CN111427114B - Image transfer module, display device and control method - Google Patents
Image transfer module, display device and control method Download PDFInfo
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- CN111427114B CN111427114B CN202010365515.7A CN202010365515A CN111427114B CN 111427114 B CN111427114 B CN 111427114B CN 202010365515 A CN202010365515 A CN 202010365515A CN 111427114 B CN111427114 B CN 111427114B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0076—Stacked arrangements of multiple light guides of the same or different cross-sectional area
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
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- G—PHYSICS
- 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
Abstract
The invention discloses an image transfer module, a display device and a control method. The image transfer module includes: the light guide plate is provided with a first area and a second area, a plurality of gratings are arranged in the light guide plate, and at least one grating is arranged in each of the first area and the second area; the positive lens is arranged on one side of the light guide plate and is positioned in the second area; the negative lenses are arranged on one side, far away from the positive lenses, of the light guide plate and located in the first area and the second area, the negative lenses and the gratings are arranged in a one-to-one correspondence mode, and the gratings in the second area can transfer light rays incident to the gratings through the positive lenses to the gratings in the first area under the first state and emit the light rays through the negative lenses in the first area; the grating in the second area can directly emit the light rays which are incident to the grating through the positive lens in the second state through the negative lens in the second area. Therefore, the image transfer module can realize the transfer display of the image, so that the black lines in the display picture of the spliced screen are narrowed, and even the effect of zero-splicing display is achieved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to an image transfer module, a display device, and a control method.
Background
With the development of display technology, large-sized tiled screens gradually become hot spots. At present, the spliced screen mainly comprises an LCD spliced screen, an LED spliced screen and an OLED spliced screen, and can be displayed independently or randomly combined by a single screen and can be spliced into an ultra-large screen for display.
However, the current tiled screens remain to be improved.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
as is well known to those skilled in the art, a tiled screen is formed by splicing a plurality of display units, and a seam is formed between two adjacent display units. The inventor finds that, with the development and progress of display technology, although the width of the seams in the spliced screen is being reduced (currently reduced to about 1 mm), the seams in the spliced screen still cannot be eliminated, and the visual effect is always defective: when the splicing screen displays, the area where the splicing seam is located is black, namely, a plurality of wider black lines exist on the display picture, and the continuity and the integrity of the display picture are influenced.
The present invention aims to alleviate or solve at least to some extent at least one of the above mentioned problems.
In one aspect of the invention, an image transfer module is presented. The image transfer module includes: the light guide plate is provided with a first area and a second area, a plurality of gratings are arranged in the light guide plate, and at least one grating is arranged in each of the first area and the second area; a positive lens disposed at one side of the light guide plate and located in the second region; the negative lens is arranged on one side, far away from the positive lens, of the light guide plate and located in the first area and the second area, the negative lens and the gratings are arranged in a one-to-one correspondence mode, and the gratings in the second area can transfer light rays entering the gratings through the positive lens to the gratings in the first area under a first state and emit the light rays through the negative lens in the first area; the grating in the second region may directly emit, in the second state, light incident on the grating through the positive lens through the negative lens in the second region. Therefore, the image transfer module can realize the transfer display of the image, and the spliced screen using the image transfer module can transfer the image presented by the pixel of the display area close to one side of the spliced area to the spliced area for displaying in the first state, and can still display the image presented by the pixel of the display area close to one side of the spliced area in the second state, and the divided images can be alternately displayed in odd frames and even frames, so that the black line in the display screen becomes narrow visually, and even the spliced display effect (namely the black line display effect) is zero and the image distortion is avoided.
According to an embodiment of the present invention, the grating is a bragg grating, the bragg grating includes a polymer dispersed liquid crystal, the bragg grating includes a polymer layer and a liquid crystal layer that are alternately stacked in sequence in a direction in which the bragg grating extends, and the polymer dispersed liquid crystal is configured to make an exit angle of light emitted through the bragg grating larger than a critical angle at which total reflection occurs in the light guide plate in the first state. Therefore, the opening and closing of the Bragg grating can be controlled by applying voltage to the Bragg grating, and light rays can be totally reflected in the light guide plate after being emitted by the Bragg grating, so that the brightness of an image displayed in the splicing region is consistent with that of the image displayed in the display region, and the brightness of each region of a display picture is guaranteed to be consistent.
According to an embodiment of the present invention, the light guide plate includes a first light guide plate and a second light guide plate which are stacked, the grating is disposed between the first light guide plate and the second light guide plate, the light guide plate has two first regions and two second regions, the two first regions are disposed adjacent to each other, the two second regions are respectively located on both sides of the first region, and one grating is disposed in each of the first region and the second region. Therefore, partial images in the display areas on the two sides of the seam area can be transferred to the seam area to be displayed in the first state, images in the display areas on the two sides of the seam area are still displayed in the display areas in the second state, and the divided images are alternately displayed in odd frames and even frames through the alternation of the first state and the second state, so that the effects of narrowing black lines in a display picture and even displaying zero seam are achieved.
