CN109410769B - Transparent display panel, control method thereof and display device - Google Patents
Transparent display panel, control method thereof and display device Download PDFInfo
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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- 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
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Abstract
The embodiment of the invention provides a transparent display panel, a control method thereof and a display device, relates to the technical field of display, and can reduce the probability of diffraction in the transparent display process on the premise of ensuring the resolution ratio, thereby improving the ghost phenomenon caused by the diffraction. The transparent display panel includes: a pixel display region and a light-transmitting region; the display film layer is provided with a light-emitting device in the pixel display area, and the light-transmitting area is of a light-transmitting structure; the polaroid is positioned on the light emitting side of the display film layer and used for converting the emergent light of the light emitting device into polarized light; the light valve film layer is positioned on one side of the polarizer, which is far away from the display film layer, and is used for converting polarized light between polarized light in a first direction and polarized light in a second direction; the first birefringent film layer is positioned on one side of the light valve film layer, which is far away from the polaroid, and is used for enabling the polarized light in the first direction to be emitted in the pixel display area and the polarized light in the second direction to be emitted in the light transmitting area.
Description
Technical Field
The invention relates to the technical field of display, in particular to a transparent display panel, a control method thereof and a display device.
Background
The transparent display panel enables a user to see a scene behind the display panel through the display panel while displaying a picture. The current transparent display panel comprises a pixel display area for displaying pictures and a light-transmitting area positioned between the pixel display areas, the size of the light-transmitting area is smaller and smaller along with the improvement of resolution ratio, however, when the size of the light-transmitting area is too small, due to the arrangement mode of the pixel display area and the light-transmitting area periodic line, diffraction is formed when ambient light at the back of the display panel passes through the light-transmitting area in the transparent display process, and therefore a double image phenomenon is generated.
Disclosure of Invention
Embodiments of the present invention provide a transparent display panel, a control method thereof, and a display device, which can reduce the probability of diffraction in a transparent display process on the premise of ensuring resolution, thereby improving a ghost phenomenon caused by the diffraction.
In one aspect, an embodiment of the present invention provides a transparent display panel, including:
a pixel display region and a light-transmitting region;
the display film layer is provided with a light-emitting device in the pixel display area, and the light-transmitting area is of a light-transmitting structure;
the polaroid is positioned on the light emitting side of the display film layer and used for converting the emergent light of the light emitting device into polarized light;
the light valve film layer is positioned on one side of the polarizer, which is far away from the display film layer, and is used for converting the polarized light between the polarized light in the first direction and the polarized light in the second direction;
and the first birefringent film layer is positioned on one side of the light valve film layer, which is far away from the polaroid, and is used for enabling the polarized light in the first direction to be emitted in the pixel display area and the polarized light in the second direction to be emitted in the light transmitting area.
Optionally, the light valve film layer is not driven in the light transmissive region.
Optionally, the light valve film layer does not overlap with the transmissive region.
Optionally, the polarizer covers the light-transmitting region.
Optionally, the polarizer is not overlapped with the transparent region.
Optionally, the transparent display panel further includes:
a second birefringent film layer on a side of the display film layer away from the first birefringent film layer;
in the first birefringent film layer, the emission direction of the polarized light in the first direction is an optical axis symmetry direction, and the optical axis symmetry direction is perpendicular to the plane of the display film layer;
the optical axis of the second birefringent film layer and the optical axis of the first birefringent film layer are symmetrical relative to the optical axis symmetry direction.
Optionally, the transparent display panel includes:
a plurality of pixel display regions extending in a first direction and arranged in a second direction;
a plurality of the light-transmitting regions extending in the first direction and arranged in the second direction;
in the second direction, one light-transmitting area is arranged between any two adjacent pixel display areas, and one pixel display area is arranged between any two adjacent light-transmitting areas.
Optionally, in the second direction, a width of any of the light-transmitting regions is greater than a width of any of the pixel display regions.
Optionally, in the second direction, the widths of any of the pixel display regions are equal.
On the other hand, an embodiment of the present invention further provides a display device, including the transparent display panel.
On the other hand, an embodiment of the present invention further provides a method for controlling a transparent display panel, where the method is used for the transparent display panel, and the method includes:
the light valve film layer periodically switches the polarized light between the first direction polarized light and the second direction polarized light, each period comprising a first period of time and a second period of time;
during the first period, the light valve film layer makes the polarized light be the first direction polarized light;
and in the second time interval, the light valve film layer enables the polarized light to be the polarized light in the second direction.
