CN111999898A - Optical display system and display device - Google Patents

Optical display system and display device Download PDF

Info

Publication number
CN111999898A
CN111999898A CN202010990211.XA CN202010990211A CN111999898A CN 111999898 A CN111999898 A CN 111999898A CN 202010990211 A CN202010990211 A CN 202010990211A CN 111999898 A CN111999898 A CN 111999898A
Authority
CN
China
Prior art keywords
light
linearly polarized
polarized light
layer
display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010990211.XA
Other languages
Chinese (zh)
Inventor
姚建峰
孙川
汪志强
马鑫
王秋里
王新宇
谭丁炀
栗可
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BOE Technology Group Co Ltd, Beijing BOE Optoelectronics Technology Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to CN202010990211.XA priority Critical patent/CN111999898A/en
Publication of CN111999898A publication Critical patent/CN111999898A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features
    • 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
    • G02F1/133528—Polarisers

Landscapes

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

Abstract

The embodiment of the application provides an optical display system and a display device, relates to the technical field of optics, and is used for reducing light loss generated by an optical element when light rays emitted by a display screen are transmitted along a preset light path in NED equipment. The optical display system comprises a display screen, a polarization reflecting layer and a dimming film layer. The display screen is used for emitting display light. The polarization reflecting layer is arranged on the light emitting side of the display screen and used for reflecting light rays with the vibration direction vertical to the light transmission axis of the polarization reflecting layer in display light rays to form first linearly polarized light. The dimming film layer is arranged on the light emitting side of the display screen and used for converting the first linearly polarized light into the second linearly polarized light. The vibration direction of the second linearly polarized light is vertical to the vibration direction of the first linearly polarized light. In addition, the polarization reflective layer also serves to transmit a second linearly polarized light. The optical display system is used for realizing near-eye display.

