CN212031897U - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN212031897U CN212031897U CN202021045423.2U CN202021045423U CN212031897U CN 212031897 U CN212031897 U CN 212031897U CN 202021045423 U CN202021045423 U CN 202021045423U CN 212031897 U CN212031897 U CN 212031897U
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Abstract
The utility model provides a display panel and display device belongs to and shows technical field, and it can solve current display panel and the poor problem of display device display effect at least partially. The utility model discloses display panel includes: a substrate control sub liquid crystal panel including a light incident side and a light emitting side opposite to each other for controlling the brightness of the transmitted light; a display sub liquid crystal panel located at a light emitting side of the control sub liquid crystal panel for filtering light from the control sub liquid crystal panel to display an image; and a body diffusion sheet is arranged between the control sub liquid crystal panel and the display sub liquid crystal panel.
Description
Technical Field
The utility model belongs to the technical field of show, concretely relates to display panel and display device.
Background
BD Cell (screen-stacked display) technology is widely used in a plurality of fields such as television, vehicle display, and the like.
In the BD Cell technology, two panels with close pixel sizes are overlapped together to realize pixel level optical regulation, and because the overlapped panels have close pixel sizes, an optical interference phenomenon and moire fringes can occur in the display process to influence the display effect and the user experience.
SUMMERY OF THE UTILITY MODEL
The utility model discloses solve the poor problem of current display panel and display device display effect at least, provide a display panel and display device that display effect is good.
An aspect of the present invention provides a display panel, which includes:
a control sub liquid crystal panel including a light incident side and a light emitting side opposite to each other for controlling the brightness of the transmitted light;
a display sub liquid crystal panel located at a light emitting side of the control sub liquid crystal panel for filtering light from the control sub liquid crystal panel to display an image;
and a body diffusion sheet is arranged between the control sub liquid crystal panel and the display sub liquid crystal panel.
Optionally, the bulk diffusion sheet includes a transparent substrate, and a plurality of diffusion structures located inside the substrate, and the diffusion structures are columnar extending along a thickness direction of the bulk diffusion sheet.
Optionally, the control sub-liquid crystal panel includes a first liquid crystal cell and a first lower polarizer located on one side of the first liquid crystal cell close to the light incident side thereof, where the first lower polarizer is a reflective linear polarizer.
Further optionally, the first lower polarizer is a direct-attached high-efficiency reflective linear polarizer.
Further optionally, the display sub-lcd panel includes a second liquid crystal cell, an upper polarizer located on a side of the second liquid crystal cell away from the control sub-lcd panel, and a second lower polarizer located on a side of the second liquid crystal cell close to the control sub-lcd panel.
Further optionally, an alignment layer is disposed in the second liquid crystal cell, and an alignment structure is formed on the alignment layer, and the alignment of the alignment structure is parallel to the absorption axis of the second lower polarizer;
the upper polarizer is a polarizer with a wide-viewing angle compensation film.
Further optionally, an alignment layer is disposed in the second liquid crystal cell, an alignment structure is formed on the alignment layer, and the alignment of the alignment structure is perpendicular to the absorption axis of the second lower polarizer;
the second lower polarizer is a polarizer with a wide-viewing angle compensation film.
Optionally, the bulk diffusion sheet is disposed on the light exit side of the control sub liquid crystal panel and bonded to the display sub liquid crystal panel through an optical adhesive.
Another aspect of the present invention provides a display device, which includes:
a backlight having a light exit side;
the display panel is located on the light-emitting side of the backlight source, wherein the light-entering side of the sub-liquid crystal panel faces the light-emitting side of the backlight source.
Optionally, the backlight source includes a light guide plate and a light source disposed outside at least one side of the light guide plate.
