Display panel and display device

Abstract

The utility model discloses a display panel and a display device. The display panel includes: a liquid crystal cell; the backlight module comprises a diffusion plate, a light guide plate and a reflecting plate which are sequentially far away from the liquid crystal box; the backlight module further comprises a light source. The light guide plate is used for adjusting emergent light of the light source into an area light source. The quarter-wave plate is located between the liquid crystal box and the backlight module; at least part of the light modulation layer is located between the quarter-wave plate and the liquid crystal box, and the light modulation layer is used for transmitting first linear polarized light and reflecting second linear polarized light; the polarization direction of the first linear polarized light is perpendicular to the polarization direction of the second linear polarized light. The penetration rate of the display panel can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to display technical field especially, relate to a display panel and display device. BACKGROUND

[0002] Liquid crystal display panel has important application in modern display technology field, and the performance requirement of liquid crystal display panel is also higher and higher accordingly.

[0003] The light emitted by the backlight module in the liquid crystal display panel is polarized by the lower polarizer, and the upper polarizer is used for detecting the polarization. In the related technology, the light with the same polarization direction as the transmission axis of the lower polarizer in the light emitted by the backlight module can penetrate the lower polarizer. The light with other polarization directions cannot penetrate the lower polarizer, so that this part of light is wasted, that is, the transmittance of the light in the liquid crystal display panel is low, and the performance of the liquid crystal display panel is poor. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of display panel and display device to improve the transmittance of display panel.

[0005] According to an aspect of the utility model, a display panel is provided, the display panel comprises:

[0006] A liquid crystal cell;

[0007] A backlight module, the backlight module comprises a diffusion plate, a light guide plate and a reflecting plate away from the liquid crystal cell in sequence;The backlight module further comprises a light source, and the light guide plate is used to adjust the emergent light of the light source into a surface light source;

[0008] A quarter-wave plate between the liquid crystal cell and the backlight module;

[0009] A light modulation layer at least partially between the quarter-wave plate and the liquid crystal cell, the light modulation layer is used to transmit first linearly polarized light and reflect second linearly polarized light;The polarization direction of the first linearly polarized light and the second linearly polarized light is perpendicular.

[0010] Optionally, the light modulation layer comprises a multilayer film reflective polarizer, and the multilayer film reflective polarizer is in contact with the liquid crystal cell.

[0011] Optionally, the light modulation layer comprises a metal wire grid polarizer, and the metal wire grid polarizer is in contact with the liquid crystal cell.

[0012] Optionally, the light modulation layer comprises a double brightness enhancement film and a first polarizer.

[0013] The dual brightness enhancement film is located between the first polarizer and the quarter wave plate; the first polarizer is used to transmit the first linearly polarized light.

[0014] Optionally, the dual brightness enhancement film comprises a plurality of reflective polarizer layers; the quarter wave plate is integrated in the dual brightness enhancement film, and at least one of the reflective polarizer layers is located between the quarter wave plate and the first polarizer.

[0015] Optionally, the display panel further comprises a prism film, the prism film being located between the quarter wave plate and the backlight module.

[0016] Optionally, the display panel further comprises a second polarizer, the second polarizer being located on a side of the liquid crystal cell away from the backlight module, and the second polarizer is used to transmit the second linearly polarized light.

[0017] Optionally, the light source is located on a side of the light guide plate.

[0018] Optionally, the liquid crystal cell comprises:

[0019] an array substrate located on a side of the light ray modulation layer away from the backlight module;

[0020] a liquid crystal layer located on a side of the array substrate away from the backlight module;

[0021] a color film substrate located on a side of the liquid crystal layer away from the array substrate.

[0022] According to another aspect of the present application, a display device is provided, which comprises the display panel as described above.

[0023] The display panel comprises a liquid crystal cell, a backlight module, a quarter wave plate and a light ray modulation layer. The backlight module comprises a diffusion plate, a light guide plate and a reflecting plate in sequence away from the liquid crystal cell; the backlight module further comprises a light source, and the light guide plate is used to adjust the light emitted by the light source into a surface light source. The quarter wave plate is located between the liquid crystal cell and the backlight module. At least part of the light ray modulation layer is located between the quarter wave plate and the liquid crystal cell, and the light ray modulation layer is used to transmit first linearly polarized light and reflect second linearly polarized light; the polarization directions of the first linearly polarized light and the second linearly polarized light are perpendicular. By arranging the quarter wave plate and the light ray modulation layer, the second linearly polarized light reflected by the light ray modulation layer can be modulated into the first linearly polarized light, so that the light transmittance can be improved. In addition, the light ray modulation layer and the quarter wave plate are not arranged between the light guide plate and the diffusion plate, so that the light entering the liquid crystal cell is the first linearly polarized light, and the uniformity of the brightness of the display panel can be improved.