Description

Optical display system and display device
Technical Field
The present application relates to the field of optical technologies, and in particular, to an optical display system and a display device.
Background
With the continuous development of near to eye display (NED) technology, users can realize the display experience of Augmented Reality (AR) or Virtual Reality (VR) when using a device adopting the NED technology.
Currently, NED devices have various optical elements that can change the propagation direction of incident light to form a predetermined light path. Therefore, light rays emitted by the display screen can reach human eyes after passing through the preset light path so as to realize AR or VR display. However, in the process of transmitting the light emitted from the display screen along the predetermined optical path, there is a certain light loss after passing through each optical element, so that the brightness of the light finally reaching human eyes is greatly reduced (for example, reduced to about 12%), which affects the NED effect.
Disclosure of Invention
The embodiment of the application provides an optical display system and a display device, which are used for reducing light loss generated by an optical element when light rays emitted by a display screen are transmitted along a preset light path in NED equipment.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in one aspect of the embodiments of the present application, an optical display system is provided. The optical display system comprises a display screen, a polarization reflecting layer and a dimming film layer. Wherein, the display screen is used for emitting display light. The polarization reflecting layer is arranged on the light emitting side of the display screen and used for reflecting light rays with the vibration direction vertical to the light transmission axis of the polarization reflecting layer in display light rays to form first linearly polarized light. The dimming film layer is arranged on the light emitting side of the display screen and used for converting the first linearly polarized light into the second linearly polarized light. The vibration direction of the second linearly polarized light is vertical to the vibration direction of the first linearly polarized light. In addition, the polarization reflective layer also serves to transmit a second linearly polarized light. In summary, in the optical display system, the display light emitted from the display screen forms the first linearly polarized light after passing through the polarization reflective layer, and the first linearly polarized light is incident to the dimming film layer. Under the dimming effect of the dimming film layer, the first linearly polarized light can be converted into second linearly polarized light with the vibration direction being the same as the light transmission axis of the polarization reflection layer. Therefore, the second linearly polarized light can completely penetrate through the polarization reflection layer in the process of being incident to human eyes, so that light loss cannot occur in the process of being incident to the human eyes, the brightness of a display image seen by the human eyes is improved, and the aim of improving the NED display effect is fulfilled.
Optionally, the dimming film layer includes a quarter-wave plate and a transflective layer. The transflective layer is arranged on one side of the quarter-wave plate far away from the polarization reflection layer and is used for reflecting one part of light rays from the quarter-wave plate to the quarter-wave plate and transmitting the other part of the light rays. In this way, the human eye can see the scene in the external environment of the display device through the part of the light transmitted to the external environment of the display device, and the scene is superposed and fused with the received image formed by the second linearly polarized light, so that AR display is realized.
Optionally, the dimming film layer comprises: the reflection layer is arranged on one side, far away from the polarization reflection layer, of the quarter-wave plate and used for reflecting light rays from the quarter-wave plate to the quarter-wave plate. At this time, the human eye can receive only the image formed by the second linearly polarized light, and thereby VR display is realized.
Optionally, the display screen includes a liquid crystal display panel, a backlight module, and a polarizer. The liquid crystal display panel comprises liquid crystal molecules. The backlight module is arranged on the non-light-emitting side of the liquid crystal display panel and used as a light source of the liquid crystal display panel. The polaroid is arranged between the liquid crystal display panel and the backlight module and used for converting light rays emitted by the backlight module into linearly polarized light; the transmission axis of the polaroid is parallel to that of the polarization reflecting layer. The linearly polarized light passes through the liquid crystal molecules to form display light, and the display light has the same vibration direction as the first linearly polarized light. In the embodiment of the application, an upper polaroid is not required to be arranged on the light emitting side of the display screen, so that the structure of the display device can be simplified. Meanwhile, the residual light effect of the first linearly polarized light emitted to the dimming film layer by the component consisting of the display screen and the polarization reflecting layer can be the same as that of an original image displayed by the existing LCD display device with the upper polarizer and the lower polarizer, so that the light effect of light rays incident to the dimming film layer is obviously improved. For example, when the luminous efficiency of an original image displayed by an LCD display device having upper and lower polarizers is set to 100%, the residual luminous efficiency of the first linearly polarized light emitted from the assembly of the display screen and the polarization reflective layer to the dimming film layer is approximately 100%.
Optionally, the display screen comprises a plurality of light emitting devices. Wherein the light emitting device is used for emitting display light. Similarly, the structure of the display device can be simplified because the upper polaroid is not required to be arranged on the light-emitting side of the display screen in the embodiment of the application. Meanwhile, the residual light effect of the first linearly polarized light emitted to the dimming film layer by the assembly consisting of the display screen and the polarization reflecting layer can be the same as that of an original image displayed by the OLED display device with the upper polarizer at present, so that the light effect of light incident to the dimming film layer is obviously improved. For example, when the luminous efficiency of the original image displayed by the OLED display device having the upper polarizer is set to 100%, the residual luminous efficiency of the first linearly polarized light emitted from the assembly of the display screen and the polarization reflection layer to the dimming film layer is approximately 100%.
