, blue and white sub-pixels are all the same width along the first direction. The scattering reflection region and the non-scattering reflection region extend along the second direction and are repeatedly arranged along the first direction at intervals.
Preferably, the light guide plate 101 is made of glass or a transparent organic material (e.g., PMMA), the scattering dots can be formed on the surface of the glass or the transparent organic material (e.g., PMMA) by silk screen printing, laser, stamping, or the like, or the particles can be doped in the glass or the transparent organic material (e.g., PMMA) to form a scattering body (bulk diffusion), and the diameter of the scattering dots is between 20 μm and 300 μm, preferably 40 μm to 100 μm. The scattering points can be in the shape of round convex points or concave points, or in the shape of an ellipse or a square, or in the shape of a pyramid, a prism and the like, as long as the light reflection and scattering effect can be realized. In order to enhance the light guiding effect of the transparent light guiding plate 101, a reflective film is attached to the non-incident side of the light guiding plate 101.
Preferably, in order to achieve the transparent effect of the liquid crystal display device, the total area of the transparent sub-pixels, i.e., the white sub-pixels, in each pixel should be 1/4 or more, 1/3 or less. Thus, the transmittance of light penetrating through the background can reach more than 20% in the power-on display state of the whole liquid crystal display device.
Specifically, when the red, green, blue, and white sub-pixels in the pixel extend in the second direction and are sequentially arranged in the first direction, the width of the white sub-pixel in the first direction needs to be greater than or equal to 1/4 of the width of the pixel in the first direction.
When the light guide plate enters light from one side, the density of scattering points on the scattering reflection area is increased from the light entering side to the other side opposite to the light guide plate, and the size of the scattering points is unchanged; or from the light incidence side to the opposite side of the light guide plate, the density of scattering points of the scattering reflection area is unchanged, and the size of the scattering points is gradually increased. Specifically, as shown in fig. 3a and 3b, the scattering reflective region and the non-scattering reflective region on the light guide plate extend along the second direction and are spaced apart along the first direction, and scattering points 1011 are disposed on the scattering reflective region in a matrix arrangement. As shown in fig. 3a, the light guide plate 101 has a light source at one end in the second direction, and the number of scattering dots 1011 in the scattering and reflecting area on the light guide plate gradually increases from the light incident side to the light incident side, so that the sizes of the scattering dots are uniform. Alternatively, as shown in fig. 3b, the number of scattering points 1011 on each row of scattering areas on the light guide plate is the same from the light incident side to the other side of the light guide plate, but the size of the scattering areas gradually increases. So that the light is uniformly spread in the light guide plate 101.
When the light enters from the two sides of the light guide plate, the density of scattering points on the scattering reflection area is increased from the light entering side to the middle of the light guide plate, and the size of the scattering points is unchanged; or from the light incidence side to the middle of the light guide plate, the density of scattering points in the scattering reflection area is unchanged, and the size of the scattering points is gradually increased. As shown in fig. 4a and 4b, the scattering reflective region and the non-scattering reflective region on the light guide plate extend along the second direction and are spaced apart along the first direction, and scattering dots 1011 are disposed on the scattering reflective region in a matrix arrangement. As shown in fig. 4a, the light sources are disposed at both ends of the light guide plate 101 in the second direction, and the size of each line scattering dot is kept constant from both sides of the light incident on the light guide plate 101 toward the middle of the light guide plate, the number of each line scattering dot is gradually increased, the number of the scattering dots at both ends of the light guide plate 101 is the smallest, and the number of the scattering dots at the middle is the largest. Alternatively, as shown in fig. 4b, the number of the scattering dots per row is kept constant from both sides of the light incident on the light guide plate 101 to the middle of the light guide plate, and the size of each scattering dot is gradually increased, that is, the size of the scattering dots at both ends of the light guide plate 101 is the smallest, and the size of the scattering dots at the middle is the largest.
The backlight module light guide plate and the liquid crystal display device with the light guide plate can provide a transparent liquid crystal display device, and the liquid crystal display device is transparent under the condition of no power supply. Moreover, the transparent effect of the liquid crystal display device in the state of displaying image information is greatly improved on the basis of not increasing the cost through the special arrangement of the light guide plate and the special arrangement of the pixel position of the liquid crystal panel.
It should also be noted that 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 the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (12)
1. A light guide plate is made of transparent materials and is characterized in that:
the light guide plate comprises a scattering reflection region (1010) and a non-scattering reflection region (1020), wherein at least one of two opposite side surfaces of the light guide plate is a light incident surface (103);
the scattering reflection region (1010) scatters and reflects light incident from the light incident surface (103) uniformly and then emits the light from the light emitting surface (104);
the non-scattering reflection region (1020) directly transmits the light incident from the light incident surface (103) to the side opposite to the light incident surface;
the surface opposite to the light emitting surface (104) in the thickness direction of the light guide plate is a natural light incident surface.
