Display device
By introducing the first polarization module and the air gap layer into the display device, the problem of stray light generated by the reflective display when there is insufficient ambient light is solved, and good optical efficiency and contrast are achieved.
Patent Information
- Application Number
- CN202311324926.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-13
- Publication Date
- 2025-04-15
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
When existing reflective displays are insufficient ambient light, the light traveling in the light guide plate may cause stray light to occur, causing design troubles, energy loss and image contrast reduction problems.
By introducing a first polarization module, including a first polarizer and a first quarter wave plate, the configuration of the first air gap layer is used to refract most of the light rays to the reflective display unit, reducing the generation of stray light, and absorbing the energy of stray light and ambient light through the first polarization module to maintain good contrast.
The good optical efficiency and contrast of the display device are achieved, the generation of stray light is reduced, and the clarity and usage effect of the image are improved.
Smart Images
Figure CN119828378A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an electronic device, and in particular to a display device. Background Art
[0002] In the prior art, electronic paper displays or reflective displays can use ambient light to illuminate the display layer of the display to achieve the purpose of display, so there is no need for a backlight source, which can save power consumption. In order to expand the scope of application so that the reflective display can be used in conditions where the ambient light is insufficient, a front light module having a light guide plate and a light source is generally arranged above the front panel of the above-mentioned display, so that the light emitted by the light source can travel in the light guide plate in a total internal reflection manner, and the light is transmitted toward the display through a microstructure arranged on the surface of the light guide plate, converting the light source into a surface light source with uniform optical distribution. The light transmitted to the display can then be reflected by the display and transmitted to the viewer. The purpose of setting up the front light module is to allow the above-mentioned display to provide sufficient incident light even in places where the ambient light is insufficient, so that the user can view the display screen.
[0003] However, part of the light traveling in the light guide plate may penetrate the light guide plate and directly transmit to the user to form stray light instead of transmitting to the display. In this way, the generation of stray light will cause design problems and energy loss of the light guide plate, and the contrast of the image displayed by the display will also decrease.
[0004] The "background technology" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "background technology" section may contain some prior art that is not known to those skilled in the art. The content disclosed in the "background technology" section does not mean that the content or the problem to be solved by one or more embodiments of the present invention has been known or recognized by those skilled in the art before the application of the present invention. Summary of the invention
[0005] The invention provides a display device having good optical efficiency and contrast.
[0006] To achieve one or part or all of the above purposes or other purposes, one embodiment of the present invention provides a display device. The display device includes a front light module, a first polarizing module and a reflective display unit. The front light module includes a light guide plate and a light source, and the light source is arranged on the light incident surface of the light guide plate. The first polarizing module includes a first polarizer and a first quarter wave plate, wherein the first quarter wave plate is located between the light guide plate and the first polarizer, and a first air gap layer is provided between the light guide plate and the first quarter wave plate. The light guide plate is located between the first polarizing module and the reflective display unit.
[0007] Based on the above, in a display device of an embodiment of the present invention, through the configuration of the first air gap layer, most of the light traveling in the light guide plate can be smoothly refracted to be incident on the reflective display unit, so that the display device has good optical efficiency. In addition, the energy of stray light formed by the light guide plate of the front light module of the display device and the energy of ambient light reflected on the surface of the light guide plate can be absorbed by the first polarizing module, so that the display device can maintain a good contrast.
[0008] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 is a block diagram of a display device according to an embodiment of the present invention.
[0010] Figure 2 yes Figure 1 A schematic structural diagram of a display device.
[0011] Figure 3 yes Figure 2 Schematic diagram of the light path of an illumination light beam from a light source reflected on different interfaces in a display device.
[0012] FIG. 4A to FIG. 4C is the ambient light incident on Figure 2 Schematic diagram of the light path that occurs when reflecting on different interfaces when using a display device.
[0013] Figure 5A yes Figure 2 Another optical path schematic diagram of an illumination light beam of a light source being reflected on different interfaces in a display device.
[0014] Figure 5B is the ambient light incident on Figure 2 Another schematic diagram of the light path in which reflection occurs on different interfaces when using a display device.
[0015] Figure 6 yes Figure 1 A schematic structural diagram of another display device.
