CN113050328B - Front module and display device - Google Patents
Front module and display device Download PDFInfo
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- CN113050328B CN113050328B CN202110274729.8A CN202110274729A CN113050328B CN 113050328 B CN113050328 B CN 113050328B CN 202110274729 A CN202110274729 A CN 202110274729A CN 113050328 B CN113050328 B CN 113050328B
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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
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention relates to a front module, which is positioned on one side of a reflective display screen and comprises a light source, a light guide plate and a functional structure layer; the light source is positioned at the light incident side of the light guide plate; the light guide plate comprises a light incident surface opposite to the light source and a bottom surface adjacent to the light incident surface; the functional structure layer is connected with the bottom surface of the light guide plate and comprises a plurality of microstructures, and light rays incident from the light incident surface are modulated by the microstructures and then are incident to the reflective display screen at a preset angle; the preset angle is less than 30 degrees. The invention also relates to a display device.
Description
Technical Field
The invention relates to the technical field of display product manufacturing, in particular to a front module and a display device.
Background
The RLCD (reflective display) cannot actively emit light, and mainly uses reflected ambient light to display a picture, so that the RLCD cannot normally display the picture under low ambient light illumination, and a front light source needs to be added in front of the RLCD to solve the problem. The RLCD is mainly characterized in that a metal reflecting layer is plated on an array substrate (an array substrate), the mirror reflection characteristic is obvious, and a common front light source irradiates the surface of the RLCD to cause the problems of low light source utilization efficiency, large visual angle glare and the like, so that normal display cannot be realized.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a front module and a display device, which solve the problems of low light utilization efficiency due to specular reflection.
In order to achieve the above purpose, the technical scheme adopted in the embodiment of the invention is as follows: a front module is positioned at the light incident side of a reflective display screen and comprises a light source, a light guide plate and a functional structure layer;
the light source is positioned at the light incident side of the light guide plate;
the light guide plate comprises a light incident surface opposite to the light source and a bottom surface adjacent to the light incident surface;
the functional structure layer is connected with the bottom surface of the light guide plate and comprises a plurality of microstructures, and light rays incident from the light incident surface are modulated by the microstructures and then are incident to the reflective display screen at a preset angle;
the preset angle is less than 30 degrees.
Optionally, the light source includes a plurality of LED lamps distributed along a first direction, and the microstructures are strip-shaped structures extending along the first direction.
Optionally, the functional structure layer includes a first surface connected to the bottom surface and a second surface opposite to the first surface, and the microstructure is a groove formed by recessing from the second surface toward a direction close to the first surface.
Optionally, a cross section of the microstructure in the second direction is a trapezoid, the trapezoid includes a first side close to the light guide plate and a second side opposite to the first side, a length of the first side is greater than a length of the second side, the second direction is perpendicular to the bottom surface of the light guide plate, and the second direction is perpendicular to the first direction.
Optionally, the microstructure includes a first side surface facing the light source, and an included angle between the first side surface and the first surface is 47 to 67 degrees.
Optionally, an included angle between the first side surface and the first surface is 57 degrees.
Optionally, the refractive index of the functional structure layer is greater than the refractive index of the reflective display screen.
Optionally, a first optical adhesive layer is disposed between the functional structure layer and the reflective display screen, the first optical adhesive layer includes a protrusion filled in the groove, a difference between a refractive index of the first optical adhesive layer and a refractive index of the reflective display screen is smaller than a first preset value, the refractive index of the first optical adhesive layer is smaller than the refractive index of the functional structure layer, and the first preset value is 0.05.
Optionally, the touch screen or the cover plate is further included, the touch screen or the cover plate is connected with the light guide plate through a second optical adhesive layer, the second optical adhesive layer is of a plane structure, the second optical adhesive layer is connected with the light guide plate in a surface pasting mode, and the second optical adhesive layer is connected with the touch screen or the cover plate in a surface pasting mode.
Optionally, the refractive index of the second optical adhesive layer is smaller than the refractive index of the functional structure layer, the refractive index of the touch screen or the cover plate is smaller than the refractive index of the functional structure layer, a difference between the refractive index of the second optical adhesive layer and the refractive index of the touch screen or the cover plate is smaller than a second preset value, a difference between the refractive index of the light guide plate and the refractive index of the second optical adhesive layer is smaller than a third preset value, the second preset value is 0.05, and the third preset value is 0.05.
The embodiment of the invention also provides a display device which comprises the front module.
The beneficial effects of the invention are: the arrangement of the micro structure enables light rays emitted by the light source to be incident to the reflective display screen at an angle smaller than 30 degrees, and the light effect is improved.
