WO2024051048A1 - Module de rétroéclairage et appareil d'affichage - Google Patents
Module de rétroéclairage et appareil d'affichage Download PDFInfo
- Publication number
- WO2024051048A1 WO2024051048A1 PCT/CN2022/143037 CN2022143037W WO2024051048A1 WO 2024051048 A1 WO2024051048 A1 WO 2024051048A1 CN 2022143037 W CN2022143037 W CN 2022143037W WO 2024051048 A1 WO2024051048 A1 WO 2024051048A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- backlight module
- prism sheet
- prism
- optical film
- Prior art date
Links
- 239000012788 optical film Substances 0.000 claims abstract description 65
- 238000009792 diffusion process Methods 0.000 claims description 74
- 238000010586 diagram Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000004642 Polyimide Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 238000005094 computer simulation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- LVYZJEPLMYTTGH-UHFFFAOYSA-H dialuminum chloride pentahydroxide dihydrate Chemical compound [Cl-].[Al+3].[OH-].[OH-].[Al+3].[OH-].[OH-].[OH-].O.O LVYZJEPLMYTTGH-UHFFFAOYSA-H 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
-
- 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
Definitions
- the present application relates to a display device and a backlight module, in particular to a side-lit backlight module and a display device including the side-lit backlight module.
- the structure of the existing backlight module usually includes two diffusion sheets and two prism sheets, where the two prism sheets are located between the two diffusion sheets. There are multiple scattering particles inside the diffuser. The light passes through the diffuser and is scattered by these scattering particles, making the emitted light uniform.
- the prism sheet can deflect the light to the direction of the normal viewing angle, so it has the effect of light collection and brightness. .
- the incident light needs to enter the prism sheet at a specific angle in order to be deflected to the direction of the normal viewing angle.
- the diffuser Since the diffuser has diffusing properties, that is, the low optical directivity of the diffuser will destroy the high directivity of the light guide plate, resulting in less light entering the prism sheet at an appropriate angle, and the light deflected to the direction of the normal viewing angle will also be reduced. thus decrease. Under such architectural conditions, it is difficult to further improve the luminance of existing backlight modules. Its most skewed light-emitting angle is about 60 degrees relative to the normal direction of the backlight module, and it also lacks directivity. The overall light-emitting energy is not limited to a specific angle, resulting in poor privacy protection.
- One embodiment of the present application provides a backlight module, which includes an optical film structure that can improve the light concentration at the outgoing viewing angle and the brightness at the front viewing angle.
- Another embodiment of the present application provides a display device including the above-mentioned backlight module.
- a backlight module provided by an embodiment of the present application includes a light guide plate, a light source, an optical film, a first prism sheet, and a second prism sheet.
- the light guide plate has a light incident surface and a first light exit surface adjacent to the light incident surface.
- the light source is arranged on the light incident surface of the light guide plate.
- the optical film is disposed on the first light-emitting surface of the light guide plate and includes a plurality of juxtaposed prisms, wherein each of the prisms extends along a long axis direction, and the long axis direction intersects with the light incident surface.
- the optical film also includes a second light-emitting surface, wherein the second light-emitting surface and the prism are located on opposite sides of the optical film.
- the first prism sheet overlaps the second light-emitting surface of the optical film.
- the second prism sheet overlaps the first prism sheet, wherein the first prism sheet is located between the optical film and the second prism
- the long axis direction is perpendicular to the light incident surface.
- the backlight module further includes a diffusion sheet, wherein the diffusion sheet is located between the light guide plate and the optical film, and the haze is not less than 60%.
- the haze of the diffuser sheet is not greater than 92.1%.
- the first prism sheet further includes a plurality of parallel first prism strips, wherein the first prism strips are located on the surface of the first prism sheet, and this surface is opposite to the rough surface, and the first prism strips are along the extends in a first direction, wherein the first direction intersects the long axis direction.
- the second prism sheet further includes a plurality of parallel second prism strips, and the second prism strips extend along a second direction, where the second direction is perpendicular to the first direction.
- the long axis direction is perpendicular to the first direction.