In another aspect of the present invention, a display device is provided. The display device includes: the display panel comprises a plurality of display areas, and a splicing area is arranged between every two adjacent display areas; the image transfer module is located on the light emitting side of the display panel and covers the splicing area and the part close to the splicing area, the first area is in orthographic projection on the display panel and the splicing area is in orthographic projection coincidence on the display panel, and the positive lens faces towards the display panel. Therefore, the black lines in the display screen of the display device are narrowed, and even the display device can achieve zero splicing and display without image distortion.
According to the embodiment of the invention, the width of the image transfer module is 2 times of the width of the splicing region. Therefore, the image transferred from the display area to the splicing area can completely cover the splicing area, the zero splicing display effect is achieved, waste caused by overlarge width of the image transfer module can be avoided, the area of a low-frequency display area is prevented from being increased, and the display picture has high display quality.
According to the embodiment of the invention, the part of the display area covered by the image transfer module is symmetrical along the central axis of the splicing area. Therefore, partial images in the display areas on the two sides of the splicing area can be transferred to the splicing area to be displayed in the first state, images in the display areas on the two sides of the splicing area are still displayed in the display areas in the second state, the split images are alternately displayed in odd frames and even frames through the alternation of the first state and the second state, the effects that black lines in a display picture are narrowed, even the splicing area is zero are achieved, and the first area and the second area can adopt gratings with the same size, positive lenses with the same size and negative lenses with the same size.
According to an embodiment of the present invention, the focal points of the positive lens and the negative lens are both located on the display panel. Thus, a clear image can be presented.
In another aspect of the present invention, the present invention provides a method of controlling the display panel described above. The method comprises the following steps: in the first state, the grating is opened, and the light rays incident to the grating through the positive lens are transferred to the grating in the second area and emitted out through the negative lens in the first area by the grating in the second area; in the second state, the grating is closed, and the light rays incident to the grating through the positive lens in the second area are directly emitted out through the negative lens in the second area by the grating in the second area. Therefore, when the raster is opened, the image presented by the pixel at the side of the display area close to the splicing area can be transferred to the splicing area for displaying, when the raster is closed, the image presented by the pixel at the side of the display area close to the splicing area is still displayed in the display area, and the divided images can be alternately displayed in odd frames and even frames, so that the effects of narrowing black lines in the display picture and even zero splicing display are achieved.
According to the embodiment of the invention, the switching frequency of the grating is consistent with the driving frequency of the display panel, and the driving frequency of the display panel is at least 120Hz. Therefore, a normal and clear picture can be presented, when the driving frequency of the display panel is 120Hz, a complete image of 60 frames per second can be observed by human eyes in the splicing region, so that the effect of zero splicing display is achieved, and the display picture can be ensured to have higher fluency.
According to an embodiment of the present invention, by controlling the voltage applied to the grating, or by controlling the constituent material of the grating, the exit angle of the light emitted through the grating is made larger than the critical angle at which total reflection occurs in the light guide plate. Therefore, the light emitted by the Bragg grating can be totally reflected in the light guide plate by a simple mode, so that the brightness of the image displayed in the splicing region is consistent with that of the image displayed in the display region, and the brightness of each region of the display picture is guaranteed to be consistent.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic structural diagram of an image transfer module according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an image transfer module according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 4 is a schematic view showing a partial structure of a display device according to an embodiment of the present invention;
fig. 5 is a schematic view showing a partial structure of a display device according to another embodiment of the present invention;
FIG. 6 is a schematic diagram of an optical path of a display device in a first state according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an optical path of a display device in a second state according to an embodiment of the present invention;
FIG. 8 is a schematic diagram showing an optical path of a display device according to another embodiment of the present invention in a first state;
fig. 9 shows a schematic diagram of an optical path of a display device according to another embodiment of the present invention in a second state;
fig. 10 is a schematic diagram illustrating a display effect of a display device according to an embodiment of the present invention.
