CN114114520A - Light guide plate, optical assembly and display device - Google Patents
Light guide plate, optical assembly and display device Download PDFInfo
- Publication number
- CN114114520A CN114114520A CN202111372716.0A CN202111372716A CN114114520A CN 114114520 A CN114114520 A CN 114114520A CN 202111372716 A CN202111372716 A CN 202111372716A CN 114114520 A CN114114520 A CN 114114520A
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- point
- side edge
- guide plate
- light
- light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—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 characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
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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
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention provides a light guide plate, an optical assembly and a display device. The light guide plate comprises a first part and a second part, wherein the first part is provided with a first side edge, a second side edge and a first bottom edge, and the first bottom edge is connected with the first side edge and the second side edge; the second part is provided with a third side edge, a fourth side edge and a second bottom edge, and the second bottom edge is connected with the third side edge and the fourth side edge; the first side edge and the second side edge extend along a first direction; the first bottom edge and the second bottom edge extend along a second direction; any point on the third side edge has a first distance x from the second bottom edge along the first direction, and has a second distance w from the first side edge along the second direction; wherein the first pitch x and the second pitch w have a first functional relationship therebetween.
Description
Technical Field
The present invention relates to a light guide plate, an optical assembly and a display device, and more particularly, to a light guide plate, an optical assembly and a display device capable of improving display uniformity.
Background
With the development of technology, display devices are widely used in many electronic products, such as mobile phones, tablet computers, watches, and the like.
Common display devices include conventional liquid crystal display devices and reflective liquid crystal display devices (RLCDs). The conventional liquid crystal display device includes a display panel and a backlight module disposed below the display panel, wherein the backlight module is used for emitting light to the display panel and then penetrating through the display panel. Generally, a light guide plate used in a backlight module has a rectangular shape. When a conventional light guide plate is mounted on the reflective liquid crystal display device, light leakage from the side edges often occurs, and is particularly serious when the reflective liquid crystal display device is close to a light source. Meanwhile, due to the structural limitation of the reflective liquid crystal display device, the reflective liquid crystal display device does not include optical films such as a diffusion sheet and a prism sheet, and thus the light efficiency problems such as light leakage and the like cannot be solved by adding a film material or performing surface treatment.
Therefore, how to design the structure of the light guide plate and adjust the transmission path of the light in the light guide plate to solve the problem of side light leakage of the reflective liquid crystal display device is one of the problems to be solved.
Disclosure of Invention
Embodiments of the present invention provide a light guide plate, an optical assembly and a display device, which can adjust a transmission path of light in the light guide plate to make the brightness of any point on the side of the entire light guide plate less than a critical brightness threshold, so as to solve the problem of light leakage at the side of the display device using the light guide plate and improve the display uniformity.
The light guide plate comprises a first part, a second part and a third part, wherein the first part is provided with a first side edge, a second side edge and a first bottom edge; a second portion having a third side, a fourth side and a second bottom, the second bottom connecting the third side and the fourth side; the first side edge and the second side edge extend along a first direction; the first bottom edge and the second bottom edge extend along a second direction; any point on the third side edge has a first distance x from the second bottom edge along the first direction, and has a second distance w from the first side edge along the second direction; wherein the first distance x and the second distance w have a first functional relationship, the first functional relationship being:
In the above light guide plate, the third side and the fourth side are symmetrically disposed.
An optical assembly embodying the present invention includes a light guide plate as described above; and the light source is arranged on the second bottom edge of the light guide plate.
In the above optical assembly, E is a preset brightness threshold; defining any point on the third side edge as a first point, wherein the brightness value of the first point is L3 in a use state, and L3 is not more than E; the brightness value of the first point in the first direction is L1, the brightness value of the first point in the second direction is L2,
wherein L1 ═ Ax + B; l2 ═ Cw + D.
In the above optical assembly, the light source has n light emitting elements, where n is a positive integer and is defined as the 1 st light emitting element and the 2 nd light emitting element, respectively, and a distance between two adjacent light emitting elements is l; when the light emitting device is in use, the luminance value of the 1 st light emitting device transmitted to the first point in the first direction is L11, the luminance value of the 2 nd light emitting device transmitted to the first point in the first direction is L12.. the luminance value of the nth light emitting device transmitted to the first point in the first direction is L1 n; the luminance value in the second direction transmitted to the first point by the 1 st light emitting element is L21, the luminance value in the second direction transmitted to the first point by the 2 nd light emitting element is L22.. the luminance value in the second direction transmitted to the first point by the n-th light emitting element is L2n, and thus,
In the above optical assembly, in a use state, the 1 st light emitting device transmits a luminance value L11 ═ ax + b in the first direction to the first point, and transmits a luminance value L21 ═ cw + d in the second direction to the first point.