- each prism of the optical film includes a corner, wherein the corner faces the first light-emitting surface.
- edges and corners are at right angles.
- the prism faces the first light-emitting surface.
- the first prism sheet has a rough surface, wherein the rough surface is directly in contact with the second light-emitting surface.
- the backlight module further includes a first diffusion layer and a second diffusion layer.
- the first diffusion layer is closer to the optical film than the second diffusion layer, and the haze of the first diffusion layer is Less than the haze of the second diffusion layer.
- the first diffusion layer is located on the first prism sheet and faces the optical film.
- the second diffusion layer is formed on the second prism sheet and faces the first prism sheet.
- the haze of the first diffusion layer and the haze of the second diffusion layer are both no greater than 20%.
- a display device provided by another embodiment of the present application includes the above-mentioned backlight module and a display panel, wherein the display panel is disposed relative to the backlight module.
- this application uses the prisms of the optical film to increase the directivity of the light emitted by the light source and promote the concentration of the light.
- the prisms of the optical film further split the light to appropriate angles to increase the proportion of light that exits toward the front viewing angle after passing through the prism sheet. In this way, the light concentration at the viewing angle and the brightness at the front viewing angle of the backlight module can be improved.
- FIG. 1A shows a side view of a backlight module according to an embodiment of the present application.
- FIG. 1B is an exploded perspective view of the backlight module in the embodiment of FIG. 1A .
- FIG. 1C is a top view of the backlight module in FIG. 1A with the first prism sheet and the second prism sheet omitted.
- FIG. 1D is a top view of the first prism sheet in the embodiment of FIG. 1A .
- FIG. 1E is a top view of the second prism sheet in the embodiment of FIG. 1A .
- FIG. 2 shows a partial enlarged view of the first prism sheet in the embodiment of FIG. 1D.
- FIG. 3 is an exploded perspective view of the backlight module in another embodiment of the present application.
- FIG. 4A shows an exploded perspective view of the backlight module in another embodiment of the present application.
- FIG. 4B shows a light shape distribution brightness line chart of the combination of the first prism sheet and the second prism sheet with three different diaphragm haze combinations.
- FIG. 5A shows a spatial luminance distribution diagram of one embodiment of the backlight module of FIG. 3 .
- FIG. 5B shows the spatial luminance distribution diagram of the backlight module of the comparative example.
- FIG. 6 is a simplified schematic diagram of the path of light L1 in this embodiment.
- FIG. 7 illustrates a spatial luminance distribution diagram of the backlight module of the embodiment of FIG. 3 without prism sheets.
- FIG. 8 shows a side view of a display device according to an embodiment of the present application.
- the words “about”, “approximately” or “substantially” appearing in the content of this case not only cover the clearly stated values and ranges of values, but also cover what can be understood by a person with ordinary knowledge in the technical field to which the application belongs.
- the allowable deviation range where the deviation range can be determined by the error generated during measurement, and this error is caused, for example, by limitations of the measurement system or process conditions.
- “about” may mean within one or more standard deviations of the above numerical value, such as within ⁇ 5%, ⁇ 3%, or ⁇ 1%.
- Words such as “approximately”, “approximately” or “substantially” appearing in this text can be used to select acceptable deviation ranges or standard deviations based on optical properties, etching properties, mechanical properties or other properties, and are not solely based on one The standard deviation applies to all the above optical properties, etching properties, mechanical properties and other properties.
- FIG. 1A is a cross-sectional view of a backlight module according to an embodiment of the present application
- FIG. 1B is an exploded perspective view of the backlight module in FIG. 1A
- the backlight module 100 includes a light guide plate 110 , a light source 120 , an optical film 130 , a first prism sheet 140 and a second prism sheet 150 .
- the light guide plate 110 has a light incident surface 111 and a first light exit surface 112 adjacent to the light incident surface 111, and a light source 120 is provided next to the light guide plate 110.
- the light source 120 is disposed on the light incident surface 111 of the light guide plate 110 and can emit light L1 toward the light incident surface 111 .
