Reflective display panel and display device

Abstract

The embodiment of the utility model discloses a reflection type display panel and a display device, the reflection type display panel comprises a liquid crystal box, an auxiliary light source, an auxiliary layer, a bonding layer and a cover plate, the auxiliary layer is located on the light emitting side of the liquid crystal box, the auxiliary light source is located on the side face of the auxiliary layer, and light guide net points are arranged on the surface of the side, away from the liquid crystal box, of the auxiliary layer; the bonding layer is located between the auxiliary layer and the cover plate, and the light guide net points are filled in the bonding layer; wherein the refractive index of the auxiliary layer is different from that of the bonding layer. According to the technical scheme provided by the embodiment of the utility model, the auxiliary layer is adopted to replace the original light guide plate, the refractive index of the auxiliary layer is different from the refractive index of the bonding layer, and after the light guide lattice points on the auxiliary layer are filled with the bonding layer, the refractive indexes of the auxiliary layer and the bonding layer are different. The total reflection light in the auxiliary layer can be normally scattered, refracted and reflected out through the light guide lattice points, so that the problem of failure of the light guide lattice points is avoided.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and in particular to a reflective display panel and display device. Background Technology

[0002] Reflective display panels typically employ a backlight-free design, using ambient light as the light source to achieve display functionality, and offer advantages such as low power consumption and eye protection.

[0003] Currently, by adding a front light source and activating it when ambient light is insufficient, a good display effect can be guaranteed. In existing technologies, a light guide plate is typically used to guide the light emitted by the front light source into the display panel. However, when the light guide plate and the cover plate are bonded together with an adhesive layer, the adhesive layer fills the light guide dots on the light guide plate, causing the light guide dots to malfunction and preventing the light from being guided into the display panel. Utility Model Content

[0004] This utility model provides a reflective display panel and display device to solve the problem of light guide dot failure.

[0005] According to one aspect of the present invention, a reflective display panel is provided, comprising:

[0006] LCD box;

[0007] An auxiliary light source and an auxiliary layer are provided. The auxiliary layer is located on the light-emitting side of the liquid crystal cell, and the auxiliary light source is located on the side of the auxiliary layer. Light guide dots are provided on the surface of the auxiliary layer away from the liquid crystal cell.

[0008] An adhesive layer and a cover plate are provided, wherein the adhesive layer is located between the auxiliary layer and the cover plate, and the adhesive layer is filled with the light guide dots; wherein the refractive index of the auxiliary layer is different from that of the adhesive layer.

[0009] Optionally, the refractive index of the auxiliary layer is greater than that of the adhesive layer.

[0010] Optionally, the thickness of the auxiliary layer is 1.6 μm-2.4 μm.

[0011] Optionally, the liquid crystal cell includes a first substrate, a second substrate, and a liquid crystal layer located between the first substrate and the second substrate, wherein the auxiliary layer is located on the side of the first substrate away from the liquid crystal layer.

[0012] Optionally, the first substrate includes a first substrate and a common electrode, wherein the common electrode is located between the first substrate and the liquid crystal layer;

[0013] The auxiliary light source is fixed to the side of the auxiliary layer and the first substrate.

[0014] Optionally, the refractive index of the auxiliary layer is greater than the refractive index of the first substrate.

[0015] Optionally, the transmittance of the auxiliary layer is greater than or equal to the transmittance of the first substrate.

[0016] Optionally, the liquid crystal layer includes a dye-based liquid crystal; the liquid crystal cell further includes a reflective layer located on the side of the liquid crystal layer away from the first substrate, the reflective layer being used to reflect light passing through the dye-based liquid crystal;

[0017] The first substrate further includes a color resist layer, which is located between the first substrate and the common electrode.

[0018] Optionally, the second substrate includes an array layer and a second substrate, the array layer being located between the second substrate and the liquid crystal layer; the reflective layer being located between the array layer and the second substrate.

[0019] According to another aspect of the present invention, a display device is provided, the display device comprising a reflective display panel provided in any embodiment of the present invention.

[0020] The technical solution provided by this utility model embodiment replaces the original light guide plate with an auxiliary layer. The refractive index of the auxiliary layer is different from that of the adhesive layer. When the adhesive layer fills the light guide dots on the auxiliary layer, the total internal reflection light in the auxiliary layer can be normally dispersed, refracted and reflected out through the light guide dots due to the difference in refractive index between the two, thereby avoiding the problem of light guide dot failure.

