CN111308727A - Display device - Google Patents

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Publication number
CN111308727A
CN111308727A CN201811519910.5A CN201811519910A CN111308727A CN 111308727 A CN111308727 A CN 111308727A CN 201811519910 A CN201811519910 A CN 201811519910A CN 111308727 A CN111308727 A CN 111308727A
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China
Prior art keywords
imaging
light
satisfied
normal
display device
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CN201811519910.5A
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Chinese (zh)
Inventor
吴世彬
刘裕升
陈纪暐
蔡明宪
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Quantum Optoelectronics Inc
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Quantum Optoelectronics Inc
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Priority to CN201811519910.5A priority Critical patent/CN111308727A/en
Publication of CN111308727A publication Critical patent/CN111308727A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
    • 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
    • G02F1/133606—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
    • G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
    • 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
    • G02F1/133616—Front illuminating devices

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention provides a display device, which comprises an imaging element, a planar surface light source and a polarized light separation element, wherein the planar surface light source is used for providing a plurality of illuminating light beams, the normal of the planar surface light source and the normal of the imaging element have a non-vertical configuration relation, the polarized light separation element is arranged between the planar surface light source and the imaging element and has a geometric cylindrical surface, the illuminating light beams from the planar surface light source are projected onto the polarized light separation element and are reflected, the illuminating light beams advance towards the imaging element, and the imaging light beams from the imaging element pass through the polarized light separation element to enable images to be presented outwards. The invention can make the illumination beam uniformly irradiate on the imaging surface of the imaging element within a certain visual angle, and the element is easy to manufacture and has low cost.

Description

Display device
Technical Field
The invention relates to the field of optics, in particular to a display device.
Background
With the advent of the Multimedia information (Multimedia) and network (Internet) era, the communication between images and information is becoming faster and various new display technologies are in force. With the development of these display technologies, various display technologies have been proposed to solve different problems encountered in various display applications.
Among them, the reflective lcd has the advantages of low power consumption and visibility under sunlight, and has become one of the mainstream developments in display technology, and the illumination system for providing illumination beam to the reflective lcd plays an important role in the image formation and display quality of the reflective lcd, so US patents in publication nos. US6433935, US6976759 and US7529029 are all discussed for the illumination system applied to the reflective lcd.
Please refer to fig. 1, which is a schematic diagram of a lighting system provided in U.S. patent publication No. US 6433935. The illumination light beam provided by the light source 11 is incident into the wedge prism 12 and is totally reflected therein to enlarge the area and the viewing angle of the illumination light beam on the reflective liquid crystal display 13, as disclosed in the specification, and will not be described herein again. However, the above illumination method causes chromatic aberration on the image exit surface 14 and causes optical axis skew and image distortion, which is not suitable for the application of subsequent imaging.
Please refer to fig. 2, which is a schematic diagram of a polarization separation module (pbsassemble) provided in U.S. patent publication No. US 6976759. The illumination beam 21 provided by the light source enters the prism 20, then is projected to the prism surface 22 and totally reflected to travel toward the polarization separation surface 23, and the illumination beam 21 projected to the polarization separation surface 23 is reflected from the polarization separation surface 23 to return to the prism surface 22 originally totally reflected and penetrate through the prism surface 22, and further irradiate on the imaging surface of the reflective light valve 27, and finally, the illumination beam 21 irradiated on the imaging surface of the reflective light valve 27 is converted into an imaging beam 26, and the imaging beam 26 sequentially passes through the prism surface 22, the polarization separation surface 23 and the compensation prism 24 and then is output. However, although the arrangement of the compensating prism 24 increases the thickness of the whole assembly, the distance between the imaging surface of the reflective optical valve 27 and the light exit surface 25 is increased, which is not favorable for miniaturization and matching with a short-focus optical system.
Please refer to fig. 3, which is a schematic diagram of an image display system provided in U.S. Pat. No. US 7529029. The polarization splitting prism 32 of the image display system 30 is designed with a curved surface 34 and a curved surface 35, which can be used to guide the optical path of the illumination light beam 36 from the light source 31 to the reflective light valve 33, and also can be used to guide the optical path of the imaging light beam 36' from the reflective light valve 33 to the outside, therefore, it is a design combining the illumination device and the imaging device. However, the combination of the illumination device and the imaging device requires the fabrication of a curved prism with a complex surface shape, the curved prism also requires a high surface precision, and the allowable assembly tolerance is controlled within a certain range to ensure the overall imaging quality.
As is apparent from the above description, the conventional display device has room for improvement.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a display device that can uniformly irradiate an illumination beam onto an imaging surface of an imaging element within a certain viewing angle, and that is easy to manufacture and low in cost.
The invention solves the technical problem and adopts the technical scheme that a display device is provided, which comprises an imaging element, a planar surface light source and a polarized light separation element, wherein the imaging element is provided with an imaging surface for providing an image; the planar surface light source is provided with a light-emitting surface for providing a plurality of illuminating light beams, and a normal of the light-emitting surface and a normal of the imaging surface are in a non-vertical configuration relation; the polarized light separation element is arranged between the planar surface light source and the imaging element and is provided with a geometric cylindrical surface, and the geometric cylindrical surface is used for projecting at least part of the illuminating light beam which comes from the planar surface light source and belongs to a first polarization onto the geometric cylindrical surface and generating reflection so as to enable at least part of the illuminating light beam which belongs to the first polarization to advance towards the imaging element; the geometric cylindrical surface is used for allowing at least part of the imaging light beam from the imaging element and belonging to the second polarization to pass through so as to enable the image to be presented outwards.
Preferably, when the half length of one side of the image plane is less than 2.75 millimeters (mm), the display device satisfies the following relation:
-0.047385Xi 2+0.771625Xi+3.4≤Yi；
Yi≤-0.047385Xi 2+0.771625Xi+5；
Yi＝Mi-Ni(ii) a And
69°≤θt≤78°；
wherein, XiIs a position on the imaging surface defined according to a coordinate axis parallel to the side of the imaging surface and perpendicular to the normal of the imaging surface, and MiA separation distance, N, for the position on the imaging plane extending up to the geometric cylinder along the normal of the imaging planeiA spacing distance, θ, extending from the position on the imaging surface to an upper surface of the imaging element along the normal of the imaging surfacetIs an angle between the normal of the imaging plane and the normal of the light-emitting surface.