- the normal direction N1 may be perpendicular to the first light-emitting surface 112 .
- the optical film 130 is disposed on the first light-emitting surface 112 and includes a second light-emitting surface 132 and a plurality of parallel prisms 131 .
- the second light-emitting surface 132 and the prism 131 are respectively located on both sides of the optical film 130 .
- Each prism 131 extends along the long axis direction E1, and the long axis direction E1 intersects the light incident surface 111 of the light guide plate 110, and each prism 131 faces the first light exit surface 112.
- the optical film 130 of the present application is located below the first prism sheet 140, and uses the light-splitting prism 131 to adjust the light from the light guide plate 110 to an angle suitable for the first prism sheet 140 to receive. In this way, it can be ensured that the light from the first light-emitting surface 112 has high directivity to meet the required brightness.
- the first prism sheet 140 is disposed on the optical film 130 and overlaps with the second light-emitting surface 132 of the optical film 130 .
- the second prism sheet 150 overlaps the first prism sheet 140
- the first prism sheet 140 is located between the optical film 130 and the second prism sheet 150 .
- the first prism sheet 140 also has a rough surface 142, and the rough surface 142 is in direct contact with the second light-emitting surface 132.
- this application improves the directivity of light through each prism 131 on the optical film 130 .
- this application arranges each prism 131 on the other side surface opposite to the second light-emitting surface 132. Compared with arranging each prism 131 on the second light-emitting surface 132, this arrangement It can also reduce energy consumption. As a result, when the first prism sheet 140 is in direct contact with the smooth second light-emitting surface 132, an adsorption problem will occur at the contact surface between the two.
- the present application uses the rough surface 142 of the first prism sheet 140 to prevent the two surfaces from being closely adhered to each other, thereby preventing the polymer layer in the optical film 130 and the polymer layer in the first prism sheet 140 from adsorbing each other, thereby improving the performance of the application. Dark shadows or water mark-like phenomena caused by adsorption effects.
- the rough surface 142 on the first prism sheet 140 can replace at least one diffusion sheet in the conventional backlight module, for example, replace the upper diffusion sheet in the conventional backlight module to maintain light uniformity.
- the aforementioned polymer layer may be made of, for example, polyethylene terephthalate (PET) or polyimide (PI).
- the rough surface 142 of the first prism sheet 140 may be a surface of the first diffusion layer 145 , and the first diffusion layer 145 has a plurality of diffusion particles DP. These diffusion particles DP are distributed on the outer surface, making the outer surface uneven.
- the method of causing the rough surface 142 to be uneven is not limited to this, and an uneven surface such as a hairline pattern or a sandblasting pattern may also be formed through imprinting or surface treatment of the mold. Therefore, the rough surface 142 does not need to have these diffusion particles DP.
- This application includes a light-splitting optical film 130, which not only improves the directivity, but also concentrates the overall light energy, and is more biased towards the normal direction N1 of the light guide plate 110, thereby making the most skewed The light angle drops to about 40 to 50 degrees.
- the first prism sheet 140 and the second prism sheet 150 can guide light, so that most of the light of the backlight module 100 can emit along the normal direction N1 of the light guide plate 110, thereby improving the front viewing angle. Brightness.
- FIG. 1C is a top view of the backlight module in FIG. 1A with the first prism sheet 140 and the second prism sheet 150 omitted.
- the light source 120 may have a plurality of light emitting diodes 121 arranged along the straight line SL1 .
- the light-emitting diodes 121 can be installed on a strip-shaped circuit substrate, so that the light-emitting diodes 121 can be arranged in a straight line, that is, along the straight line SL1.
- the straight line SL1 is parallel to the light incident surface 111 of the light guide plate 110 .
- the circuit substrate can be a Printed Circuit Board (PCB) or a Flexible Printed Circuit (FPC).
- the long axis direction E1 of the prism 131 of the optical film 130 may be perpendicular to the straight line SL1 (that is, the long axis direction E1 is perpendicular to the light incident surface 111 ), so that the light L1 can enter the prism 131 .
