CN113985516A - Backlight and display device - Google Patents
Backlight and display device Download PDFInfo
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- CN113985516A CN113985516A CN202111293190.7A CN202111293190A CN113985516A CN 113985516 A CN113985516 A CN 113985516A CN 202111293190 A CN202111293190 A CN 202111293190A CN 113985516 A CN113985516 A CN 113985516A
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- 238000000034 method Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 239000004973 liquid crystal related substance Substances 0.000 claims description 9
- 230000002596 correlated effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 15
- 238000005286 illumination Methods 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 230000000875 corresponding effect Effects 0.000 description 7
- 238000005070 sampling Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 206010066054 Dysmorphism Diseases 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000012788 optical film Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000003247 decreasing 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
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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
Abstract
The invention discloses a backlight source and a display device, wherein the backlight source comprises: the light guide plate is arranged on the light guide plate, and at least one side surface of the light guide plate is a light incident surface. The density of the dots distributed in the first preset area on the bottom surface of the light guide plate is greater than that of the dots in the reference area, wherein the first preset area covers a non-direct-illumination area in the bottom surface of the light guide plate, the reference area is other areas with the vertical distance from the light-emitting strips equal to that of the first preset area, the non-direct-illumination area is an area beyond the direct-illumination range of the light-emitting strips, and the density of the dots is the ratio of the area of the distributed dots in the area of the first preset area. The light trend is adjusted by increasing the density of the mesh points in the first preset area on the bottom surface of the light guide plate, so that the shadow formed in the non-direct-projection area of the light guide plate under the limitation of a special-shaped structure is favorably improved, the brightness uniformity of the light guide plate is improved, and a better display effect is achieved.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a backlight source and a display device.
Background
With the development of display technology, a side-emitting backlight is the mainstream light source of the existing liquid crystal display screen. The light guide plate is an important component of a side-emitting backlight, and the brightness uniformity of the light guide plate is one of important factors affecting the display effect. However, along with the demand to liquid crystal display district shape is abundant day by day, to some dysmorphism display products, the structure restriction that receives the dysmorphism region is arranged to luminous strip in the backlight, and the light direct projection scope of luminous strip is difficult to cover the dysmorphism region completely, and this just leads to the dysmorphism region dark partially easily for the whole light emitting area of light guide plate is bright dark inequality, thereby influences liquid crystal display's display effect.
Disclosure of Invention
The invention provides a backlight source and a display device, which can effectively solve the problems.
In a first aspect, an embodiment of the present invention provides a backlight, including: the light guide plate comprises light emitting strips and a light guide plate, wherein at least one side surface of the light guide plate is a light incident surface, the light emitting strips are arranged on the light incident surface of the light guide plate, and the width of the light emitting strips is smaller than that of the light guide plate along the extending direction of the light emitting strips;
the density of the dots distributed in a first preset area on the bottom surface of the light guide plate is greater than that of the dots in a reference area, wherein the first preset area covers a non-direct-radiation area of the light guide plate, the reference area is the other area in the bottom surface of the light guide plate, the vertical distance from the bottom surface of the light guide plate to the light-emitting strips is equal to that of the first preset area, the non-direct-radiation area exceeds the direct-radiation range of the light-emitting strips, and the density of the dots is the ratio of the area of the distributed dots in the area of the first preset area.
Further, the dot density of the first preset area is more than 89%.
Furthermore, first mesh points and second mesh points are distributed in the first preset area, the area of the second mesh points is smaller than that of the first mesh points, and the second mesh points are distributed in gap areas between adjacent first mesh points.
Further, the reference region is also distributed with the first dots, and the first dot density of the first preset region is equal to that of the reference region.
Furthermore, the first mesh point is formed by processing through a mesh point hitting technology, and the second mesh point is formed by processing through a laser technology.
Furthermore, third screen dots are arranged in a second preset area, opposite to the first preset area, of the light emitting surface of the light guide plate, wherein the light emitting surface is the surface opposite to the bottom surface of the light guide plate.
Further, the second preset region includes a first sub-region and a second sub-region adjacent to the first sub-region, the first sub-region is a region opposite to the first preset region, the third dot density arranged in the second sub-region is less than the third dot density arranged in the first sub-region, and the interval between adjacent dots in the second sub-region is positively correlated with the distance from the first sub-region.