Preferably, the display device further satisfies one of the following relations (a1) to (a 6):
(a1) when X is presentiWhen 0 is satisfied, Y is not less than 3.6i<3.8；
(a2) When X is presentiWhen 0 is satisfied, Y is not less than 3.8i<4.0；
(a3) When X is presentiWhen 0 is satisfied, 4.0 is not more than Yi<4.2；
(a4) When X is presentiWhen 0 is satisfied, 4.2 is not more than Yi<4.4；
(a5) When X is presentiWhen 0 is satisfied, 4.4. ltoreq. Yi<4.6; and
(a6) when X is presentiWhen 0 is satisfied, Y is not less than 4.6i<4.8。
Preferably, when the half length of one side of the image plane is greater than 2.75 millimeters (mm) and less than 3.5 mm, the display device satisfies the following relation:
-0.043299Xi 2+0.745345Xi+4≤Yi；
Yi≤-0.043299Xi2+0.745345Xi+6；
Yi＝Mi-Ni(ii) a And
68.5°≤θt≤82.5°；
wherein, XiIs a position on the imaging surface defined according to a coordinate axis parallel to the side of the imaging surface and perpendicular to the normal of the imaging surface, and MiA separation distance, N, for the position on the imaging plane extending up to the geometric cylinder along the normal of the imaging planeiA spacing distance, θ, extending from the position on the imaging surface to an upper surface of the imaging element along the normal of the imaging surfacetIs an angle between the normal of the imaging plane and the normal of the light-emitting surface.
Preferably, the display device further satisfies one of the following relations (b1) to (b 8):
(b1) when X is presentiWhen 0 is satisfied, 4.2 is not more than Yi<4.4；
(b2) When X is presentiWhen 0 is satisfied, 4.4. ltoreq. Yi<4.6；
(b3) When X is presentiWhen 0 is satisfied, Y is not less than 4.6i<4.8；
(b4) When X is presentiWhen 0 is satisfied, Y is not less than 4.8i<5.0；
(b5) When X is presentiWhen 0 is satisfied, Y is not less than 5.0i<5.2；
(b6) When X is presentiWhen 0 is satisfied, Y is not less than 5.2i<5.4；
(b7) When X is presentiWhen 0 is satisfied, Y is not less than 5.4i<5.6; and
(b8) when X is presentiWhen 0 is satisfied, Y is not less than 5.6i<5.8。
Preferably, the imaging element comprises a top cover glass, an intermediate layer and a circuit board, and the intermediate layer is located between the top cover glass and the circuit board; the imaging surface is located in the middle layer, and the upper surface of the imaging element is the upper surface of the upper cover glass.
Preferably, the imaging surface has a position defined according to a coordinate axis, and the coordinate axis is parallel to a side of the imaging surface and perpendicular to the normal of the imaging surface; wherein, a distance between the position on the imaging plane and the geometric cylinder along the normal of the imaging plane is larger as the position on the imaging plane moves to an axial direction of the coordinate axis.
Preferably, the imaging plane is rectangular, and the side of the imaging plane is a short side of the imaging plane.
Preferably, the planar light source comprises a substrate, a plurality of light emitting diodes and a diffuser, wherein the plurality of light emitting diodes are disposed on the substrate and provide a plurality of light beams, and the plurality of light beams form a planar light source after passing through the diffuser.
Preferably, the planar surface light source includes a light chamber, at least one LED and a diffuser, and the at least one LED and the diffuser are respectively located at two ends of the light chamber; the light-emitting diode is used for providing a plurality of light beams, and the light beams travel in the light chamber to be projected and diffusely reflected to the diffusion sheet and form a surface light source after passing through the diffusion sheet.
Preferably, the planar light source includes at least one light emitting diode and a light guide plate, the at least one light emitting diode is used for providing a plurality of light beams, and the light guide plate is used for projecting the light beams therein and guiding the light beams to travel, so that the light beams form a planar light source after passing through the light guide plate.
Preferably, the planar light source further includes a polarizer for passing the plurality of light beams therethrough and outputting the plurality of illumination light beams with the first polarization.
Preferably, the imaging element is a single crystal silicon reflective liquid crystal on silicon (LCoS) element.
Preferably, the polarization separation element is a reflective polarizer or a reflective polarizing Brightness Enhancement Film (DBEF).
Preferably, the polarization separation element is in the form of a film.
The invention also provides a display device, which comprises an imaging element, a planar surface light source and a polarized light separation element, wherein the imaging element is provided with an imaging surface for providing an image; the planar surface light source is used for providing a plurality of illuminating light beams; the polarized light separating element is arranged between the planar surface light source and the imaging element and is used for projecting and reflecting at least part of the illuminating light beam which comes from the planar surface light source and belongs to a first polarization on the planar surface light source so as to enable at least part of the illuminating light beam which belongs to the first polarization to advance towards the imaging element and enable at least part of the imaging light beam which comes from the imaging element and belongs to a second polarization to pass through the imaging element so as to enable the image to be presented outwards; the position on the imaging surface is defined according to a coordinate axis, the coordinate axis is parallel to a side of the imaging surface and perpendicular to a normal of the imaging surface, and a distance between the position on the imaging surface and the polarization separation element extending upward along the normal of the imaging surface is larger when the position on the imaging surface moves toward an axial direction of the coordinate axis.
Preferably, the planar surface light source has a light emitting surface, and a normal of the light emitting surface and the normal of the imaging surface are in a non-perpendicular configuration.