Drawings
FIG. 1 is a schematic diagram of a front-end module according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the relationship between the modulation angle of the microstructure and the utilization coefficient of the front light source;
FIG. 3 is a schematic diagram illustrating a relationship between an outgoing angle of a light source and an incident angle of the light source incident on a reflective display panel;
FIG. 4 is a schematic diagram showing the light distribution characteristics of an LED;
fig. 5 is a schematic view showing a state where a microstructure is formed.
Detailed Description
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, are within the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the embodiment provides a front module located at one side of a reflective display 8, and including a light source 1, a light guide plate 2, and a functional structure layer 3;
the light source 1 is positioned at the light incident side of the light guide plate 2;
the light guide plate 2 comprises a light incident surface opposite to the light source 1 and a bottom surface adjacent to the light incident surface;
the functional structure layer 3 is connected with the bottom surface of the light guide plate 2, the functional structure layer 3 comprises a plurality of microstructures 4, and light rays incident from the light incident surface are modulated by the microstructures 4 and then are incident to the reflective display screen 8 at a preset angle;
the preset angle is less than 30 degrees.
The arrangement of the microstructures 4 on the functional structure layer 3 enables the incident angle of light incident to the reflective display screen 8 to be smaller than 30 degrees, so that the light-emitting angle of the reflective display screen 8 is smaller than 30 degrees, the lighting effect of the front light source 1 is improved, and the problem of large-angle glare is solved.
In this embodiment, the light source 1 includes a plurality of LED lamps distributed along a first direction, and the microstructures 4 are strip-shaped structures extending along the first direction.
The micro-structure 4 is a strip-shaped structure extending along the first direction, so that all light rays emitted by the LEDs and the like can be incident on the micro-structure 4 and then are modulated by the micro-structure 4 to be incident on the reflective display screen 8 at an incident angle smaller than 30 degrees, and the light efficiency is improved.
It should be noted that, in the light emitting direction of the LED lamp, a certain distance is provided between the microstructure 4 close to the LED lamp and the LED, so that some of the light emitted by the LED lamp will bypass the microstructure 4 and directly enter the reflective display screen 8 after being guided out by the light guide plate 2, but will still enter the microstructure 4 and be modulated by the microstructure 4 after being reflected by the reflective layer of the reflective display screen 8, even if the light is directly emitted, most of the light will directly enter the microstructure 4 after passing through the light guide plate 2, and then enter the reflective display screen 8 at the preset angle after being modulated by the microstructure 4, for example, the light with the light emitting angle smaller than 100 degrees still achieves the effect of enhancing the light efficiency, thereby ensuring the display effect of the normal viewing angle and avoiding the problem of large-angle glare.
A plurality of the microstructures 4 may be spaced apart in a direction away from the light source 1.
In this embodiment, the microstructure 4 may be a complete strip-shaped structure in the first direction, or may be composed of a plurality of short strip-shaped structures arranged at intervals along the first direction, as long as the light emitted from the light source 1 can be received.
In this embodiment, the functional structure layer 3 includes a first surface connected to the bottom surface and a second surface opposite to the first surface, and the microstructure 4 is a groove formed by recessing from the second surface toward a direction close to the first surface.
The microstructures 4 may also be protruding structures disposed on the second surface.
In this embodiment, a cross section of the microstructure 4 in the second direction is a trapezoid, where the trapezoid includes a first side close to the light guide plate 2 and a second side opposite to the first side, a length of the first side is greater than a length of the second side, the second direction is perpendicular to the bottom surface of the light guide plate 2, and the second direction is perpendicular to the first direction.
In this embodiment, the trapezoid is an isosceles trapezoid, but not limited thereto.
The microstructure 4 modulates light mainly by that the microstructure 4 is close to the first side surface 41 of the light source 1, the light enters the first side surface 41 of the microstructure 4 and enters the reflective display screen 8 after being reflected by the first side surface 41, and the incident angle of the light entering the reflective display screen 8 can be effectively constrained within a small angle range by selecting a proper inclination angle, so that the utilization efficiency of the front light source 1 is greatly improved in consideration of the reflectivity characteristic of the RLCD.
In order to improve the utilization rate of the light, in this embodiment, the light is totally reflected at the first side surface 41 and then enters the reflective display 8. To achieve this, the refractive index of the functional structure layer 3 is greater than the refractive index of the reflective display screen 8.
In this embodiment, for example, a first optical adhesive layer 5 is disposed between the functional structure layer 3 and the reflective display screen 8, the first optical adhesive layer 5 includes a protrusion filled in the groove, a difference between a refractive index of the first optical adhesive layer 5 and a refractive index of the reflective display screen 8 is smaller than a first preset value, the refractive index of the first optical adhesive layer 5 is smaller than the refractive index of the functional structure layer 3, and the first preset value is 0.05.