Optionally, the optical display system further comprises a spherical mirror. The spherical mirror is arranged on one side, away from the polarization reflecting layer, of the dimming film layer and is connected with the dimming film layer, and the concave surface of the spherical mirror faces the polarization reflecting layer. Therefore, the spherical mirror can bear the dimming film layer, and in addition, the second linearly polarized light provided by the dimming film layer to human eyes can be converged through the concave surface design of the spherical mirror, so that more second linearly polarized light can enter the human eyes, and the purpose of providing display brightness is achieved. Optionally, the optical display system further comprises a plane mirror. The plane mirror is arranged on one side of the dimming film layer far away from the polarization reflecting layer and is connected with the dimming film layer. The plane mirror has simple structure, thereby being beneficial to simplifying the manufacturing process and achieving the purpose of reducing the cost.
Optionally, the optical display system further comprises a transparent substrate. The transparent substrate is arranged on one side of the polarization reflecting layer, which is far away from the dimming film layer, and is connected with the polarization reflecting layer. The transparent substrate is used for carrying a polarization reflection film. Optionally, an included angle α is formed between the surface of the polarization reflection layer far away from the dimming film layer and the display surface of the display screen, and the included angle α satisfies: alpha is more than or equal to 40 degrees and less than or equal to 50 degrees. Therefore, the first linearly polarized light formed after the display light is incident to the polarization reflection layer can be incident to the area where the spherical mirror is located as much as possible, and under the convergence effect of the spherical mirror, the second linearly polarized light provided by the light modulation film layer to human eyes is more, and the display brightness of the image seen by the human eyes is further improved.
In another aspect of the embodiments of the present application, a display device is provided. The display device includes the optical display system of any one of the above. The display device has the same technical effects as the optical display system provided by the foregoing embodiment, and details are not repeated herein.
Based on this, through the optical display system that this application provided, the display light that the display screen sent forms first linearly polarized light after through polarization reflecting layer, and this first linearly polarized light incides to the rete of adjusting luminance. Under the dimming effect of the dimming film layer, the first linearly polarized light can be converted into second linearly polarized light with the vibration direction being the same as the light transmission axis of the polarization reflection layer. Therefore, the second linearly polarized light can completely penetrate through the polarization reflection layer in the process of being incident to human eyes, so that light loss cannot occur in the process of being incident to the human eyes, the brightness of a display image seen by the human eyes is improved, and the aim of improving the NED display effect is fulfilled.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of an optical display system that can be disposed inside the display device shown in FIG. 1 according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of another optical display system that can be disposed inside the display device shown in FIG. 1 according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of another optical display system that can be disposed inside the display device shown in FIG. 1 according to an embodiment of the present disclosure;
FIG. 5a is a schematic structural diagram of another optical display system that can be disposed inside the display device shown in FIG. 1 according to an embodiment of the present disclosure;
FIG. 5b is a schematic diagram illustrating an optical display system that can be disposed inside the display device shown in FIG. 1 according to the prior art;
FIG. 6 is a schematic structural diagram of another optical display system that can be disposed inside the display device shown in FIG. 1 according to an embodiment of the present disclosure;
FIG. 7 is a schematic structural diagram of another optical display system that can be disposed inside the display device shown in FIG. 1 according to an embodiment of the present disclosure;
FIG. 8 is a schematic structural diagram of another optical display system that can be disposed inside the display device shown in FIG. 1 according to an embodiment of the present disclosure;
reference numerals:
01-display device(ii) a 10-an optical display system; 20-a display screen; 201-liquid crystal display panel; 211-an array substrate; 221-pair of cassette substrates; 231-a liquid crystal layer; 241-an upper polarizer; 242-lower polarizer; 202-a backlight module; 21-a light emitting device; 22-a polarizer; 30-a polarizing reflective layer; 40-a dimming film layer; 401-1/4 wave plates; 402-a transflective layer; 403-a reflective layer; 50-a transparent substrate; 60-a spherical mirror; 70-a magnifying glass; 80-a first transflective layer; 90-a second transflective layer; l isdis-display light; l1 — first linearly polarized light; l2-second linearly polarized light.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature.
Further, in this application, directional terms, such as "left," "right," "upper," and "lower," are defined with respect to the schematically-disposed orientation of the components in the drawings, and it is to be understood that these directional terms are relative concepts that are used for descriptive and clarity purposes and that will vary accordingly depending on the orientation in which the components are disposed in the drawings.
In this application, unless expressly stated or limited otherwise, the term "coupled" is to be construed broadly, and thus, for example, may be directly connected or indirectly connected through intervening media.
The embodiment of the application provides a display device 01. The display device 01 may include a display device using NED technology, such as smart glasses as shown in fig. 1, or a head-mounted display device (abbreviated as a head display), etc. Above-mentioned intelligent glasses and first demonstration can realize AR or VR demonstration. The present application does not specifically limit the specific form of the display device 01.
The display device 01 provided in the embodiment of the present application may include an optical display system 10 as shown in fig. 2. The optical display system 10 may include a display screen (display panel)20, a polarizing reflective layer 30, and a dimming film layer 40.
The display screen 20 is used for emitting display light Ldis. In some embodiments of the present application, as shown in FIG. 3, the display 20 may be a Liquid Crystal Display (LCD). In this case, the display panel 20 may include a liquid crystal display panel 201 and a backlight unit (BLU) 202 as shown in fig. 3.