[0021] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of a reflective display panel provided in an embodiment of this utility model;

[0024] Figure 2 A schematic diagram of a light transmission path provided for an embodiment of this utility model;

[0025] Figure 3 A schematic diagram of another reflective display panel provided in an embodiment of this utility model;

[0026] Figure 4 A schematic diagram of another light transmission path provided for an embodiment of this utility model;

[0027] Figure 5 A schematic diagram of another reflective display panel provided in an embodiment of this utility model;

[0028] Figure 6 A schematic diagram of another reflective display panel provided in an embodiment of this utility model;

[0029] Wherein, 10-liquid crystal cell; 11-first substrate; 101-first substrate; 102-common electrode; 103-color resist layer; 12-second substrate; 104-second substrate; 105-array layer; 13-liquid crystal layer;

[0030] 20 - Auxiliary light source;

[0031] 30 - Auxiliary layer; 31 - Light guide dots;

[0032] 40 - Adhesive layer; 50 - Cover plate; 60 - Reflective layer. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0035] Figure 1 This is a schematic diagram of the structure of a reflective display panel provided in an embodiment of the present invention, with reference to... Figure 1 The reflective display panel provided in this embodiment includes:

[0036] LCD box 10;

[0037] An auxiliary light source 20 and an auxiliary layer 30 are provided. The auxiliary layer 30 is located on the light-emitting side of the liquid crystal cell 10, and the auxiliary light source 20 is located on the side of the auxiliary layer 30. Light guide dots 31 are provided on the surface of the auxiliary layer 30 away from the liquid crystal cell 10.

[0038] An adhesive layer 40 and a cover plate 50 are provided. The adhesive layer 40 is located between the auxiliary layer 30 and the cover plate 50. The adhesive layer 40 is filled with light guide dots 31. The refractive index of the auxiliary layer 30 is different from that of the adhesive layer 40.

[0039] Specifically, a reflective display panel utilizes the principle of reflection to present images. Ambient light is reflected by the internal structure and directed to the viewer's eye, thus forming an image. From top to bottom, the reflective display panel consists of a cover plate 50, an adhesive layer 40, an auxiliary layer 30, and a liquid crystal cell 10. The cover plate 50 protects the overall structure of the display panel, and the adhesive layer 40 bonds the cover plate 50 to the auxiliary layer 30, ensuring a complete bond. The auxiliary layer 30 guides the light emitted by the auxiliary light source 20 into the liquid crystal cell 10. The auxiliary light source 20 can provide supplementary light to the reflective display panel when the ambient light intensity is low. The auxiliary light source 20 can be an LED.

[0040] Optionally, the adhesive layer 40 can be OCA adhesive. Since the auxiliary layer 30 has light-guiding dots 31, when the cover plate 50 and the auxiliary layer 30 are bonded together by the adhesive layer 40, the adhesive layer 40 will fill into the light-guiding dots 31.

[0041] In the prior art, the refractive index of the adhesive layer 40 is approximately equal to that of the light guide plate. Therefore, the light undergoes total internal reflection within the light guide plate and does not refract out from the dots, thus causing the dots to fail.

[0042] Figure 2 A schematic diagram of a light transmission path provided for an embodiment of this utility model, with reference to... Figure 2 In this embodiment, the refractive index of the auxiliary layer 30 is different from that of the adhesive layer 40. When the adhesive layer 40 fills the light guide dots 31, the light guide dots 31 can still disrupt the total internal reflection of light within the auxiliary layer 30. When light travels from the auxiliary layer 30 to the adhesive layer 40, it can be refracted and reflected from the light guide dots 31 (e.g., ...). Figure 2 (The path is shown by the dashed line in the image).

[0043] The technical solution provided by this utility model embodiment replaces the original light guide plate with an auxiliary layer 30. The refractive index of the auxiliary layer 30 is different from that of the adhesive layer 40. When the adhesive layer 40 fills the light guide dots 31 on the auxiliary layer 30, due to the difference in refractive index between the two, the total internal reflection light in the auxiliary layer 30 can be normally dispersed, refracted and reflected out through the light guide dots 31, thereby avoiding the problem of the light guide dots 31 failing.

[0044] Optionally, in this embodiment, the refractive index of the auxiliary layer 30 is greater than that of the adhesive layer 40. When the adhesive layer 40 fills the light guide dots 31, since the refractive index of the adhesive layer 40 within the light guide dots 31 is lower than that of the auxiliary layer 30, the total internal reflection light within the auxiliary layer 30 can be scattered at the light guide dots 31, disrupting the transmission of the total internal reflection light, thereby enabling the light to be refracted and reflected to the liquid crystal cell 10 below.

[0045] Optionally, the auxiliary layer 30 is made of ITO (Indium Tin Oxides), and the adhesive layer 40 is made of OCA adhesive. The refractive index of OCA adhesive is about 1.47, and the refractive index of ITO is about 1.9. The refractive indexes of the two are significantly different, which makes it easier to disperse the total internal reflection light and improve the uniformity of brightness.