Drawings
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a bulk diffuser in an embodiment of the present invention;
wherein the reference numerals are: 1. controlling the sub liquid crystal panel; 11. a first liquid crystal cell; 12. a first lower polarizer; 2. a display sub liquid crystal panel; 21. a second liquid crystal cell; 22. an upper polarizer; 23. a second lower polarizer; 3. a body diffusion sheet; 31. a transparent substrate; 32. a diffusion structure; 4. optical cement; 5. a backlight source; 51. a light guide plate; 52. a light source; 6. a back plate.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
It is to be understood that the specific embodiments and figures described herein are merely illustrative of the invention and are not limiting of the invention.
It is to be understood that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
It is to be understood that, for the convenience of description, only the portions related to the present invention are shown in the drawings of the present invention, and the portions not related to the present invention are not shown in the drawings.
It is understood that each unit and module related in the embodiments of the present invention may correspond to only one physical structure, and may also be composed of a plurality of physical structures, or a plurality of units and modules may also be integrated into one physical structure.
It will be understood that, without conflict, the functions, steps, etc. noted in the flowchart and block diagrams of the present invention may occur in an order different from that noted in the figures.
It is to be understood that the flowchart and block diagrams of the present invention illustrate the architecture, functionality, and operation of possible implementations of systems, apparatus, devices and methods according to various embodiments of the present invention. Each block in the flowchart or block diagrams may represent a unit, module, segment, code, which comprises executable instructions for implementing the specified function(s). Furthermore, each block or combination of blocks in the block diagrams and flowchart illustrations can be implemented by a hardware-based system that performs the specified functions or by a combination of hardware and computer instructions.
It is to be understood that the units and modules referred to in the embodiments of the present invention may be implemented by software, or may be implemented by hardware, for example, the units and modules may be located in a processor.
Example 1:
referring to fig. 1, the present embodiment provides a display panel, which specifically includes:
a control sub liquid crystal panel 1 including an incident side and an outgoing side opposite to each other, for controlling the brightness of the transmitted light;
a display sub liquid crystal panel 2, located on the light exit side of the control sub liquid crystal panel 1, for filtering the light from the control sub liquid crystal panel 1 to display an image;
a bulk diffusion sheet 3 is provided between the control sub liquid crystal panel 1 and the display sub liquid crystal panel 2.
As shown in fig. 1, the display panel of the present embodiment is mainly composed of a control sub liquid crystal panel 1 and a display sub liquid crystal panel 2. The display sub liquid crystal panel 2 is located on the light-emitting side of the control sub liquid crystal panel 1 so that the control sub liquid crystal panel 1 controls the brightness of light entering the display sub liquid crystal panel 2. Thus, the present display panel is a display panel using the BD Cell (stacked display) technology.
The liquid crystal panel 1 is a single-color liquid crystal panel, that is, only the brightness of light entering from the light-in side of the liquid crystal panel 1 is changed, and the light after the brightness change enters the liquid crystal panel 2 to generate a finally displayed color image.
If the image screen is displayed as a black field, the luminance of the pixel of the display sub liquid crystal panel 2 corresponding to the screen should be 0 (i.e., no light), but due to technical limitations, the luminance of the pixel of the display sub liquid crystal panel 2 corresponding to the screen cannot be 0. Therefore, the luminance of the pixel of the display sub liquid crystal panel 2 corresponding to the screen is lower than that of the other pixels, and the lower the luminance, the better the effect of displaying the screen.
In the display panel of this embodiment, the light entering the display panel does not directly enter the sub-liquid crystal display panel 2, but passes through the sub-liquid crystal display panel 1, and the light that the sub-liquid crystal display panel 1 can pass through is intercepted and reduced to improve the display effect of the brightness of the light that is displayed on the sub-liquid crystal display panel 2.
In each liquid crystal panel, because a light-blocking black matrix is arranged between different pixels (which is convenient for realizing different brightness of different pixels), one panel is equivalent to a grating as a whole, and two panels with small pixel size difference are superposed together, so that an optical interference phenomenon can be generated. When the incident light is white light, light waves with the same frequency are generated in a spatial superposition mode, and constructive interference occurs when the phase difference is a certain numerical value; since the constructive interference positions of light of different wavelengths are different, that is, light of different wavelengths may have diffraction fringes at different positions, this may result in the occurrence of color fringes, i.e., moire fringes.