The liquid crystal display panel 201 may include an array substrate (array substrate)211 and a pair of cell substrates 221 opposing the array substrate 211. The array substrate 211 and the pair of cell substrates 221 after the pair of cells form a liquid crystal cell (cell). The display panel 20 further includes a liquid crystal layer 231 between the array substrate 211 and the opposite-to-cell substrate 221. When the display panel 20 is capable of displaying color images, the display panel 20 may further include a color filter layer (not shown), and the color filter layer may be disposed in the pair of box substrates 221, in which case, the pair of box substrates 221 may also be referred to as color filter substrates.
In addition, the backlight module 202 may be disposed on a non-light-emitting side (i.e., a side opposite to the light-emitting side) of the liquid crystal display panel 201 to provide light to the liquid crystal display panel 201.
Alternatively, in other embodiments of the present application, as shown in fig. 4, the display panel 20 may include a plurality of light emitting devices 21, for example, the light emitting devices 21 may be Organic Light Emitting Diodes (OLEDs). One of the light emitting devices 21 is disposed in each sub-pixel of the display panel 20, and the light emitting device 21 is used for emitting display light LdisSo that the display screen 20 is self-illuminating.
It should be noted that, this application is directed to a display screenThe specific form of the display screen 20 is not limited in particular, and for any of the display screens 20, it may include a plurality of sub-pixels (not shown in the drawings), and a plurality of (e.g., three) adjacent sub-pixels may be respectively configured to emit different lights, such as red (R), green (G), and blue (B), so as to implement a three-primary display. In this case, the display light L in the embodiment of the present applicationdisThe light source may be at least one of the R light, the G light, and the B light.
Further, as for any of the above-described display panels 20, as shown in fig. 3 or 4, the polarizing reflective layer 30 in the optical display system 10 may be disposed on the light exit side of the display panel 20 (i.e., the side of the display panel 20 for displaying images). In some embodiments of the present application, the optical display system 10 may further include a transparent substrate 50 for carrying the above-described polarizing reflective layer 30. The transparent substrate 50 is disposed on a side of the polarization reflective layer 30 away from the dimming film layer 40, and may be connected to the polarization reflective layer 30 through an optical adhesive (not shown).
The transparent substrate 50 may be a transparent glass substrate, a sapphire substrate, or a substrate made of a transparent resin material. The term "transparent" in the embodiments of the present application means that the light transmittance of the transparent substrate 50 can reach 85% or more.
The polarization reflective layer 30 can transmit light of which the vibration direction is the same as the transmission axis of the polarization reflective layer 30 among incident light, and reflect light of which the vibration direction is perpendicular to the transmission axis of the polarization reflective layer 30 among the incident light. For example, the polarization reflective layer 30 is used for reflecting the display light L incident to the polarization reflective layer 30disIn (3), light having a vibration direction perpendicular to the transmission axis of the polarization reflection layer 30 is reflected to form first linearly polarized light L1.
On this basis, as shown in fig. 3 or fig. 4, the dimming film 40 in the optical display system 10 can be disposed on the light-emitting side of the display screen 20. The dimming film 40 is used for converting the first linearly polarized light L1 into the second linearly polarized light L2. The vibration direction of the second linearly polarized light L2 is perpendicular to the vibration direction of the first linearly polarized light L1. As can be seen from the above, the vibration direction of the first linearly polarized light L1 is perpendicular to the light transmission axis of the polarization reflection layer 30, and therefore the vibration direction of the second linearly polarized light L2 is parallel to the light transmission axis of the polarization reflection layer 30. Further, the polarization reflective layer 30 can transmit light rays having a vibration direction parallel to the transmission axis of the polarization reflective layer 30 among the incident light rays, so that the second linearly polarized light L2 incident on the polarization reflective layer 30 can completely transmit through the polarization reflective layer 30. Therefore, the second linearly polarized light L2 does not generate light loss (i.e., light loss) in the process of transmitting through the polarization reflective layer 30.
In addition, because the human eyes and the dimming film layer 40 can be respectively disposed on two sides of the polarization reflective layer 30, the second linearly polarized light L2 can be incident to the human eyes after passing through the polarization reflective layer 30, so that the human eyes can see the image displayed on the display screen 20, thereby achieving the goal of NED.
As described above, in the optical display system 10 of the display device 01 according to the embodiment of the present application, as shown in fig. 3 or fig. 4, the display screen 20 emits the display light LdisAfter passing through the polarization reflection layer 30, a first linearly polarized light L1 is formed, and the first linearly polarized light L1 is incident to the dimming film layer 40. Under the dimming action of the dimming film layer 40, the first linearly polarized light L1 can be converted into the second linearly polarized light L2 having the same vibration direction as the transmission axis of the polarization reflection layer 30. Therefore, the second linearly polarized light L2 can completely penetrate through the polarization reflection layer 30 in the process of being incident to human eyes, so that light loss cannot occur in the process of being incident to the human eyes by the second linearly polarized light L2, the brightness of a display image seen by the human eyes is improved, and the purpose of improving the NED display effect is achieved.
In some embodiments of the present application, display light L incident on the polarizing reflective layer 30disMay be linearly polarized light. For example, as shown in FIG. 3, where the display panel 20 is an LCD, the display panel 20 may also include a polarizer 22. The polarizer 22 may be disposed between the liquid crystal display panel 201 and the backlight module 202. The polarizer 22 is used for converting the light emitted from the backlight module 202 into linearly polarized light. The linearly polarized light passes through liquid crystal molecules (not shown) in the liquid crystal layer 231, and the display light L is formed by the optical rotation of the liquid crystal moleculesdis. At this time, the display light LdisIs linearly polarized light.