[0024] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to make the technical solutions in the embodiments of the present application clearer, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0026] Figure 1 A structural schematic diagram of a display panel provided by the present application is shown in the figure.

[0027] Figure 2 A structural schematic diagram of a display panel provided by the present application is shown in the figure. Figure 1 A light ray modulation principle schematic diagram of the display panel shown in the figure.

[0028] Figure 3 A structural schematic diagram of a display panel provided by the present application is shown in the figure.

[0029] Figure 4 A structural schematic diagram of a display panel provided by the present application is shown in the figure.

[0030] Figure 5 A structural schematic diagram of a display panel provided by the present application is shown in the figure.

[0031] Figure 6 A structural schematic diagram of a display panel provided by the present application is shown in the figure.

[0032] Figure 7 A structural schematic diagram of a display device provided by the present application is shown in the figure. DETAILED DESCRIPTION

[0033] In order to make the technical solutions in the embodiments of the present application clearer, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0034] It should be noted that the terms "first", "second", and the like in the description and in the claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be exchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] Figure 1 A structural schematic diagram of a display panel is provided for the embodiments of the utility model, Figure 1 The display panel comprises a liquid crystal box 1, a backlight module 2, a quarter wave plate 3 and a light ray modulation layer 4. The backlight module 2 comprises a diffusion plate 23, a light guide plate 22 and a reflecting plate 21 away from the liquid crystal box 1 in sequence; the backlight module 2 further comprises a light source 24, and the light guide plate 22 is used for adjusting the emergent light of the light source 24 into a surface light source. The quarter wave plate 3 is located between the liquid crystal box 1 and the backlight module 2. At least part of the light ray modulation layer 4 is located between the quarter wave plate 3 and the liquid crystal box 1, and the light ray modulation layer 4 is used for transmitting first linearly polarized light and reflecting second linearly polarized light; the polarization directions of the first linearly polarized light and the second linearly polarized light are perpendicular.

[0036] Specifically, the display panel of the embodiment is a liquid crystal display panel, and the structure comprises a liquid crystal box 1 and a backlight module 2. The backlight module 2 is used for providing backlight, and the liquid crystal box 1 can control the brightness of each pixel through the deflection direction of the liquid crystal molecules corresponding to each pixel inside, and then display the corresponding picture. The light emitted by the light source 24 in the backlight module 2 is modulated into a surface light source towards the diffusion plate 23 after passing through the light guide plate 22. It can be understood that the light guide plate 22 is provided with a dot structure on the side close to the reflecting plate 21, and the dot structure can destroy the total reflection condition of the light, so that the light can change direction and transmit through the light guide plate 22. The reflecting plate 21 is, for example, a PET film comprising a high-reflectivity metal film coating layer, or a structure composed of a high-reflectivity polymer resin core layer and upper and lower PET layers. The reflecting plate 21 can reflect the light propagating towards the reflecting plate 21 in the backlight module 2 back to the inside of the backlight module 2, so as to improve the utilization rate of light. The diffusion plate 23 can change the light propagation path of incident light to ensure that the incident light can be fully diffused. Exemplarily, inorganic or organic light scattering particles can be doped in the base material of the diffusion plate 23, or the surface microstructure of the base material is used to make the incident light produce multidirectional refraction, reflection and scattering, etc., so as to achieve the effect of diffusing light by the diffusion plate 23.