Further, the area of the second sub-area is 1.5-3 times of the area of the first sub-area.
Further, the first size in the second preset area is smaller than the second size, the first size is along the width of the extending direction of the light-emitting strip, and the second size is along the length of the light-emitting strip in the perpendicular direction.
In a second aspect, an embodiment of the present invention provides a display device, including the backlight provided in the first aspect, and a liquid crystal display panel stacked with the backlight.
According to the backlight source and the display device provided by the embodiment of the invention, on the basis of the mesh point distribution of the traditional light guide plate, the mesh point density of the first preset area on the bottom surface of the light guide plate is increased to adjust the light trend, so that the mesh point density distributed in the first preset area is greater than the mesh point density of the reference area, light emitted into the first preset area from the peripheral area is emitted from the light emitting area corresponding to the first preset area more, the brightness of the area is compensated, the improvement of a dark shadow formed in a non-direct-projection area of the light guide plate limited by a special-shaped structure is facilitated, the brightness uniformity of the light guide plate is improved, and a better display effect is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a backlight source according to an embodiment of the disclosure;
FIG. 2 is a schematic diagram of a portion of a rounded corner display product according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating the simulation test effect of direct light irradiation according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a bottom structure of a light guide plate according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a theoretical dot arrangement according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a structure of a light exit surface of a light guide plate according to an embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating the locations of test sampling points according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the invention.
Detailed Description
In the description of the present invention, it is to be noted that technical terms or scientific terms used herein should have the ordinary meaning as understood by those having ordinary skill in the art to which the present invention belongs, unless otherwise defined. The terms "center", "upper", "lower", "left", "right", and the like, refer to an orientation or positional relationship based on an orientation or positional relationship shown in the drawings, or an orientation or positional relationship in which the product of the present invention is used, which is merely for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
It should also be noted that the word "comprise" or "comprises", and the like, means that the element or item preceding the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "disposed," "connected," or "coupled" and the like are to be construed broadly and are not to be limited to physical or mechanical connections, as those skilled in the art will understand in detail the specific meaning of the terms in the context of the invention. Herein, the bottom surface of the light guide plate means a surface close to the reflective sheet; the light-emitting surface of the light guide plate is the surface close to the optical film group, opposite to the bottom surface, and can also be called as the front surface.
The light guide plate is an important component of the backlight source, and the optical design principle is as follows: the light emitted by the light-emitting strip is transmitted to the far end of the light guide plate by utilizing the total reflection principle; the total reflection of the light in the light guide plate is destroyed by the mesh points arranged on the bottom surface of the light guide plate, so that the light is emitted out of the light guide plate. In order to better understand the technical solution provided by the embodiment of the present invention, the following briefly describes the principle of the light guide plate.
When the light guide plate has no mesh points, in the process of light conduction in the light guide plate, the incident angle of light emitted from the light emitting strip when the light is incident on the light incident side of the light guide plate is alpha, the interface refraction angle is beta, the incident angle of the light emitted from the interface is theta, the critical angle of total reflection occurring on the light emitting surface is C, and the critical angle is obtained easily according to the law of refraction and the law of total reflection:
β+θ＝90° (2)
the maximum α angle is taken as an example for analysis, i.e., α is 90 ° and β is also the maximum, β is 42.15 ° calculated from equation (1), θ is 90 ° -42.15 ° which is the minimum according to equation (2) is 47.85 °, and the critical angle C is 42.15 ° according to equation (3).
Therefore, the minimum angle θ is still larger than the critical angle C of total reflection, so that when there is no dot distribution, all light entering the light guide plate is reflected and no light is refracted inside, and therefore, the total reflection occurring in the light guide plate must be destroyed in order for the light to exit the upper surface.