[0016] Reference numerals list
[0017] 100: Display device
[0018] 110: Front light module
[0019] 111: Light Source
[0020] 112: Light guide plate
[0021] 120: First polarization module
[0022] 121: First polarizer
[0023] 122: The first quarter wave plate
[0024] 130: Reflective LCD panel
[0025] 140: Second polarization module
[0026] 141: Second polarizer
[0027] 142: Second quarter wave plate
[0028] 530: Electrophoretic display panel
[0029] CR: Cover
[0030] E: Light-emitting element
[0031] EL: Ambient Light
[0032] GP1: First air gap layer
[0033] GP2: Second air gap layer
[0034] IL: Illumination beam
[0035] IM: Image Beam
[0036] IS: incident light surface
[0037] MS: Optical Microstructures
[0038] OA: Optical Adhesive Layer
[0039] RDU: Reflective Display Unit
[0040] S1: First surface
[0041] S2: Second surface. DETAILED DESCRIPTION
[0042] The above and other technical contents, features and effects of the present invention are clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms (e.g., up, down, left, right, front or back, etc.) mentioned in the following embodiments are only the directions with reference to the attached drawings. Therefore, the directional terms used are used for explanation and not for limiting the present invention.
[0043] Figure 1 Schematic diagram of the structure of the display device of the embodiment of the present invention. Figure 1 In this embodiment, the display device 100 includes a front light module 110, a first polarizing module 120, and a reflective display unit RDU. Figure 1As shown, in this embodiment, the front light module 110 includes a light guide plate 112 and a light source 111. The light source 111 is used to provide an illumination beam IL, wherein the light guide plate 112 is located on the transmission path of the illumination beam IL.
[0044] And, if Figure 1 As shown, in this embodiment, the first polarizing module 120 includes a first polarizer 121 and a first quarter-wave plate 122, wherein the first quarter-wave plate 122 is located between the light guide plate 112 and the first polarizer 121, the light guide plate 112 is located between the first polarizing module 120 and the reflective display unit RDU, and a first air gap layer GP1 is provided between the light guide plate 112 and the first quarter-wave plate 122.
[0045] Thus, through the configuration of the first air gap layer GP1, most of the illumination light beam IL traveling in the light guide plate 112 can be smoothly transmitted to the reflective display unit RDU, and form an image light beam IM after being reflected by the reflective display unit RDU, so that the display device 100 can have good optical efficiency. In addition, the energy of the stray light formed by the display device 100 directly transmitted from the light guide plate 112 of the front light module 110 of the display device 100 and the energy of the ambient light reflected on the surface of the light guide plate 112 can be absorbed by the first polarizing module 120, so that the display device 100 can maintain a good contrast. Figures 2 to 6 Provide further explanation.
[0046] Figure 2 yes Figure 1 A structural schematic diagram of a display device. Figure 3 yes Figure 2 Schematic diagram of the light path of an illumination light beam from a light source reflected on different interfaces in a display device. FIG. 4A to FIG. 4C is the ambient light incident on Figure 2 Schematic diagram of the light path reflected on different interfaces when the display device is used. Specifically, Figure 2As shown, in the present embodiment, the light guide plate 112 has a first surface S1 and a second surface S2 opposite to each other and a light incident surface IS. The light source 111 is disposed next to the light incident surface IS of the light guide plate 112. For example, in the present embodiment, the light source 111 may include a plurality of light emitting elements E, and the light emitting elements E may be light emitting diodes (LEDs), sub-millimeter light emitting diodes (mini LEDs) or micro light emitting diodes (micro LEDs) and other types of light emitting elements, so as to be used to provide the illumination light beam IL. In addition, the first surface S1 of the light guide plate 112 is located on a side of the light guide plate 112 close to the first polarizing module 120, that is, the first air gap layer GP1 is between the first surface S1 of the light guide plate 112 and the first polarizing module 120, and the first surface S1 of the light guide plate 112 is provided with a plurality of optical microstructures MS, and the optical microstructures MS are, for example, recessed microstructures that are recessed from the first surface S1 into the light guide plate 112.