[0037] In the embodiment, the display panel further comprises a quarter wave plate 3 and a light modulation layer 4. The light modulation layer 4 can be a composite structure, at least part of the film layers of which are located between the quarter wave plate 3 and the liquid crystal cell 1. And the at least part of the film layers mentioned above comprise a film layer that can transmit first linearly polarized light and reflect second linearly polarized light. As shown in the figure, Figure 2 Figure 2 As shown in the figure, Figure 1 As shown in the figure, Figure 2 In the figure, the first linearly polarized light is represented by red arrows, and the second linearly polarized light is represented by purple arrows. The light emitted by the backlight module 2 can be understood as natural light, which can be decomposed into orthogonal first linearly polarized light and second linearly polarized light. For example, the first linearly polarized light can be P light, and the second linearly polarized light can be S light. The natural light emitted by the backlight module 2 is still natural light after passing through the quarter wave plate 3, that is, it can still be decomposed into first linearly polarized light and second linearly polarized light. When the natural light is incident on the film layer of the light modulation layer 4 located between the quarter wave plate 3 and the liquid crystal cell 1, the first linearly polarized light transmits through the light modulation layer 4, and the second linearly polarized light is reflected. When the reflected second linearly polarized light passes through the quarter wave plate 3, its polarization state changes and becomes left-handed or right-handed circularly polarized light. When the left-handed circularly polarized light is reflected by the backlight module 2, it becomes right-handed circularly polarized light; when the right-handed circularly polarized light is reflected by the backlight module 2, it becomes left-handed circularly polarized light. The circularly polarized light reflected by the backlight module 2 again penetrates the quarter wave plate 3 and is modulated into first linearly polarized light, so that it can penetrate the light modulation layer 4. As can be seen from the above, the display panel of the embodiment can greatly improve the light utilization rate, that is, the light transmittance of the display panel, by arranging the quarter wave plate 3 and the light modulation layer 4.

[0038] In addition, in the embodiment, the quarter wave plate 3 and the light modulation layer 4 are both located between the backlight module 2 and the liquid crystal cell 1, rather than being located inside the backlight module 2. There is no light modulation layer and quarter wave plate between the light guide plate 22 and the diffusion plate 23 in the backlight module 2, which avoids the randomization of the polarization direction caused by the diffusion of the first linearly polarized light that transmits through the light modulation layer 4 by the diffusion plate 23, so as to ensure that the light entering the liquid crystal cell 1 is first linearly polarized light. In addition, the light distribution after diffusion by the diffusion plate 23 is more uniform, and the light modulation layer 4 can provide more consistent viewing angles after polarization, reduce the brightness deviation between different pixels, and improve the brightness uniformity of the display panel.

[0039] ​The technical scheme of the embodiment comprises a display panel, which comprises a liquid crystal box 1, a backlight module 2, a quarter-wave plate 3 and a light modulation layer 4. The backlight module 2 comprises a diffusion plate 23, a light guide plate 22 and a reflecting plate 21 which are sequentially away from the liquid crystal box 1; the backlight module 2 further comprises a light source 24, and the light guide plate 22 is used for adjusting the light emitted by the light source 24 into a surface light source. The quarter-wave plate 3 is located between the liquid crystal box 1 and the backlight module 2. At least part of the light modulation layer 4 is located between the quarter-wave plate 3 and the liquid crystal box 1, and the light modulation layer 4 is used for transmitting first linearly polarized light and reflecting second linearly polarized light; the polarization directions of the first linearly polarized light and the second linearly polarized light are perpendicular. By arranging the quarter-wave plate 3 and the light modulation layer 4, the second linearly polarized light reflected by the light modulation layer 4 can be modulated into the first linearly polarized light again, so that the light transmittance can be improved. In addition, the light modulation layer 4 and the quarter-wave plate 3 are not arranged between the light guide plate 22 and the diffusion plate 23, so that the light entering the liquid crystal box 1 is the first linearly polarized light, and the uniformity of the brightness of the display panel can be improved.

[0040] Optionally, with reference back to Figure 1 In some embodiments, the light source 24 is located at the side of the light guide plate 22. The light emitted by the light source 24 enters the light guide plate 22 from the side and is adjusted by the light guide plate 22 into a surface light source which is emitted towards the liquid crystal box 1.

[0041] Optionally, with reference back to Figure 1 The liquid crystal box 1 comprises an array substrate 11, a liquid crystal layer 12 and a color film substrate 13. The array substrate 11 comprises a plurality of pixel circuits for providing the liquid crystal molecules corresponding to the pixels with electric fields of corresponding intensities. The liquid crystal molecules are deflected in different directions according to the intensities of the electric fields. The color film substrate 13 comprises a color film layer for realizing color display.

[0042] Optionally, with reference back to Figure 3 , Figure 3 A structure diagram of still another display panel provided by the utility model is shown. In the embodiment, the light modulation layer 4 comprises a multilayer film reflective polarizer (Advanced Polarizer Film, APF) 41 which is arranged in contact with the liquid crystal box 1.