Preferably, when the half length of the side edge of the imaging plane is less than 2.75 millimeters (mm), the display device satisfies the following relation:
-0.047385Xi2+0.771625Xi+3.4≤Yi；
Yi≤-0.047385Xi2+0.771625Xi+5；
Yi＝Mi-Ni(ii) a And
69°≤θt≤78°；
wherein, XiThe bit defined according to the coordinate axis on the imaging planeTo put and MiThe position on the imaging plane extends up to the separation distance of the polarization separation element along the normal of the imaging plane, NiA spacing distance, θ, extending from the position on the imaging surface to an upper surface of the imaging element along the normal of the imaging surfacetIs an angle between the normal of the imaging plane and the normal of the light-emitting surface.
Preferably, the display device further satisfies one of the following relations (a1) to (a 6):
(a1) when X is presentiWhen 0 is satisfied, Y is not less than 3.6i<3.8；
(a2) When X is presentiWhen 0 is satisfied, Y is not less than 3.8i<4.0；
(a3) When X is presentiWhen 0 is satisfied, 4.0 is not more than Yi<4.2；
(a4) When X is presentiWhen 0 is satisfied, 4.2 is not more than Yi<4.4；
(a5) When X is presentiWhen 0 is satisfied, 4.4. ltoreq. Yi<4.6; and
(a6) when X is presentiWhen 0 is satisfied, Y is not less than 4.6i<4.8。
Preferably, when the half length of the side edge of the image plane is greater than 2.75 millimeters (mm) and less than 3.5 mm, the display device satisfies the following relation:
-0.043299Xi2+0.745345Xi+4≤Yi；
Yi≤-0.043299Xi2+0.745345Xi+6；
Yi＝Mi-Ni(ii) a And
68.5°≤θt≤82.5°；
wherein, XiM is the position on the imaging plane defined according to the coordinate axisiThe position on the imaging plane extends up to the separation distance of the polarization separation element along the normal of the imaging plane, NiA spacing distance, θ, extending from the position on the imaging surface to an upper surface of the imaging element along the normal of the imaging surfacetThe normal line of the imaging plane and the light emissionAn angle between the normal lines of the surfaces.
Preferably, the display device further satisfies one of the following relations (b1) to (b 8):
(b1) when X is presentiWhen 0 is satisfied, 4.2 is not more than Yi<4.4；
(b2) When X is presentiWhen 0 is satisfied, 4.4. ltoreq. Yi<4.6；
(b3) When X is presentiWhen 0 is satisfied, Y is not less than 4.6i<4.8；
(b4) When X is presentiWhen 0 is satisfied, Y is not less than 4.8i<5.0；
(b5) When X is presentiWhen 0 is satisfied, Y is not less than 5.0i<5.2；
(b6) When X is presentiWhen 0 is satisfied, Y is not less than 5.2i<5.4；
(b7) When X is presentiWhen 0 is satisfied, Y is not less than 5.4i<5.6; and
(b8) when X is presentiWhen 0 is satisfied, Y is not less than 5.6i<5.8。
Preferably, the imaging element comprises a top cover glass, an intermediate layer and a circuit board, and the intermediate layer is located between the top cover glass and the circuit board; the imaging surface is located in the middle layer, and the upper surface of the imaging element is the upper surface of the upper cover glass.
Preferably, the planar light source comprises a substrate, a plurality of light emitting diodes and a diffuser, wherein the plurality of light emitting diodes are disposed on the substrate and provide a plurality of light beams, and the plurality of light beams form a planar light source after passing through the diffuser.
Preferably, the planar surface light source includes a light chamber, at least one LED and a diffuser, and the at least one LED and the diffuser are respectively located at two ends of the light chamber; the light-emitting diode is used for providing a plurality of light beams, and the light beams travel in the light chamber to be projected and diffusely reflected to the diffusion sheet and form a surface light source after passing through the diffusion sheet.
Preferably, the planar light source includes at least one LED and a light guide plate, and the at least one LED is used to provide a plurality of light beams, and the plurality of light beams form a planar light source after passing through the light guide plate.
Preferably, the planar light source further includes a polarizer for passing the plurality of light beams therethrough and outputting the plurality of illumination light beams with the first polarization.
Preferably, the imaging plane is rectangular, and the side of the imaging plane is a short side of the imaging plane.
Preferably, the imaging element is a single crystal silicon reflective liquid crystal on silicon (LCoS) element.
Preferably, the polarization separation element is a reflective polarizer or a reflective polarizing Brightness Enhancement Film (DBEF).
Preferably, the polarization separation element is in the form of a film.
The polarized light separating element of the display device is provided with the geometric cylindrical surface, the geometric cylindrical surface of the polarized light separating element and the upper cover glass of the imaging element have specific distance distribution and are matched with the specific inclination angle of the planar surface light source, so that the illumination light beams provided by the planar surface light source can be uniformly irradiated on the imaging surface of the imaging element within a specific visual angle, the distance between the imaging surface of the imaging element and the polarized light separating element can be shortened, and the overall thickness and the volume of the display device are reduced. In addition, the polarized light separating element of the display device does not need to be manufactured by injection molding or grinding of a precise optical element, and does not need to be matched with the precise optical element, so the display device has the advantages of simple element manufacturing and low cost.
Drawings
FIG. 1: a schematic view of a lighting system is provided in US patent publication No. US 6433935.
FIG. 2: a schematic diagram of a polarization separation assembly (PBS assembly) is provided in U.S. patent publication No. US 6976759.
FIG. 3: a schematic diagram of an image display system provided in U.S. patent publication No. US 7529029.
FIG. 4: a schematic structural concept of the display device according to a preferred embodiment of the present invention is shown.
FIG. 5: is a conceptual diagram of the imaging element of the display device shown in FIG. 4 and the viewing angles of several pixels on the imaging surface thereof.
FIG. 6: a schematic diagram of the optical path of the display device shown in fig. 4 is shown.
FIG. 7: a conceptual diagram of a planar light source as a first embodiment applied to a display device shown in fig. 4 is shown.
FIG. 8: a perspective conceptual view of a partial structure of the planar surface light source shown in fig. 7.
FIG. 9: a conceptual diagram of a planar light source as a second embodiment applied to a display device shown in fig. 4.
FIG. 10: a conceptual diagram of a planar light source as a third embodiment applied to a display device shown in fig. 4.
FIG. 11: a schematic diagram of the display device shown in fig. 4 is a geometric concept marked by a coordinate system.