Therefore, in order to destroy partial total reflection in the light guide plate, the bottom surface of the light guide plate is provided with the mesh points. After the dot structure is added, a part of light is still totally reflected at a large angle, and the light is transmitted to a farther place; part of light rays directly penetrate through the mesh points and are emitted from the bottom surface, and then enter the light guide plate again after being reflected by the reflector plate, wherein most of light rays are emitted from the front surface (light emitting surface) of the light guide plate; part of the light rays pass through the mesh points, the reflection angle is changed, and the light rays are directly emitted from the front surface after reaching the upper surface. That is to say, through set up the site at the light guide plate bottom surface, can make the light that the side light strip sent go out from the light guide plate front comparatively evenly to incide to display panel after further handling through the optical film material.
Therefore, the brightness uniformity of the light emitted from the front of the light guide plate is one of the key factors affecting the display effect. Traditional light guide plate design is for setting up even mesh point not different in the light guide plate bottom surface and adjusting whole face luminous homogeneity, and specific design is: and adjusting the arrangement density of the mesh points in the direction vertical to the light-emitting strips, wherein the closer to the light-emitting strips, the smaller the arrangement density of the mesh points is, and conversely, the farther from the light-emitting strips, the larger the arrangement density of the mesh points is.
However, for some special-shaped display products, the arrangement of the light-emitting strips in the backlight source is limited by the structure of the special-shaped area, the direct light irradiation range of the light-emitting strips is difficult to completely cover the special-shaped area, and even if the arrangement is performed, the problem that the special-shaped area is dark easily occurs, so that the whole light-emitting surface of the light guide plate is uneven in brightness, and the display effect of the liquid crystal display screen is influenced.
In view of this, in the embodiments of the present invention, on the basis of the distribution of the dots of the conventional light guide plate, the dot density of the first preset region on the bottom surface of the light guide plate is increased to adjust the light direction, so that the light entering the first preset region from the peripheral region is emitted from the light emitting region corresponding to the first preset region more, so as to compensate the brightness of the region, thereby facilitating improvement of a dark shadow formed in the non-direct light region of the light guide plate due to the limitation of the special-shaped structure, improving the brightness uniformity of the light guide plate, and achieving a better display effect.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention. In addition, the thickness, size, and shape of the structures in the drawings do not reflect the true scale of the elements in the optical path structure, and are intended to schematically illustrate the present disclosure.
It should be noted that, in the following description, for convenience of understanding, the round-corner special-shaped display product is mainly used as an example for illustration, and the technical solution provided by the embodiment of the present invention may also be applied to special-shaped products with other shapes, such as products with polygonal corners, which is not limited herein.
In a first aspect, an embodiment of the present invention provides a backlight source, which may be applied in a display device. The backlight includes: a light emitting strip and a light guide plate. At least one side surface of the light guide plate is a light incident surface, and the light emitting strips are arranged on the light incident surface of the light guide plate to realize side light emitting. Of course, the backlight includes other structures besides the light-emitting bars and the light guide plate.
For example, as shown in fig. 1, the backlight 10 may include a reflective sheet 11, a light guide plate 12, an optical film group 13, a light emitting strip 14, a frame 15, and a light blocking tape 16; the light guide plate 12 covers the reflective sheet 11, the optical film set 13 covers the light guide plate 12, the light emitting strips 14 are disposed on one side surface or two opposite side surfaces of the light guide plate 12, the rubber frame 15 is disposed around the light guide plate 12, and the rubber frame 15 can be a low-light-transmission or non-light-transmission rubber frame 15, so as to prevent light leakage during the use of the backlight 10. The light emitted from the light-emitting strip 14 can be irradiated into the light guide plate 12, and the light-shielding tape 16 is attached to the edge of the rubber frame 15 and/or the optical module set to prevent the light leakage of the light-emitting strip 14. The Light bar 14 may be a Light-Emitting Diode (LED) string. Details of the backlight 10 can be found in the related art and will not be described in detail here.
It is understood that the shape and size of the light guide plate 12 in the backlight 10 should match the shape and size of the effective display area in the display device to correspondingly illuminate the entire display area. In the case of a display device having a profile such as rounded corners, the corresponding area of the light guide plate 12 is designed to have the same profile shape.