In order to control the sub liquid crystal panel 1 at the pixel level of the display sub liquid crystal panel 2, the size of the pixel of the control sub liquid crystal panel 1 needs to be the same as or not much different from the size of the pixel of the display sub liquid crystal panel 2, so that if the control sub liquid crystal panel 1 and the display sub liquid crystal panel 2 are simply superposed, a moire pattern appears in a displayed image.
The display panel of the embodiment adds the body diffusion sheet 3 between the control sub liquid crystal panel 1 and the display sub liquid crystal panel 2, and changes the light propagation direction through the body diffusion sheet 3, thereby weakening the superposition of light waves with the same frequency in the space, and improving the occurrence of moire fringes.
In the prior art, a diffusion sheet is generally a resin layer (or diffusion layer) which is coated on the upper surface of a substrate (or substrate layer) with a certain thickness and contains diffusion particles with different sizes, and a protective layer which is used for preventing close adhesion between films and scratch between films is arranged on the lower surface of the substrate layer.
In the display panel of the present embodiment, a bulk diffusion sheet is used, that is, a structure (e.g., diffusion particles) having a diffusion function is integrated into a substrate (or a substrate layer), and the light can be diffused throughout the substrate (or the substrate layer) without using an additional diffusion layer for the diffusion function.
Alternatively, referring to fig. 2, the bulk diffusion sheet 3 includes a transparent substrate 31 and a plurality of diffusion structures 32 located inside the substrate, and the diffusion structures 32 are columnar structures extending in the thickness direction of the bulk diffusion sheet 3.
Referring to fig. 2, the bulk diffusion sheet 3 includes a transparent substrate 31 and a diffusion structure 32 disposed in the transparent substrate 31. Because the transparent substrate 31 is filled with the diffusion structures 32, when light (such as light emitted from a point light source) enters the transparent substrate 31, the propagation direction changes when encountering the diffusion structures 32 in the transparent substrate 31. When the diffusion structure 32 is a cylindrical structure, the length of the cylindrical structure in the light incident and light exiting directions (i.e., the thickness direction) of the bulk diffusion sheet is larger (or is a long cylinder) than that of other structures (e.g., a spherical structure), so that the diffusion path of the light after being diffused on the surface thereof is longer, and the display is clearer.
Experimental data also show that the diffusion sheet with the columnar diffusion structure has better Moire eliminating effect and clearer display than the diffusion sheet with the diffusion structure of diffusion particles.
Optionally, referring to fig. 1, the bulk diffusion sheet 3 is disposed on the light exit side of the control sub liquid crystal panel 1, and is bonded to the display sub liquid crystal panel 2 through an optical adhesive 4.
The utility model discloses display panel's body diffusion piece 3 is located the light-emitting side of control sub liquid crystal display panel 1, and it bonds with display sub liquid crystal display panel 2 through OCA (optical Clear Adhesive) 4.
The OCA is a special adhesive for cementing transparent optical elements (such as lenses and the like), has the light transmittance of more than 90 percent, can reduce the light loss of the liquid crystal panel, and helps to increase the display brightness of the liquid crystal panel and reduce the energy consumption.
Optionally, the controller liquid crystal panel 1 includes a first liquid crystal cell 11 and a first lower polarizer 12 located on one side of the first liquid crystal cell 11 close to the light incident side thereof, where the first lower polarizer 12 is a reflective linear polarizer.
Referring to fig. 1, the controller liquid crystal panel 1 includes a first liquid crystal cell 11 and a first lower polarizer 12 located on a side of the first liquid crystal cell 11 close to the light incident side of the controller liquid crystal panel 1.
Wherein, the first lower polarizer 12 is a reflective linear polarizer.