In the above optical assembly, the light emitting element is not disposed in a region between the second direction and the first side edge of the second bottom edge corresponding to the third side edge.
The display device of the invention comprises a display panel; and an optical assembly as described above; the light emitted by the light source is incident to the display panel through the light guide plate, and is reflected back to the light guide plate from the display panel and then is emitted from the light guide plate.
In the display device, the display device further includes a cover plate, and the optical assembly is located between the display panel and the cover plate.
In the above display device, the display device further has a light-shielding adhesive member, and the light-shielding adhesive member is used for adhering the light guide plate and the cover plate.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1 is a schematic structural diagram of a light guide plate according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of an optical assembly according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a display device according to an embodiment of the invention.
Wherein, the reference numbers:
100: light guide plate
101: the first part
1011: the first side edge
1012: second side edge
1013: first bottom edge
102: the second part
1021: third side edge
1022: the fourth side edge
1023: second bottom edge
200: optical assembly
201: light source
300: display device
301: display panel
302: cover plate
303: light-shielding adhesive member
P: dot
l: spacing between two adjacent light emitting elements
x: first interval
w: second pitch
Detailed Description
The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:
referring to fig. 1, fig. 1 is a schematic structural diagram of a light guide plate according to an embodiment of the invention. As shown in fig. 1, the light guide plate 100 of the present invention includes a first portion 101 and a second portion 102 connected to each other. The first portion 101 includes a first side 1011, a second side 1012, and a first bottom 1013, the first bottom 1013 connects the first side 1011 and the second side 1012, and the first side 1011 and the second side 1012 extend along a first direction F1 (e.g., a horizontal direction in the figure). The second portion 102 includes a third side edge 1021, a fourth side edge 1022, and a second bottom edge 1023, wherein the second bottom edge 1023 connects the third side edge 1021 and the fourth side edge 1022. The first portion 101 and the second portion 102 are connected together, and the first base 1013 and the second base 1023 extend along the second direction F2 (vertical direction in the figure) and are disposed opposite to each other. The width of the second portion 102 in the second direction F2 gradually increases in a direction away from the first portion 101. As shown in fig. 1, the width of the first base edge 1013 in the second direction F2 is smaller than the width of the second base edge 1023 in the second direction F2. In the present embodiment, the first direction F1 is perpendicular to the second direction F2.
In this embodiment, the first portion 101 is rectangular. Specifically, the first side 1011 has a first end and a second end opposite to each other, the second side 1012 has a third end and a fourth end opposite to each other, and two ends of the first bottom 1013 are respectively connected to the first end of the first side 1011 and the third end of the second side 1012. The first side 1011 and the second side 1012 are parallel to each other and perpendicular to the first bottom 1013, so that the first bottom 1013 forms a right angle with the first side 1011 and the second side 1012.
In the present embodiment, the second portion 102 is different in shape from the first portion 101. Specifically, the third side 1021 has a fifth end and a sixth end opposite to each other, the fourth side 1022 has a seventh end and an eighth end opposite to each other, and two ends of the second bottom edge 1023 are respectively connected to the fifth end of the third side 1021 and the seventh end of the fourth side 1022. The sixth end of the third side 1021 is connected to the second end of the first side 1011, and the eighth end of the fourth side 1022 is connected to the fourth end of the second side 1012. The included angle between the second base edge 1023 and the third 1021 and fourth 1022 side edges is acute.
A symmetrical shape. Further, the first side edge 1011 and the second side edge 1012 have the same length, so that the light guide plate 100 is symmetrically disposed with respect to a middle line between the first bottom edge 1013 and the second bottom edge 1023. In practice, the method is not limited to this.
As shown in fig. 1, P is any point (which may be defined as a first point) on the third side edge 1021 of the second portion 102 in the light guide plate 100, the P point has a first distance x from the second bottom edge 1023 along the first direction F1, and the P point has a second distance w from the first side edge 1011 along the second direction F2, where the second distance w is a portion of the third side edge 1021 where the P point is located relative to the first side edge 1011 such that the width of the light guide plate 100 is increased in the second direction F2. Wherein, the first distance x and the second distance w have a first functional relationship, and the first functional relationship is:
Referring to fig. 1 and 2, fig. 2 is a schematic structural diagram of an optical assembly according to an embodiment of the present invention. As shown in fig. 1 and fig. 2, the optical assembly 200 of the present invention includes the light guide plate 100 according to the embodiment shown in fig. 1 and a light source 201, wherein the light source 201 is disposed at a second bottom edge 1023 of the light guide plate 100, and the light source 201 may be a light strip (or a light bar) including a plurality of light emitting elements. The light emitting elements may be LEDs. In this embodiment, the length of the first portion 101 in the first direction F1 is less than half of the length of the light guide plate 100 in the first direction F1, which is not limited in practical applications.