Description of the reference numerals:
100: a light guide plate; 110: a first light guide plate; 120: a second light guide plate; 200: a grating; 300: a positive lens; 400: a negative lens; 10: a first region; 20: a second region; 1000: an image transfer module; 2000: a display panel; 1/2/3/4: a display area; 5: a seam splicing area; 6: the image transfer module is used for orthographically projecting the area on the display panel.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In one aspect of the invention, an image transfer module is presented. According to an embodiment of the present invention, referring to fig. 1, the image transfer module 1000 includes: the light guide plate comprises a light guide plate 100, a grating 200, a positive lens 300 and a negative lens 400, wherein the light guide plate 100 is provided with a first area 10 and a second area 20, the light guide plate 100 is internally provided with a plurality of gratings 200, the first area 10 and the second area 20 are respectively provided with at least one grating 200, the positive lens 300 is arranged on one side of the light guide plate 100 and is positioned in the second area 20, the negative lens 400 is arranged on one side of the light guide plate 100 away from the positive lens 300 and is positioned in the first area 10 and the second area 20, the negative lenses 400 are arranged in one-to-one correspondence with the gratings 200, the grating 200 in the second area 20 can transfer light entering the grating 200 through the positive lens 300 to the grating 200 in a first state, transfer the light entering the grating 200 through the positive lens 300 to the grating 200 in the first area 10 and emit the light through the negative lens 400 in the first area 10, and the grating 200 in the second area 20 can directly emit the light entering the grating 200 through the negative lens 400 in the second area 20. Therefore, the image transfer module can realize the transfer display of the image, and by applying the spliced screen of the image transfer module, in the first state, the image presented by the pixel of the display area close to one side of the spliced area can be transferred to the spliced area for displaying, in the second state, the image presented by the pixel of the display area close to one side of the spliced area is still displayed in the display area, and the divided images can be alternately displayed in odd frames and even frames, so that the effects of narrowing black lines in the display picture and even displaying zero spliced seam are achieved.
According to the embodiment of the present invention, when the image transfer module is applied to the display device, the image transfer module covers the patchwork area and a part of the display area close to the patchwork area of the display panel, i.e. the first area 10 corresponds to the patchwork area, and the second area 20 corresponds to a part of the display area close to the patchwork area, the raster 200 in the second area 20 can transfer the light incident to the raster 200 through the positive lens 300 to the raster 200 in the first area 10 in the first state and emit the light through the negative lens 400 in the first area 10, so that in the first state, the image transfer module can transfer the image on the side of the display area close to the patchwork area for display, and the raster 200 in the second state can directly emit the light incident to the raster 200 through the positive lens 300 through the negative lens 400 in the second area 20, and thus, in the second light state, the raster does not change the propagation path of the display area, the image on the side of the display area close to the patchwork area is still in the display area, the display area is capable of performing the display effect of alternating display of narrowing the black frame and improving the display effect of the display screen without the black frame (no display) in the second state, and the display screen without the display effect of the black frame being changed, and without the black frame being changed in the display screen.
The following describes the respective structures of the image transfer module in detail according to specific embodiments of the present invention:
according to an embodiment of the present invention, referring to fig. 1, the light guide plate 100 may have a first area 10 and a second area 20, the first area 10 corresponding to a seam region of a display panel and the second area 20 corresponding to a portion of a display region on one side of the seam region when the image transfer module is applied to a display device. Therefore, partial images of the display area on one side of the splicing seam area can be transferred to the splicing seam area in the first state, and images of the display area corresponding to the second area are still displayed in the display area in the second state, so that the images are alternately displayed in odd frames and even frames, and the display effect of narrowing black lines in a display picture and even zero splicing seams is achieved. It should be noted that, since the image of the second region is transferred to the first region for display in the first state, in order to achieve the zero-seam display effect, the size of the second region is at least equal to the size of the first region, so as to ensure that the image transferred from the second region to the first region in the first state can completely cover the first region, and preferably, the size of the second region is equal to the size of the first region.
According to other embodiments of the present invention, referring to fig. 2, the light guide plate 100 may have two first regions 10 and two second regions 20, the two first regions 10 are adjacently disposed, the two second regions 20 are respectively located at two sides of the first regions 10, and each of the first regions 10 and the second regions 20 has one grating 200 therein. Therefore, partial images in the display areas positioned at two sides of the splicing area can be transferred to the splicing area for display in the first state, and images of the display areas respectively corresponding to the two second areas are still displayed in the display areas in the second state, so that the images are alternately displayed in odd frames and even frames, and the effect of narrowing black lines in a display picture and even displaying zero splicing is achieved. It should be noted that, in this embodiment, in order to achieve the zero-patchwork display effect, the size of the second region is at least the same as the size of the first region close to the second region, that is, the size of the second region on the left side is at least the same as the size of the first region on the left side, and the size of the second region on the right side is at least the same as the size of the first region on the right side, so as to ensure that the image transferred from the second region on the left side to the first region on the left side can completely cover the first region on the left side, and ensure that the image transferred from the second region on the right side to the first region on the right side can completely cover the first region on the right side, and the sizes of the two first regions are equal, and the sizes of the two second regions are equal at this time, so that the symmetric distribution of the first regions and the symmetric distribution of the second regions can be realized, and the gratings in the first and second regions can adopt the same size, the positive lens can adopt the same size, and the negative lens can adopt the same size.