The controller liquid crystal panel 1 includes a first liquid crystal cell 11 and a first lower polarizer 12, wherein the first lower polarizer 12 is located on the light incident side of the controller liquid crystal panel 1, that is, on the side away from the display liquid crystal panel 2.
The transmittance of light of the display panel having two liquid crystal panels is reduced compared to the display panel having only one liquid crystal panel, and experimental data shows that the display panel having two liquid crystal panels has an overall transmittance reduced by about 40% compared to the display panel having only one liquid crystal panel. The decrease of the light transmittance may cause that the power consumption of the display panel having two liquid crystal panels increases by 30% to 40% compared with the power consumption of the display panel having only one liquid crystal panel, and the increase of the power consumption means that the display panel generates more heat, and a heat dissipation structure may be added to the display panel, thereby increasing the design cost of the display panel.
Therefore, the display panel having two liquid crystal panels has a structure in which a DBEF (Dual Brightness Enhancement Film) is put to improve light energy utilization efficiency to reduce optical loss and improve the luminance of the display panel.
DBEF is a brightness enhancement film which is composed of a multi-film layer structure in the middle and can convert all natural light into polarized light, and the difference from a common linear polarizer is that only half of the natural light can pass through the common linear polarizer and is absorbed in addition; and the DBEF can convert all the backlight into polarized light which is consistent with the transmission axis of the linear polarizer, so that the transmittance of the light is improved, namely the utilization efficiency of light energy is improved.
DBEF is often used with a linear iodine polarizer in practical use, wherein the transmittance of the linear iodine polarizer for linearly polarized light is about 90%, and the transmittance of the DBEF for linearly polarized light is 85% to 90%, so the total transmittance of the combination of DBEF and linear iodine polarizer is about 80% to 85%.
However, DBEF itself has Haze, and Haze (Haze) values of 40% and 80% are currently common, and the Haze itself causes absorption of light, which causes a decrease in light transmittance, that is, a decrease in light energy utilization efficiency.
Compared with the combination of DBEF and linear iodine polarizer, the reflective linear polarizer, such as DLRP (direct bonded high efficiency reflective linear polarizer) and RPM (reflective polarizing film), not only can achieve the same effect as DBEF, i.e. the backlight is completely converted into polarized light with the same transmission axis as the linear polarizer, but also the reflective linear polarizer has no haze, so that the light transmittance is not reduced due to the haze compared with DBEF, that is, the utilization efficiency of light energy can be further improved compared with DBEF.
Further alternatively, first lower polarizer 12 is a DLRP (direct attached high efficiency reflective linear polarizer).
As one of the reflective linear polarizers, DLRP is low in price, and experiments show that the DLRP has better combination effect than DBEF and a linear iodine polarizer.
Experimental data show that, under the same power consumption, if a combination of DBEF and linear iodine polarizer is used, the display brightness is 1192nit, while using DLRP, the display brightness is 1454nit, and the brightness is improved by 18%.
Of course, the first lower polarizer 12 may also be other optical film materials, such as 3 linear iodine-based polarizers or 4 linear iodine-based polarizers, and compared to DLRP, under the same power consumption, the display brightness of 4 linear iodine-based polarizers is lower, but the display contrast is higher than that of DLRP, the display effect of 3 iodine-based polarizers is between that of DLRP and 4 iodine-based polarizers, and different optical film materials may be selected according to different display requirements.
Further optionally, the display sub-lcd panel 2 includes a second liquid crystal cell 21, an upper polarizer 22 located on a side of the second liquid crystal cell 21 away from the controller sub-lcd panel 1, and a second lower polarizer 23 located on a side of the second liquid crystal cell 21 close to the controller sub-lcd panel 1.
Further optionally, an orientation layer is disposed in the second liquid crystal cell 21, and an orientation structure is formed on the orientation layer, and the orientation of the orientation structure is parallel to the absorption axis of the second lower polarizer 23;
the upper polarizer 22 is a polarizer with a wide viewing angle compensation film.