Further, the backlight 10 of the present embodiment is limited by the irregular frame of the device, and the width of the light-emitting strip 14 along the extending direction of the light-emitting strip 14 is smaller than the maximum width of the light guide plate 12. For example, fig. 2 shows a partial area of an exemplary round-corner display device as an illustration, and as shown in fig. 2, the light-emitting strip 14 is an LED light string, which is limited by a round-corner-shaped frame, the LED light string cannot be well adapted to the light-incident surface of the light guide plate 12, and the distance a between the light-emitting center of the edge LED light bead and the edge of the light guide plate 12 is large, for example, 8.42mm can be reached. This results in that the direct light range of the light emitting strips 14 does not completely cover the shaped area of the light guide plate 12, i.e. the shaped area has a non-direct area 122 beyond the direct light range of the light emitting strips 14.
Taking a special-shaped display product with round corners as an example, a light direct-irradiation simulation test is performed on the corresponding light guide plate 12, and the test result is shown in fig. 3. Note that fig. 3 only shows a lamp front region of the light guide plate 12 with respect to the non-direct region 122 as an illustration, and does not show the overall shape of the light guide plate 12. As can be seen from fig. 3, a part of the rounded corner region close to the edge cannot be directly illuminated by the light of the light emitting bar 14, i.e. the part is a non-direct region (e.g. the edge rounded corner region not covered by the light 140 in the oval dashed box in fig. 3). Under the condition, if the lattice points are arranged on the bottom surface of the traditional light guide plate, the dark area exists in the special-shaped area, and the brightness uniformity of the whole light emitting surface cannot be ensured.
Therefore, in the backlight 10 provided in this embodiment, the dot density of the first predetermined region 120 on the bottom surface 12A of the light guide plate is increased to adjust the light direction, so that the dot density of the first predetermined region 120 on the bottom surface 12A of the light guide plate is greater than the dot density of the reference region 121, as shown in fig. 4. The dot density is a ratio of all dot areas arranged in the first predetermined area 120. It should be noted that fig. 4 only shows the dot arrangement of a part of the area of the bottom surface 12A of the light guide plate near the light emitting bars, and other areas of the bottom surface 12A of the light guide plate are also provided with dots according to the conventional dot arrangement, which is not shown in fig. 4.
Specifically, the first preset region 120 (a region surrounded by the arc-shaped dotted line and the edge of the light guide plate 12 as illustrated in fig. 4) covers the non-direct region 122 of the light guide plate 12 (a diagonal filling region as illustrated in fig. 4). The specific range of the first predetermined area 120 may be determined in advance through a plurality of dark field test tests for the actual shape of the light guide plate 12. In an alternative embodiment, the range of the first predetermined area 120 is a range of a shadow area formed in the light guide plate due to the presence of the non-direct area 122 before the light guide plate is not modified according to the embodiment of the present invention. For example, the shadow area may be defined as an area of the light guide plate 12 with a brightness lower than a preset brightness threshold in a lighting state of the lighting strip 14, and the preset brightness threshold may be determined according to an average brightness of the light guide plate 12 in a practical application scene.
For example, assuming that the backlight 10 is a side-emitting backlight with a light-emitting bar 14 disposed on one side, as shown in fig. 4, two corners of the front area of the light guide plate 12 are rounded, and the two rounded areas have non-direct-light areas 122, at this time, the corresponding first preset areas 120 need to be determined for the shadow areas at the two rounded areas.
It should be noted that the reference region 121 is another region of the bottom surface 12A of the light guide plate, which has a vertical distance to the light-emitting bars 14 equal to the first predetermined region 120, that is, a region of the light guide plate designed to have a dot density equal to that of the first predetermined region 120. For example, the reference region 121 may be a remaining region except for the first preset region 120 in the front region of the lamp below the horizontal line dotted line in fig. 4. It can be understood that, in the conventional light guide plate design, the dots with different arrangement densities, such as different densities and sizes, are arranged along the direction perpendicular to the light-emitting bars 14 (the Y-axis direction shown in fig. 4), and the arrangement densities are the same for the areas with the same Y-coordinate, that is, the dot arrangement densities of the first preset area 120 and the reference area 121 are the same.
In the embodiment, compared with the reference area 121, the arrangement density of the first predetermined area 120 is increased, so that the light direction of the first predetermined area 120 can be effectively adjusted, and more light rays incident from the peripheral area into the first predetermined area 120 are emitted from the light emitting surface area corresponding to the first predetermined area 120 to compensate the brightness of the area, thereby being beneficial to improving the dark shadow formed in the non-direct area 122 of the light guide plate 12 by the limitation of the special-shaped structure, and improving the brightness uniformity of the light guide plate 12.