[0047] So, like Figure 3 As shown, in this embodiment, through the configuration of the first air gap layer GP1, when the illumination light beam IL emitted by the light source 111 enters the light guide plate 112 through the light incident surface IS of the light guide plate 112, it can easily travel in the light guide plate 112 in a total internal reflection manner, and when the illumination light beam IL is transmitted to the optical microstructure MS, the illumination light beam IL can be transmitted to the direction of the reflective display unit RDU through the optical microstructure MS and formed into an image light beam IM after being reflected by the reflective display unit RDU, and the image light beam IM is then transmitted through the light guide plate 112 and the first polarizing module 120, so as to be transmitted out of the display device 100. In addition, the display device 100 can optionally include a cover CR, which is located on the first polarizer 121 of the first polarizing module 120 (that is, the first polarizer 121 is located between the cover CR and the first quarter wave plate 122), so as to protect the first polarizer 121 from damage.
[0048] And, if Figures 2 to 4CAs shown, in this embodiment, the reflective display unit RDU includes a reflective liquid crystal display panel 130 and a second polarizing module 140. Specifically, in this embodiment, the second polarizing module 140 is located between the reflective liquid crystal display panel 130 and the light guide plate 112, wherein the second polarizing module 140 includes a second polarizer 141 and a second quarter wave plate 142, wherein the second polarizer 141 is located between the reflective liquid crystal display panel 130 and the second quarter wave plate 142. In addition, in this embodiment, the display device 100 further includes an optical adhesive layer OA, which is attached between the light guide plate 112 and the second quarter wave plate 142, and the projection area of the optical adhesive layer OA on the second surface S2 of the light guide plate 112, for example, accounts for more than 80% of the second surface S2 of the light guide plate 112. In this way, since the difference in refractive index between the optical adhesive layer OA and the light guide plate 112 is small, the total internal reflection at the interface between the optical adhesive layer OA and the light guide plate 112 can be reduced.
[0049] Further, in the present embodiment, the absorption axis of the second polarizer 141 is orthogonal to the absorption axis of the first polarizer 121, and the optical axis of the first quarter wave plate 122 is parallel to the optical axis of the second quarter wave plate 142. In addition, in the present embodiment, the angle between the optical axis of the first quarter wave plate 122 and the absorption axis of the first polarizer 121 is, for example, 45 degrees or 135 degrees. In this way, when the light without a specific polarization state passes through the first polarizer 121, it can be formed into a light with only a first linear polarization state, and when the light without a specific polarization state passes through the second polarizer 141, it can be formed into a light with only a second linear polarization state, and the polarization direction of the first linear polarization state is perpendicular to the polarization direction of the second linear polarization state. On the other hand, when the light having only the first linear polarization state passes through the first quarter wave plate 122 or the second quarter wave plate 142, it will be formed into the light having the first circular polarization state, and when the light having the first circular polarization state passes through the first quarter wave plate 122 or the second quarter wave plate 142 again, it will be formed into the light having the second linear polarization state.
[0050] So, like Figure 3As shown, in this embodiment, a part of the illumination light beam IL without a specific polarization state is not reflected by the reflective liquid crystal display panel 130 and directly passes through the light guide plate 112 and then directly transmits out of the display device 100 to form stray light, or another part of the illumination light beam IL without a specific polarization state is reflected when it is transmitted to the second quarter wave plate 142 and then transmitted out of the display device 100 to form stray light. After passing through the first polarizer 121 of the first polarization module 120, more than half of the energy of these stray lights (light beams not transmitted to the reflective liquid crystal display panel 130) is absorbed by the first polarizer 121 to form light with only the first linear polarization state. In this way, the brightness of the stray light can be effectively reduced, thereby improving the contrast of the display device 100.
[0051] In addition, if Figure 3 As shown, for the illumination light beam IL transmitted from the light guide plate 112 and transmitted toward the reflective liquid crystal display panel 130, since the illumination light beam IL without a specific polarization state can be formed into a light beam having only a second linear polarization state after passing through the second polarizer 141, and forms an image light beam IM after being reflected by the reflective liquid crystal display panel 130, the image light beam IM is still a light beam having only a second linear polarization state. After the image light beam IM having the second linear polarization state passes through the second quarter wave plate 142 and the first quarter wave plate 122 successively, the polarization state of the image light beam IM is converted from the original second linear polarization state to the second circular polarization state and then to the first linear polarization state (i.e., the polarization direction of the light beam is perpendicular to the absorption axis of the first polarizer 121), so that the image light beam IM can smoothly pass through the first polarizer 121 and be viewed by the user.