FIG. 12: a conceptual diagram of the distribution of the plurality of positions on the image plane for calculating the uniformity of the illumination is shown in fig. 4.
Detailed Description
Referring to fig. 4 to 6, fig. 4 is a conceptual diagram of a structure of a display device according to a preferred embodiment of the invention, fig. 5 is a conceptual diagram of an imaging element of the display device shown in fig. 4 and a view angle of a plurality of pixels on an imaging surface thereof, and fig. 6 is a schematic diagram of a light path of the display device shown in fig. 4. The display device 4 includes an imaging element 41, a planar surface light source 42 and a polarization separation element 43, wherein the imaging element 41 has an image forming surface 414 for providing an image, and the planar surface light source 42 has a light emitting surface 421 for providing a plurality of illuminating light beams L1, wherein a normal of the light emitting surface 421 of the planar surface light source 42 and a normal of the image forming surface 414 of the imaging element 41 are in a non-perpendicular arrangement relationship.
Furthermore, the polarized light separating element 43 is disposed between the planar surface light source 42 and the image forming element 41 and has a geometric cylindrical surface 431, and the geometric cylindrical surface 431 is used for the illumination light beam L1 with the first polarization from the planar surface light source 42 to be projected thereon and reflected, so that the illumination light beam L1 with the first polarization travels toward the image forming element 41 and belongs toThe illumination light beam L1 with the first polarization is projected onto the imaging surface 414 of the imaging element 41 and then reflected to form an imaging light beam, the imaging light beam exits the imaging element 41 and is converted into an imaging light beam L2 with the second polarization, and the imaging light beam L2 with the second polarization travels toward the polarization separation element 43 and passes through the geometric cylinder 431 of the polarization separation element 43 and then is output outward, so that the image is presented outward. Wherein the illumination light beam L1 with the first polarization has an incident angle θ when being projected to any pixel of the imaging surface 414 of the imaging element 41iAnd the illumination light beam L1 with the first polarization is reflected by the imaging surface 414 of the imaging element 41 and exits the imaging element 41 to form an imaging light beam L2 with the second polarization and having an incident angle θiEqual reflection angle thetarTherefore, the viewing angle θ of any one pixelVAngle of incidence θ to which illumination beam L1 may be incidentiRather, it is as shown in fig. 5.
In the preferred embodiment, the imaging element 41 is a single crystal silicon liquid crystal (LCoS) element, and includes a top cover glass 411, a circuit board 413, and an intermediate layer 412 located between the top cover glass 411 and the circuit board 413, and the intermediate layer 412 includes an electrode layer, a liquid crystal layer, an alignment layer, a reflective layer, a silicon crystal layer, and the like, which are known to those skilled in the art and will not be described herein again, and the image plane 414 is located in the intermediate layer 412 and has a rectangular shape. In the preferred embodiment, the polarization separation element 43 is in the form of a Film, and a reflective polarizer (reflective polarizer) or a reflective polarizing Brightness Enhancement Film (DBEF) can be used, and the geometric cylinder 431 thereof is a curved surface having a curvature only in one axis.
Three embodiments of the planar surface light source 42 are described below. Referring to fig. 7 and 8, fig. 7 is a conceptual diagram of a first embodiment of a planar light source applied to the display device shown in fig. 4, and fig. 8 is a schematic perspective diagram of a partial structure of the planar light source shown in fig. 7. The planar surface light source 42A of the first embodiment includes a substrate 422, a plurality of light emitting diodes 423A, a diffusion sheet 424A and a polarizer 425A, wherein the light emitting diodes 423A are disposed on the substrate 422 in a two-dimensional array, and a plurality of light beams L provided by the light emitting diodes 423A are scattered when projected to the diffusion sheet 424A, so that the light beams L can form a uniform surface light source after passing through the diffusion sheet 424A, and finally, the light beams L form a plurality of illumination light beams L1 with a first polarization after passing through the polarizer 425A; the polarizer 425A is disposed to prevent a portion of the light beam L passing through the diffusion sheet 424A from directly penetrating the polarization separation element 43, thereby reducing stray light and improving contrast and display effect of the display device 4, but the polarizer 425A is not an essential implementation element of the planar surface light source 42A.
Please refer to fig. 9, which is a conceptual diagram illustrating a planar light source of a second embodiment applied to the display device shown in fig. 4. The planar light source 42B of the second embodiment comprises a light chamber 426, at least one led 423B, a diffuser 424B and a polarizer 425B, wherein the led 423B is located at one end of the light chamber 426, and the diffuser 424B and the polarizer 425B are located at the other end of the light chamber 426, wherein a plurality of light beams L provided by the at least one led 423B travel in the light chamber 426, and are reflected and diffusely reflected on an inner surface layer 4261 of the light chamber 426 for multiple times to be projected onto the diffuser 424B, and the light beams L are scattered in the diffuser 424B, so that the light beams can form a uniform planar light source after passing through the diffuser, and finally, the light beams L form a plurality of illumination light beams L1 with a first polarization after passing through the polarizer 425B; the polarizer 425B is disposed to prevent a portion of the light beam L passing through the diffusion sheet 424B from directly penetrating the polarization separation element 43, thereby reducing stray light and improving contrast and display effect of the display device 4, but the polarizer 425B is not an essential implementation element of the planar surface light source 42B.
Please refer to fig. 10, which is a conceptual diagram of a planar light source of a third embodiment applied to the display device shown in fig. 4. The planar light source 42C of the third embodiment includes at least one light emitting diode 423C, a light guide plate 427 and a polarizer 425C, and the light beams L provided by the light emitting diode 423C are guided by the light guide plate 427 to be totally reflected and scattered for multiple times when being projected into the light guide plate 427, so that the light beams L can form a uniform planar light source after passing through the light guide plate 427, and finally, the light beams L form a plurality of illumination light beams L1 with the first polarization after passing through the polarizer 425C; the polarizer 425C is disposed to prevent a portion of the light beam L emitted from the light guide plate 427 from directly penetrating the polarization separation element 43, so as to improve the contrast and display effect of the display device 4, but the polarizer 425C is not a necessary implementation element of the planar surface light source 42C.