Based on this, in some embodiments of the present application, the transmission axis of the polarizer 22 may be parallel to the transmission axis of the polarizing reflective layer 30. At this time, when light emitted from the backlight module 202, for example, white light, passes through the polarizer 22, linearly polarized light is formed (the vibration direction is parallel to the transmission axis of the polarizer 22). When the linearly polarized light is incident to the liquid crystal layer 231, the arrangement of the liquid crystal molecules in the liquid crystal layer 231 can be controlled, so that under the optical rotation of the liquid crystal molecules, the display light L emitted by each sub-pixel in the display screen 20 is generateddisIs deflected by 90 deg..
In this case, since the transmission axis of the polarizing plate 22 is parallel to the transmission axis of the polarization reflection layer 30, the display light L incident to the polarization reflection layer 30disIs perpendicular to the polarizing reflective layer 30. At this time, the polarized reflective layer 30 can make all the display light L emitted from the display screen 20disAre reflected to form the first linearly polarized light L1. The first linearly polarized light L1 may be white light. In addition, under the dimming action of the dimming film layer 40, the first linearly polarized light L1 can be converted into the second linearly polarized light L2 having the vibration direction parallel to the light transmission axis of the polarization reflection layer 30. The second linearly polarized light L2 is totally transmitted through the polarization reflection layer 30 and then incident on human eyes, and the human eyes can see a pure white picture.
When a user needs to see a gray-scale picture, the deflection angle of the liquid crystal molecules of each sub-pixel in the display screen 20 can be controlled to make the optical rotation angles of the liquid crystal molecules in different sub-pixels different, so that the vibration directions of the display light emitted from the sub-pixels are different. In this case, of the display light incident on the polarizing reflective layer 30, the vibration direction of the display light emitted from all the sub-pixels is not perpendicular to the transmission axis of the polarizing reflective layer 30. Therefore, the polarized reflective layer 30 can reflect the display light L emitted from each sub-pixel of the display panel 20disIn this case, the light beam having the oscillation direction parallel to the transmission axis of the polarization reflection layer 30 is transmitted, and the light beam having the oscillation direction perpendicular to the transmission axis is reflected to form the first linearly polarized light L1.
Since the optical rotation angles of the liquid crystal molecules in the sub-pixels are different, the brightness of the first linearly polarized light L1 emitted from the polarization reflection layer 30 and corresponding to the sub-pixels is different, and thus the brightness of the second linearly polarized light L2 incident to the human eye is different under the dimming action of the dimming film layer 40, so that the purpose of displaying gray-scale images is achieved.
As can be seen from the above description, when the display panel 20 is an LCD, the display panel 20 includes the polarizing plate 22, the polarizing plate 22 can convert the light emitted from the backlight module 202 into linearly polarized light, the polarizing reflective layer 30 can reflect the incident linearly polarized light with the vibration direction perpendicular to the transmission axis of the polarizing reflective layer 30 to form the first linearly polarized light L1, and the first linearly polarized light L1 forms the second linearly polarized light L2 that can be incident on the display image for the eyes of the person under the dimming action of the dimming film layer 40. Thus, the above-described polarizing reflective layer 30 may replace the upper polarizer 241 (shown in fig. 5 b) on the light exit side of the display screen 20, so that a user can see an image displayed by the display screen 20 as an LCD. Thus, in the embodiment of the present invention, the upper polarizer 241 on the light exit side of the display panel 20 is not required, and thus the structure of the display device 01 can be simplified.
In other embodiments of the present application, display light L incident on the polarizing reflective layer 30disMay be non-linearly polarized light. As shown in fig. 4, the display panel 20 is an OLED display panel, and the light-emitting side surface of the OLED display panel is not provided with a polarizer. At this time, the light emitted by the OLED display screen is linearly polarized light. After the non-linear polarized light enters the polarization reflection layer 30 as a display light, the polarization reflection layer 30 can transmit the light of the non-linear polarized light, which has a vibration direction parallel to the transmission axis of the polarization reflection layer 30, and reflect the light of the non-linear polarized light, which has a vibration direction perpendicular to the transmission axis of the polarization reflection layer 30. And, the light reflected by the polarization reflection layer 30 has the same vibration direction, thereby forming the above-mentioned first linearly polarized light L1.
In addition, as can be seen from the above, the light modulation film layer 40 is used for converting the first linearly polarized light L1 into the second linearly polarized light L2. The vibration direction of the second linearly polarized light L2 is perpendicular to the vibration direction of the first linearly polarized light L1. The structure of the dimming film layer 40 will be described below by taking the display screen 20 as an example of an LCD.
For example, in some embodiments of the present application, the light modulating film layer 40 may include a quarter-wave (1/4 for short) wave plate 401 and a transflective layer 402 as shown in fig. 5a, wherein the transflective layer 402 is disposed on a side of the 1/4 wave plate 401 away from the polarization reflective layer 30.
The 1/4 wave plate 401 can convert the incident first linearly polarized light L1 into circularly polarized light, and can deflect the vibration direction of the circularly polarized light by 45 ° to enter the transflective layer 402. The transflective layer 402 may be used to reflect a portion (e.g., half) of the circularly polarized light from the 1/4 wave plate 401 to the 1/4 wave plate 401 and transmit another portion (e.g., the other half) of the circularly polarized light from the 1/4 wave plate 401 to the external environment of the display device 01.