[0052] On the other hand, Figure 4A As shown, the ambient light EL without a specific polarization state can be formed into a light having only a first linear polarization state after passing through the first polarizer 121 of the first polarization module 120, and the polarization state of the ambient light EL will be converted from the first linear polarization state to the first circular polarization state and then to the second linear polarization state after passing through the first quarter wave plate 122 and the second quarter wave plate 142 successively, so that it can smoothly pass through the second polarizer 141 and be transmitted to the reflective liquid crystal display panel 130. In addition, the ambient light EL transmitted to the reflective liquid crystal display panel 130 can form an image beam IM after being reflected by the reflective liquid crystal display panel 130. Similarly, after the image beam IM having the second linear polarization state passes through the second polarizer 141, the second quarter wave plate 142 and the first quarter wave plate 122 successively, the polarization state of the image beam IM will be converted from the second linear polarization state to the second circular polarization state and then to the first linear polarization state in sequence, so that it can smoothly pass through the first polarizer 121.
[0053] And, if Figure 4B and Figure 4CAs shown, the ambient light EL without a specific polarization state will form a first circular polarization state after passing through the first polarizer 121 and the first quarter wave plate 122 of the first polarization module 120 successively, and a part of the ambient light EL with the first circular polarization state may be reflected by the light guide plate 112 or the second quarter wave plate 142 to form stray light, and these stray lights are reflected by the light guide plate 112 or the second quarter wave plate 142, and then converted into a second linear polarization state when passing through the first quarter wave plate 122 again. At this time, the ambient light EL with the second linear polarization state will be absorbed by the first polarizer 121. In this way, the brightness of the stray light formed by the ambient light EL can be effectively reduced, thereby improving the contrast of the display device 100.
[0054] Furthermore, in order to prevent the illumination light beam IL or the ambient light EL having a specific polarization state from being depolarized during transmission through the light guide plate 112, the in-plane phase delay of the light guide plate 112 needs to be less than a certain level. For example, in the present embodiment, the in-plane phase delay of the light guide plate 112 is less than 50 nanometers. In this way, it is ensured that the illumination light beam IL or the ambient light EL has a specific polarization state during transmission through the light guide plate 112, thereby maintaining good functionality of the display device 100.
[0055] In addition, in this embodiment, the first quarter wave plate 122 of the first polarizing module 120 may be a reverse wavelength dispersion material, or the first quarter wave plate 122 is composed of a quarter wave plate and a half wave plate, both of which are positive wavelength dispersion materials. In this way, the first quarter wave plate 122 can produce the characteristics of a reverse wavelength dispersion material, so that the difference in the phase delay amount of the quarter wave plate 122 to light beams of different wavelengths can be further reduced. In this way, by controlling the in-plane phase delay amount of the first polarizing plate 121 and the first quarter wave plate 122 of the first polarizing module 120 and the angle between the optical axis of the first quarter wave plate 122 and the absorption axis of the first polarizing plate 121, the first polarizing module 120 can have the effect of reverse wavelength dispersion characteristics, thereby reducing the formation of astigmatism, and thus making the display device 100 have good optical efficiency.
[0056] On the other hand, similarly, in this embodiment, the second quarter wave plate 142 of the second polarizing module 140 may also be a reverse wavelength dispersion material, or the second quarter wave plate 142 is composed of a quarter wave plate and a half wave plate, both of which are positive wavelength dispersion materials, so that the second quarter wave plate 142 can produce the characteristics of a reverse wavelength dispersion material. In addition, by controlling the in-plane phase delay of the second polarizing plate 141 and the second quarter wave plate 142 and the angle between the optical axis of the second quarter wave plate 142 and the absorption axis of the second polarizing plate 141, the second polarizing module 140 can have the effect of reverse wavelength dispersion characteristics, thereby reducing the formation of astigmatism, and thus making the display device 100 have good optical efficiency.
[0057] On the other hand, in order to prevent the light guide plate 112 and the first polarizing module 120 from being too close to each other and thus causing Newton rings or poor wetting, the display device 100 may set a spacer in the first air gap layer GP1, and the spacer is set on the surface of the first quarter-wave plate 122 facing the light guide plate 112, thereby being able to present a good image.
