Backlight module, display panel and display device

Abstract

The utility model discloses an embodiment of backlight unit, display panel and display device. This backlight unit is applied to the half -and -half reflection type display panel, and the backlight unit includes light emitting module, light processing layer and backboard, light processing layer sets up on the backboard, and light emitting module sets up in the light processing layer along the horizontal direction one side, light emitting module can provide light in the case where the ambient light is insufficient, and light processing layer can reflect or scatter the light that enters under the control of electric field. The backlight unit of the scheme can solve the problem of insufficient and non-uniform emission light of the half -and -half reflection type liquid crystal box, improve the emission light quantity and the uniformity of the emission light of the display panel, and further improve the effect of display panel display picture.

Description

Technical Field

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

[0002] Reflective panels cannot display images in low-light conditions, and a front light panel is usually added to the reflective LCD module of the reflective panel to provide additional light. However, the design requirements for adding a front light panel to the reflective LCD module of a reflective panel are very high. Currently, it is not possible to guarantee a good display effect for the reflective panel (e.g., the displayed image should not appear washed out and the contrast should be high) while the front light panel provides sufficient brightness. Utility Model Content

[0003] This utility model provides a backlight module, a display panel, and a display device to improve the display effect of a transflective display panel.

[0004] In a first aspect, this utility model provides a backlight module, which is applied to a semi-transparent and semi-reflective display panel. The backlight module includes a light-emitting module, a light processing layer, and a back plate.

[0005] The light processing layer is disposed on the back plate, and the light-emitting module is disposed on one side of the light processing layer along the horizontal direction;

[0006] The light-emitting module can provide light when there is insufficient ambient light, and the light processing layer can reflect or scatter the incoming light.

[0007] Optionally, the light processing layer includes a dual-state liquid crystal layer, a light guide layer, and a reflective layer;

[0008] The reflective layer is disposed on one side of the back panel, the light guide layer is disposed on the side of the reflective layer away from the back panel, and the dual-state liquid crystal layer is disposed on the side of the light guide layer away from the reflective layer.

[0009] Optionally, the light-emitting module is disposed on one side of the light guide layer along the horizontal direction.

[0010] Optionally, the backlight module further includes a control module;

[0011] Both the light-emitting module and the dual-state liquid crystal layer are connected to the control module. The control module can control the light-emitting module to emit light and control the dual-state liquid crystal layer to adjust to a transparent state or a scattering state.

[0012] Optionally, the reflective layer includes a metallic reflective film or a mirror coating.

[0013] Optionally, the light-emitting module includes multiple LED beads or LED strings.

[0014] Optionally, the dual-state liquid crystal layer comprises a polymer-dispersed liquid crystal film.

[0015] Secondly, this utility model embodiment also provides a display panel, which includes a backlight module and a semi-transparent and semi-reflective liquid crystal cell provided in any embodiment of this utility model;

[0016] The semi-transmissive and semi-reflective liquid crystal cell is disposed on the side of the light processing layer away from the back plate.

[0017] Optionally, the transflective liquid crystal cell includes a transflective layer;

[0018] The semi-transparent and semi-reflective layer can transmit some of the incoming light and reflect some of the incoming light.

[0019] Thirdly, the present invention also provides a display device, which includes the display panel provided in any embodiment of the present invention.

[0020] The backlight module of this embodiment, applied to a transflective display panel, uses a light processing layer to scatter and convert the point or line light source generated by the light-emitting module into a surface light source when ambient light is insufficient, thus providing uniform illumination to the transflective liquid crystal cell. When ambient light is sufficient, it fully reflects the natural light passing through the transflective liquid crystal cell, compensating for the insufficient reflectivity and uneven reflected light of the transflective liquid crystal cell. Therefore, the backlight module solves the problems of insufficient and uneven emitted light from the transflective liquid crystal cell, increasing the amount and uniformity of emitted light from the transflective display panel, thereby improving the display effect of the transflective display panel. Attached Figure Description

[0021] 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.