Further optionally, an orientation layer is disposed in the second liquid crystal cell 21, an orientation structure is formed on the orientation layer, and the orientation of the orientation structure is perpendicular to the absorption axis of the second lower polarizer 23;
the second lower polarizer 23 is a polarizer with a wide viewing angle compensation film.
The sub-lcd panel 2 includes a second lcd cell 21, an upper polarizer 22 and a second lower polarizer 23, wherein the upper polarizer 22 is located on a side of the sub-lcd panel 2 away from the sub-lcd panel 1, and the second lower polarizer 23 is located on a side of the sub-lcd panel 2 close to the sub-lcd panel 1.
The second liquid crystal cell 21 is provided with an alignment layer on which alignment structures (e.g., elongated grooves) are formed for controlling the direction of the liquid crystal arrangement, and the arrangement of the liquid crystal in the second liquid crystal cell 21 of the currently commonly used liquid crystal display panel 2 mainly has two forms: one is that in the non-energized state, the orientation of the liquid crystal in the second liquid crystal cell 21 is parallel to the absorption axis of the second lower polarizer 23; the other is that in the non-energized state, the orientation of the liquid crystal in the second liquid crystal cell 21 is perpendicular to the absorption axis of the second lower polarizer 23.
Since the display sub liquid crystal panel 2 and the controller sub liquid crystal panel 1 are not integrally formed but are attached to each other by other optical components (e.g., OCA), a gap inevitably exists between the display sub liquid crystal panel 2 and the controller sub liquid crystal panel 1; in addition, the display sub liquid crystal panel 2 and the control sub liquid crystal panel 1 are liquid crystal panels in nature, and the optical path difference of the liquid crystal panel is different for light in different propagation directions, so that the problem that a dark-state picture is slightly bright under a large viewing angle exists in a picture displayed by the display sub liquid crystal panel 2, and further, the contrast is seriously reduced under the large viewing angle, and halo is easily generated.
This problem can be solved by adding a compensation layer (e.g., a wide viewing angle compensation film) on the sub-liquid crystal panel 2.
The arrangement directions of the liquid crystal are different when the liquid crystal is not electrified, and different effects can be achieved by increasing different positions of the wide-viewing angle compensation film.
When the orientation of the liquid crystal in the second liquid crystal cell 21 is parallel to the absorption axis of the second lower polarizer 23 in the non-energized state, if the upper polarizer 22 is a polarizer with a wide viewing angle compensation film, the wide viewing angle compensation film can compensate the change of the optical path difference generated due to the liquid crystal characteristics and the like at a large viewing angle back to no optical path difference change, that is, the elliptically polarized light without a compensation layer is changed into linearly polarized light, thereby improving the problem that the dark picture is bright at a large viewing angle.
However, when the orientation of the liquid crystal in the second liquid crystal cell 21 is parallel to the absorption axis of the second lower polarizer 23 in the non-energized state, if the second lower polarizer 23 is a polarizer with a wide viewing angle compensation film, the compensation is excessive, so that the light emitted finally is still elliptically polarized light, and the problem of a dark-state image being brighter at a large viewing angle cannot be solved.
On the contrary, when the orientation of the liquid crystal in the second liquid crystal cell 21 is perpendicular to the absorption axis of the second lower polarizer 23 in the non-energized state, if the second lower polarizer 23 is a polarizer with a wide viewing angle compensation film, the wide viewing angle compensation film can compensate the change of the optical path difference generated due to the liquid crystal characteristics and the like at a large viewing angle back to no optical path difference change, that is, the elliptically polarized light without the compensation layer is changed into the linearly polarized light, thereby improving the problem that the dark-state picture is bright at a large viewing angle.
However, when the orientation of the liquid crystal in the second liquid crystal cell 21 is perpendicular to the absorption axis of the second lower polarizer 23 in the non-energized state, if the upper polarizer 22 is a polarizer with a wide-viewing angle compensation film, the compensation is excessive, and the light emitted finally is still elliptically polarized light, which cannot improve the problem of the bright dark-state picture in a large viewing angle.