[0058] In addition, in the aforementioned embodiment, although the optical adhesive layer OA is used to bond the light guide plate 112 and the second quarter wave plate 142, the present invention is not limited thereto. In other embodiments, the optical adhesive layer OA may not be provided, and a second air gap layer GP2 may be provided between the light guide plate 112 and the second quarter wave plate 142. At this time, in order to avoid the light guide plate 112 and the second polarizing module 140 being too close to each other to produce Newton rings or poor wetting, the display device 100 may also be provided with a spacer in the second air gap layer GP2, and the spacer is provided on at least one of the surfaces of the second quarter wave plate 142 and the light guide plate 112 facing each other. In this way, the display device 100 can also realize the aforementioned functions, thereby achieving the aforementioned effects and advantages, which will not be repeated here.
[0059] In addition, in the aforementioned embodiment, although the absorption axis of the second polarizer 141 is orthogonal to the absorption axis of the first polarizer 121, and the optical axis of the first quarter wave plate 122 is parallel to the optical axis of the second quarter wave plate 142, the present invention is not limited thereto. In other embodiments, the absorption axis of the second polarizer 141 may also be parallel to the absorption axis of the first polarizer 121, and the optical axis of the first quarter wave plate 122 is orthogonal to the optical axis of the second quarter wave plate 142, and the display device 100 may also realize the aforementioned functions, thereby achieving the aforementioned effects and advantages. Figure 5A and Figure 5B For further explanation.
[0060] Figure 5A yes Figure 2 Schematic diagram of the light path of an illumination light beam from a light source reflected on different interfaces in a display device. Figure 5B is the ambient light incident on Figure 2 Schematic diagram of the light path reflected on different interfaces when the display device is used. Further, in this embodiment, since the absorption axis of the second polarizer 141 is parallel to the absorption axis of the first polarizer 121, and the optical axis of the first quarter wave plate 122 is orthogonal to the optical axis of the second quarter wave plate 142, when the light without a specific polarization state passes through the first polarizer 121 or the second polarizer 141, it will be formed into a light with only the same first linear polarization state. On the other hand, when the light with only the first linear polarization state passes through the first quarter wave plate 122, it will be formed into a light with a first circular polarization state, and after passing through the second quarter wave plate 142, it will be formed into a light with a second circular polarization state different from the first circular polarization state. When the light with the first linear polarization state passes through the first quarter wave plate 122 and then passes through the second quarter wave plate 142, it will be formed into a light still having the first linear polarization state.
[0061] So, like Figure 5A As shown, in this embodiment, a part of the illumination light beam IL without a specific polarization state is not reflected by the reflective liquid crystal display panel 130 and directly transmitted out of the display device 100 after penetrating the light guide plate 112 to form stray light, or another part of the illumination light beam IL without a specific polarization state is reflected when transmitted to the second quarter wave plate 142 and transmitted out of the display device 100 to form stray light. After passing through the first polarizer 121 of the first polarization module 120, more than half of the energy of these stray lights (light beams not transmitted to the reflective liquid crystal display panel 130) is absorbed by the first polarizer 121 to form light with only the first linear polarization state. In this way, the brightness of the stray light can be effectively reduced, thereby improving the contrast of the display device 100.
[0062] In addition, if Figure 5A As shown, for the illumination light beam IL transmitted from the light guide plate 112 and transmitted toward the reflective liquid crystal display panel 130, since the illumination light beam IL without a specific polarization state can be formed into a light beam having only a first linear polarization state after passing through the second polarizer 141, and after being reflected by the reflective liquid crystal display panel 130, an image light beam IM is formed, and the image light beam IM is still a light beam having only a first linear polarization state. After the image light beam IM having the first linear polarization state passes through the second quarter wave plate 142 and the first quarter wave plate 122 successively, the polarization state of the image light beam IM is converted from the original first linear polarization state to the first circular polarization state and then to the first linear polarization state, so that the image light beam IM can smoothly pass through the first polarizer 121 and be viewed by the user.
[0063] On the other hand, Figure 5B As shown, after the ambient light EL without a specific polarization state passes through the first polarizer 121 of the first polarization module 120, it can be formed into a light having only a first linear polarization state, and after passing through the first quarter wave plate 122 and the second quarter wave plate 142 in sequence, the polarization state of the ambient light EL will be converted from the first linear polarization state to the first circular polarization state and then to the first linear polarization state, so that it can smoothly pass through the second polarizer 141 and then be transmitted to the reflective liquid crystal display panel 130. In addition, the ambient light EL transmitted to the reflective liquid crystal display panel 130 can form an image beam IM after being reflected by the reflective liquid crystal display panel 130. Similarly, after the image beam IM having a first linear polarization state passes through the second polarizer 141, the second quarter wave plate 142 and the first quarter wave plate 122 in sequence, the polarization state of the image beam IM will be converted from the first linear polarization state to the first circular polarization state and then to the first linear polarization state in sequence, so that it can smoothly pass through the first polarizer 121 and then penetrate the cover CR to form an image screen.