Optionally, the duration of each said first period is equal to the duration of each said second period.
The transparent display panel, the control method thereof and the display device provided by the embodiment of the invention are provided with the pixel display area and the light transmission area, the light valve film layer is controlled to enable polarized light to be polarized light in a first direction in a first time interval by utilizing light rays of the light emitting device in a time-sharing multiplexing mode, the polarized light in the first direction is emitted out from the pixel display area in the first double refraction film layer, the polarized light in the second direction is emitted from the light transmission area in a second time interval, the light valve film layer is controlled to enable the polarized light to be polarized light in a second direction in the first double refraction film layer, and the polarized light in the second direction is emitted from the light transmission area in the first double refraction film layer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a partially enlarged schematic view of a transparent display panel according to an embodiment of the invention;
FIG. 2 is a partially enlarged schematic view of another transparent display panel according to an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view along AA' of FIG. 1;
FIG. 4 is a schematic view of another cross-sectional structure along direction AA' in FIG. 1;
FIG. 5 is a schematic view of another cross-sectional structure along direction AA' in FIG. 1;
FIG. 6 is a schematic view of another cross-sectional structure along direction AA' in FIG. 1;
FIG. 7 is a schematic view of another cross-sectional structure along direction AA' in FIG. 1;
FIG. 8 is a schematic view of another cross-sectional structure along direction AA' in FIG. 1;
FIG. 9 is a schematic view of a first birefringent film layer according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a display device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
As shown in fig. 1, fig. 2 and fig. 3, fig. 1 is a partially enlarged schematic view of a transparent display panel in an embodiment of the present invention, fig. 2 is a partially enlarged schematic view of another transparent display panel in an embodiment of the present invention, fig. 3 is a schematic view of a cross-sectional structure along direction AA' in fig. 1, and an embodiment of the present invention provides a transparent display panel, including: a pixel display region 1 and a light-transmitting region 2; the display film layer 3 is provided with a light-emitting device 31 in the pixel display area 1, and the light-transmitting area 2 is of a light-transmitting structure; a polarizer 4 on the light exit side of the display film layer 3 for converting the exit light of the light emitting device 31 into polarized light; a light valve film layer 5 located on a side of the polarizer 4 away from the display film layer 3, where the light valve film layer 5 is configured to convert polarized light between a polarized light a in a first direction and a polarized light b in a second direction, a solid arrow labeled a in fig. 1 is used to indicate a propagation path of the polarized light a in the first direction, and a dotted arrow labeled b is used to indicate a propagation path of the polarized light b in the second direction; the first birefringent film 61 is disposed on a side of the light valve film 5 away from the polarizer 4, and the first birefringent film 61 is configured to enable the first-direction polarized light a to exit in the pixel display area 1 and enable the second-direction polarized light b to exit in the light-transmitting area 2.
The embodiment of the present invention further provides a method for controlling a transparent display panel, which is used for the transparent display panel, and the method includes:
the light valve film layer 5 periodically converts the polarized light between a first direction polarized light a and a second direction polarized light b, each period including a first period and a second period;
in a first period, the light valve film layer 5 makes the polarized light a polarized light in a first direction;
during the second period, the light valve film layer 5 polarizes the light into the second-direction polarized light b.
Specifically, the light emitting device 31 generates light for displaying a pattern, the light is converted into linearly polarized light with a specific polarization direction at the polarizer 4, the linearly polarized light is a first direction polarized light a at the light valve layer 5 in a first period, for example, the first direction polarized light a is the same as the polarization direction of the polarizer 4, that is, in the first period, the light valve layer 5 does not change the polarization direction, when the first direction polarized light a reaches the first birefringent layer 61, the first direction polarized light a is transmitted and emitted in the first birefringent layer 61 in the original direction as ordinary light, that is, the first direction polarized light a is emitted in the pixel display area 1, at this time, the display of pixels is realized in the pixel display area 1, and the image is not displayed in the transparent area 2, but the ambient light from the back is displayed; in the second period, the linearly polarized light from the polarizer 4 is the second direction polarized light b in the light valve layer 5, for example, the polarization direction of the linearly polarized light is changed by the control of the light valve, so that the first direction polarized light a is converted into the second direction polarized light b, when the second direction polarized light b reaches the first birefringent film 61, it is refracted and emitted from the first birefringent film 61 in the light transmission area 2 as the extraordinary rays, so that, in the second period, the light of the light emitting device 31 is shifted, and the display of the pixel is realized in the light transmission area 2, for example, the broken line frame in fig. 1 and fig. 2 represents the pixel position displayed in the second period, so that, when the refresh frequency is fast, the required displayed picture can be displayed in the pixel display area 1 and the light transmission area 2 together, for example, each period is one frame, in each odd frame, pixels are displayed in the pixel display area 1, and in each even frame, pixels are displayed in the light transmission area 2, so that human eyes can feel that the pixels are arranged in the pixel display area 1 and the light transmission area 2, namely, the resolution is improved.