The display panel of the embodiment adds the bulk diffusion sheet 3 between the control sub liquid crystal panel 1 and the display sub liquid crystal panel 2, and has little influence on the definition of a display picture on the basis of eliminating Moire patterns of the display picture; the reflective polarizer is used for improving the utilization efficiency of light energy, and the cost is low and the effect is good; meanwhile, a compensation layer is added on the display sub liquid crystal panel 2 to solve the problem that dark pictures are brighter under a large visual angle.
Example 2:
referring to fig. 1, the present embodiment provides a display device, which specifically includes:
a backlight 5 having a light exit side;
the display panel is located on the light-emitting side of the backlight 5, wherein the light-entering side of the sub liquid crystal panel 1 faces the light-emitting side of the backlight 5.
Optionally, the backlight 5 includes a light guide plate 51 and a light source 52 disposed outside at least one side of the light guide plate 51.
The display device further comprises a back plate 6 arranged at a side of the light guide plate 51 remote from the display panel.
Specifically, the display device can be any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A display panel, comprising:
a control sub liquid crystal panel including a light incident side and a light emitting side opposite to each other for controlling the brightness of the transmitted light;
a display sub liquid crystal panel located at a light emitting side of the control sub liquid crystal panel for filtering light from the control sub liquid crystal panel to display an image;
and a body diffusion sheet is arranged between the control sub liquid crystal panel and the display sub liquid crystal panel.
2. The display panel according to claim 1,
the body diffusion sheet comprises a transparent base material and a plurality of diffusion structures positioned in the base material, wherein the diffusion structures are columnar extending along the thickness direction of the body diffusion sheet.
3. The display panel according to claim 1,
the control sub liquid crystal panel comprises a first liquid crystal box and a first lower polaroid positioned on one side of the first liquid crystal box close to the light incident side of the first liquid crystal box, wherein the first lower polaroid is a reflective linear polaroid.
4. The display panel according to claim 3,
the first lower polaroid is a direct-attached high-efficiency reflection type linear polaroid.
5. The display panel according to claim 3,
the display sub liquid crystal panel comprises a second liquid crystal box, an upper polaroid and a second lower polaroid, wherein the upper polaroid is positioned on one side, far away from the control sub liquid crystal panel, of the second liquid crystal box, and the second lower polaroid is positioned on one side, close to the control sub liquid crystal panel, of the second liquid crystal box.
6. The display panel according to claim 5,
an orientation layer is arranged in the second liquid crystal box, an orientation structure is formed on the orientation layer, and the orientation of the orientation structure is parallel to the absorption axis of the second lower polarizer;
the upper polarizer is a polarizer with a wide-viewing angle compensation film.
7. The display panel according to claim 5,
an orientation layer is arranged in the second liquid crystal box, an orientation structure is formed on the orientation layer, and the orientation of the orientation structure is vertical to the absorption axis of the second lower polarizer;
the second lower polarizer is a polarizer with a wide-viewing angle compensation film.
8. The display panel according to claim 1,
the body diffusion sheet is arranged on the light emergent side of the control sub liquid crystal panel and is bonded with the display sub liquid crystal panel through optical cement.
9. A display device, comprising:
a backlight having a light exit side;
the display panel of any one of claims 1 to 8, located on a light exit side of the backlight, wherein a light entrance side of the controller liquid crystal panel faces the light exit side of the backlight.
10. The display device according to claim 9,
the backlight source comprises a light guide plate and a light source arranged outside at least one side face of the light guide plate.
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| CN113219712A (en) * | 2021-04-25 | 2021-08-06 | 北海惠科光电技术有限公司 | Display panel and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113219712A (en) * | 2021-04-25 | 2021-08-06 | 北海惠科光电技术有限公司 | Display panel and display device |
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