It should be understood that the above embodiments are only examples, and the implementation of the imaging device and the implementation of the imaging plane, the implementation of the polarization separation device and the implementation of the geometric cylindrical surface, and the implementation of the planar surface light source are not limited to the above embodiments, and those skilled in the art can make any equivalent design changes according to the actual application requirements.
In particular, the present invention designs that the geometric cylinder 431 of the polarization separation element 43 has a specific distance distribution with the top cover glass 411 of the imaging element 41, and matches a specific inclination angle of the planar surface light source 42, so that the illumination light beam L1 provided by the planar surface light source 42 can be at a specific viewing angle θVInternally uniformly irradiates on the imaging plane 414 of the imaging element 41. In one embodiment, the display device further includes a transparent carrier (not shown) having an optical curved surface corresponding to the geometric cylinder 431 of the polarization separation element 43 for disposing the polarization separation element 43 thereon; wherein, the transparent carrier can be formed by grinding glass or plastic, but not limited to the above.
The relative relationship between the distance distribution between the geometric cylindrical surface 431 of the polarization separation element 43 and the cover glass 411 of the imaging element 41 and the inclination angle of the planar surface light source 42 will be further described below. Please refer to fig. 11, which is a schematic diagram illustrating a geometric concept of the display apparatus shown in fig. 4 marked by a coordinate system. In the coordinate system shown in fig. 11, the first coordinate axis (X axis) is parallel to a side of the imaging plane 414 of the imaging device 41 (in the embodiment, the side refers to the short side 4141 of the imaging plane 414, see fig. 4, but not limited thereto) and perpendicular to the normal of the imaging plane 414, and the origin X of the first coordinate axis (X axis) is perpendicular to the normal of the imaging plane 4140Is located at the midpoint of the short side 4141 of the image forming surface 414, and the axial direction of the first coordinate axis (X-axis) is the direction toward the planar surface light source 42. Also, as shown in FIG. 11In the coordinate system shown, the second coordinate axis (Y-axis) is parallel to the normal line of the imaging surface 414 of the imaging element 41, and the origin Y of the second coordinate axis (Y-axis)0Is located on the upper surface of the imaging element 41 (i.e., the upper surface 4111 of the upper cover glass 411), and the axial direction of the second coordinate axis (Y axis) is the direction toward the polarization separation element 43.
Furthermore, the normal of the imaging surface 414 of the imaging element 41 and the normal of the light emitting surface 421 of the planar surface light source 42 form an included angle θtAt any position G on the imaging surface 414 of the imaging element 41iCan be defined as X according to a first coordinate axis (X axis)iAnd the position GiThe separation distance extending up to the geometric cylinder 431 of the polarization separation element 43 along the normal to the imaging plane 414 can be defined as MiAnd the position GiThe spacing distance extending upward to the upper surface of the imaging element 41 (i.e., the upper surface of the cover glass 411) along the normal line of the imaging plane 414 can be defined as Ni(ii) a Wherein, the half length dX of the short side 4141 of the imaging surface 414 of the imaging element 41 is 2.75 millimeters (mm) or less, and the display device 4 satisfies the following relational expressions (1) to (4):
(1)-0.047385Xi 2+0.771625Xi+3.4≤Yi；
(2)Yi≤-0.047385Xi 2+0.771625Xi+5；
(3)Yi＝Mi-Ni(ii) a And
(4)69°≤θt≤78°；
and when the half length dX of the short side 4141 of the image plane 414 is greater than 2.75 millimeters (mm) and is 3.5 millimeters (mm) or less, the display device 4 satisfies the following relational expressions (5) to (8):
(5)-0.043299Xi 2+0.745345Xi+4≤Yi；
(6)Yi≤-0.043299Xi 2+0.745345Xi+6；
(7)Yi＝Mi-Ni(ii) a And
(8)68.5°≤θt≤82.5°。
on the other hand, the arbitrary position G on the imaging surface 414 of the imaging element 41iWhen moving axially further to the first coordinate axis (X axis), i.e. at any one of the positions GiCloser to the planar surface light source 42 so that X isiThe larger the size, the arbitrary position GiA spacing distance M extending up to the geometric cylinder 431 of the polarization separation element 43 along the normal to the imaging plane 414iThe larger the size.
When the display device 4 of the present invention satisfies the above relationship, the illumination light beam L1 provided by the planar surface light source 42 can be uniformly irradiated on the image plane 414 of the imaging device 41, and the uniformity of the illumination on the image plane 414 of the imaging device 41 is also defined in the present invention. Please refer to fig. 12, which illustrates the position distribution of a plurality of positions P1-P13 on the image plane 414 of the imaging device 41 used for calculating the illuminance uniformity and the relative position relationship between the positions P1-P13 and the periphery of the image plane 414, for example, the distance between the position P1 and the top of the image plane 414 is 16.6% of the length of the left side of the image plane 414, the distance between the position P1 and the left side of the image plane 414 is 16.6% of the length of the top of the image plane 414, and the rest of the positions P2-P13 are similar, and thus, they will not be described again. In addition, the energies obtained at the positions P1 through P13 within the viewing angle of the specific pixel after the illumination beam L1 is projected thereon can be respectively represented as E1 through E13, and the illuminance uniformity U on the imaging surface 414 of the imaging element 41 is defined as the following relationship:
U＝(Emin/Emax)×100％；
wherein E isminIs the minimum of the energies E1-E13, and EmaxThe maximum of these energies E1-E13.