[0043] Specifically, the multilayer film reflective polarizer 41 has a plurality of optical thin films, and the polarization separation is realized through the interference and reflection of the plurality of optical thin films, that is, the first linearly polarized light is transmitted, and the second linearly polarized light is reflected. In the embodiment, the multilayer film reflective polarizer 41 acts as the lower polarizer of the display panel, that is, plays a role of polarizing. As Figure 1 and Figure 3As shown, the display panel further comprises a second polarizer 5, which is configured to transmit the second linearly polarized light. That is, the second polarizer 5 functions as an analyzer. The transmission axis of the second polarizer 5 is perpendicular to the transmission axis of the multilayer film reflective polarizer 41. The display function of the display panel is realized by the cooperation of the multilayer film reflective polarizer 41 and the second polarizer 5.

[0044] Optionally, Figure 4 A structure diagram of another display panel provided by the embodiment of the utility model is shown in FIG. 4. As shown, the display panel further comprises a second polarizer 5, which is configured to transmit the second linearly polarized light. That is, the second polarizer 5 functions as an analyzer. The transmission axis of the second polarizer 5 is perpendicular to the transmission axis of the multilayer film reflective polarizer 41. The display function of the display panel is realized by the cooperation of the multilayer film reflective polarizer 41 and the second polarizer 5. Figure 4 The light modulation layer 4 comprises a wire grid polarizer (WGP) 42, which is in contact with the liquid crystal cell 1.

[0045] Specifically, the wire grid polarizer 42 has nanoscale metal wires arranged periodically, and the metal wires are arranged in parallel in a single direction, forming a periodic structure in the form of a grid. When the electric field direction of the incident light is parallel to the wire grid, the electric field cannot drive the free electrons in the metal wires to form a strong current, so that most of the light can directly pass through the wire grid polarizer 42. When the electric field direction of the incident light is perpendicular to the wire grid, the electric field will excite the electrons in the metal wires to oscillate, resulting in reflection of light. In this embodiment, the wire grid polarizer 42 can transmit the first linearly polarized light and reflect the second linearly polarized light. In addition, the wire grid polarizer 42 functions as a lower polarizer of the display panel, that is, it functions as a polarizer. As shown in FIG. 2, the transmission axis of the wire grid polarizer 42 is perpendicular to the transmission axis of the first polarizer 44. Figure 1 and Figure 3 As shown, the display panel further comprises a second polarizer 5, which is configured to transmit the second linearly polarized light. That is, the second polarizer 5 functions as an analyzer. The transmission axis of the second polarizer 5 is perpendicular to the transmission axis of the multilayer film reflective polarizer 41. The display function of the display panel is realized by the cooperation of the multilayer film reflective polarizer 41 and the second polarizer 5.

[0046] Optionally, Figure 5 A structure diagram of another display panel provided by the embodiment of the utility model is shown in FIG. 4. As shown, the display panel further comprises a second polarizer 5, which is configured to transmit the second linearly polarized light. That is, the second polarizer 5 functions as an analyzer. The transmission axis of the second polarizer 5 is perpendicular to the transmission axis of the multilayer film reflective polarizer 41. The display function of the display panel is realized by the cooperation of the multilayer film reflective polarizer 41 and the second polarizer 5. Figure 5 The light modulation layer 4 comprises a dual brightness enhancement film (DBEF) 43 and a first polarizer 44. The dual brightness enhancement film 43 is located between the first polarizer 44 and the quarter-wave plate 3, and the first polarizer 44 is configured to transmit the first linearly polarized light.

[0047] Specifically, in the embodiment, the function of the light modulation layer can be realized by the dual brightness enhancement film 43 and the first polarizer 44. The dual brightness enhancement film 43 can transmit the polarized light (first linearly polarized light) in the light emitted by the light guide plate 22 that is consistent with the penetration axis of the dual brightness enhancement film 43, and the polarized light (second linearly polarized light) orthogonal to the penetration axis is reflected back to the backlight module 2 by the multi-layer structure in the dual brightness enhancement film 43, and is converted into the first linearly polarized light again by the action of the quarter-wave plate 3. In the embodiment, although the dual brightness enhancement film 43 has the penetration axis, part of the light in other polarization directions can still pass through the dual brightness enhancement film 43, and therefore, by arranging the first polarizer 44, it can be ensured that the light entering the liquid crystal box 1 is the first linearly polarized light.

[0048] As shown in Figure 5 , the display panel further comprises a second polarizer 5, and the second polarizer 5 is used to transmit the second linearly polarized light. That is, the second polarizer 5 plays a role of a polarimeter. The penetration axis of the second polarizer 5 is perpendicular to the penetration axis of the first polarizer 44. The display function of the display panel is realized by the cooperation of the first polarizer 44 and the second polarizer 5. In addition, it should be noted that the penetration axis of the first polarizer 44 is perpendicular to the penetration axis of the dual brightness enhancement film 43 in the embodiment.