The transparent display panel and the control method thereof in the embodiment of the invention are provided with a pixel display area and a light transmission area, the light of a light emitting device is utilized in a time-sharing multiplexing mode, a light valve film layer is controlled to enable polarized light to be polarized light in a first direction in a first time interval, the polarized light in the first direction is emitted out from the pixel display area in a first double refraction film layer, the polarized light in the second direction is emitted from the light transmission area in a second time interval, the size of the light transmission area can be set to be larger on the basis of improving the resolution, the probability of diffraction formed by ambient light on the back of the display panel can be reduced, and therefore the ghost phenomenon caused by the diffraction can be improved.
Alternatively, in the above-described transparent display panel control method, the duration of each first period is equal to the duration of each second period, so that the display time of the pixels in the pixel display region 1 and the light transmission region 2 can be made the same to improve the display effect.
Optionally, the light valve film layer 5 is not driven in the transmissive region 2.
Specifically, the light valve film layer 5 is used for converting light from the light emitting device 31 in the pixel display area 1 between the first direction polarized light a and the second direction polarized light b, further refracting the second direction polarized light b in the first birefringent film layer 61, and emitting the light in the light transmission area 2, and for the light transmission area 2, only the ambient light on the back of the display panel needs to be directly emitted to realize transparent display, so that if the light transmission area 2 is provided with the light valve film layer 5, the light valve film layer 5 can be controlled to be not driven in the light transmission area 2.
Alternatively, as shown in fig. 4, fig. 4 is another schematic cross-sectional structure view along direction AA' in fig. 1, the light valve film layer 5 is not overlapped with the light transmitting region 2, and the light transmittance of the light transmitting region 2 can be improved by removing the light valve film layer 5 in the light transmitting region 2.
Alternatively, as shown in fig. 3 and 4, the polarizer 4 covers the transparent area 2, that is, in the transparent area 2, the ambient light at the back of the display panel is filtered to be polarized in the first direction at the polarizer 4, and in the case of removing the light valve film 5 in the transparent area 2 or making the light valve film 5 in the transparent area 2 undriven, the polarized light in the first direction in the transparent area 2 directly passes through the first birefringent film 61 as the ordinary light without the deviation of the emitting position, and although the brightness of the ambient light is lost due to the polarizer 4, the ambient light in the transparent area 2 does not generate the double image of the two beams due to the action of the light valve film 5 and the first birefringent film 61.
Alternatively, as shown in fig. 5 and 6, fig. 5 is another cross-sectional structure diagram of the direction AA 'in fig. 1, fig. 6 is another cross-sectional structure diagram of the direction AA' in fig. 1, the polarizer 4 and the light-transmitting region 2 do not overlap, that is, in the light-transmitting region 2, ambient light on the back of the display panel directly propagates to the first birefringent film layer 61, and includes light with various polarization directions, wherein the polarized light with the first direction directly passes through the first birefringent film layer 61, and the polarized light with the second direction is refracted and then emitted at other positions, compared with the structures shown in fig. 3 and 4, the ambient light is less lost, that is, the display brightness is greater, but if the polarized light with the two directions in the ambient light is emitted at positions that are farther apart, a ghost of the ambient light is easily perceived by human eyes.
Optionally, as shown in fig. 7 and fig. 8, fig. 7 is a schematic view of another cross-sectional structure along direction AA 'in fig. 1, and fig. 8 is a schematic view of another cross-sectional structure along direction AA' in fig. 1, where the transparent display panel further includes: a second birefringent film layer 62 on the side of the display film layer 3 away from the first birefringent film layer 61; in the first birefringent film layer 61, the emitting direction of the first-direction polarized light a is an optical axis symmetry direction, and the optical axis symmetry direction is perpendicular to the plane of the display film layer 3; the optical axis a2 of the second birefringent film layer 62 and the optical axis a1 of the first birefringent film layer 61 are symmetrical with respect to the optical axis.