For example, in the light guide plate 12 structure shown in fig. 4, both bottom corners are rounded and shaped, and then, in the front lamp region where the first preset region 120 is located (as the region below the horizontal dotted line in fig. 4), the dot density of the light guide plate bottom surface 12A follows a trend from large → small → constant → increasing in the extending direction (X-axis direction) of the light emitting bars 14.
In an application scenario, the dot density of the reference region 121 is 89%, and then the dot density of the first preset region 120 is greater than 89%. It can be understood that, in an ideal case, assuming that the dots are all tightly connected, there still exist some gaps between adjacent dots, as shown in fig. 5, taking a circular dot as an example, for a dot formed by a dot collision process, taking a hexagonal area as a dot proportion unit, which can be used to calculate the dot proportion, where the dot proportion area is 90.6% of the area of the dot area filled in the triangle/the area of the hexagonal unit. That is, the maximum theoretical density of dots formed in the light guide plate 12 by the dot impact process is 90.6%.
Thus, in an alternative embodiment, as shown in fig. 4, the first preset area 120 is arranged with first dots 1201 and second dots 1202, the area of the second dots 1202 is smaller than that of the first dots 1201, and the second dots 1202 are arranged in the gap areas between adjacent first dots 1201. That is, the dot density of the bottom first predetermined area 120 is increased based on the conventional light guide plate by processing the dots with smaller sizes in the gap area.
The dot processing technology is not limited in this embodiment. For example, two mesh point processes with different processing precisions can be used to process the first mesh point 1201 and the second mesh point 1202 respectively. For example, a dot impact and laser mixed dot process may be adopted to form the first dots 1201 and the second dots 1202 in the first preset area 120, specifically, the first dots 1201 with uniform density may be processed in the whole front lamp area of the bottom surface 12A of the light guide plate by the dot impact dot process, and then the second dots 1202 may be processed in the gap area between adjacent first dots 1201 in the first preset area 120 by the laser dot process. At this time, the density of the first dots 1201 arranged in the first preset area 120 is equal to the density of the first dots 1201 arranged in the reference area 121. The overall dot density of the first preset area 120 may be up to 90.6%, for example, up to 91%, and may be specifically set according to actual needs.
In an alternative embodiment, on the basis of increasing the dot density of the first predetermined area 120 on the bottom surface, in order to better compensate the brightness of the shadow area, as shown in fig. 6, the second predetermined area 123 opposite to the first predetermined area 120 in the light emitting surface 12B of the light guide plate is further arranged with third dots 1230. The light routing is further adjusted by additionally arranging the dots in the corresponding area of the light-emitting surface 12B of the light guide plate, so that more light incident to the original shadow area is transmitted out through the dots on the light-emitting surface, and the brightness of the shadow area is further compensated. Fig. 6 only shows a part of the area of the light guide plate exit surface 12B close to the light-emitting bar, and the remaining area of the light guide plate exit surface 12B is not shown in fig. 6.
In an alternative embodiment, in order to optimize the brightness compensation effect and improve the uniformity of the overall brightness, the density of the third dots 1230 in the second predetermined area 123 may be set to be changed in a gradient manner, and the specific arrangement may be determined according to a plurality of experiments.
For example, the second predetermined region 123 may include a first sub-region 1231 (a region surrounded by the lower arc-shaped dashed line and the light exit surface edge as illustrated in fig. 6) and a second sub-region 1232 (a light exit surface region between the two arc-shaped dashed lines as illustrated in fig. 6) adjacent to the first sub-region 1231. The first sub-area 1231 is an area opposite to the first predetermined area 120, and also covers the non-direct area 122. For example, an orthographic projection of the first sub-area 1231 on the bottom surface 12A of the light guide plate coincides with the first preset area 120. The density of the third dots 1230 arranged in the second sub-area 1232 is less than the density of the third dots 1230 arranged in the first sub-area 1231, and the interval between adjacent dots in the second sub-area 1232 is positively correlated with the distance to the first sub-area 1231. That is, in the second sub-area 1232, the farther the position is from the first sub-area 1231, the larger the spacing distance between the adjacent dots, that is, the smaller the dot density, and conversely, the closer the position is to the first sub-area 1231, the smaller the spacing distance between the adjacent dots, that is, the larger the dot density.