According to an embodiment of the present invention, referring to fig. 2, the light guide plate 100 may include a first light guide plate 110 and a second light guide plate 120 that are disposed in a stack, with the grating 200 disposed between the first light guide plate 110 and the second light guide plate 120. Therefore, the grating can be fixed inside the light guide plate by the first light guide plate and the second light guide plate, and the structure is favorable for total reflection of light rays in the light guide plate. The fixing method of the grating and the first and second light guide plates is not particularly limited, and for example, the grating may be assembled with the first and second light guide plates by a bonding method.
According to an embodiment of the present invention, the light guide plate 100 is formed of a transparent material to achieve a light guiding effect. Specific constituent materials of the light guide plate are not particularly limited, and for example, according to an embodiment of the present invention, the material constituting the light guide plate may include glass or Polymethylmethacrylate (PMMA).
According to an embodiment of the present invention, the grating 200 may be a bragg grating, and the bragg grating may include a Polymer Dispersed Liquid Crystal (PDLC) including a polymer layer and a liquid crystal layer alternately stacked in sequence in a direction in which the bragg grating extends. Thus, the polymer layer and the liquid crystal layer may constitute a grating, and the grating may be turned on and off by applying a voltage signal. According to the embodiment of the invention, by applying voltage to the Bragg grating, liquid crystal molecules can deflect, so that the refractive index of the liquid crystal can be adjusted, when the refractive index of the liquid crystal is not equal to that of the polymer, the Bragg grating is in an open state, and when the refractive index of the liquid crystal is equal to that of the polymer, the Bragg grating is in a closed state.
According to the embodiment of the invention, when the grating 200 is opened, the grating 200 has a diffraction effect, light entering the grating 200 can deflect under the diffraction effect, so that the light in the second region can be transferred into the first region and emitted from the first region, when the grating 200 is closed, the grating 200 does not have the diffraction effect, the propagation direction of the light entering the grating 200 cannot be changed, namely the light is directly emitted from the grating 200, so that the light in the second region is still emitted from the second region, therefore, by controlling the opening and closing of the grating, the alternate display of the divided images in the odd frames and the even frames can be realized, and due to the human visual residual effect, when the size of the second region is consistent with that of the first region, the human eyes can finally observe the complete image, namely, no black line exists in the display frame, and the effect of zero-splicing display is achieved.
According to the embodiment of the invention, the bragg grating can be a structure in which after a photosensitive prepolymer and liquid crystal are uniformly mixed, the mixture is exposed under the interference area of two coherent laser beams, the interference enhancement area is polymerized, the interference attenuation area is not polymerized, and simultaneously the two materials are mutually diffused, and finally a polymer layer and a liquid crystal layer are periodically arranged, so that the bragg grating has a periodically distributed refractive index to form a diffraction grating, and the period of the bragg grating formed under the interference action is as follows: d = λ/(2 · n · θ), where λ is the wavelength of the laser beam, n is the average refractive index of the mixture of polymer and liquid crystal, and 2 θ is the angle between the two coherent light beams.
According to the embodiment of the invention, when the polymer dispersed liquid crystal is in the first state (i.e. the grating is opened), the exit angle of the light emitted through the bragg grating is larger than the critical angle of total reflection in the light guide plate. Therefore, after the light is emitted by the Bragg grating, the light can be totally reflected in the light guide plate, so that the brightness of the image displayed in the first area (namely the splicing seam area) is consistent with that of the image displayed in the second area (namely the display area), and the consistency of the display brightness of all areas of the display picture is ensured. That is, the total reflection of the light emitted from the light guide plate by the light guide plate depends on the material of the light guide plate, and the voltage applied to the light guide plate. The specific arrangement of the above factors is not particularly limited, and those skilled in the art can adjust the above factors according to actual conditions, as long as the exit angle of the light emitted from the grating is larger than the critical angle of total reflection in the light guide plate, so as to cause total reflection.
According to the embodiment of the invention, the positive lens 300 can convert the light entering the positive lens 300 into parallel light, i.e. the light entering the grating 200 is guaranteed to be parallel light. Therefore, normal display of the picture can be ensured, and a clear image can be obtained.
According to the embodiment of the invention, the negative lens 400 can diverge and image the light emitted from the grating 200, so that the image can be observed by human eyes.
In another aspect of the present invention, a display device is provided. According to an embodiment of the present invention, referring to fig. 3, the display device includes: the display panel 2000 and the image transfer module 1000, the image transfer module 1000 is the image transfer module described above, the display panel 2000 includes a plurality of display regions (e.g., the display region 1, the display region 2, the display region 3, and the display region 4 shown in fig. 3), a seam region 5 is provided between two adjacent display regions, the image transfer module 1000 is located on the light emitting side of the display panel 2000 and covers the seam region 5 and a portion of the display region close to the seam region 5, an orthographic projection of the first region 10 on the display panel 2000 coincides with an orthographic projection of the seam region 5 on the display panel 2000 (refer to fig. 4 and 5), and the positive lens 300 is disposed toward the display panel 2000. Therefore, the black lines in the display picture of the display device are narrowed, even the display with zero splicing seam and no image distortion can be achieved, and the continuity and the integrity of the picture display are improved.