Preferably, but not limited thereto, when the half length dX of the short side 4141 of the image plane 414 is 2.75 millimeters (mm) or less, the display device 4 further satisfies one of the following relational expressions (a1) to (a 6):
(a1) when X is presentiWhen 0 is satisfied, Y is not less than 3.6i<3.8 (see also the tenth, eleventh, twelfth embodiments shown later);
(a2) when X is presentiWhen 0 is satisfied, Y is not less than 3.8i<4.0 (see the seventh, eighth, ninth, and nineteenth embodiments shown later);
(a3) when X is presentiWhen 0 is satisfied, 4.0 is not more than Yi<4.2 (see also the sixth, seventeen, eighteen, twenty-one embodiments shown later);
(a4) when X is presentiWhen 0 is satisfied, 4.2 is not more than Yi<4.4 (see also the fifth, sixteenth, twenty-third, twenty-fifth, twenty-sixth, twenty-seventh embodiments shown later);
(a5) when X is presentiWhen 0 is satisfied, 4.4. ltoreq. Yi<4.6 (see also the third, fourth, thirteen, fourteen, twenty-two, twenty-four embodiments shown later); and
(a6) when X is presentiWhen 0 is satisfied, Y is not less than 4.6i<4.8 (see the first, second and fifteenth embodiments shown later); and when the half length dX of the short side 4141 of the image plane 414 is greater than 2.75 millimeters (mm) and is 3.5 millimeters (mm) or less, the display device 4 further satisfies one of the relationships (b1) to (b8) shown below:
(b1) when X is presentiWhen 0 is satisfied, 4.2 is not more than Yi<4.4 (see also the thirty-eighth embodiment shown later);
(b2) when X is presentiWhen 0 is satisfied, 4.4. ltoreq. Yi<4.6 (see also the thirty-seventeen, thirty-nine, forty-one, fifty-three, fifty-four embodiments shown later);
(b3) when X is presentiWhen 0 is satisfied, Y is not less than 4.6i<4.8 (see also the thirty-fourth, thirty-sixth, fifty-second embodiments shown later);
(b4) when X is presentiWhen 0 is satisfied, Y is not less than 4.8i<5.0 (see also the thirty-first, thirty-third, thirty-five, forty-nine, fifty-one, sixty-two, sixty-three embodiments shown later);
(b5) when X is presentiWhen 0 is satisfied, Y is not less than 5.0i<5.2 (see also the forty-eighth, fifty-fifth, fifty-seventh, fifty-eighth, fifty-ninth embodiments shown later);
(b6) when X is presentiWhen 0 is satisfied, Y is not less than 5.2i<5.4 (see also the thirty-third, thirty-second, forty-third, forty-fifth, forty-sixth, forty-seventh, fifty-fifth, fifty-sixth embodiments shown later);
(b7) when X is presentiWhen 0 is satisfied, Y is not less than 5.4i<5.6 (see also the twenty-ninth, forty-second and forty-fourth embodiments shown later); and
(b8) when X is presentiWhen 0 is satisfied, Y is not less than 5.6i<5.8 (see also the twenty-eighth embodiment shown later).
Please refer to tables 1 to 63 shown below, which respectively show sixty three embodiments satisfying the relations (1) to (4) or the relations (5) to (8), under which the illuminance uniformity U on the image plane 414 of the imaging device 41 can reach more than 85%.
Figure BDA0001902965890000131
Figure BDA0001902965890000132
Figure BDA0001902965890000133
Figure BDA0001902965890000134
Figure BDA0001902965890000135
Figure BDA0001902965890000141
Figure BDA0001902965890000142
Figure BDA0001902965890000143
Figure BDA0001902965890000144
Figure BDA0001902965890000145
Figure BDA0001902965890000146
Figure BDA0001902965890000147
Figure BDA0001902965890000151
Figure BDA0001902965890000152
Figure BDA0001902965890000153
Figure BDA0001902965890000154
Figure BDA0001902965890000155
Figure BDA0001902965890000156
Figure BDA0001902965890000157
Figure BDA0001902965890000161
Figure BDA0001902965890000162
Figure BDA0001902965890000163
Figure BDA0001902965890000164
Figure BDA0001902965890000165
Figure BDA0001902965890000166
Figure BDA0001902965890000167
Figure BDA0001902965890000171
Figure BDA0001902965890000172
Figure BDA0001902965890000173
Figure BDA0001902965890000174
Figure BDA0001902965890000175
Figure BDA0001902965890000176
Figure BDA0001902965890000177
Figure BDA0001902965890000181
Figure BDA0001902965890000182
Figure BDA0001902965890000183
Figure BDA0001902965890000184
Figure BDA0001902965890000185
Figure BDA0001902965890000186
Figure BDA0001902965890000187
Figure BDA0001902965890000191
Figure BDA0001902965890000192
Figure BDA0001902965890000193
Figure BDA0001902965890000194
Figure BDA0001902965890000195
Figure BDA0001902965890000196
Figure BDA0001902965890000197
Figure BDA0001902965890000201
Figure BDA0001902965890000202
Figure BDA0001902965890000203
Figure BDA0001902965890000204
Figure BDA0001902965890000205
Figure BDA0001902965890000206
Figure BDA0001902965890000207
Figure BDA0001902965890000211
Figure BDA0001902965890000212
Figure BDA0001902965890000213
Figure BDA0001902965890000214
Figure BDA0001902965890000215
Figure BDA0001902965890000216
Figure BDA0001902965890000217
Figure BDA0001902965890000221
Figure BDA0001902965890000222
According to the above description, the display device of the present invention, by matching the geometric cylindrical surface of the polarization separation element and the top cover glass of the imaging element with the specific inclination angle of the planar surface light source under the specific distance distribution, not only can the illumination light beam provided by the planar surface light source be uniformly irradiated on the imaging surface of the imaging element within the specific viewing angle, but also the distance between the imaging surface of the imaging element and the polarization separation element can be shortened, thereby reducing the overall thickness and volume of the display device. In addition, the polarized light separating element of the display device of the invention does not need to be manufactured by injection molding or grinding of a precise optical element and does not need to be matched with the precise optical element, so the polarized light separating element has the advantages of simple element manufacture and cost, and has industrial utilization value.
The above-mentioned embodiments are merely illustrative for explaining the principle of the present invention and its efficacy, and explaining the technical features of the present invention, and are not intended to limit the scope of the present invention. Any changes or equivalent arrangements which can be easily made by those skilled in the art without departing from the technical principle and spirit of the present invention belong to the scope of the present invention. Accordingly, the scope of the invention should be determined from the following claims.