For example, the dot density of the first sub-area 1231 may be set to 89%, and the dot density in the second sub-area 1232 may be decreased from 89% to 59% as the distance from the first sub-area 1231 increases.
By arranging the third dots 1230 in the first sub-area 1231, more light rays incident to the area can be uniformly transmitted through the third dots 1230; further, by providing dots of different densities in the second sub-area 1232, which is the peripheral area of the first sub-area 1231, a part of the light passing through the second sub-area 1232 can be reflected back to the shadow area, thereby increasing the light incident on the first sub-area 1231. Therefore, the two are combined to achieve the technical effect of further compensating the brightness of the shadow area.
In an alternative embodiment, the area of the second sub-region 1232 may be larger than the area of the first sub-region 1231. For example, the area of the second sub-region 1232 may be 1.5 to 3 times the area of the first sub-region 1231. Setting the area of the second sub-region 1232 within this range enables further optimization of the luminance compensation effect on the shadow region. It can be understood that the area of the second sub-region 1232 should not be too large, and should not be too small, and too large may affect the brightness of other regions, and too small can reflect back light with limited light, and the brightness compensation effect for the shadow region is not ideal.
In an alternative embodiment, the first dimension of the second predetermined area 123 is smaller than the second dimension, the first dimension is a width along the extending direction (X direction) of the light emitting bar 14, and the second dimension is a length along the perpendicular direction (Y direction) of the light emitting bar 14. It can be understood that the light incident on the light guide plate 12 is entirely transmitted toward the direction perpendicular to and away from the light-emitting strips 14, and gradually exits from the light-emitting surface in the process of transmission. Therefore, in order to reflect more light around the dark shadow area back to the dark shadow area, the second sub-area 1232 may be disposed above the first sub-area 1231 along the Y-axis direction, such that the width of the whole second preset area 123 is smaller than the length.
Taking the round corner display product as an example, that is, the edge of the light incident surface of the light guide plate 12 is in a round corner shape, then, the first size of the second predetermined area 123 should be larger than the radius of the round corner. Thus, the second predetermined area 123 can cover the whole fillet area, so as to ensure the brightness compensation effect on the whole fillet area.
For example, the fillet radius R is 8mm, the dimension of the second predetermined area 123 in the X direction is 10mm, and the dimension in the Y direction is 12 mm. The dimension in the X direction is 1.2 times of the radius of the fillet, and the dimension in the Y direction is 1.5 times of the radius of the fillet.
In order to verify the effect of the technical scheme provided by the embodiment of the present invention, taking a rounded corner display product as an example, the brightness uniformity of the same front area of the lamp is tested with respect to a conventional light guide plate (sample 1), a light guide plate (sample 2) with a dot density increased in the first preset area 120, and a light guide plate (sample 3) with dots added in the second preset area 123, respectively, and the positions of the test sampling points 700 are schematically shown in fig. 7. For example, as shown in fig. 7, 9 sets of equally spaced test sampling points 700 are provided in the X-axis direction, and each set of test sampling points includes 4 test sampling points 700 equally spaced in the Y-axis direction.
Specifically, in the front area of the lamp of sample 1, the dot density of the first predetermined area 120 is about 89% the same as that of the reference area 121, and the brightness distribution and uniformity results of each sample point are shown in table 1.
TABLE 1
In the front area of the lamp of sample 2, the dot density of the reference area 121 was about 89%, and the dot density of the first predetermined area 120 was about 91%, and the brightness distribution and uniformity results of each sample point are shown in table 2.
TABLE 2
In sample 3, on the basis of sample 2, dots are additionally arranged in the second preset area 123 on the light emitting surface, wherein the dot density of the first sub-area 1231 is between 89% and 90%, and the dot density of the second sub-area 1232 is between 89% and 59% in a gradient manner, and at this time, the brightness distribution and uniformity results of each sampling point are shown in table 3.