Specifically, when the optical axis a2 of the second birefringent film layer 62 and the optical axis a1 of the first birefringent film layer 61 have the above-mentioned symmetrical optical axis relationship, when the ambient light enters from the display panel in the light-transmitting region 2, the ambient light is first decomposed into the first direction polarized light (indicated by the solid line arrow) and the second direction polarized light (indicated by the dotted line arrow), wherein the first direction polarized light is not refracted and directly exits, the second direction polarized light exits after being refracted in the second birefringent film layer 62, and then exits after being refracted symmetrically in the first birefringent film layer 61, because of the symmetrical optical axis relationship between the first birefringent film layer 61 and the second birefringent film layer 62, the ambient light entering at the same position has symmetrical transmission paths in the first birefringent film layer 61 and the second birefringent film layer 62, and finally the first direction polarized light and the second direction polarized light exit at the same position, on the one hand, the loss of brightness is reduced and on the other hand no ghosting of ambient light is caused. Note that the first birefringent film layer 61 and the second birefringent film layer 62 have equal thicknesses.
Alternatively, as shown in fig. 1 and 2, the transparent display panel includes: a plurality of pixel display regions 1 extending in the first direction h1 and arranged in the second direction h2, only two pixel display regions 1 being schematically illustrated in fig. 1; a plurality of light-transmitting regions 2 extending in the first direction h1 and arranged in the second direction h2, only one light-transmitting region 2 being illustrated in fig. 1; in the second direction h2, one light transmission region 2 is disposed between any adjacent two of the pixel display regions 1, and one pixel display region 1 is disposed between any adjacent two of the light transmission regions 2. In this way, the pixels displayed in the first period and the pixels displayed in the second period can be uniformly distributed to improve the display effect. In addition, in fig. 1, each pixel display area 1 corresponds to three columns of sub-pixels, and in fig. 2, each pixel display area 1 corresponds to one column of sub-pixels.
Alternatively, in the second direction h2, the width of any light-transmitting area 2 is greater than the width of any pixel display area 1, so that it is ensured that the pixel corresponding to the pixel display area 1 can be sufficiently shifted and displayed in the light-transmitting area 2 in the second period, and that the size of the light-transmitting area 2 is large, and diffraction of ambient light due to the small size of the light-transmitting area 2 is reduced.
Optionally, in the second direction h2, the width of any pixel display area 1 is equal, further ensuring uniform distribution of pixels to improve the display effect.
It should be noted that the specific structure of the first birefringent film layer 61 needs to be set according to actual conditions, and the principle is that in the first period, the pixels displayed by the light emitting devices 31 in the pixel display area 1 emit light directly for display, and in the second period, the pixels displayed by the light emitting devices 31 in the pixel display area 1 emit light in the adjacent light transmitting areas 2 exactly for display. As shown in fig. 9, fig. 9 is a schematic structural diagram of a first birefringent film layer according to an embodiment of the present invention, in the first birefringent film layer 61, an angle between a first-direction polarized light a and a second-direction polarized light b is a birefringent angle
The distance between the exit points of the first-direction polarized light a and the second-direction polarized light b is s, the thickness of the first birefringent film layer 61 is d, and the parameters in the first birefringent film layer 61 need to satisfy the following formula:
wherein θ is the optical axis angle of the first birefringent film layer 61, and noIs the refractive index of the light polarized in the first direction a, neIs the refractive index of the light polarized in the second direction b.
In addition, in the embodiment of the present invention, although the first direction polarized light and the second direction polarized light in the ambient light exit from different positions in the light-transmitting area 2, whether the light is perceived as a ghost by the human eye is also related to the distance from the human eye to the surface of the first birefringent film layer 61, for example, as shown in fig. 9, if the distance from the human eye to the surface of the first birefringent film layer 61 is short and the angle e between the two exit points on the surface of the first birefringent film layer 61 and the light of the human eye is greater than 1/60 °, the light is perceived as a ghost of the ambient light, so the structure shown in fig. 3, 4, 7 or 8 needs to be adopted; if the distance from the human eye to the surface of the first birefringent film layer 61 is relatively long, and the angle e between the two exit points on the surface of the first birefringent film layer 61 and the human eye is smaller than 1/60 °, no ghost of the ambient light is sensed, so the structure shown in fig. 5 and fig. 6 can be directly adopted.
As shown in fig. 10, fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention, and the embodiment of the present invention further provides a display device including the transparent display panel 100.