[0022] Figure 1 A schematic diagram of the structure of a reflective panel provided by the prior art;

[0023] Figure 2 A display effect diagram of a reflective panel without a front light panel provided for the prior art;

[0024] Figure 3 A display effect diagram of a reflective panel equipped with a front light plate, provided for the prior art;

[0025] Figure 4 A schematic diagram of the structure of a backlight module provided in an embodiment of this utility model;

[0026] Figure 5 This is a schematic diagram of another backlight module provided in an embodiment of the present utility model;

[0027] Figure 6 A schematic diagram of the structure of a display panel provided in an embodiment of this utility model;

[0028] Figure 7 A schematic diagram of the optical path of a display panel under strong light is provided for an embodiment of this utility model;

[0029] Figure 8 This is a schematic diagram of the optical path of a display panel under low light conditions, provided as an embodiment of the present invention. Detailed Implementation

[0030] 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.

[0031] 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; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] Figure 1 A schematic diagram of a reflective panel provided for the present technology. Figure 2 This image illustrates the display effect of a reflective panel without a front light panel, based on existing technology. Figure 3 This is a display effect diagram of a reflective panel equipped with a front light plate, provided for existing technology. According to... Figure 1It is known that the reflective panel includes a fully polarized film 210 and a fully reflective liquid crystal 220. The polarized film 210 is disposed on the display surface of the fully reflective liquid crystal 220, and the reflective layer 221 included in the fully reflective liquid crystal 220 can reflect all light incident on the panel. According to Figure 2 It is known that in low ambient light conditions, the image displayed by a reflective panel without a front light panel is relatively dark, causing the image on the reflective panel to fail to display; according to Figure 3 It is known that when a reflective panel provides brightness from the front light panel, the displayed image will appear washed out, reducing the contrast of the displayed image and resulting in a poor display effect.

[0033] Figure 4 A schematic diagram of the structure of a backlight module provided in an embodiment of this utility model is shown below. Figure 4 As shown, the backlight module includes a light-emitting module 111, a light processing layer 112, and a backplate 113;

[0034] The light processing layer 112 is disposed on the back plate 113, and the light-emitting module 111 is disposed on one side of the light processing layer 112 along the horizontal direction; the light-emitting module 111 can provide light when the ambient light is insufficient, and the light processing layer 112 can reflect or scatter the incident light.

[0035] The transflective display panel includes a transflective liquid crystal cell 120 and a backlight module 110. It can accommodate both "reflective ambient light display" and "transmissive backlight display." When backlighting is not required, it can utilize ambient light for energy-saving display; in dark environments, it can activate the backlight for clear display. The backlight module 110 can reflect incident light when ambient light is sufficient, compensating for the insufficient reflectivity and uneven reflection of the transflective liquid crystal cell 120, thereby enhancing the emitted light and improving its uniformity. When ambient light is insufficient, the backlight module 110 can generate sufficient light and evenly guide it into the transflective liquid crystal cell 120, providing uniform supplemental lighting.

[0036] Specifically, the light processing layer 112 can adjust its function according to the amount of ambient light. When the ambient light is sufficient, the light processing layer 112 functions as a strong reflector, which can fully reflect the natural light passing through the transflective liquid crystal cell 120 to assist the transflective liquid crystal cell 120 in reflecting the transmitted light, thereby compensating for the insufficient reflectivity and uneven reflected light caused by the transmission of the transflective liquid crystal cell 120, and improving the light output and uniformity of the transflective liquid crystal cell 120. When the ambient light is insufficient, the light processing layer 112 functions as a surface light source, which converts the point light source or line light source generated by the light-emitting module 111 into a surface light source. That is, it scatters the light emitted by the light-emitting module 111 and guides the light to be emitted evenly, forming a bright surface light source, providing uniform backlight for the transflective liquid crystal cell 120, and improving the light output and uniformity of the transflective liquid crystal cell 120.

[0037] The backlight module of this embodiment, applied to a transflective display panel, uses a light processing layer 112 to scatter and convert the point or line light source generated by the light-emitting module 111 into a surface light source when ambient light is insufficient, thereby providing uniform supplemental lighting to the transflective liquid crystal cell 120. When ambient light is sufficient, it fully reflects the natural light transmitted through the transflective liquid crystal cell 120, compensating for the insufficient reflectivity and uneven reflected light of the transflective liquid crystal cell 120. Therefore, the backlight module 110 can solve the problems of insufficient and uneven emitted light from the transflective liquid crystal cell 120, increasing the amount and uniformity of emitted light from the transflective display panel, and thus improving the display effect of the transflective display panel.