TABLE 3
In tables 1 to 3, the uniformity result is obtained by dividing the minimum value by the maximum value in the luminance sample point array, but other calculation methods may be adopted, and this embodiment is not limited thereto. As can be seen from comparing tables 1 to 3, by increasing the dot density of the first predetermined area 120 on the bottom surface 12A of the light guide plate and adding the dots in the second predetermined area 123 on the light emitting surface 12B of the light guide plate, the brightness compensation can be effectively performed on the dark area caused by the non-direct-illumination area in the conventional light guide plate, so that the overall brightness uniformity of the light guide plate in the front area is significantly improved.
Based on the same inventive concept, in another embodiment of the present invention, there is provided a display device, as shown in fig. 8, a display device 200 includes the backlight 10 described in any of the foregoing embodiments, and a liquid crystal panel 20 disposed in a stacked manner with respect to the backlight 10.
It should be noted that the display device 200 in this embodiment may be: the system comprises any product or component with a display function, such as a mobile phone, a vehicle-mounted central control system, electronic paper, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame or a navigator and the like.
Since the backlight 10 included in the display device 200 according to the embodiment of the present invention is described in the foregoing, the backlight 10 according to the embodiment of the present invention; the liquid crystal panel 20 may be any type of liquid crystal panel 20 in the prior art; therefore, the detailed structure and effect principle of the display device 200 can be understood by those skilled in the art, and therefore, the detailed description thereof is omitted here. Any display device 200 that includes the backlight 10 of the present embodiment is within the scope of the present invention.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A backlight, comprising: the light guide plate comprises light emitting strips and a light guide plate, wherein at least one side surface of the light guide plate is a light incident surface, the light emitting strips are arranged on the light incident surface of the light guide plate, and the width of the light emitting strips is smaller than that of the light guide plate along the extending direction of the light emitting strips;
the density of the dots distributed in a first preset area on the bottom surface of the light guide plate is greater than that of the dots in a reference area, wherein the first preset area covers a non-direct-radiation area of the light guide plate, the reference area is the other area in the bottom surface of the light guide plate, the vertical distance from the bottom surface of the light guide plate to the light-emitting strips is equal to that of the first preset area, the non-direct-radiation area exceeds the direct-radiation range of the light-emitting strips, and the density of the dots is the ratio of the area of the distributed dots in the area of the first preset area.
2. The backlight of claim 1, wherein the first predetermined area is arranged with a dot density greater than 89%.
3. The backlight of claim 1, wherein the first predetermined area is arranged with first dots and second dots, the second dots having an area smaller than the area of the first dots, the second dots being arranged in interstitial areas between adjacent first dots.
4. The backlight of claim 3, wherein the reference area is also populated with the first dots, and the first dot density of the first predetermined area is equal to the first dot density of the reference area.
5. The backlight of claim 3, wherein the first dots are formed by a dot impact dot process and the second dots are formed by a laser process.
6. The backlight as claimed in claim 1, wherein third dots are arranged in a second predetermined area of the light-emitting surface of the light guide plate opposite to the first predetermined area, wherein the light-emitting surface is opposite to the bottom surface of the light guide plate.
7. The backlight of claim 6, wherein the second predetermined area comprises a first sub-area and a second sub-area adjacent to the first sub-area, the first sub-area is an area opposite to the first predetermined area, the density of the third dots arranged in the second sub-area is less than the density of the third dots arranged in the first sub-area, and the spacing between adjacent dots in the second sub-area is positively correlated to the distance from the first sub-area.
8. The backlight of claim 7, wherein the second sub-region has an area 1.5 to 3 times the area of the first sub-region.
9. The backlight of claim 6, wherein the second predetermined area has a first dimension smaller than a second dimension, the first dimension being a width along the extension direction of the light-emitting bar, and the second dimension being a length along the perpendicular direction of the light-emitting bar.
10. A display device comprising the backlight according to any one of claims 1 to 9 and a liquid crystal display panel disposed to be stacked on the backlight.
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| CN115145076A (en) * | 2022-06-24 | 2022-10-04 | 黄山市展硕半导体科技有限公司 | Backlight source with unconventional LED placement mode |
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