In the use state, assuming that the brightness value of the point P is L3, in order to avoid the light leakage in the display region corresponding to the point P, the brightness value L3 of the point P should satisfy a certain condition, i.e., L3 is not greater than E, where E is a preset brightness threshold, which can be set according to the difference of the display device structure and the difference of the light source brightness, and usually obtained by actual measurement, for example, measuring the brightness value at the position where the light leakage phenomenon does not occur in the display device as the preset brightness threshold. When L3 is less than or equal to E, the problem of light leakage in the display area corresponding to the point P will not occur. When each point on the third side 1021 and the fourth side 1022 satisfies that the brightness value is less than or equal to the preset brightness threshold E, when the reflective display device 300 (as shown in fig. 3) of the light guide plate 100 is used, the problem of light leakage does not occur in the display area corresponding to the third side 1021 or the fourth side 1022 of the light guide plate 100, thereby improving the display uniformity and the display effect of the display device 300.
As shown in fig. 2, compared to the second portion 102 of the light guide plate 100, the first portion 101 is a portion far away from the light source 201, and when the light guide plate 100 is applied to the display device 300, the problem of light leakage does not occur in the display regions corresponding to the first side 1011, the second side 1012 and the first bottom 1013 of the first portion 101. The brightness value at the position on the first side 1011 closest to the third side 1021 is higher than the brightness values at other positions on the first side 1011, and the brightness value at this position can be taken as the preset brightness threshold, that is, the brightness value at the second end of the first side 1011 connected to the third side 1021 is taken as the preset brightness threshold.
In this embodiment, taking point P in fig. 1 as an example, the luminance value L3 can be decomposed into a luminance value L1 in the first direction F1, a luminance value L2 in the second direction F2, and L1, L2 and L3 satisfy the relationship therebetween
Wherein L1 ═ Ax + B; l2 ═ Cw + D, and L1 and L2 were substituted into
And L3 is less than or equal to E, the first functional relation can be obtained.
Since the light source 201 has a plurality of light emitting elements, light emitted from each light emitting element is projected to the point P, and the superposition of these lights forms a luminance value L3 at the point P.
Assume that the light source 201 has n light emitting elements, n being a positive integer. The n light emitting elements can be respectively defined as a 1 st light emitting element and a 2 nd light emitting element. In this embodiment, n light emitting elements on the light source 201 are defined as a 1 st light emitting element and a 2 nd light emitting element sequentially along the second direction F2, which is not limited in practical operation.
In the operating state, along the first direction F1, the luminance value transmitted by the 1 st light-emitting device to the point P is L11, the luminance value transmitted by the 2 nd light-emitting device to the point P is L12, and so on, the luminance value transmitted by the nth light-emitting device to the point P is L1 n; in the second direction F2, the luminance value delivered to the point P by the 1 st light-emitting element is L21, the luminance value delivered to the point P by the 2 nd light-emitting element is L22, and so on, the luminance value delivered to the point P by the n-th light-emitting element is L2n, and thus,
For the acquisition of a, b, c, d constants, the following method can be adopted: lighting the 1 st luminous element, measuring the brightness values of different positions on the 1 st luminous element and the point P, calculating a relation that the brightness value changes along with x, thereby calculating the brightness value L3 of the point P, and decomposing the brightness value of the point P into L11 along a first direction F1, wherein L11 is ax + b; the luminance value at the point P is decomposed into L21 in the second direction F2, where L21 ═ cw + d. Thus, the values of constants a, b, c, and d can be confirmed. In this embodiment, the lighting of the 1 st light emitting element is taken as an example, and the invention is not limited to this.
In this embodiment, the plurality of light emitting elements are uniformly disposed along the second bottom edge 1023. In practice, in order to obtain a better light leakage preventing effect for the region corresponding to the third side edge 1021 and the fourth side edge 1022, as shown in fig. 2, no light emitting element is disposed in the region between the second bottom edge 1023 corresponding to the third side edge 1021 and the first side edge 1011 along the second direction F2. Similarly, no light emitting element is disposed in an area between the second bottom edge 1023 corresponding to the fourth side edge 1022 and the second side edge 1012 in the second direction F2. That is, no light emitting element is disposed between the intersection of the first side edge 1011 extending along the first direction F1 and the second bottom edge 1023 to the end point corresponding to the second bottom edge 1023. The second side edge 1012 extends along the first direction F1 and is not provided with a light emitting element between the intersection point of the second bottom edge 1023 and the end point corresponding to the second bottom edge 1023.