Specifically, the specific structure of the display panel 100 is the same as that of the above embodiments, and is not described herein again. The display device can be any electronic equipment with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic paper book or a television, and in addition, the transparent display panel 100 is arranged in the display device, so that the display device is more suitable for specific scenes and equipment, such as a show window display device, on one hand, a user can conveniently see objects in the show window through the display device, and on the other hand, the user can conveniently see information related to the objects in the show window directly on the display device; for example, the vehicle-mounted display device may be disposed at the windshield, on one hand, to facilitate the user to see the road surface condition through the device, and on the other hand, to facilitate the user to directly see the driving-related indication information, such as navigation indication information or vehicle speed information, on the device.
The display device in the embodiment of the invention is provided with the pixel display area and the light transmission area, the light of the light emitting device is utilized in a time-sharing multiplexing mode, the light valve film layer is controlled to enable the polarized light to be the polarized light in the first direction in the first double refraction film layer, the polarized light in the first direction is emitted out from the pixel display area, the light valve film layer is controlled to enable the polarized light to be the polarized light in the second direction in the second time period, and the polarized light in the second direction is emitted out from the light transmission area in the first double refraction film layer.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A transparent display panel, comprising:
a pixel display region and a light-transmitting region;
the display film layer is provided with a light-emitting device in the pixel display area, and the light-transmitting area is of a light-transmitting structure;
the polaroid is positioned on the light emitting side of the display film layer and used for converting the emergent light of the light emitting device into polarized light;
the light valve film layer is positioned on one side of the polarizer, which is far away from the display film layer, and is used for converting the polarized light between the polarized light in the first direction and the polarized light in the second direction;
the first birefringent film layer is positioned on one side of the light valve film layer, which is far away from the polarizer, and is used for enabling the polarized light in the first direction to be emitted in the pixel display area and the polarized light in the second direction to be emitted in the light transmitting area;
the light valve film layer is not driven in the light-transmitting area, or the light valve film layer is not overlapped with the light-transmitting area.
2. The transparent display panel according to claim 1,
the polaroid covers the light transmission area.
3. The transparent display panel according to claim 1,
the polaroid is not overlapped with the light transmission area.
4. The transparent display panel according to claim 3, further comprising:
a second birefringent film layer on a side of the display film layer away from the first birefringent film layer;
in the first birefringent film layer, the emission direction of the polarized light in the first direction is an optical axis symmetry direction, and the optical axis symmetry direction is perpendicular to the plane of the display film layer;
the optical axis of the second birefringent film layer and the optical axis of the first birefringent film layer are symmetrical relative to the optical axis symmetry direction.
5. The transparent display panel according to claim 1, comprising:
a plurality of pixel display regions extending in a first direction and arranged in a second direction;
a plurality of the light-transmitting regions extending in the first direction and arranged in the second direction;
in the second direction, one light-transmitting area is arranged between any two adjacent pixel display areas, and one pixel display area is arranged between any two adjacent light-transmitting areas.
6. The transparent display panel according to claim 5,
in the second direction, the width of any of the light-transmitting regions is greater than the width of any of the pixel display regions.
7. The transparent display panel according to claim 5,
in the second direction, the widths of any of the pixel display regions are equal.
8. A display device characterized by comprising the transparent display panel according to any one of claims 1 to 7.
9. A transparent display panel control method for the transparent display panel according to any one of claims 1 to 7, the method comprising:
the light valve film layer periodically switches the polarized light between the first direction polarized light and the second direction polarized light, each period comprising a first period of time and a second period of time;
during the first period, the light valve film layer makes the polarized light be the first direction polarized light;
and in the second time interval, the light valve film layer enables the polarized light to be the polarized light in the second direction.
10. The transparent display panel control method according to claim 9,
the duration of each of the first time periods is equal to the duration of each of the second time periods.
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| CN110133877B (en) * | 2019-06-28 | 2022-06-17 | 上海天马微电子有限公司 | Display panel and display device |
| CN112581874B (en) * | 2019-09-29 | 2022-09-23 | 北京小米移动软件有限公司 | Display panel, display device, display control method and device and terminal equipment |
| CN111933676B (en) * | 2020-08-18 | 2023-09-19 | 京东方科技集团股份有限公司 | Display panel, manufacturing method thereof and display device |
| CN113093412B (en) * | 2021-04-12 | 2023-11-03 | 武汉天马微电子有限公司 | Display panel, control method and display device |
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