Claims (30)

1. A display device, comprising:
an imaging element having an imaging surface for providing an image;
a planar surface light source having a light-emitting surface for providing a plurality of illumination beams, wherein a normal of the light-emitting surface and a normal of the image plane are in a non-perpendicular configuration; and
a polarized light separating element, which is arranged between the plane surface light source and the imaging element and is provided with a geometric cylinder, and the geometric cylinder is used for projecting at least part of the illuminating light beam which comes from the plane surface light source and belongs to a first polarization onto the geometric cylinder and generating reflection so as to enable at least part of the illuminating light beam which belongs to the first polarization to advance towards the imaging element; the geometric cylindrical surface is used for allowing at least part of the imaging light beam from the imaging element and belonging to the second polarization to pass through so as to enable the image to be presented outwards.
2. The display apparatus according to claim 1, wherein when a half length of a side of the image plane is less than 2.75 mm, the display apparatus satisfies the following relation:
-0.047385Xi 2+0.771625Xi+3.4≤Yi；
Yi≤-0.047385Xi 2+0.771625Xi+5；
Yi＝Mi-Ni(ii) a And
69°≤θt≤78°；
wherein, XiOn the image forming planeA position defined according to a coordinate axis parallel to the side of the imaging plane and perpendicular to the normal of the imaging plane, and MiA separation distance, N, for the position on the imaging plane extending up to the geometric cylinder along the normal of the imaging planeiA spacing distance, θ, extending from the position on the imaging surface to an upper surface of the imaging element along the normal of the imaging surfacetIs an angle between the normal of the imaging plane and the normal of the light-emitting surface.
3. The display device according to claim 2, wherein the display device further satisfies one of the following relations (a1) to (a 6):
(a1) when X is presentiWhen 0 is satisfied, Y is not less than 3.6i<3.8；
(a2) When X is presentiWhen 0 is satisfied, Y is not less than 3.8i<4.0；
(a3) When X is presentiWhen 0 is satisfied, 4.0 is not more than Yi<4.2；
(a4) When X is presentiWhen 0 is satisfied, 4.2 is not more than Yi<4.4；
(a5) When X is presentiWhen 0 is satisfied, 4.4. ltoreq. Yi<4.6; and
(a6) when X is presentiWhen 0 is satisfied, Y is not less than 4.6i<4.8。
4. The display apparatus according to claim 1, wherein when a half of a side of the image plane is longer than 2.75 mm and less than 3.5 mm, the display apparatus satisfies the following relation:
-0.043299Xi 2+0.745345Xi+4≤Yi；
Yi≤-0.043299Xi 2+0.745345Xi+6；
Yi＝Mi-Ni(ii) a And
68.5°≤θt≤82.5°；
wherein, XiIs a position on the imaging plane defined according to a coordinate axisParallel to the side of the imaging plane and perpendicular to the normal of the imaging plane, and MiA separation distance, N, for the position on the imaging plane extending up to the geometric cylinder along the normal of the imaging planeiA spacing distance, θ, extending from the position on the imaging surface to an upper surface of the imaging element along the normal of the imaging surfacetIs an angle between the normal of the imaging plane and the normal of the light-emitting surface.
5. The display device of claim 4, further complying with one of the following relationships (b1) to (b 8):
(b1) when X is presentiWhen 0 is satisfied, 4.2 is not more than Yi<4.4；
(b2) When X is presentiWhen 0 is satisfied, 4.4. ltoreq. Yi<4.6；
(b3) When X is presentiWhen 0 is satisfied, Y is not less than 4.6i<4.8；
(b4) When X is presentiWhen 0 is satisfied, Y is not less than 4.8i<5.0；
(b5) When X is presentiWhen 0 is satisfied, Y is not less than 5.0i<5.2；
(b6) When X is presentiWhen 0 is satisfied, Y is not less than 5.2i<5.4；
(b7) When X is presentiWhen 0 is satisfied, Y is not less than 5.4i<5.6; and
(b8) when X is presentiWhen 0 is satisfied, Y is not less than 5.6i<5.8。
6. The display device according to claim 2 or 4, wherein the imaging element comprises a cover glass, an interlayer and a circuit board, and the interlayer is located between the cover glass and the circuit board; the imaging surface is located in the middle layer, and the upper surface of the imaging element is the upper surface of the upper cover glass.
7. The display apparatus according to claim 1, wherein the image plane has a position defined according to a coordinate axis, and the coordinate axis is parallel to a side of the image plane and perpendicular to the normal of the image plane; wherein, a distance between the position on the imaging plane and the geometric cylinder along the normal of the imaging plane is larger as the position on the imaging plane moves to an axial direction of the coordinate axis.
8. The display apparatus according to claim 2, 4 or 7, wherein the image plane is rectangular, and the side of the image plane is a short side of the image plane.
9. The display device as claimed in claim 1, wherein the planar light source comprises a substrate, a plurality of light emitting diodes and a diffuser, and the plurality of light emitting diodes are disposed on the substrate and provide a plurality of light beams, and the plurality of light beams form a planar light source after passing through the diffuser.
10. The display device as claimed in claim 1, wherein the planar light source comprises a light chamber, at least one LED and a diffuser, and the at least one LED and the diffuser are respectively located at two ends of the light chamber; the light-emitting diode is used for providing a plurality of light beams, and the light beams travel in the light chamber to be projected and diffusely reflected to the diffusion sheet and form a surface light source after passing through the diffusion sheet.
11. The display device as claimed in claim 1, wherein the planar light source comprises at least one LED and a light guide plate, the at least one LED provides a plurality of light beams, and the light guide plate guides the light beams to travel by projecting the light beams therein, so that the light beams form a planar light source after passing through the light guide plate.
12. The display device according to claim 9, 10 or 11, wherein the planar light source further comprises a polarizer for passing the plurality of light beams therethrough to output the plurality of illumination light beams of the first polarization outwardly.
13. The display device according to claim 1, wherein the imaging element is a single crystal silicon reflective liquid crystal element.
14. The display device according to claim 1, wherein the polarization separation element is a reflective polarizer sheet or a reflective polarization intensifying film.