According to an embodiment of the present invention, the width of the image transfer module 1000 may be 2 times the width of the patchwork area 5. That is, the width of the portion of the display area covered by the image transfer module is equal to the width of the seam region, and the first region of the image transfer module corresponds to the seam region and the second region corresponds to the portion of the display area on the side close to the seam region. Therefore, in the first state, the image transferred to the splicing region from the display region can completely cover the splicing region, the zero splicing display effect is achieved, waste caused by the fact that the width of the image transfer module is too large can be avoided, the area of a low-frequency display region is prevented from being increased, and the display picture has high display quality. The relationship between the size of the covered portion (i.e. the portion corresponding to the second region) of the display region and the size of the patchwork region (i.e. the portion corresponding to the first region) is described in detail above, and will not be described in detail herein. It should be noted that the width of the image transfer module may also be more than 2 times the width of the seam region, in this case, parameters of optical elements (such as a grating, a positive lens, and a negative lens) in the image transfer module need to be adjusted so that an image displayed by the covered portion of the display region can be completely transferred to the seam region and completely cover the seam region, and in this case, the width of the image transfer module is increased and the area of the low-frequency display region is increased, so the width of the image transfer module is preferably 2 times the width of the seam region, and the display apparatus is described later with the width of the image transfer module being 2 times the width of the seam region.
It should be noted that, since the image on the side of the display area close to the patchwork area is divided into odd frames and even frames for alternate display, the display frequency of the area of the display panel covered by the image transfer module is lower than the display frequency of the other part of the display area, and therefore, the "low frequency display area" herein refers to the area of the display panel covered by the image transfer module.
It should be noted that, referring to fig. 3, only one image transfer module is provided at the position where the two seam regions intersect, for example, the image transfer module between the display region 1 and the display region 2, the module integrated with the image transfer module between the display region 3 and the display region 4, the image transfer module between the display region 1 and the display region 3, and the image transfer module between the display region 2 and the display region 4 are two independent modules.
According to the embodiment of the invention, the image transfer module can be attached to the display panel, and the shape of the image transfer module is consistent with that of the seam region, so that the image of the display region is transferred to the seam region for display.
According to an embodiment of the present invention, referring to fig. 4, the image transfer module has a first region and a second region, the orthographic projection of the first region on the display panel coincides with the orthographic projection of the seam region on the display panel, and the portion of the display region covered by the image transfer module (only the portion of the display region 1 covered by the image transfer module is shown in the figure), i.e., the portion of the display region corresponding to the second region of the image transfer module, is located on the same side of the seam region 5. Therefore, partial images of the display area positioned on the same side of the splicing area can be transferred to the splicing area in the first state, and images of the display area covered by the image transfer module are still displayed in the display area in the second state, so that the images are alternately displayed in odd frames and even frames, and human eyes can observe complete images to achieve zero splicing display. In the embodiment, the width of the part of the display area covered by the image transfer module and positioned on the same side of the seam area is consistent with the width of the seam area.
According to other embodiments of the present invention, the portion of the display area covered by the image transfer module may also be located on both sides of the patchwork area 5. Specifically, referring to fig. 5, the portion of the display area covered by the image transfer module (only the portion of the display area 1 covered by the image transfer module and the portion of the display area 2 covered by the image transfer module are shown in the figure) is symmetrical along the central axis of the patchwork area 5. That is, the width of the portion of the display area 1 covered by the image transfer module is the same as the width of the portion of the display area 2 covered by the image transfer module, and is half of the width of the patchwork area. Alternatively, the portion of the display area covered by the image transfer module is not symmetrical along the central axis of the patchwork area 5 (this is not shown in the figure). That is, the width of the portion of the display area 1 covered by the image transfer module is not equal to the width of the portion of the display area 2 covered by the image transfer module, but the width of the two portions is equal to the width of the seam region 5. Therefore, partial images in the display areas on the two sides of the splicing area can be transferred to the splicing area to be displayed in the first state, partial images in the display areas on the two sides of the splicing area are still displayed in the display areas in the second state, the images are alternately displayed in odd frames and even frames, so that human eyes can observe complete images to achieve zero splicing display, and the first area and the second area can select gratings with the same size, positive lenses with the same size and negative lenses with the same size under the condition that the parts of the display areas covered by the image transfer module are symmetrical along the central axis of the splicing area.