- the light source 120 includes a plurality of light emitting diodes 121 .
- the light source 120 may also be other types of light-emitting devices, such as cold cathode fluorescent lamps (CCFL). Therefore, FIGS. 1A to 1C are only for illustration, and the light source 120 is not limited to a light-emitting device (such as a light strip) including a plurality of light-emitting diodes 121 .
- the light guide plate 110 also has a bottom surface 113 , wherein the first light-emitting surface 112 and the bottom surface 113 are respectively located on both sides of the light guide plate 110 and face each other, as shown in FIG. 1A .
- the light source 120 emits light L1 toward the light incident surface 111
- the light L1 enters the light guide plate 110 from the light incident surface 111 , where the light L1 can be incident from the light incident surface 111 to the bottom surface 113 .
- the bottom surface 113 can reflect a part of the light L1.
- the bottom surface 113 can continuously reflect the light L1 in the light guide plate 110 through total reflection (TIR), and transmit the light L1 in the plane extension direction of the light guide plate 110.
- the other part of the light L1 uses the microstructure (not shown in the figure) arranged on the bottom surface 113 to destroy the total reflection, so that the traveling direction of the light L1 is changed, so that the light L1 leaves the light guide plate 110 from the first light-emitting surface 112 .
- the normal direction N1 of the light guide plate 110 is substantially equal to the normal direction of the optical film 130 , the first prism sheet 140 and the second prism sheet 150 .
- the light L1 After leaving the light guide plate 110, the light L1 enters the optical film 130 through the surface where the prism 131 is located, and can leave the optical film 130 through the second light-emitting surface 132.
- the prisms 131 of the optical film 130 can concentrate and emit the light L1 emitted from the first light exit surface 112 of the light guide plate 110, thereby producing the effect of improving directivity. Therefore, when the light L1 passes through the light guide plate 110 and the optical film 130 in sequence, it will be refracted by the prism 131 , so that the exit angle of the light L1 on the light guide plate 110 is not equal to the exit angle of the light L1 on the optical film 130 .
- the optical film 130 can also cause the light L1 to be deflected and emitted toward the normal direction N1 of the light guide plate 110, so as to improve the light concentration and front viewing angle brightness of the backlight module 100.
- FIG. 1D and 1E are top views of the prism sheets (ie, the first prism sheet 140 and the second prism sheet 150 ) in FIG. 1B , where FIG. 1D shows the first prism sheet 140 and FIG. 1E shows the second prism sheet. 150 pieces.
- the first prism sheet 140 further includes a plurality of first prism strips 143 .
- the first prism strips 143 are located on the first surface 144 .
- the first surface 144 and the rough surface 142 are respectively located on the first prism sheet 140 . both sides.
- the second prism sheet 150 has a second surface 154 and a plurality of second prism strips 153 located on the second surface 154, and the second surface 154 faces away from the first prism sheet 140.
- the thick lines represent the wave troughs between two adjacent first prism bars 143 , while the thin lines represent the wave peaks of each first prism bar 143 .
- the first prism strip 143 extends along the first direction D1, and the first direction D1 is perpendicular to the long axis direction E1 of the prism 131.
- the thick lines represent the wave troughs between two adjacent second prism bars 153 , while the thin lines represent the wave peaks of each second prism bar 153 .
- These second prism strips 153 extend along the second direction D2, and the second direction D2 is parallel to the long axis direction E1 of the prism 131.
- the optical film 130 , the first prism sheet 140 and the second prism sheet 150 are orthogonal to each other.
- the second direction D2 is perpendicular to the first direction D1 so that the first prism sheet 140 and the second prism sheet 150 can guide most of the light L1 along the It emits in the parallel normal direction N1 to further enhance the brightness of the front viewing angle.
- the first direction D1 and the second direction D2 are respectively perpendicular and parallel to the long axis direction E1.
- the first direction D1 and the second direction D2 may be neither parallel nor perpendicular to the long axis direction E1.
- each prism 131 on the optical film 130 has an edge 133 , and the tip of the edge 133 points toward the light guide plate 110 , which means that the prism 131 faces the first edge of the light guide plate 110 .