In this case, the circularly polarized light reflected by the transflective layer 402 to the 1/4 wave plate 401 passes through the 1/4 wave plate 401, is converted into linearly polarized light, and the vibration direction of the linearly polarized light is deflected again by 45 °, thereby forming the second linearly polarized light L2 incident on the polarization reflective layer 30. As can be seen from the above, the vibration direction of the first linearly polarized light L1 entering the 1/4 wave plate 401 is 90 ° (the sum of the two deflections of 45 °) different from the vibration direction of the second linearly polarized light L2 emitted from the 1/4 wave plate 401, and therefore the vibration direction of the second linearly polarized light L2 is perpendicular to the vibration direction of the first linearly polarized light L1.
In addition, since the vibration direction of the first linearly polarized light L1 is perpendicular to the light transmission axis of the polarization reflection layer 30, the vibration direction of the second linearly polarized light L2 is parallel to the light transmission axis of the polarization reflection layer 30, so that the second linearly polarized light L2 provided by the dimming film layer 40 to the polarization reflection layer 30 can be transmitted through the polarization reflection layer 30 without light loss.
Based on this, as can be seen from the above description, the transflective layer 402 in the dimming film layer 40 can reflect a part of circularly polarized light from the 1/4 wave plate 401 to the 1/4 wave plate 401, and transmit another part of circularly polarized light (indicated by a dashed arrow in fig. 5 a) to the external environment of the display device 01. In this case, the human eye can see the scene in the external environment of the display device 01 through the part of the light transmitted to the external environment of the display device 01, and superimpose and fuse the image formed by the received second linearly polarized light L2, thereby realizing AR display.
As can be seen from the above, the above-mentioned polarized reflective layer 30 can replace the upper polarizer 241 on the light-emitting side of the display screen 20, so that the user can see the image displayed by the display screen 20 as an LCD. Therefore, when the light efficiency of the original image displayed by the LCD display device with the upper and lower polarizers is set to 100%, the residual light efficiency of the first linearly polarized light L1 emitted to the dimming film layer 40 by the assembly of the display panel 20 and the polarization reflection layer 30 shown in fig. 5a is 100%. In this case, the residual optical effect of the light in the optical path formed by each component in the optical display system 10 shown in fig. 5a is shown in table 1.
TABLE 1
Location of light Residual light effect
The first linearly polarized light L1 emitted by the polarization reflection layer 30 100％
1/4 wave plate 401 emits light to the transflective layer 402 100％
The light reflected by the transflective layer 402 to the 1/4 wave plate 401 50％
1/4 wave plate 401 emits second linearly polarized light L2 to the polarization reflection layer 30 50％
Second linearly polarized light L2 transmitted through the polarization reflection layer 30 50％
Second linearly polarized light L2 received by human eyes 50％
As can be seen from table 1, in the optical display system 10 provided in the embodiment of the present application, the light of the first linearly polarized light L1 emitted by the polarization reflective layer 30 may have the same light effect as the original image displayed by the LCD display device having the upper and lower polarizers, and the light effect of the original image is preset to reach 100%. In addition, the residual luminous efficacy of the light passing through the first linearly polarized light L1 can be approximately maintained at 100%. The light ray passing through the 1/4 wave plate 401 has little optical loss and is therefore negligible. In this way, 50% of the light is lost in the light path formed by the components in the entire optical display system 10 only at the transflective layer 402 in the dimming film layer 40. The remaining light effect of the image seen by the human eye is 1/2 of the light effect of the original image (100%).
However, in the related art, as shown in fig. 5b, the first transflective layer 80 is usually disposed at the position of the polarization reflective layer 30, and only the second transflective layer 90 is disposed at the position of the dimming film layer 40. Thus, when the luminance of the original image displayed by the LCD device having the upper polarizer 241 and the lower polarizer 242 is set to be 100% as shown in table 2, the display light is lost when passing through the first transflective layer 80, the remaining luminance is 50%, the display light is lost again when passing through the second transflective layer 90, the remaining luminance is 25%, and the remaining luminance is 12.5%. Thus, the residual light effect of the image seen by human eyes, which is 1/8% of the light effect (100%) of the original image, is much smaller than the residual light effect (1/2% of the light effect of the original image) of the image finally provided by the optical display system 10 provided in the embodiment of the present application.
TABLE 2
Location of light Residual light effect
Display light L emitted from the display screen 20dis 100％
The light reflected from the first transflective layer 80 to the second transflective layer 90 50％
The second transflective layer 90 reflects the light to the first transflective layer 80 25％
Light passing through the first semi-transparent and semi-reflective layer 80 12.5％
Light received by human eyes 12.5％
In the above description, the display screen 20 is taken as an LCD, and the residual light effect of the light in the optical path formed by each component in the optical display system 10 is described. When the display screen 20 is an OLED, the optical display system 10 finally provides 1/2 equal to the residual light effect of the image to human eyes, and also reaches 1/2 equal to the light effect (100%) of the original image. And will not be described in detail herein.
On this basis, in order to carry the dimming film 40, in some embodiments of the present application, the optical display system 10 may include a spherical mirror 403 as shown in fig. 5 a. The spherical mirror 60 may be disposed on a side of the dimming film 40 away from the polarization reflective layer 30, and connected to the dimming film 40 through an optical adhesive (not shown). Further, the concave surface of the spherical mirror 60 may face the polarizing reflective layer 30. In this way, the spherical mirror 60 can not only bear the dimming film layer 40, but also perform the converging action as shown in fig. 6 on the second linearly polarized light L2 provided by the dimming film layer 40 to the human eye through its own concave design, so that more second linearly polarized light L2 can enter the human eye, and the purpose of providing the display brightness is achieved.