The refractive index of the first optical adhesive layer 5 is the same as or similar to the refractive index of the reflective display screen 8, so that occurrence of total reflection is avoided, change of the light-emitting angle of light can be made as small as possible, even not changed, and control of the light-emitting angle of light is facilitated, preferably, the refractive index of the first optical adhesive layer 5 is the same as the refractive index of the reflective display screen 8, for example, 1.49.
In this embodiment, the microstructure 4 includes a first side surface 41 facing the light source 1, and an included angle between the first side surface 41 and the first surface is 47 to 67 degrees.
In this embodiment, the included angle between the first side surface 41 and the first surface is 57 degrees.
Fig. 2 is a schematic diagram showing a relationship between an angle between the first side surface 41 and the first surface and a utilization factor of the front light source 1, fig. 3 is a schematic diagram showing a relationship between a light emitting angle of the LED lamp and an incident angle of light incident on the reflective display 8, and fig. 4 is a schematic diagram showing a light emitting characteristic of the LED.
Referring to fig. 4, the light-emitting angle of the led lamp is 0, the corresponding energy is 1, the light-emitting angle of the led lamp is 50 degrees, and the corresponding energy is 0.61, i.e., the larger the light-emitting angle is, the smaller the energy is. With reference to fig. 2, when an included angle between the first side surface 41 and the first surface is 57 degrees, that is, Θ 5=57 °, obtained by simulating a normal line, the front light utilization coefficient may be calculated by combining the LED light emission distribution characteristic and the RLCD reflectivity characteristic, that is, the front light source 1 utilization coefficient is the maximum. At this time, the light rays incident to the first side surface 41 are reflected and totally reflected, and the light rays emitted from the LED lamp are constrained within 30 degrees and incident to the RLCD reflection layer, and referring to fig. 3, among the light rays emitted from the LED lamp, the light rays with the light-emitting angle smaller than 100 degrees are modulated by the microstructure 4, and then the incident angles incident to the reflective display screen 8 are all smaller than 30 degrees.
In this embodiment, the front module further includes a touch screen or a cover plate 7, the touch screen or the cover plate 7 is connected to the light guide plate 2 through a second optical adhesive layer 6, the second optical adhesive layer 6 is a planar structure, the second optical adhesive layer 6 is connected to the light guide plate 2 through a surface paste method, and the second optical adhesive layer 6 is connected to the touch screen or the cover plate 7 through a surface paste method.
The touch screen or the cover plate 7 is attached to the second optical adhesive layer 6 in a full-attaching mode, and the mechanical performance of the product is improved compared with the attaching mode of frame attaching.
In this embodiment, for example, the refractive index of the second optical adhesive layer 6 is smaller than the refractive index of the functional structure layer 3, the refractive index of the touch screen or the cover plate 7 is smaller than the refractive index of the functional structure layer 3, a difference between the refractive index of the second optical adhesive layer 6 and the refractive index of the touch screen or the cover plate 7 is smaller than a second preset value, a difference between the refractive index of the light guide plate 2 and the refractive index of the second optical adhesive layer 6 is smaller than a third preset value, the second preset value is 0.05, and the third preset value is 0.05.
In this embodiment, the refracting index of second optical cement layer 6 with the refracting index of light guide plate 2 is the same or similar, has avoided the emergence of total reflection, improves the light efficiency, and for the laminating mode that the frame was pasted, in this embodiment touch screen or apron 7 with do not have the air bed between the light guide plate 2, the emergence of effectual avoidance total reflection.
In the present embodiment, the refractive index of the second optical adhesive layer 6 is the same as the refractive index of the light guide plate 2, for example, 1.49.
As shown in fig. 1, light emitted from the light source 1 enters the light guide layer, and there are 3 main cases of light entering the light guide layer, the first is a b light transmitted upward (in a direction away from the light guide plate 2), the second is a c light transmitted downward (in a direction close to the functional structure layer 3) to the functional structure layer 3 without contacting the microstructure 4 and directly entering the reflective display screen 8, and the third is a light a transmitted downward to the functional structure layer 3 and transmitted to the reflective display screen 8 after being modulated by the microstructure 4.
The light ray a enters the microstructure 4, and when the first side surface 41 is totally reflected (the light ray enters the first optical adhesive layer 5 with a low refractive index from the functional structure layer 3 with a high refractive index), and the angle between the first side surface 41 and the first surface is a preset angle (for example, 47 to 67 degrees), the emergent light can be effectively constrained within a small angle range, and the reflectance characteristic of the RLCD (the angle of the light ray emitted from the first side surface 41 is constrained within the small angle range, and the angle of the light emitted from the reflective display screen 8 is controlled within the small angle range) is considered, so that the utilization efficiency of the front light source 1 is greatly improved.
The light b enters the touch screen or the cover plate 7 through the light guide plate 2 and the second optical adhesive layer 6, is totally reflected on one surface of the touch screen or the cover plate 7 far away from the light guide plate 2, and reenters the front module to be recycled. The light c enters the functional structure layer 3, but enters the reflective display screen 8 after bypassing the microstructure 4, and is recycled after being reflected by the reflective display screen 8.