[0046] Optionally, the design depth of the light guide dots 31 is typically 1.8±0.2μm, and the thickness of the auxiliary layer 30 can be set to 1.6μm-2.4μm. While ensuring that the auxiliary layer 30 can produce the light guide dots 31, reducing the thickness of the auxiliary layer 30 helps to reduce the overall thickness of the display panel. The light guide dots 31 can be fabricated on the auxiliary layer 30 using an imprinting device.

[0047] Figure 3 This is a schematic diagram of another reflective display panel provided in an embodiment of the present invention, with reference to... Figure 3 Based on the above embodiments, optionally, the liquid crystal cell 10 includes a first substrate 11, a second substrate 12, and a liquid crystal layer 13 located between the first substrate 11 and the second substrate 12, and an auxiliary layer 30 located on the side of the first substrate 11 away from the liquid crystal layer 13.

[0048] The first substrate 11 includes a first substrate 101 and a common electrode 102, with the common electrode 102 located between the first substrate 101 and the liquid crystal layer 13; the auxiliary light source 20 is fixed to the auxiliary layer 30 and the side of the first substrate 101.

[0049] Specifically, since the auxiliary layer 30 has a small thickness, the auxiliary light source 20 is disposed on the side of the first substrate 101 and the auxiliary layer 30. The first substrate 101 provides support for the auxiliary light source 20, which can better fix the auxiliary light source 20.

[0050] Figure 4 This is a schematic diagram of another light transmission path provided by an embodiment of the present invention, with reference to... Figure 4 Optionally, in this embodiment, the refractive index of the auxiliary layer 30 is greater than that of the first substrate 101, so as to ensure that the total internal reflection light in the auxiliary layer 30 can be refracted into the first substrate 101 and thus enter the liquid crystal layer 13.

[0051] Optionally, the first substrate 101 is typically a glass substrate, and the light transmittance of the auxiliary layer 30 is greater than or equal to the light transmittance of the first substrate 101, resulting in less loss of front light and improving light utilization.

[0052] The technical solution provided by this embodiment of the invention involves forming an ITO film layer on the surface of a first substrate 101, and then fabricating light-guiding dots 31 on the ITO film layer to form an auxiliary layer 30, which replaces the original light guide plate. When the adhesive layer 40 fills into the light-guiding dots 31, since the refractive index of the adhesive layer 40 is less than that of the auxiliary layer 30, the light-guiding dots 31 can effectively disrupt the total internal reflection light within the auxiliary layer 30, allowing the light to be properly guided out (as shown by the dotted line in the figure), effectively avoiding the problem of light-guiding dots 31 failure. Furthermore, the physical properties of ITO do not affect the brightness of the front light, which is beneficial for improving the uniformity of brightness.

[0053] In the prior art, a polarizer is also provided between the light guide plate and the liquid crystal cell 10, but the polarizer will cause light loss (loss rate of about 50%), which reduces the light utilization rate.

[0054] In this embodiment, a dye can be added to the liquid crystal layer 13, and the dichroism of the dye liquid crystal can be used to achieve black-and-white switching, thereby replacing the polarizer and improving light utilization. The dye liquid crystal in the dye liquid crystal layer has an absorption axis and a transmission axis, and it has the characteristics of strong long-axis light absorption and weak short-axis light absorption. The orientation of the dye liquid crystal and its light absorption state can be controlled by an electric field.

[0055] Figure 5 This is a schematic diagram of another reflective display panel provided in an embodiment of the present invention, with reference to... Figure 5 Based on the above embodiments, optionally, the liquid crystal layer 13 includes a dye liquid crystal layer. The liquid crystal cell 10 also includes a reflective layer 60, which is located on the side of the liquid crystal layer 13 away from the first substrate 11, and is used to reflect light passing through the liquid crystal layer 13;

[0056] The second substrate 12 includes an array layer 105 and a second substrate 104, with the array layer 105 located between the second substrate 104 and the liquid crystal layer 13; a reflective layer 60 is located between the array layer 105 and the second substrate 104. The array layer 105 includes a plurality of pixel electrodes and transistors for driving the pixel electrodes. The plurality of pixel electrodes are insulated from each other, and the overlapping area between a pixel electrode and a common electrode 102 corresponds to a pixel region. The dye liquid crystal can be regulated by applying a voltage to the common electrode 102 and the pixel electrodes.