According to the embodiment of the invention, for the situation that the part of the display area covered by the image transfer module is symmetrical along the central axis of the splicing area, taking a display panel with 55 inches FHD (pixel size 0.6 mm) and a splicing area width of 3.9mm as an example, the width of the light guide plate is 7.8mm, the lengths of 1/4 of the left end and the right end of the light guide plate respectively cover about 3 pixels of the edge of the display area, the length of 1/2 of the middle of the light guide plate just covers the splicing area, the lengths of 1/4 of the left end and the right end of the light guide plate are respectively provided with one grating, and the length of 1/2 of the middle is provided with two gratings, the grating sizes of all the regions can be consistent, the positive lens sizes can be consistent, and the negative lens sizes can be consistent.
According to an embodiment of the present invention, the focal points of the positive lens 300 and the negative lens 400 are both located on the display panel 2000 (refer to fig. 6). Thereby, an image can be formed on the display panel so that a clear image can be observed by human eyes.
For ease of understanding, the operating principle of the display device is explained in detail below:
according to an embodiment of the present invention, referring to fig. 6, taking a structure that a portion of the display area covered by the image transfer module is located on both sides of the patchwork area as an example, after the grating 200 is opened, light emitted from a point a (the point a may correspond to a pixel at the central point, that is, a pixel at the central field of view) of the display panel is collimated into parallel light by the positive lens 300 in the second area (corresponding to the area where the point a is located) of the image transfer module, and is incident perpendicularly to the grating 200 in the second area, the parallel light is deflected under the diffraction effect of the grating 200 (the emergent light is still parallel light, but the emergent direction is deflected), the deflected light after deflection is totally reflected in the light guide plate 100, and is propagated to the grating 200 in the first area adjacent to the second area after totally reflected, the grating 200 in the first area has the same switching voltage as the grating 200 in the first area, and has the same diffraction deflection angle, the light after being incident to the grating 200 in the first area is diffracted, is transformed into parallel deflected light beams in the perpendicular direction, and is then diffused by the negative lens 400 in the first area, and is imaged on the virtual focus of the negative lens 400'. Therefore, after the grating is opened, the image presented by the pixel at the point A is collimated by the positive lens, diffracted by the second area grating, propagated by total reflection, diffracted by the first area grating and diverged by the second area negative lens, and finally the image is transferred to the splicing region for display. Only the transfer process of the image in the second area on one side is described here, and the transfer process of the image in the second area on the other side is similar and will not be described again. The conditions for total reflection of the light emitted by the grating in the second region in the light guide plate are as follows: the outgoing angle of the outgoing light is larger than the critical angle at which total reflection occurs in the light guide plate.
Referring to fig. 7, after the grating 200 is closed, the grating 200 has no diffraction effect, and therefore, after the parallel light emitted from the positive lens 300 enters the grating 200 in the second region, the propagation direction is not changed, that is, the light emitted from the grating 200 in the second region is parallel light, the parallel light emitted from the grating 200 in the second region is directly diverged by the negative lens 400 in the second region, and is imaged on the virtual focus a of the negative lens, and at this time, the positive lens 300 and the negative lens 400 in the second region are combined into a confocal system. Therefore, after the grating is closed, the position of the image presented by the pixel at the point A is not changed and is still displayed in the second area. The display process of the image in the second area on one side is only described here, and the display process of the image in the second area on the other side is similar and will not be described again.
Referring to fig. 8 and 9, fig. 8 and 9 are optical path diagrams of light emitted from a pixel point of an edge field, and an image transfer process and an imaging process of a point B are the same as those of the point a, and the difference is that the light incident into the second area grating 200 is oblique incident parallel light (the point a is perpendicular incident parallel light), and when the grating is in an open state, a deflection angle of the light emitted through the second area grating 200 is larger, but the condition of total reflection is also satisfied.
According to an embodiment of the present invention, the display panel 2000 may be a liquid crystal display panel, a light emitting diode display panel, or an organic light emitting diode display panel. Therefore, the display panel can realize zero-seam display.
In another aspect of the invention, the invention proposes a method of controlling the display panel described above. According to an embodiment of the invention, the method comprises:
in the first state, the grating is opened, the light rays entering the grating through the positive lens are transferred to the grating in the first region and emitted through the negative lens in the first region by the grating in the second region, and in the second state, the grating is closed, and the light rays entering the grating through the positive lens are directly emitted through the negative lens in the second region by the grating in the second region. Therefore, when the grating is opened, the image on one side of the display area close to the splicing area can be transferred to the splicing area for display, when the grating is closed, the image on one side of the display area close to the splicing area is still displayed in the display area, and the grating is opened and closed, so that the divided images can be alternately displayed in odd frames and even frames, and the purpose of narrowing black lines in the display picture and even zero splicing display is achieved.