In addition, as shown in fig. 6, an included angle α is formed between a surface of the polarization reflection layer 30 away from the dimming film layer 40 and a plane (shown by a dotted line in fig. 6) where the display surface of the display screen 20 is located, and the included angle α may satisfy: alpha is more than or equal to 40 degrees and less than or equal to 50 degrees. Thus, the display light LdisThe first linearly polarized light L1 formed after being incident on the polarization reflection layer 30 can be incident on the area where the spherical mirror 60 is located as much as possible. Thus, under the convergence action of the spherical mirror 60, the second linearly polarized light L2 provided by the dimming film layer 40 to the human eye is increased, and the display brightness of the image seen by the human eye is further improved. Illustratively, the angle α may be 41 °, 43 °, 45 °, 46 °, or 48 °.
Furthermore, in some embodiments of the present application, as shown in FIG. 6, the optical display system 10 described above may further include a magnifying lens 70. The magnifying lens 70 may be a convex mirror with a convex surface away from the side of the display screen 20. In this case, the display light L emitted from the display screen 20 through the magnifying lens 70disAfter being diffused, the light enters the polarization reflection layer 30. Thus, the display light L can be madedisThe incident to the polarization reflecting layer 30 that can be more even for when polarization reflecting layer 30 transmitted or reflection treatment to the incident light, the resolution ratio of light processing was higher, was favorable to improving the fineness that people's eye received the picture.
Alternatively, in other embodiments of the present application, a flat mirror 61 as shown in fig. 7 may be used as the load-bearing component of the dimming film 40. The plane mirror 61 may be disposed on a side of the light modulation film 40 away from the polarization reflective layer 30, and connected to the light modulation film 40 through an optical adhesive (not shown). The plane mirror 61 has a simple structure, so that the manufacturing process is simplified, and the purpose of reducing the cost is achieved.
The above description is made by taking an example in which the dimming film layer 40 includes the 1/4 wave plate 401 and the transflective layer 402. Alternatively, for another example, in some embodiments of the present application, the dimming film layer 40 may include 1/4 wave plates 401 and a reflective layer 403 as shown in fig. 8. 1/4 the function of wave plate 401 is the same as described above and will not be described here.
In addition, the reflective layer 403 may be disposed on the side of the 1/4 wave plate 401 away from the polarization reflective layer 30, for reflecting all the light from the 1/4 wave plate 401 to the 1/4 wave plate 401. In this way, the reflective layer 403 in the dimming film layer 40 can reflect all the circularly polarized light from the 1/4 wave plate 401 to the 1/4 wave plate 401, and form the second linearly polarized light L2 provided to the human eye after passing through the 1/4 wave plate 401. In this case, the human eye can receive only the image formed by the second linearly polarized light L2 described above, thereby realizing VR display.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. An optical display system, comprising:
the display screen is used for emitting display light;
the polarization reflection layer is arranged on the light emergent side of the display screen and used for reflecting light rays with the vibration direction vertical to the light transmission axis of the polarization reflection layer in the display light rays to form first linearly polarized light;
the dimming film layer is arranged on the light emitting side of the display screen and used for converting the first linearly polarized light into second linearly polarized light; the vibration direction of the second linearly polarized light is vertical to the vibration direction of the first linearly polarized light;
wherein the polarization reflection layer is further configured to transmit the second linearly polarized light.
2. The optical display system of claim 1, wherein the dimming film layer comprises:
a quarter wave plate;
and the semi-transmitting and semi-reflecting layer is arranged on one side of the quarter-wave plate, which is far away from the polarization reflecting layer, and is used for reflecting one part of the light rays from the quarter-wave plate to the quarter-wave plate and transmitting the other part of the light rays.
3. The optical display system of claim 1, wherein the dimming film layer comprises:
a quarter wave plate;
the reflection layer is arranged on one side, far away from the polarization reflection layer, of the quarter-wave plate and used for reflecting light rays from the quarter-wave plate to the quarter-wave plate.
4. An optical display system as claimed in claim 2 or 3, characterized in that the display screen comprises:
a liquid crystal display panel including liquid crystal molecules;
the backlight module is arranged on the non-light-emitting side of the liquid crystal display panel and is used as a light source of the liquid crystal display panel;
the polaroid is arranged between the liquid crystal display panel and the backlight module and used for converting light rays emitted by the backlight module into linearly polarized light; the transmission axis of the polaroid is parallel to the transmission axis of the polarization reflection layer;
the linearly polarized light passes through the liquid crystal molecules to form the display light, and the display light and the first linearly polarized light have the same vibration direction.
5. An optical display system as claimed in claim 2 or 3, characterized in that the display screen comprises a plurality of light-emitting devices for emitting the display light.
6. An optical display system according to claim 2 or 3, characterized in that the optical display system further comprises:
the spherical mirror is arranged on one side, away from the polarization reflecting layer, of the dimming film layer and connected with the dimming film layer, and the concave surface of the spherical mirror faces towards the polarization reflecting layer.
7. An optical display system according to claim 2 or 3, characterized in that the optical display system further comprises:
the plane mirror is arranged on one side, far away from the polarization reflecting layer, of the dimming film layer and is connected with the dimming film layer.
8. The optical display system of claim 1, further comprising:
and the transparent substrate is arranged on one side of the polarization reflecting layer, which is far away from the dimming film layer, and is connected with the polarization reflecting layer.
9. The optical display system of claim 1, wherein an included angle α is formed between a surface of the polarization reflective layer away from the dimming film layer and a display surface of the display screen, and the included angle α satisfies:
40°≤α≤50°。
10. a display device comprising an optical display system according to any one of claims 1 to 9.
CN202010990211.XA 2020-09-18 2020-09-18 Optical display system and display device Pending CN111999898A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010990211.XA CN111999898A (en) 2020-09-18 2020-09-18 Optical display system and display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010990211.XA CN111999898A (en) 2020-09-18 2020-09-18 Optical display system and display device