[0064] Furthermore, in this embodiment, a portion of the ambient light EL is reflected by the light guide plate 112 or the second quarter wave plate 142 with a polarization state different from that of the ambient light EL. Figure 4B and Figure 4C The situation shown is the same and will not be repeated here.
[0065] In this way, the display device 100 can also realize the aforementioned functions, thereby achieving the aforementioned effects and advantages, which will not be elaborated herein.
[0066] Figure 6 yes Figure 1 In this embodiment, the reflective display unit RDU of the display device 100 is an electrophoretic display panel 530, and the second polarizing module 140 is not provided, and the optical adhesive layer OA is attached between the light guide plate 112 and the electrophoretic display panel 530. In this way, the brightness of the stray light generated by the illumination beam and the brightness of the stray light generated by the ambient beam can also be effectively reduced.
[0067] In summary, in a display device of one embodiment of the present invention, the energy of stray light formed by the light guide plate of the front light module of the display device and the energy of ambient light reflected on the surface of the light guide plate can be absorbed by the first polarizing module, so that the display device can maintain a good contrast.
[0068] The above description is only a preferred embodiment of the present invention, and it cannot be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes and modifications made in accordance with the claims of the present invention and the specification of the present invention are still within the scope of the patent of the present invention. In addition, any embodiment or claim of the present invention is not required to achieve all the purposes, advantages or features disclosed in the present invention. In addition, the abstract of the specification and the name of the invention are only used to assist in the retrieval of patent documents, and are not used to limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name the name of the element or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.
Claims
1. A display device, characterized in that: The display device comprises a front light module, a first polarizing module and a reflective display unit, wherein: The front light module includes a light guide plate and a light source, and the light source is arranged on the light incident surface of the light guide plate; The first polarization module includes a first polarizer and a first quarter wave plate, wherein the first quarter wave plate is located between the light guide plate and the first polarizer, and a first air gap layer is provided between the light guide plate and the first quarter wave plate; The light guide plate is located between the first polarizing module and the reflective display unit.
2. The display device according to claim 1, characterized in that The in-plane phase delay of the light guide plate is less than 50 nanometers.
3. The display device according to claim 1, characterized in that The angle between the optical axis of the first quarter wave plate and the absorption axis of the first polarizer is 45 degrees.
4. The display device according to claim 1, characterized in that The first quarter wave plate is made of inverse wavelength dispersion material.
5. The display device according to claim 1, characterized in that The first quarter wave plate is composed of a quarter wave plate and a half wave plate, both of which are made of positive wavelength dispersion materials.
6. The display device according to claim 1, characterized in that: The reflective display unit is an electrophoretic display panel, and the display device further includes an optical adhesive layer, which is attached between the light guide plate and the electrophoretic display panel.
7. The display device according to claim 1, characterized in that: The reflective display unit includes a reflective liquid crystal display panel and a second polarizing module. The second polarizing module is located between the reflective liquid crystal display panel and the light guide plate. The second polarizing module includes a second polarizer and a second quarter wave plate. The second polarizer is located between the reflective liquid crystal display panel and the second quarter wave plate.
8. The display device according to claim 7, characterized in that: The display device further includes an optical adhesive layer, and the optical adhesive layer is attached between the light guide plate and the second quarter wave plate.
9. The display device according to claim 7, characterized in that: The absorption axis of the second polarizer is parallel to the absorption axis of the first polarizer, and the optical axis of the first quarter wave plate is orthogonal to the optical axis of the second quarter wave plate.
10. The display device according to claim 7, characterized in that: The absorption axis of the second polarizer is orthogonal to the absorption axis of the first polarizer, and the optical axis of the first quarter wave plate is parallel to the optical axis of the second quarter wave plate.
11. The display device according to claim 7, characterized in that: The second quarter wave plate is made of reverse wavelength dispersion material.
12. The display device according to claim 7, characterized in that: The second quarter wave plate is composed of a quarter wave plate and a half wave plate, both of which are made of positive wavelength dispersion materials.