According to the embodiment of the invention, the switching frequency of the grating is consistent with the driving frequency of the display panel. Thus, a normal and clear picture can be presented. As is well known to those skilled in the art, a display panel has a plurality of rows of sub-pixels, each row of sub-pixels corresponds to a gate line, the gate lines control the switching of the sub-pixels of the row, and when displaying, the plurality of rows of sub-pixels are turned on row by row, and the driving frequency of the display panel refers to the number of rows of sub-pixels turned on per second. The switching frequency of the grating is set to be consistent with the driving frequency of the display panel, so that the switching of the grating is matched with the display of the display panel, and a normal and clear picture is presented.
According to an embodiment of the invention, the driving frequency of the display panel is at least 120Hz. Because the image on one side of the display area close to the splicing seam area is divided into odd frames and even frames for display, the frequency of the coverage area of the image transfer module is half of the frequency of other areas of the display area, the display picture of the coverage area of the image transfer module can be kept smooth by setting the driving frequency of the display panel to be more than 120Hz, when the driving frequency of the display panel is 120Hz, the complete image of 60 frames per second can be observed by human eyes in the splicing seam area, and the image of 120 frames per second can be observed by human eyes in the other areas of the display area, so that the effect of zero splicing seam display is achieved.
According to an embodiment of the present invention, the grating may be turned on and off by applying a voltage to the grating, and as described above, the refractive index of the liquid crystal in the bragg grating may be changed by the voltage, so that the turning on and off of the grating may be controlled by adjusting the voltage applied to the grating. The specific relationship between the grating on and off and the applied voltage is not particularly limited, and for example, a polymer and a liquid crystal having unequal refractive indices may be selected, and since the refractive indices of the polymer and the liquid crystal are different, the grating is in an on state when no voltage is applied, and the grating is in an off state when the voltage applied to the grating makes the refractive index of the liquid crystal equal to the refractive index of the polymer. Alternatively, a polymer and a liquid crystal having the same refractive index may be selected, and since the polymer and the liquid crystal have the same refractive index, the grating is in an off state when no voltage is applied, and when a voltage is applied to the grating, the refractive index of the liquid crystal changes and is no longer equal to the refractive index of the polymer, so that the grating is in an on state.
According to the embodiment of the present invention, as described above, when the grating is in the on state, the light beam is deflected after passing through the grating and is totally reflected in the light guide plate, and the light beam emitted from the bragg grating can be totally reflected in the light guide plate by controlling the voltage applied to the grating or by controlling the material constituting the grating so that the exit angle of the light beam emitted from the grating is greater than the critical angle of total reflection in the light guide plate, so that the brightness of the image displayed in the patchwork area is consistent with the brightness of the image displayed in the display area, thereby ensuring the brightness of each area of the display screen to be consistent.
According to the embodiment of the invention, by controlling the constituent materials of the grating, it can mean that a polymer and a liquid crystal with large refractive index difference are selected, when no voltage is applied, the grating is in an open state, and the refractive index difference between the polymer and the liquid crystal is enough to enable the exit angle of the light emitted by the grating to be larger than the critical angle of total reflection in the light guide plate. The voltage applied to the grating is controlled to be equal to the refractive index of the polymer and the refractive index of the liquid crystal when the materials are selected, the voltage is applied to the grating to change the refractive index of the liquid crystal, so that the grating is in an open state, and the difference between the refractive index of the liquid crystal and the refractive index of the polymer is larger by controlling the voltage applied to the grating, so that the exit angle of the light emitted by the grating is larger than the critical angle of total reflection in the light guide plate.
For ease of understanding, the display process of the display apparatus is described in detail below:
according to an embodiment of the present invention, referring to fig. 10, the width of the image transfer module is 2 times the width of the seam splicing region, the driving frequency of the display panel is 120Hz, the switching frequency of the bragg grating is consistent with the driving frequency of the display panel, the grating is turned on during odd frames, and the grating is turned off during even frames. Referring to fig. 10 (a), a seam region 5 is provided between the display region 1 and the display region 2, and an area 6 where the orthographic projection of the image transfer module on the display panel is provided covers the seam region 5 and part of the display region 1 and part of the display region 2. During the odd frames, the raster is turned on, and the images of the portions of the display areas 1 and 2 covered by the image transfer module are transferred to the patchwork area, i.e., the patchwork area displays the images of the display areas of the two side portions thereof, while the portion of the display area covered by the image transfer module has no display content and is black (refer to (b) in fig. 10). During the even frame period, the raster is turned off, the entire display region 1 and the display region 2 are normally displayed, the image in the display region is not shifted, and during this period, the patchwork region has no display content and is black (refer to (d) in fig. 10). Therefore, in the area covered by the image transfer module (i.e. area 6), the divided images are alternately displayed at the time of odd frames and even frames, the frame frequency is 120Hz, and due to the human visual residual effect, the human eyes finally observe the complete image of 60 frames per second in the splicing region, and observe the image of 120 frames per second in the other parts of the display region, so as to achieve the effect of zero splicing display.