- the angle of the edge 133 is 90 degrees to ensure that the light splitting points after the light L1 passes through the optical film 130 are 45 ⁇ 5 degrees and 135 ⁇ 5 degrees, which are the optimal light splitting points.
- the angle of the edge 133 is not limited to 90 degrees, and may be greater than or less than 90 degrees.
- FIG. 3 is an exploded perspective view of a backlight module according to another embodiment of the present application. Please refer to FIG. 3 .
- the backlight module 300 of this embodiment is similar to the backlight module 100 of the previous embodiment.
- the backlight module 300 also includes a light guide plate 110, a light source 120, an optical film 130, a first prism sheet 140 and a second prism sheet 150.
- the backlight module 300 of this embodiment also includes a diffusion sheet 360 with a haze ranging from 60% to 92.1%, which is disposed between the light guide plate 110 and the optical film 130 .
- the haze of the diffusion sheet 360 is not less than 60%, the highly directional light from the first light exit surface 112 of the light guide plate 110 can be effectively hazed.
- the haze of the diffuser sheet 360 exceeds 92.1%, the brightness may be affected.
- FIG. 4A is an exploded perspective view of a backlight module according to another embodiment of the present application.
- the backlight module 400 of this embodiment is similar to the backlight module 100 of the previous embodiment.
- the backlight module 400 also includes a light guide plate 110, a light source 120, an optical film 130, a first prism sheet 140 and a second prism sheet 150.
- the backlight module 400 also includes a first diffusion layer 145 and a second diffusion layer 155. It is worth mentioning that the first diffusion layer 145 is closer to the optical film 130 than the second diffusion layer 155.
- the first diffusion layer 145 is located on the first prism sheet 140 and faces the optical film 130
- the second diffusion layer 155 is located on the second prism sheet 150 and faces the first prism sheet 140 .
- the light collection effect of the first prism sheet 140 is used to increase the brightness.
- the haze of the first diffusion layer 145 must be no more than 20% to prevent the light emission angle from being too confusing and reducing the overall brightness.
- both the first diffusion layer 145 and the second diffusion layer 155 of this embodiment have a plurality of diffusion particles DP, without affecting the respective light entrance angles of the first prism sheet 140 and the second prism sheet 150, the first The haze of both the diffusion layer 145 and the second diffusion layer 155 is no more than 20%, so as to avoid damaging the light collection property and to achieve a concealing effect.
- the haze of the first diffusion layer 145 is 10% and the haze of the second diffusion layer 155 is 20%.
- the brightness peak value at this time can reach 0.96.
- the peak brightness is about 0.85 (as shown by the long dotted line); when the haze of the first diffusion layer 145 and the haze of the second diffusion layer 155 are both 20%, When the haze of the diffusion layer 145 is 20% and the haze of the second diffusion layer 155 is 10%, the peak brightness is about 0.90 (as shown by the short dotted line).
- the haze of the first diffusion layer 145 is smaller than the haze of the second diffusion layer 155 , the effect of maintaining the brightness at the front viewing angle is more obvious on the premise of maintaining light collection at the light emission viewing angle.
- the haze of the first diffusion layer 145 may be smaller than the haze of the second diffusion layer 155.
- the peak brightness is about 0.90, even if the haze of the second diffusion layer 155 is increased until When the haze of the first diffusion layer 145 and the haze of the second diffusion layer 155 are both 20%, the peak brightness will be about 0.85. On the contrary, the brightness will be reduced. In this way, the brightness will not be reduced.
- Those skilled in the art are urged to further try to use a second diffusion layer 155 with a higher haze. Therefore, the combination in which the haze of the first diffusion layer 145 is smaller than the haze of the second diffusion layer 155 is not easily conceivable.
- FIG. 5A is a spatial luminance distribution diagram of one embodiment of the backlight module 300 of FIG. 3
- FIG. 5B is a spatial luminance distribution diagram of a comparative example of the present application.