[0057] The first substrate 11 further includes a color resist layer 103, which is located between the first substrate 101 and the common electrode 102. Different colored color resist blocks are spaced apart on the color resist layer 103, with each pixel area corresponding to a color resist block of the same color. Incident light passing through the color resist layer 103 displays light of the corresponding color. The different color resist blocks can be separated by a black matrix.

[0058] Specifically, when a voltage is applied to the common electrode 102 and the corresponding pixel electrode, the alignment of the dye-liquid crystal changes under the influence of the electric field. For example, if the dye-liquid crystal is in an upright position, ambient light can pass through it and be reflected by the reflective layer 60. After being filtered by the color resist layer 103, a color image is displayed. When no voltage is applied between the common electrode 102 and the corresponding pixel electrode, the dye-liquid crystal is in a lying position. Ambient light is absorbed by the dye-liquid crystal after passing through the color resist layer 103, resulting in a black state.

[0059] The technical solution provided by this utility model embodiment, on the one hand, uses dye-based liquid crystal as the liquid crystal layer 13, which can replace the polarizer (the polarizer's thickness is approximately 0.15 mm). Since there is no loss of front light by the polarizer, the utilization rate of front light can be increased from the original 50% to 95%, greatly improving the light utilization rate. On the other hand, using an auxiliary layer 30 (the auxiliary layer's thickness is approximately 2 μm) to replace the original light guide plate (the light guide plate's thickness is approximately 0.4 mm) reduces the overall thickness of the display panel by approximately 0.55 mm, thereby making the display panel thinner and lighter.

[0060] Figure 6 This is a schematic diagram of another reflective display panel provided in an embodiment of the present invention, with reference to... Figure 6 , Figure 6 The reflective display panel shown is Figure 5 The difference between the reflective display panels shown is that, in Figure 6 In this case, the reflective layer 60 is located on the side of the second substrate 104 away from the liquid crystal layer 13, and it can also achieve the reflection function. Its working principle is the same as that of the second substrate 104. Figure 5 The structures shown are the same, so they will not be described again.

[0061] Optionally, this embodiment of the present invention also provides a display device, which includes the reflective display panel provided in any embodiment of the present invention. Therefore, the display device provided in this embodiment also possesses the beneficial effects described in any of the above embodiments. The display device provided in this embodiment can be an e-reader (such as an e-book or e-newspaper), a price tag, or other electronic products such as an outdoor billboard.

[0062] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0063] The specific embodiments described above do not constitute a limitation on the scope of protection of this 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 modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A reflective display panel, characterized by The application relates to a reflective display panel. The reflective display panel comprises a liquid crystal cell, an auxiliary light source and an auxiliary layer, the auxiliary layer is located on the light-emitting side of the liquid crystal cell, the auxiliary light source is located on the side of the auxiliary layer, and the auxiliary layer is provided with light guide dots on the surface far from the liquid crystal cell; a bonding layer and a cover plate are arranged between the auxiliary layer and the cover plate, and the bonding layer fills the light guide dots; wherein the refractive index of the auxiliary layer is different from the refractive index of the bonding layer. The refractive index of the auxiliary layer is greater than the refractive index of the bonding layer. The thickness of the auxiliary layer is 1.6-2.4 mu m.

2. The reflective display panel of claim 1, wherein, The liquid crystal cell comprises a first substrate, a second substrate and a liquid crystal layer between the first substrate and the second substrate, and the auxiliary layer is located on the side of the first substrate far from the liquid crystal layer.

3. The reflective display panel of claim 1, wherein, The first substrate comprises a first substrate and a common electrode, and the common electrode is located between the first substrate and the liquid crystal layer.

4. The reflective display panel of claim 1, wherein, The auxiliary light source is fixed on the side of the auxiliary layer and the first substrate.

5. The reflective display panel of claim 4, wherein, The refractive index of the auxiliary layer is greater than the refractive index of the first substrate. The light transmittance of the auxiliary layer is greater than or equal to the light transmittance of the first substrate.

6. The reflective display panel of claim 5, wherein, The liquid crystal layer comprises dye liquid crystal.

7. The reflective display panel of claim 5, wherein, The liquid crystal cell further comprises a reflective layer, the reflective layer is located on the side of the liquid crystal layer far from the first substrate, and the reflective layer is used for reflecting light passing through the dye liquid crystal.

8. The reflective display panel of claim 5, wherein, The first substrate further comprises a color resistance layer, and the color resistance layer is located between the first substrate and the common electrode. The second substrate comprises an array layer and a second substrate, and the array layer is located between the second substrate and the liquid crystal layer. The reflective layer is located between the array layer and the second substrate.

9. The reflective display panel of claim 8, wherein, The reflective display panel comprises the reflective display panel of any one of claims 1-9. ​ 10. A display device, characterized by comprising: ​

Images