2. The light guide plate according to claim 1, wherein: scattering points (1011) are arranged on the scattering reflection area (1010), and the scattering points (1011) are not arranged on the non-scattering reflection area (1020).
3. The light guide plate according to claim 1, wherein: the scattering reflection region (1010) and the non-scattering reflection region (1020) are arranged at intervals along a first direction of the light guide plate and extend along a second direction, the first direction is perpendicular to the second direction, and the light incident surface (103) is arranged at the end part of the second direction of the light guide plate.
4. The light guide plate according to claim 2, wherein: when the light guide plate enters light from one side, scattering points of the scattering reflection area (1010) are gradually increased in density and unchanged in size from the light entering side to the other side;
or when the light guide plate enters light from one side, scattering points of the scattering reflection region (1010) are arranged from the light entrance side to the other side, the density of the scattering points is unchanged, and the size of the scattering points is gradually increased.
5. The light guide plate according to claim 2, wherein: when the light guide plate enters light from two sides, scattering points of the scattering reflection area (1010) are arranged from the light entrance side to the middle of the light guide plate, the density of the scattering points is gradually increased, and the size is unchanged;
or when the light guide plate enters light from two sides, scattering points of the scattering reflection region (1010) are arranged from the light entrance side to the middle of the light guide plate, the density of the scattering points is unchanged, and the size of the scattering points is gradually increased.
6. A liquid crystal display device includes a backlight module (100) and a liquid crystal panel (200);
the liquid crystal panel (100) is in a transparent state in a non-powered state;
the backlight module (100) comprises a light guide plate (101) according to any one of claims 1-5, and a light source (102) located at least at one side of the light guide plate.
7. The liquid crystal display device according to claim 6, wherein: the liquid crystal display panel (100) comprises substrates (201) arranged at an upper interval and a lower interval, a polaroid (202) is arranged on the outer side face of each substrate (201) opposite to each other, a liquid crystal layer (203) is arranged between the substrates (201) arranged at the upper interval and the lower interval, a transparent electrode (204) and an orientation layer (205) are arranged between each substrate (201) and the liquid crystal layer (203), a color filter layer (206), a transparent electrode (204) and an orientation layer (205) are arranged between each substrate (201) and the corresponding liquid crystal layer (203), liquid crystal in the liquid crystal layer (203) is parallel to the substrates when the substrates on one side are not powered up, the liquid crystal optical axis close to the substrates on the other side is perpendicular to the substrates, and the liquid crystal optical axis rotates for 90 degrees gradually from one substrate to the substrate on the other.
8. The liquid crystal display device according to claim 6 or 7, wherein: each pixel of the liquid crystal panel comprises four sub-pixels, namely a red sub-pixel (2071), a green sub-pixel (2072), a blue sub-pixel (2073) and a white sub-pixel (2074), each sub-pixel is respectively provided with a thin film transistor device and a transparent electrode which respectively correspond to the sub-pixels, and the white sub-pixel is in a transparent state in a power-on state and a power-off state.
9. The liquid crystal display device according to claim 8, wherein: the red (2071), green (2072) and blue (2073) subpixels correspond to diffuse reflective regions (1010) in the light guide plate, and the white (2074) subpixel corresponds to non-diffuse reflective regions (1020) in the light guide plate.
10. The liquid crystal display device according to claim 8, wherein: the total area of each pixel occupied by the white sub-pixels is greater than or equal to 1/4 and less than or equal to 1/3.
11. The liquid crystal display device according to claim 8, wherein: the red sub-pixels, the green sub-pixels, the blue sub-pixels and the white sub-pixels are sequentially and repeatedly arranged along the first direction, extend along the second direction, and are aligned with the same color sub-pixels in the second direction.
12. The liquid crystal display device according to claim 6, wherein: and a reflective film is arranged on the side surface of the light guide plate (101) which is not the light incident surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011047480.9A CN112180495A (en) | 2020-09-29 | 2020-09-29 | Light guide plate of backlight module and liquid crystal display device with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011047480.9A CN112180495A (en) | 2020-09-29 | 2020-09-29 | Light guide plate of backlight module and liquid crystal display device with same |
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| CN112180495A true CN112180495A (en) | 2021-01-05 |
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| CN202011047480.9A Pending CN112180495A (en) | 2020-09-29 | 2020-09-29 | Light guide plate of backlight module and liquid crystal display device with same |
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Application publication date: 20210105 |