- the embodiment of FIG. 5A and the comparative example of FIG. 5B both use a backlight module similar to the embodiment of FIG. 3 , which includes a light guide plate 110, a light source 120, an optical film 130, a first prism sheet 140 and a second prism sheet 150.
- a diffusion sheet 360 with a haze of 92.1% is also included
- a diffusion sheet 360 with a haze of 2% is also included.
- the spatial luminance distribution map is originally a color map.
- the spatial luminance distribution map is presented as a grayscale map, where the grayscale from light to dark represents the trend change of luminance from small to large.
- the main bright area in Figure 5A is located in the center area, and has two secondary bright areas near 3 o'clock and 9 o'clock. In these bright areas, the darker the gray scale, the higher the brightness; The dark parts of the remaining non-bright areas are the areas with the smallest luminance in the entire spatial luminance distribution.
- the spatial luminance distribution diagrams shown in Figure 5A and Figure 5B (and subsequent Figure 7) are all computer simulation diagrams.
- FIG. 5A simulates observing the luminance distribution by overlooking the backlight module 300.
- the vertical axis and the horizontal axis in FIG. 5A both represent angles, and the center of the intersection of the vertical axis and the horizontal axis can be represents the central axis of the light exit surface of the light guide plate (for example, the first light exit surface 112 of the light guide plate 110).
- FIG. 6 is a simplified schematic diagram of the path of light L1 in this embodiment.
- FIG. 6 only shows the light guide plate 110 and the light source 120 , and other structures located above the light guide plate 110 are simplified. Please refer to FIGS. 5A and 6 together.
- the center where the vertical axis and the horizontal axis in FIG. 5A intersect is equal to the central axis OB1 of the top light-emitting surface 602 of the backlight module 300 in FIG. 6 . It should be particularly noted that the top light-emitting surface 602 in FIG.
- the vertical axis angle in FIG. 5A is equivalent to the observation angle SA1 shown in FIG. 6 .
- the observation angle SA1 is the angle between the central axis OB1 and the observation direction OD1, and the absolute value of the observation angle SA1 is between 0 degrees and 90 degrees.
- the vertical axis angle in FIG. 5A is zero, it means that the angle between the observation direction OD1 and the central axis OB1 is zero. That is, the zero vertical axis angle means that the brightness of the backlight module 300 is observed from the central axis OB1.
- the observation direction OD1 When the vertical axis angle in FIG. 5A is a negative value, the observation direction OD1 will be biased towards the light incident surface 111 of the light guide plate 110 , that is, the negative vertical axis angle means observing the backlight from the side of the top light emitting surface 602 adjacent to the light incident surface 111 Module 300 brightness.
- the vertical axis angle in FIG. 5A when the vertical axis angle in FIG. 5A is a positive value, the observation direction OD1 will deviate from the light incident surface 111 of the light guide plate 110 , that is, the positive vertical axis angle represents the side away from the light incident surface 111 from the top light emitting surface 602 Observe the brightness of the backlight module 300 at the observation angle SA1 shown in FIG. 6 .
- the brightness change on the horizontal axis in FIG. 5A represents the brightness distribution between the left and right sides of the backlight module 300 in FIG. 6 .
- the prism sheets (such as the first prism sheet 140 and the second prism sheet 150 ) in the backlight module 300 can guide the light L1 , most of the light L1 of the backlight module 300 can be Emit along the normal direction N1.
- the light emission angle in both figures is close to the frontal angle of 0 degrees, the light emission angle in Figure 5A is about 2 degrees, which is smaller than the 7 degrees in the comparative example in Figure 5B.
- the brightness of the embodiment in Figure 5A is increased by 7% compared to the brightness of the comparative example in Figure 5B.
- FIG. 7 is a spatial luminance distribution diagram of the diffuser 360 with a haze of 92.1% combined with the optical film 130 .
- the light exit angle of the light L1 after passing through the diffuser 360 is about 64 degrees (not shown), which meets the required incident angle range (about 50 degrees to 64 degrees) when it subsequently enters the optical film 130 Upper limit.