Referring to fig. 1 to 3, fig. 3 is a schematic structural diagram of a display device according to an embodiment of the invention. As shown in fig. 1 to 3, a display device 300 of the present invention is a reflective display device, and includes a display panel 301, an optical assembly 200 according to the embodiment shown in fig. 2, and a cover plate 302. The display panel 301, the optical assembly 200 and the cover plate 302 are stacked, the optical assembly 200 is disposed between the display panel 301 and the cover plate 302, and the light guide plate 100 in the optical assembly 200 is bonded to the cover plate 302 by the light-shielding adhesive 303. Light emitted from the light source 201 in the optical assembly 200 is incident to the display panel 301 through the light guide plate 100, and is reflected from the display panel 301 back to the light guide plate 100 and then emitted from the light guide plate 100. In this embodiment, the light-shielding adhesive 303 is disposed between the light guide plate 100 and the cover plate 302 adjacent to the light source 201, so that the light leakage phenomenon in the display area corresponding to the light source 201 can be avoided while the cover plate 302 is fixed.
In summary, according to the embodiments of the invention, the shape of the light guide plate in the display device is changed, and the width of the light guide plate near one end of the light source is increased, so that the light guide plate is in an irregular shape, and thus, the transmission path of the light in the light guide plate is adjusted, and the brightness of any point on the side of the whole light guide plate is smaller than the critical brightness value, so that the display device using the light guide plate avoids the problem of side light leakage, and the display uniformity of the display device is improved.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A light guide plate, comprising:
the first part is provided with a first side edge, a second side edge and a first bottom edge, and the first bottom edge is connected with the first side edge and the second side edge;
a second portion having a third side, a fourth side and a second bottom, the second bottom connecting the third side and the fourth side;
the first side edge and the second side edge extend along a first direction; the first bottom edge and the second bottom edge extend along a second direction;
any point on the third side edge has a first distance x from the second bottom edge along the first direction, and has a second distance w from the first side edge along the second direction; wherein
The first distance x and the second distance w have a first functional relationship, and the first functional relationship is:
2. The light guide plate according to claim 1, wherein the third side edge and the fourth side edge are symmetrically disposed.
3. An optical assembly, comprising:
a light guide plate according to claim 1; and
and the light source is arranged at the second bottom edge of the light guide plate.
4. The optical assembly of claim 3, wherein E is a predetermined brightness threshold; defining any point on the third side edge as a first point, wherein the brightness value of the first point is L3 in a use state, and L3 is not more than E; the brightness value of the first point in the first direction is L1, the brightness value of the first point in the second direction is L2,
wherein L1 ═ Ax + B; l2 ═ Cw + D.
5. The optical assembly according to claim 4, wherein the light source has n light emitting elements, n is a positive integer and is defined as the 1 st light emitting element and the 2 nd light emitting element, respectively, and the distance between two adjacent light emitting elements is l; when the light emitting device is in use, the luminance value of the 1 st light emitting device transmitted to the first point in the first direction is L11, the luminance value of the 2 nd light emitting device transmitted to the first point in the first direction is L12.. the luminance value of the nth light emitting device transmitted to the first point in the first direction is L1 n; the luminance value in the second direction transmitted to the first point by the 1 st light emitting element is L21, the luminance value in the second direction transmitted to the first point by the 2 nd light emitting element is L22.. the luminance value in the second direction transmitted to the first point by the n-th light emitting element is L2n, and thus,
6. The optical assembly according to claim 5, wherein in a use state, the 1 st light-emitting element transmits a luminance value L11 ═ ax + b in the first direction to the first point and transmits a luminance value L21 ═ cw + d in the second direction to the first point.
7. The optical assembly according to claim 3, wherein the second bottom edge is not provided with the light emitting element corresponding to a region between the third side edge and the first side edge in the second direction.
8. A display device, comprising,
a display panel; and
an optical assembly according to any one of claims 3 to 7;
the light emitted by the light source is incident to the display panel through the light guide plate, and is reflected back to the light guide plate from the display panel and then is emitted from the light guide plate.
9. The display device according to claim 8, further comprising a cover plate, wherein the optical element is located between the display panel and the cover plate.
10. The display device according to claim 9, further comprising a light-shielding adhesive member for bonding the light guide plate and the cover plate.
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| CN202111372716.0A CN114114520A (en) | 2021-11-18 | 2021-11-18 | Light guide plate, optical assembly and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111372716.0A CN114114520A (en) | 2021-11-18 | 2021-11-18 | Light guide plate, optical assembly and display device |
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| CN114114520A true CN114114520A (en) | 2022-03-01 |
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