[0049] Optionally, the dual brightness enhancement film 43 comprises a plurality of reflective polarizer layers, the quarter-wave plate 3 is integrated in the dual brightness enhancement film 43, and at least one reflective polarizer layer is arranged between the quarter-wave plate 3 and the first polarizer 44.

[0050] Specifically, in the embodiment, the quarter-wave plate 3 can be integrated in the dual brightness enhancement film 43, and at least one reflective polarizer layer is arranged between the quarter-wave plate 3 and the first polarizer 44, so that the quarter-wave plate 3 can receive the second linearly polarized light reflected by the reflective polarizer layer. The quarter-wave plate 3 is integrated in the dual brightness enhancement film 43, so that the integration degree of the display panel is higher. In some embodiments, at least one reflective polarizer layer can be arranged on both sides of the quarter-wave plate 3.

[0051] Optionally, Figure 6 Another structure diagram of a display panel provided by the embodiment of the utility model is shown in Figure 6 . The display panel further comprises a prism film 6, and the prism film 6 is located between the quarter-wave plate 3 and the backlight module 2.

[0052] Specifically, the prism film 6 can concentrate the divergent light emitted by the diffusion plate 23 into a smaller angle, thereby improving the luminance at the normal viewing angle. The surface of the prism film 6 is provided with microstructures, when the light propagates to the microstructures, internal total reflection, refraction to the front, and partial light entering the adjacent microstructures and refraction and reflection occur. The above processes jointly act, so that the light can be emitted at a smaller angle.

[0053] The utility model further provides a kind of display device, as shown in Figure 7 , Figure 7 The structure diagram of a kind of display device provided by the utility model embodiment. Display device includes the display panel provided by any embodiment of the utility model. Display device can be mobile phone, tablet computer, MP3, MP4, smart watch, smart helmet or other wearable devices etc.. Because the display device provided by the utility model embodiment includes the display panel provided by the utility model embodiment, thus also has the same beneficial effect, here no longer repeat.

[0054] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, the steps described in the utility model can be executed in parallel, sequentially or in different order, as long as the desired results of the technical solutions of the utility model can be achieved, which is not limited herein.

[0055] The above specific embodiments do not constitute a limitation on the scope of protection of the utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A display panel, characterized by, The display panel comprises: a liquid crystal cell; a backlight module comprising a diffusion plate, a light guide plate and a reflection plate in sequence away from the liquid crystal cell; the backlight module further comprises a light source, and the light guide plate is used for adjusting the light emitted by the light source into a surface light source; a quarter-wave plate between the liquid crystal cell and the backlight module; a light ray modulation layer at least partially between the quarter-wave plate and the liquid crystal cell, the light ray modulation layer is used for transmitting first linearly polarized light and reflecting second linearly polarized light; the polarization directions of the first linearly polarized light and the second linearly polarized light are perpendicular.

2. The display panel of claim 1, wherein, The light ray modulation layer comprises a multilayer film reflective polarizer, and the multilayer film reflective polarizer is arranged in contact with the liquid crystal cell.

3. The display panel of claim 1, wherein, The light ray modulation layer comprises a metal wire grid polarizer, and the metal wire grid polarizer is arranged in contact with the liquid crystal cell.

4. The display panel of claim 1, wherein, The light ray modulation layer comprises a dual brightness enhancement film and a first polarizer; the dual brightness enhancement film is between the first polarizer and the quarter-wave plate; and the first polarizer is used for transmitting the first linearly polarized light.

5. The display panel of claim 4, wherein, The dual brightness enhancement film comprises a plurality of reflective polarizing layers; the quarter-wave plate is integrated in the dual brightness enhancement film, and at least one of the reflective polarizing layers is between the quarter-wave plate and the first polarizer.

6. The display panel of claim 4, wherein, The display panel further comprises a prism film between the quarter-wave plate and the backlight module.

7. The display panel of claim 1, wherein, The display panel further comprises a second polarizer on a side of the liquid crystal cell away from the backlight module, and the second polarizer is used for transmitting the second linearly polarized light.

8. The display panel of claim 1, wherein, The light source is located on a side of the light guide plate.

9. The display panel of claim 1, wherein, The liquid crystal cell comprises: an array substrate on a side of the light ray modulation layer away from the backlight module; a liquid crystal layer on a side of the array substrate away from the backlight module; a color film substrate on a side of the liquid crystal layer away from the array substrate.

10. A display device, characterized by comprising: The display device comprises the display panel of any one of claims 1-9.

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