- this structure also makes the light emission angle of the optical film 130 fall between 72 degrees and 74 degrees, which is in line with the appropriate light emission angle range (about 68 degrees to 74 degrees) to facilitate The light then enters the prism sheet.
- the appropriate light angle range is derived from the analysis results of light inverse tracing when the light angle is closest to 0 degrees and has the best brightness. After derivation, it can be obtained that the light exit angle that the light L1 needs to reach before entering the first prism sheet 140 is 68 degrees (that is, the light exit angle of the light leaving the optical film 130 is 68 degrees).
- the diffusion sheet 360 in the haze range of 60% to 92.1% all has the ability to improve the brightness at the front viewing angle. Effect.
- the haze of the diffuser sheet 360 may fall within a range of less than 92.1% and greater than 60%, such as 70% or 85%.
- the brightness gain of the diffuser 360 with a haze of 85% can reach 103%.
- FIG. 8 is a side view of a display device according to an embodiment of the present application.
- the display device 80 includes a backlight module 800 and a display panel 820 .
- the display panel 820 is arranged relative to the backlight module 800 and is located above the light exit surface of the backlight module 800 so that the backlight module 800 can face
- the display panel 820 emits light.
- the backlight module 800 may be the backlight modules 100 and 300 in the aforementioned embodiments. Therefore, the backlight module 800 also includes a light guide plate 110, a light source 120, an optical film 130, a first prism sheet 140 and a second prism sheet 150, or at least one diffusion sheet 360.
- the display panel 820 may be a transmissive display panel, such as a liquid crystal display panel. Since the optical film 130 can promote the concentrated emission of the light L1 to improve the light directivity of the backlight module 800, the backlight module 800 and the display device 80 can have both high light viewing angle light collection and front viewing angle brightness characteristics. In addition, the rough surface 142 between the mutually stacked optical films 130 and the first prism sheet 140 in this application can improve the adsorption phenomenon between the optical films, thereby improving the optical quality of the display device 80 .
- the prisms of the optical film can improve the directivity of the light emitted by the light source and promote the concentration of the light.
- the prisms of the optical film further split the light to appropriate angles to effectively enter the prism sheet.
- the arrangement of two layers of prism sheets can guide light so that most of the light from the backlight module can emit along the normal direction. In this way, the light concentration at the viewing angle and the brightness at the front viewing angle of the backlight module can be improved.
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)
- Planar Illumination Modules (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
L'invention concerne un module de rétroéclairage (100, 300, 800), comprenant une plaque de guidage de lumière (110), des sources de lumière (120), un film optique (130), une première feuille de prisme (140) et une seconde feuille de prisme (150). Les sources de lumière (120) sont disposées de manière adjacente sur une surface d'incidence de lumière (111) de la plaque de guidage de lumière (110), et le film optique (130) est situé sur une première surface de sortie de lumière (112) sur la plaque de guidage de lumière (110). Le film optique (130) comprend une pluralité de prismes parallèles (131), et chaque prisme (131) s'étend le long d'une direction d'axe long (E1) croisant la surface d'incidence de lumière (111). Les prismes (131) sont situés sur un côté du film optique (130), et l'autre côté du film optique (130) a en outre une seconde surface de sortie de lumière (132). La première feuille de prisme (140) chevauche la seconde surface de sortie de lumière (132), et la seconde feuille de prisme (150) chevauche la première feuille de prisme (140).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202211077652.6 | 2022-09-05 | ||