In this embodiment, the light guide plate 2 may be made of optical materials such as PC, PMMA, glass, and the like, and in an implementation paradigm of this embodiment, the light guide plate 2 is made of Glass, and the refractive index is 1.49.
In this embodiment, in order to save cost and reduce the loss of energy due to reflection at the first side surface 41 of the microstructure 4, the first optical adhesive layer 5 and the second optical adhesive layer 6 are made of conventional materials with a refractive index of 1.49.
In this embodiment, the refractive index of the functional structure layer 3 is 1.7, but not limited thereto.
In this embodiment, the refractive index of the touch screen or the cover plate 7 is 1.52, but not limited thereto, and the refractive index of the touch screen or the cover plate 7 may also be the same as the refractive index of the second optical adhesive layer 6, for example, 1.49.
In this embodiment, the microstructure 4 is an inverted trapezoidal structure, and it is difficult to form and remove a film, in this embodiment, the microstructure 4 is formed by rolling a soft film, referring to fig. 5, and then the functional structure layer 3 formed with the microstructure 4 is attached to the light guide plate 2 by using a third optical adhesive layer, where a refractive index of the third optical adhesive layer is the same as a refractive index of the light guide plate 2 or a refractive index of the functional structure layer 3.
The embodiment of the invention also provides a display device which comprises the front module.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A front module is positioned at the light incident side of a reflective display screen and is characterized by comprising a light source, a light guide plate and a functional structure layer;
the light source is positioned at the light incident side of the light guide plate;
the light guide plate comprises a light incident surface opposite to the light source and a bottom surface adjacent to the light incident surface;
the functional structure layer is connected with the bottom surface of the light guide plate and comprises a plurality of microstructures, and light rays incident from the light incident surface are modulated by the microstructures and then are incident to the reflective display screen at a preset angle;
the preset angle is less than 30 degrees;
the light source comprises a plurality of LED lamps distributed along a first direction, and the micro-structure is a strip-shaped structure extending along the first direction;
the functional structure layer comprises a first surface connected with the bottom surface and a second surface arranged opposite to the first surface, and the microstructure is a groove formed by sinking from the second surface to the direction close to the first surface; the refractive index of the functional structure layer is larger than that of the light guide plate.
2. The front module of claim 1, wherein the microstructures have a trapezoidal cross-section in the second direction, the trapezoidal cross-section includes a first side adjacent to the light guide plate and a second side opposite to the first side, the first side has a length greater than a length of the second side, the second direction is perpendicular to the bottom surface of the light guide plate, and the second direction is perpendicular to the first direction.
3. The front module of claim 2, wherein the microstructure comprises a first side surface facing the light source, and an included angle between the first side surface and the first surface is 47-67 degrees.
4. The front module of claim 3, wherein the first side surface is at an angle of 57 degrees to the first face.
5. The front module of claim 1, wherein the refractive index of the functional structure layer is greater than the refractive index of the reflective display screen.
6. The front module of claim 1, wherein a first optical adhesive layer is disposed between the functional structure layer and the reflective display screen, the first optical adhesive layer includes a protrusion filled in the groove, a difference between a refractive index of the first optical adhesive layer and a refractive index of the reflective display screen is smaller than a first predetermined value, the refractive index of the first optical adhesive layer is smaller than the refractive index of the functional structure layer, and the first predetermined value is 0.05.
7. The front module of claim 1, further comprising a touch screen or a cover plate, wherein the touch screen or the cover plate is connected to the light guide plate through a second optical adhesive layer, the second optical adhesive layer is of a planar structure, the second optical adhesive layer is connected to the light guide plate in a surface-mount manner, and the second optical adhesive layer is connected to the touch screen or the cover plate in a surface-mount manner.
8. The front module of claim 7, wherein a refractive index of the second optical adhesive layer is smaller than a refractive index of the functional structure layer, a refractive index of the touch screen or the cover plate is smaller than a refractive index of the functional structure layer, a difference between the refractive index of the second optical adhesive layer and the refractive index of the touch screen or the cover plate is smaller than a second preset value, a difference between the refractive index of the light guide plate and the refractive index of the second optical adhesive layer is smaller than a third preset value, the second preset value is 0.05, and the third preset value is 0.05.
9. A display device comprising the front module of any one of claims 1-8.
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| CN202110274729.8A CN113050328B (en) | 2021-03-15 | 2021-03-15 | Front module and display device |
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| CN202110274729.8A CN113050328B (en) | 2021-03-15 | 2021-03-15 | Front module and display device |
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| CN117826309A (en) * | 2022-09-27 | 2024-04-05 | 京东方科技集团股份有限公司 | Front light source module and display device |
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