[0038] Optionally, based on the above embodiments, Figure 5 This is a schematic diagram of another backlight module provided in an embodiment of the present invention. Figure 5 As shown, the light processing layer 112 includes a dual-state liquid crystal layer 1121, a light guide layer 1122, and a reflective layer 1123;

[0039] A reflective layer 1123 is disposed on one side of the back panel 113, a light guide layer 1122 is disposed on the side of the reflective layer 1123 away from the back panel 113, and a dual-state liquid crystal layer 1121 is disposed on the side of the light guide layer 1122 away from the reflective layer 1123. A light-emitting module 111 is disposed on the side of the light guide layer 1122 along the horizontal direction.

[0040] The dual-state liquid crystal layer 1121 can change its optical properties under the control of an electric field. For example, in the absence of an electric field, the dual-state liquid crystal layer 1121 is in a scattering state, where the refractive index of the liquid crystal droplets does not match that of the polymer matrix, causing light to be scattered and the material to appear opaque and milky white. Under an electric field, the dual-state liquid crystal layer 1121 is in a transparent state, where the liquid crystal molecules are oriented and aligned under the influence of the electric field. When the effective refractive index of the liquid crystal droplets is close to that of the polymer matrix, light can pass through directly, and the liquid crystal molecules become transparent. The light guide layer 1122 can convert the point or line light source generated by the light-emitting module 111 on one side into a surface light source, scattering and guiding the light emitted by the light-emitting module 111 to be emitted uniformly, forming a bright surface light source, providing uniform backlight for the semi-transparent and semi-reflective liquid crystal cell 120. The reflective layer 1123 can reflect the light emitted by the light-emitting module 111 or the light incident from natural light into the light guide layer 1122.

[0041] Specifically, the dual-state liquid crystal layer 1121 includes a polymer-dispersed liquid crystal film. The reflective layer 1123 includes a metallic reflective film or a mirror coating. The light-emitting module 111 includes multiple LED beads or LED strings. The polymer-dispersed liquid crystal film is in a scattering state when there is no electric field; the refractive index of the liquid crystal droplets does not match that of the polymer matrix, causing light to be scattered upon incident, resulting in an opaque, milky-white appearance. Under an electric field, the polymer-dispersed liquid crystal film becomes transparent; the liquid crystal molecules align themselves under the influence of the electric field, and when the effective refractive index of the liquid crystal droplets approaches that of the polymer matrix, light can pass through directly, and the liquid crystal molecules become transparent.

[0042] Metallic reflective films typically consist of a single metal layer, usually made of metals such as aluminum, silver, or gold. Based on the principle of light reflection, when light shines on a metal surface, the amplitude of the light entering the metal decreases rapidly due to the metal's large extinction coefficient. This reduces the amount of light energy entering the metal while increasing the amount of reflected light, thus achieving high reflectivity. Mirror coatings, on the other hand, are smooth films formed by depositing highly reflective materials (such as metals, alloys, or oxides) on the surface of substrates like glass, metal, or plastic, giving the substrate a mirror-like high reflectivity.

[0043] An LED chip is a small light source element that can emit light independently. It is usually composed of a light-emitting chip, a package structure, electrodes, etc., and can produce visible light by being driven by an electric current. A light string is a long strip-shaped assembly that can emit light continuously, by fixing several small light sources (such as LEDs, incandescent bulbs, etc.) at a certain interval on wires or a flexible substrate. For example, a light string is made up of multiple LED chips connected in series or parallel.

[0044] Optionally, based on the above embodiments, the backlight module 110 further includes a control module; the light-emitting module 111 and the dual-state liquid crystal layer 1121 are both connected to the control module, and the control module can control the light-emitting module 111 to emit light and control the dual-state liquid crystal layer 1121 to adjust to a transparent state or a scattering state.

[0045] When there is sufficient ambient light, the control module turns off the light-emitting module 111 and applies an electric field to the dual-state liquid crystal layer 1121, making the dual-state liquid crystal layer 1121 transparent. When there is insufficient ambient light, the control module controls the light-emitting module 111 to emit light, and the control module does not apply an electric field to the dual-state liquid crystal layer 1121, making the dual-state liquid crystal layer 1121 diffuse.

[0046] Figure 6 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present utility model, as shown below. Figure 6 As shown, the display panel includes a backlight module and a transflective liquid crystal cell 120 provided in any embodiment of the present invention; the transflective liquid crystal cell 120 is disposed on the side of the light processing layer 112 away from the back plate 113.