In the description of the present invention, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description herein, references to the description of "one embodiment," "another embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. In addition, it should be noted that the terms "first" and "second" in this specification are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. An image transfer module, comprising:
the light guide plate is provided with a first area and a second area, a plurality of gratings are arranged in the light guide plate, and at least one grating is arranged in each of the first area and the second area;
a positive lens disposed at one side of the light guide plate and located in the second region;
the negative lenses are arranged on one side of the light guide plate, which is far away from the positive lenses, and are positioned in the first area and the second area, the negative lenses and the gratings are arranged in a one-to-one correspondence manner,
the grating in the second area can transfer the light rays incident to the grating through the positive lens to the grating in the first area in a first state, and the light rays are emitted through the negative lens in the first area;
the grating in the second area can directly emit the light rays which are incident to the grating through the positive lens in the second state through the negative lens in the second area,
the grating is a Bragg grating, the Bragg grating comprises polymer dispersed liquid crystal, and in the extending direction of the Bragg grating, the Bragg grating comprises a polymer layer and a liquid crystal layer which are sequentially and alternately laminated,
the polymer dispersed liquid crystal is configured to make an exit angle of light emitted through the bragg grating larger than a critical angle at which total reflection occurs in the light guide plate when in the first state.
2. The image transfer module of claim 1, wherein the light guide plate comprises a first light guide plate and a second light guide plate arranged in a stack, the grating being disposed between the first light guide plate and the second light guide plate,
the light guide plate is provided with two first areas and two second areas, the two first areas are arranged adjacently, the two second areas are respectively positioned at two sides of the first areas, and the first areas and the second areas are respectively provided with one grating.
3. A display device, comprising:
the display panel comprises a plurality of display areas, and a splicing area is arranged between every two adjacent display areas;
the image transfer module of claim 1 or 2, the image transfer module being located on a light exit side of the display panel and covering the patchwork area and a portion of the display area near the patchwork area, an orthographic projection of the first region on the display panel coinciding with an orthographic projection of the patchwork area on the display panel, the positive lens being disposed toward the display panel.
4. The display device according to claim 3, wherein the width of the image transfer module is 2 times the width of the patchwork area.
5. The display device according to claim 4, wherein a portion of the display area covered by the image transfer module is symmetrical along a central axis of the patchwork area.
6. The display device according to claim 3, wherein the focal points of the positive lens and the negative lens are located on the display panel.
7. A method of controlling the display device of any one of claims 3-6, comprising:
in the first state, the grating is opened, and the light rays incident to the grating through the positive lens are transferred to the grating in the second area and emitted out through the negative lens in the first area by the grating in the second area;
in the second state, the grating is closed, and the light rays incident to the grating through the positive lens in the second area are directly emitted out through the negative lens in the second area by the grating in the second area.
8. The method of claim 7, wherein the switching frequency of the grating corresponds to a driving frequency of the display panel, wherein the driving frequency of the display panel is at least 120Hz.
9. The method according to claim 7, wherein an exit angle of the light emitted through the grating is made larger than a critical angle at which total reflection occurs in the light guide plate by controlling a voltage applied to the grating or by controlling a constituent material of the grating.
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| EP1950726A1 (en) * | 2007-01-26 | 2008-07-30 | Trusty Industrial Inc. | Picture display frame |
| CN102157112A (en) * | 2011-04-07 | 2011-08-17 | 黑龙江省四维影像数码科技有限公司 | Seamless splicing separate LED free stereo display screen |
| CN204302632U (en) * | 2014-12-30 | 2015-04-29 | 京东方科技集团股份有限公司 | Liquid crystal grating and mosaic screen |
| CN109445096A (en) * | 2018-11-06 | 2019-03-08 | 天津大学 | A kind of full-color inclination waveguide projection display system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI676064B (en) * | 2018-03-29 | 2019-11-01 | 友達光電股份有限公司 | Display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1950726A1 (en) * | 2007-01-26 | 2008-07-30 | Trusty Industrial Inc. | Picture display frame |
| CN102157112A (en) * | 2011-04-07 | 2011-08-17 | 黑龙江省四维影像数码科技有限公司 | Seamless splicing separate LED free stereo display screen |
| CN204302632U (en) * | 2014-12-30 | 2015-04-29 | 京东方科技集团股份有限公司 | Liquid crystal grating and mosaic screen |
| CN109445096A (en) * | 2018-11-06 | 2019-03-08 | 天津大学 | A kind of full-color inclination waveguide projection display system |
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