CN202211077652 | 2022-09-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2024051048A1 true WO2024051048A1 (fr) | 2024-03-14 |
Family
ID=89232691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2022/143037 WO2024051048A1 (fr) | 2022-09-05 | 2022-12-28 | Module de rétroéclairage et appareil d'affichage |
Country Status (3)
Country | Link |
---|---|
CN (1) | CN220252346U (fr) |
TW (1) | TW202411747A (fr) |
WO (1) | WO2024051048A1 (fr) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010147012A (ja) * | 2008-12-22 | 2010-07-01 | Panasonic Electric Works Co Ltd | 面光源装置および表示用照明器具 |
CN203413546U (zh) * | 2013-06-28 | 2014-01-29 | 3M材料技术(广州)有限公司 | 光学膜层、背光模组和液晶显示装置 |
CN208239762U (zh) * | 2018-03-02 | 2018-12-14 | 扬升照明股份有限公司 | 光源模块及双荧幕显示装置 |
CN112015000A (zh) * | 2019-05-29 | 2020-12-01 | 中强光电股份有限公司 | 背光模块及显示装置 |
CN112014918A (zh) * | 2019-05-29 | 2020-12-01 | 台湾扬昕股份有限公司 | 背光模块 |
CN215769109U (zh) * | 2021-08-25 | 2022-02-08 | 中强光电股份有限公司 | 背光模块 |
-
2022
- 2022-12-23 TW TW111149608A patent/TW202411747A/zh unknown
- 2022-12-28 WO PCT/CN2022/143037 patent/WO2024051048A1/fr unknown
-
2023
- 2023-06-13 CN CN202321502977.4U patent/CN220252346U/zh active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010147012A (ja) * | 2008-12-22 | 2010-07-01 | Panasonic Electric Works Co Ltd | 面光源装置および表示用照明器具 |
CN203413546U (zh) * | 2013-06-28 | 2014-01-29 | 3M材料技术(广州)有限公司 | 光学膜层、背光模组和液晶显示装置 |
CN208239762U (zh) * | 2018-03-02 | 2018-12-14 | 扬升照明股份有限公司 | 光源模块及双荧幕显示装置 |
CN112015000A (zh) * | 2019-05-29 | 2020-12-01 | 中强光电股份有限公司 | 背光模块及显示装置 |
CN112014918A (zh) * | 2019-05-29 | 2020-12-01 | 台湾扬昕股份有限公司 | 背光模块 |
CN215769109U (zh) * | 2021-08-25 | 2022-02-08 | 中强光电股份有限公司 | 背光模块 |
Also Published As
Publication number | Publication date |
---|---|
TW202411747A (zh) | 2024-03-16 |
CN220252346U (zh) | 2023-12-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10488708B2 (en) | Backlight module | |
TWI815497B (zh) | 顯示裝置及其背光模組 | |
US11333820B2 (en) | Optical film and backlight module | |
US20080117355A1 (en) | Surface light source device and liquid crystal display device | |
CN101749601B (zh) | 背光模块及具有其的显示器 | |
US20220113591A1 (en) | Diffusion plate and backlight module | |
US20180157115A1 (en) | Edge-lit backlight device and liquid crystal display device | |
US8419258B2 (en) | Light guide plate, and backlight unit | |
KR20160051292A (ko) | 렌즈, 렌즈를 포함하는 발광 장치, 및 발광 장치를 포함하는 백 라이트 유닛 | |
KR100784021B1 (ko) | 액정 표시 장치의 백라이트 유니트 | |
US8405796B2 (en) | Illumination device, surface light source device, and liquid crystal display device | |
WO2013149410A1 (fr) | Dispositif d'affichage à cristaux liquides | |
KR20140075355A (ko) | 액정표시장치 | |
WO2024051048A1 (fr) | Module de rétroéclairage et appareil d'affichage | |
US20080136997A1 (en) | Liquid crystal display device | |
CN218917868U (zh) | 光扩散板及背光模组 | |
US11487056B2 (en) | Light guide plate and backlight module using the same | |
US9086592B2 (en) | Direct illumination type backlight module, bottom reflector and liquid crystal display | |
US8917366B2 (en) | Liquid crystal display device | |
CN203745767U (zh) | 一种液晶显示器 | |
US20240159953A1 (en) | Display device and backlight module thereof | |
KR200413319Y1 (ko) | 액정표시장치의 도광판 | |
KR101075272B1 (ko) | 백라이트유닛 | |
TW201721254A (zh) | 背光模組 | |
WO2015089858A1 (fr) | Plaque guide de lumière, module de rétroéclairage et dispositif d'affichage à cristaux liquide |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22958004 Country of ref document: EP Kind code of ref document: A1 |