[0047] Among them, the semi-transmissive and semi-reflective liquid crystal cell 120 is a display component that combines the advantages of transmissive liquid crystal cells and reflective liquid crystal cells. It can reflect part of the incident light, transmit part of the incident light, and transmit the light from the backlight.

[0048] Specifically, the transflective liquid crystal cell 120 includes a transflective layer 121; the transflective layer 121 can transmit part of the incident light and reflect part of the incident light.

[0049] Figure 7 A schematic diagram of the optical path of a display panel under strong light is provided for an embodiment of this utility model, as shown below. Figure 7 As shown, when the ambient light is sufficient, the control module controls the light-emitting module 111 to turn off, and the control module applies an electric field to the dual-state liquid crystal layer 1121, making the dual-state liquid crystal layer 1121 transparent. At this time, the light transmitted from the transflective liquid crystal cell can pass through the dual-state liquid crystal layer 1121 and the light guide layer 1122 to the reflective layer 1123. The reflective layer 1123 reflects the incident light to compensate for the insufficient reflectivity and uneven reflected light caused by the transmission of the transflective liquid crystal module 120, thereby improving the light output and uniformity of the transflective liquid crystal module 120.

[0050] Figure 8 A schematic diagram of the optical path of a display panel under low light conditions is provided for an embodiment of this utility model, as shown below. Figure 8As shown, when the ambient light is insufficient, the control module controls the light-emitting module 111 to emit light, and the control module does not apply an electric field to the dual-state liquid crystal layer 1121, causing the dual-state liquid crystal layer 1121 to be in a scattering state. The light guide layer 1122 can convert the point light source or line light source generated by the light-emitting module 111 on one side into a surface light source, reflecting, refracting and guiding the light emitted by the light-emitting module 111 to be emitted uniformly, forming a bright surface light source, providing uniform backlight for the transflective liquid crystal module 120. At the same time, the reflective layer 1123 reflects the light incident on it, causing the light from the light-emitting module 111 to be concentrated and emitted towards the transflective liquid crystal module 120. The dual-state liquid crystal layer 1121 in a scattering state scatters the light emitted from the light guide plate, making the light entering the transflective liquid crystal module 120 more uniform.

[0051] This utility model embodiment also provides a display device, which includes the backlight module provided in any embodiment of this utility model, and therefore has the beneficial effects of the backlight module provided in any embodiment of this utility model, which will not be described in detail here.

[0052] 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.

[0053] 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 backlight module applied to a transflective display panel, characterized in that, The backlight module includes a light-emitting module, a light processing layer, and a backplate; The light processing layer is disposed on the back plate, and the light-emitting module is disposed on one side of the light processing layer along the horizontal direction; The light-emitting module can provide light when there is insufficient ambient light, and the light processing layer can reflect or scatter the incoming light.

2. The backlight module according to claim 1, characterized in that, The light processing layer includes a dual-state liquid crystal layer, a light guide layer, and a reflective layer; The reflective layer is disposed on one side of the back panel, the light guide layer is disposed on the side of the reflective layer away from the back panel, and the dual-state liquid crystal layer is disposed on the side of the light guide layer away from the reflective layer.

3. The backlight module according to claim 2, characterized in that, The light-emitting module is disposed on one side of the light guide layer along the horizontal direction.

4. The backlight module according to claim 2, characterized in that, The backlight module also includes a control module; Both the light-emitting module and the dual-state liquid crystal layer are connected to the control module. The control module can control the light-emitting module to emit light and control the dual-state liquid crystal layer to adjust to a transparent state or a scattering state.

5. The backlight module according to claim 2, characterized in that, The reflective layer includes a metallic reflective film or a mirror coating.

6. The backlight module according to claim 1, characterized in that, The light-emitting module includes multiple LED beads or LED strings.

7. The backlight module according to claim 2, characterized in that, The dual-state liquid crystal layer comprises a polymer-dispersed liquid crystal film.

8. A display panel, characterized in that, Includes the backlight module and the semi-transmissive liquid crystal cell as described in any one of claims 1-7; The semi-transmissive and semi-reflective liquid crystal cell is disposed on the side of the light processing layer away from the back plate.

9. The display panel according to claim 8, characterized in that, The semi-transparent and semi-reflective liquid crystal cell includes a semi-transparent and semi-reflective layer; The semi-transparent and semi-reflective layer can transmit some of the incoming light and reflect some of the incoming light.

10. A display device, characterized in that, Includes the backlight module as described in any one of claims 1-7.

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