15. The display device according to claim 1, wherein the polarization separation element is in the form of a film.
16. A display device, comprising:
an imaging element having an imaging surface for providing an image;
a planar surface light source for providing a plurality of illumination beams; and
a polarized light separating element, which is arranged between the plane surface light source and the imaging element, and is used for projecting and reflecting at least part of the illuminating light beam from the plane surface light source and belonging to a first polarization on the polarized light separating element, so that at least part of the illuminating light beam belonging to the first polarization advances towards the imaging element, and at least part of the imaging light beam from the imaging element and belonging to a second polarization passes through the polarized light separating element, so that the image is presented outwards;
the position on the imaging surface is defined according to a coordinate axis, the coordinate axis is parallel to a side of the imaging surface and perpendicular to a normal of the imaging surface, and a distance between the position on the imaging surface and the polarization separation element extending upward along the normal of the imaging surface is larger when the position on the imaging surface moves toward an axial direction of the coordinate axis.
17. The display apparatus of claim 16, wherein the planar light source has a light emitting surface, and a normal of the light emitting surface is disposed non-perpendicularly to the normal of the image plane.
18. The display apparatus according to claim 17, wherein when the half length of the side of the image plane is less than 2.75 mm, the display apparatus satisfies the following relation:
-0.047385Xi 2+0.771625Xi+3.4≤Yi；
Yi≤-0.047385Xi 2+0.771625Xi+5；
Yi＝Mi-Ni(ii) a And
69°≤θt≤78°；
wherein, XiM is the position on the imaging plane defined according to the coordinate axisiThe position on the imaging plane extends up to the separation distance of the polarization separation element along the normal of the imaging plane, NiA spacing distance, θ, extending from the position on the imaging surface to an upper surface of the imaging element along the normal of the imaging surfacetIs an angle between the normal of the imaging plane and the normal of the light-emitting surface.
19. The display device of claim 18, further complying with one of the following relationships (a1) to (a 6):
(a1) when X is presentiWhen 0 is satisfied, Y is not less than 3.6i<3.8；
(a2) When X is presentiWhen 0 is satisfied, Y is not less than 3.8i<4.0；
(a3) When X is presentiWhen 0 is satisfied, 4.0 is not more than Yi<4.2；
(a4) When X is presentiWhen 0 is satisfied, 4.2 is not more than Yi<4.4；
(a5) When X is presentiWhen 0 is satisfied, 4.4. ltoreq. Yi<4.6; and
(a6) when X is presentiWhen 0 is satisfied, Y is not less than 4.6i<4.8。
20. The display device according to claim 17, wherein when the half length of the side of the image plane is greater than 2.75 mm and less than 3.5 mm, the display device satisfies the following relation:
-0.043299Xi 2+0.745345Xi+4≤Yi；
Yi≤-0.043299Xi 2+0.745345Xi+6；
Yi＝Mi-Ni(ii) a And
68.5°≤θt≤82.5°；
wherein, XiM is the position on the imaging plane defined according to the coordinate axisiThe position on the imaging plane extends up to the separation distance of the polarization separation element along the normal of the imaging plane, NiA spacing distance, θ, extending from the position on the imaging surface to an upper surface of the imaging element along the normal of the imaging surfacetIs an angle between the normal of the imaging plane and the normal of the light-emitting surface.
21. The display device of claim 20, further complying with one of the following relationships (b1) to (b 8):
(b1) when X is presentiWhen 0 is satisfied, 4.2 is not more than Yi<4.4；
(b2) When X is presentiWhen 0 is satisfied, 4.4. ltoreq. Yi<4.6；
(b3) When X is presentiWhen 0 is satisfied, Y is not less than 4.6i<4.8；
(b4) When X is presentiWhen 0 is satisfied, Y is not less than 4.8i<5.0；
(b5) When X is presentiWhen 0 is satisfied, Y is not less than 5.0i<5.2；
(b6) When X is presentiWhen 0 is satisfied, Y is not less than 5.2i<5.4；
(b7) When X is presentiWhen 0 is satisfied, Y is not less than 5.4i<5.6; and
(b8) when X is presentiWhen 0 is satisfied, Y is not less than 5.6i<5.8。
22. The display apparatus according to claim 18 or 20, wherein the imaging element comprises a cover glass, an interlayer and a circuit board, and the interlayer is located between the cover glass and the circuit board; the imaging surface is located in the middle layer, and the upper surface of the imaging element is the upper surface of the upper cover glass.
23. The display device as claimed in claim 16, wherein the planar light source comprises a substrate, a plurality of light emitting diodes and a diffuser, and the plurality of light emitting diodes are disposed on the substrate and provide a plurality of light beams, and the plurality of light beams form a planar light source after passing through the diffuser.
24. The display device as claimed in claim 16, wherein the planar light source comprises a light chamber, at least one LED and a diffuser, and the at least one LED and the diffuser are respectively located at two ends of the light chamber; the light-emitting diode is used for providing a plurality of light beams, and the light beams travel in the light chamber to be projected and diffusely reflected to the diffusion sheet and form a surface light source after passing through the diffusion sheet.
25. The display apparatus as claimed in claim 16, wherein the planar light source comprises at least one LED and a light guide plate, and the at least one LED provides a plurality of light beams that form a planar light source after passing through the light guide plate.
26. The display device as claimed in claim 23, 24 or 25, wherein the planar light source further comprises a polarizer for passing the plurality of light beams therethrough to output the plurality of illumination light beams of the first polarization outwardly.
27. The display apparatus of claim 16, wherein the image plane is rectangular, and the side of the image plane is a short side of the image plane.
28. The display device according to claim 16, wherein the imaging element is a single crystal silicon reflective liquid crystal element.
29. The display device according to claim 16, wherein the polarization separation element is a reflective polarizer sheet or a reflective polarization intensifying film.
30. The display device according to claim 16, wherein the polarization separation element is in the form of a film.
CN201811519910.5A 2018-12-12 2018-12-12 Display device Pending CN111308727A (en)

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Application publication date: 20200619