Publications (1)

Publication Number Publication Date
CN111999898A true CN111999898A (en) 2020-11-27

Family

ID=73475502

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010990211.XA Pending CN111999898A (en) 2020-09-18 2020-09-18 Optical display system and display device

Country Status (1)

Country Link
CN (1) CN111999898A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113066399A (en) * 2021-03-26 2021-07-02 京东方科技集团股份有限公司 Display device
CN114911059A (en) * 2022-06-10 2022-08-16 京东方科技集团股份有限公司 Optical display device and head-mounted display equipment
CN115047630A (en) * 2022-06-30 2022-09-13 上海摩勤智能技术有限公司 AR optical system and AR device
CN115236858A (en) * 2022-06-21 2022-10-25 京东方科技集团股份有限公司 Optical system, display device, and control method
WO2023142568A1 (en) * 2022-01-30 2023-08-03 华为技术有限公司 Display apparatus and vehicle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111474715A (en) * 2020-04-23 2020-07-31 歌尔股份有限公司 Optical system and augmented reality device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111474715A (en) * 2020-04-23 2020-07-31 歌尔股份有限公司 Optical system and augmented reality device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113066399A (en) * 2021-03-26 2021-07-02 京东方科技集团股份有限公司 Display device
WO2023142568A1 (en) * 2022-01-30 2023-08-03 华为技术有限公司 Display apparatus and vehicle
CN114911059A (en) * 2022-06-10 2022-08-16 京东方科技集团股份有限公司 Optical display device and head-mounted display equipment
CN115236858A (en) * 2022-06-21 2022-10-25 京东方科技集团股份有限公司 Optical system, display device, and control method
CN115047630A (en) * 2022-06-30 2022-09-13 上海摩勤智能技术有限公司 AR optical system and AR device

Similar Documents

Publication Publication Date Title
CN111999898A (en) Optical display system and display device
US8917269B2 (en) Two dimensional displays, transparent displays, and three dimensional displays
US20230038591A1 (en) Near-eye display device
US11543565B2 (en) Display panel, display device and display method
WO2015122491A1 (en) Head-up display device
US20200201065A1 (en) Display device, optical system and virtual reality head-mounted display device
CN113253458B (en) Near-to-eye display device
JP2010243941A (en) Stereoscopic image display device and multi-view display device
WO2021196790A1 (en) Transparent display panel, display device, and glasses
WO2017148010A1 (en) Liquid crystal display and electronic apparatus
US11385502B1 (en) Near-eye display apparatus
US20230168423A1 (en) Near-eye display apparatus
JP2013088639A (en) Liquid crystal device, electronic apparatus and projection type display device
CN111158188B (en) Display panel and display device
JP2017106961A (en) Display device
JP2018180056A (en) Display device
CN212460200U (en) Near-to-eye display device
US10324335B2 (en) Display device
US20230236422A1 (en) Near-eye display device
CN110501835B (en) Display panel, driving method thereof and display device
CN110275309B (en) Polarizing microlens structure, display device and driving method thereof
CN209858911U (en) Display device
CN114911063B (en) Focal plane imaging system applied to virtual reality display
CN215494352U (en) Monocular augmented reality system, binocular augmented reality system and head-mounted display
CN109307960B (en) Transparent liquid crystal display panel

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination