Cholesteric liquid crystal display apparatus having self-contained light source

Abstract

A cholesteric liquid crystal display apparatus (1) having a self-contained light source, comprising first lower glass (101), a first conductive layer (108), a first cholesteric liquid crystal unit (103), first upper glass (102), a first flexible printed circuit (106), a plurality of first LED light-emitting elements (109), and a first optical protective adhesive (105). A first space (104) is formed on the sides of the first upper glass (102). The first LED light-emitting elements (109) are arranged within the first space (104) and outside side edges of the first upper glass (102). The center of the light-emitting angle of each first LED light-emitting element (109) is perpendicular to the normal of the first upper glass (102). The first optical protective adhesive (105) is filled in between the first LED light-emitting elements (109) and the first upper glass (102), and a plurality of first light-transmitting particles (1051) are further mixed within the first optical protective adhesive (105), the refractive index of the first light-transmitting particles (1051) being different from that of the first optical protective adhesive (105). Furthermore, provided is a cholesteric liquid crystal display apparatus (2) having a self-contained light source, the cholesteric liquid crystal display apparatus (2) being formed from three layers of cholesteric liquid crystal display modules.

Description

Cholesteric liquid crystal display device with built-in light source TECHNICAL FIELD

[0001] The present invention relates to liquid crystal display technology, and in particular to a cholesteric liquid crystal display device. BACKGROUND

[0002] Cholesteric liquid crystal is one of the main technologies applied in electronic book displays. Due to its bistable display characteristics, it almost does not need electricity when the screen is static, thus having the effect of saving electricity. At the same time, cholesteric liquid crystal is a reflective display technology, which can be clearly observed in the presence of external ambient light, but cannot be observed in the absence of external ambient light. To solve this problem, a front light source is generally used to supplement light. Some directly irradiate a lamp to the display viewing surface outside the display viewing surface, and some configure an additional light guide plate to uniformly guide the light from the external lamp to the display viewing surface. However, the latter reduces the amount of light entering in normal environment, affecting the reflectivity.

[0003] In the prior art, Patent No. TW200511881A and CN1721924A disclose a display with increased contrast ratio using cholesteric liquid crystal polymer. A conductive layer, a hole transport layer, a light emitting layer, an electron transport layer, and a cathode electrode layer are sequentially stacked on a transparent substrate. An insulating encapsulation layer is provided on the cathode electrode layer for encapsulation. The hole transport layer is coated with a high molecular hole transport material and aligned on the conductive layer. The light emitting layer with cholesteric liquid crystal phase is made on the aligned hole transport layer. The light emitting layer is annealed to form a structure that can induce cholesteric liquid crystal light molecules to emit chiral circularly polarized light. A circularly polarized optical film is attached to one side of the substrate.

[0004] In the prior art, Patent No. TW202244574A discloses a cholesteric liquid crystal composite display device, which includes a light-absorbing substrate, a first transparent substrate, a second transparent substrate, an LED light supplementing module disposed between the light-absorbing substrate and the first transparent substrate, a control module, a first electrode layer formed on the first transparent substrate, a second electrode layer formed on the second transparent substrate, a first cholesteric liquid crystal layer interposed between the first electrode layer and the second electrode layer, and a first light-absorbing layer disposed on the second transparent substrate. The projection of the first light-absorbing layer on the horizontal plane is misaligned with the projection of the light supplementing module on the horizontal plane. The control module controls the light supplementing module according to a brightness signal. In this way, when the external brightness is low, the display brightness of the cholesteric liquid crystal composite display device can be enhanced through the light supplementing module.

[0005] In the prior art, patent number TW202407433A discloses a cholesteric liquid crystal composite display device, comprising: a cholesteric liquid crystal reflective display device; a penetrating display device with LEDs located below the cholesteric liquid crystal reflective display device; wherein when the cholesteric liquid crystal reflective display device is in normal display, the penetrating display device displays as dark; when the cholesteric liquid crystal reflective display device is in transparent state display, the penetrating display device is general display, and when the cholesteric liquid crystal reflective display device is in transparent state display, a rated driving mode is used to make the light transmittance of the cholesteric liquid crystal reflective display device higher than that when the cholesteric liquid crystal reflective display device is in normal dark state display.

[0006] The above prior art still has considerable difficulty in industrial implementation and needs to be optimized and improved. Therefore, the present application proposes a solution.

[0007] SUMMARY

[0008] The purpose of the present application is to provide a self-light-source cholesteric liquid crystal display device, which integrates LED light source and light guide technology into a cholesteric liquid crystal display device, and completes a self-light-source cholesteric liquid crystal display device that does not need external light source.

[0009] The first preferred embodiment of the present application is a single-color display self-light-source cholesteric liquid crystal display device, which has a first cholesteric liquid crystal display module, the first cholesteric liquid crystal display module includes a first lower glass, a first conductive layer, a first cholesteric liquid crystal unit, a first upper glass, and a first flexible circuit board and a plurality of first LED light emitting elements disposed on the first lower glass and electrically connected to the first conductive layer.

[0010] The horizontal projection of the first upper glass is larger than and covers the horizontal projection of the first cholesteric liquid crystal unit, and the horizontal projection of the first lower glass is larger than and covers the horizontal projection of the first upper glass. A first space is formed at the side of the first upper glass and above the intersection area of the first lower glass. The first LED light emitting elements are disposed in the first space, outside at least one side of the first upper glass, and electrically connected to the first conductive layer. The first optical protection glue is filled between the first LED light emitting elements and the first upper glass, and a plurality of first light-transmitting particles with different refractive index from the first optical protection glue are mixed in the first optical protection glue, thereby achieving light scattering effect. By the light guiding effect of the first optical protection glue and the light scattering of the first light-transmitting particles, the emitted light of the first LED light emitting elements can be uniformly guided to the upper side of the first cholesteric liquid crystal unit as its light source, so that the first cholesteric liquid crystal unit can produce light reflection and picture display effect. In this way, the self-light-source cholesteric liquid crystal display device can provide single-color display without external light source.

[0011] Preferably, the first optical protection glue can also extend to cover the first LED light emitting element, forming a better light guide effect. The first LED light emitting element is a packaged LED, or a micro-LED without packaging or a mini-LED with a base.

[0012] Based on the same technical idea, the present application further provides another preferred embodiment, which is a full-color display self-luminous cholesteric liquid crystal display device, comprising the first cholesteric liquid crystal display module, a second cholesteric liquid crystal display module arranged above the first cholesteric liquid crystal display module, and a third cholesteric liquid crystal display module arranged above the second cholesteric liquid crystal display module. The second cholesteric liquid crystal display module comprises a second lower glass, a second conductive layer, a second cholesteric liquid crystal unit, a second upper glass, and a second flexible circuit board arranged on the second lower glass and electrically connected to the second conductive layer, and the horizontal projection of the second upper glass is larger than and covers the horizontal projection of the second cholesteric liquid crystal unit. The third cholesteric liquid crystal display module comprises a third lower glass, a third conductive layer, a third cholesteric liquid crystal unit, a third upper glass, and a third flexible circuit board arranged on the third lower glass and electrically connected to the third conductive layer, and the horizontal projection of the third upper glass is larger than and covers the horizontal projection of the third cholesteric liquid crystal unit.

[0013] The horizontal projection of the second lower glass is larger than and covers the horizontal projection of the second upper glass, and a second space is formed at the side of the second upper glass and above the intersection area of the second lower glass. The self-luminous cholesteric liquid crystal display device further comprises a plurality of second LED light emitting elements arranged in the second space, outside at least one side of the second upper glass, and electrically connected to the second conductive layer. The self-luminous cholesteric liquid crystal display device further comprises a second optical protection glue filled between the second LED light emitting element and the second upper glass, and the second optical protection glue further mixed with a plurality of second light-transmitting particles, the refractive index of the second light-transmitting particles being different from that of the second optical protection glue, thereby achieving light scattering effect.

[0014] The horizontal projection of the third lower glass is larger than and covers the horizontal projection of the third upper glass, and a third space is formed at the side of the third upper glass and above the intersection area of the third lower glass. The self-luminous cholesteric liquid crystal display device further comprises a plurality of third LED light emitting elements arranged in the third space, outside at least one side of the third upper glass, and electrically connected to the third conductive layer. The self-luminous cholesteric liquid crystal display device further comprises a third optical protection glue filled between the third LED light emitting element and the third upper glass, and the third optical protection glue further mixed with a plurality of third light-transmitting particles, the refractive index of the third light-transmitting particles being different from that of the third optical protection glue, thereby achieving light scattering effect.

[0015] Preferably, the second optical protection glue can also extend to cover the second LED light emitting element, forming a better light guide effect; the second LED light emitting element is a packaged LED, or a micro-LED without packaging or a mini-LED with a base.

[0016] By the light guiding effect of the first optical protection glue and the light scattering of the first light-transmitting particles, the emitted light of the first LED light emitting element can be uniformly guided to the upper side of the first cholesteric liquid crystal unit as its light source, so that the first cholesteric liquid crystal unit produces light reflection and picture display. By the light guiding effect of the second optical protection glue and the light scattering of the second light-transmitting particles, the emitted light of the second LED light emitting element can be uniformly guided to the upper side of the second cholesteric liquid crystal unit as its light source, so that the second cholesteric liquid crystal unit produces light reflection and picture display. By the light guiding effect of the third optical protection glue and the light scattering of the third light-transmitting particles, the emitted light of the third LED light emitting element can be uniformly guided to the upper side of the third cholesteric liquid crystal unit as its light source, so that the third cholesteric liquid crystal unit produces light reflection and picture display. In this way, the cholesteric liquid crystal display device with a light source can provide full-color display without an external light source.

[0017] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the contents of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are listed, and the details are described below with the help of the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] The included drawings serve to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, which is used to illustrate the embodiments of the present application, and together with the text description, to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and are not used to limit the embodiments of the present application. For those skilled in the art, other drawings can be derived from these drawings without creative labor. The drawings include:

[0019] Fig. 1 is a perspective view of a cholesteric liquid crystal display device with a light source according to a first preferred embodiment of the present application;

[0020] Fig. 2 is a cross-sectional view of a cholesteric liquid crystal display device with a light source according to a first preferred embodiment of the present application;

[0021] Fig. 3 is a schematic diagram of a configuration of the first LED light emitting element in the first preferred embodiment of the present application;

[0022] Fig. 4 is a schematic diagram of another embodiment of the first optical protection glue in the first preferred embodiment of the present application;

[0023] Fig. 5 is a schematic diagram of the combination of the first LED light emitting element and the first conductive layer in the enlarged view of the portion A in Fig. 1;

[0024] Fig. 6 is a schematic diagram of a self-luminous cholesteric liquid crystal display device in the second preferred embodiment of the present application;

[0025] Fig. 7 is a schematic diagram of a cross section of a self-luminous cholesteric liquid crystal display device in the second preferred embodiment of the present application;

[0026] Fig. 8 is a schematic diagram of another embodiment of the first optical protection glue, the second optical protection glue and the third optical protection glue in the second preferred embodiment of the present application;

[0027] Fig. 9 is a schematic diagram of another configuration position of the reflector in the second preferred embodiment of the present application.

[0028] Fig. 6 is a schematic diagram of a self-luminous cholesteric liquid crystal display device in the second preferred embodiment of the present application; DETAILED DESCRIPTION

[0029] The specific structure and functional details disclosed herein are merely representative and are intended for purposes of describing exemplary embodiments of the present application. However, the present application can be embodied in many alternative forms and should not be construed as limited to the embodiments set forth herein.

[0030] In the description of the present application, it needs to be understood that the terms "center", "transverse", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or component referred to must have a particular orientation, or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, the term "comprising" and any variations thereof mean "at least including".

[0031] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the example embodiments. Unless the context clearly indicates otherwise, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0033] First preferred embodiment

[0034] The first preferred embodiment of the present application is a self-luminous cholesteric liquid crystal display device 1, please refer to FIG. 1 to FIG. 5. The self-luminous cholesteric liquid crystal display device 1 has a first cholesteric liquid crystal display module 10, which includes a first lower glass 101, a first conductive layer 108, a first cholesteric liquid crystal cell 103, a first upper glass 102, a first flexible circuit board 106, and a plurality of first LED light emitting elements 109 connected in sequence. The first flexible circuit board 106 is arranged on the first lower glass 101 and is electrically connected with the first conductive layer 108.

[0035] The horizontal projection of the first upper glass 102 is larger than and covers the horizontal projection of the first cholesteric liquid crystal cell 103, and the horizontal projection of the first lower glass 101 is larger than and covers the horizontal projection of the first upper glass 102, thus forming a first space 104 at the side of the first upper glass 102 and above the first lower glass 101, as shown in Fig. 2. The first LED light emitting element 109, as the self-provided light source of the first cholesteric liquid crystal display module 10, is arranged in the first space 104 and electrically connected to the first conductive layer 108. Since the first upper glass 102 has four sides, the first LED light emitting element 109 is arranged outside at least one side of the first upper glass 102 to emit light into the first upper glass 102. For a larger size of the first cholesteric liquid crystal display module 10, the first LED light emitting element 109 can also be arranged at two adjacent sides, two opposite sides, or even at all four sides of the first upper glass 102, as shown in Fig. 3.

[0036] If viewed in a cross-sectional view, the light emitted by the first LED light emitting element 109 is not in a single direction, but in a fan shape. Referring to Fig. 2, in one embodiment of the present embodiment, to achieve the preferred effect that the light emitted by the first LED light emitting element 109 enters the first upper glass 102, the center of the light emitting angle of the first LED light emitting element 109 is perpendicular to the normal line of the first upper glass 102, and most of the light emitted by the first LED light emitting element 109 can directly enter the first upper glass 102. That is, the top surface of the LED die in the first LED light emitting element 109 is directed to the side of the first upper glass 102, and the first LED light emitting element 109 is connected to the first conductive layer 108 on the upper surface of the first lower glass 101.

[0037] Basically, LED is a point light source, and the uniformity of light is poor. In order to achieve better light guiding and light uniformity, the self-provided light source cholesteric liquid crystal display device 1 further comprises a first optical protection glue 105 filled between the first LED light emitting element 109 and the first upper glass 102, as shown in Figs. 2 and 5. The first optical protection glue 105 further contains a plurality of first light-transmitting particles 1051 having a refractive index different from that of the first optical protection glue 105. When light encounters the first light-transmitting particles 1051, interface refraction and interface reflection occur at the interface between the first optical protection glue 105 and the first light-transmitting particles 1051, and the directions of the refracted light and the reflected light are different from that of the incident light. Therefore, when the size of the first light-transmitting particles 1051 is small and the number reaches a certain degree, the effect of light uniformity can be achieved. That is, the light emitted by the first LED light emitting element 109 can be more uniformly emitted into the first upper glass 102 after the light guiding and light uniformity of the first optical protection glue 105 and the first light-transmitting particles 1051, serving as the light source of the first cholesteric liquid crystal cell 103.

[0038] In order to achieve better light guiding effect, the first optical protection glue 105 extends to cover the first LED light emitting element 109 for the first LED light emitting element 109 with thin thickness, as shown in FIG. 4, so that the light emitted upward by the first LED light emitting element 109 can also be guided into the first upper glass 102.

[0039] In order to reduce the thickness of the overall self-light-source cholesteric liquid crystal display device 1, the first lower glass 101 and the first upper glass 102 are preferably thin glass sheets with a thickness of 0.1-0.7 mm, and the first LED light emitting element 109 is an encapsulated LED, or a micro-LED without encapsulation or a mini-LED with a base. Since the micro-LED and the mini-LED have small size, they can be arranged more densely after forming an LED array, and as light sources, they can reduce the difference between bright and dark, and the overall light uniformity is better.

[0040] The first LED light emitting element 109 is electrically connected to the first conductive layer 108, and preferably can be electrically connected by anisotropic conductive adhesive, lead-free solder or other metal welding. In addition, other electrical connection methods can also be used, as shown in FIG. 5, the self-light-source cholesteric liquid crystal display device 1 further includes a plurality of first conductive pieces 1082, and the first conductive layer 108 further forms a plurality of first through holes 1081. The first LED light emitting element 109 is electrically fixed to the first conductive piece 1082, and the first conductive piece 1082 is fixed to the first lower glass 101 through the first through hole 1081 and electrically connected to the first conductive layer 108.

[0041] Based on the same technical idea, the present application further proposes a second preferred embodiment, which is a self-light-source cholesteric liquid crystal display device 2, please refer to FIG. 6 to FIG. 9.

[0042] The self-light-source cholesteric liquid crystal display device 2 includes a first cholesteric liquid crystal display module 10, a second cholesteric liquid crystal display module 20, and a third cholesteric liquid crystal display module 30. The second cholesteric liquid crystal display module 20 is sequentially arranged above the first cholesteric liquid crystal display module 10, and the third cholesteric liquid crystal display module 30 is sequentially arranged above the second cholesteric liquid crystal display module 20. The composition and characteristics of the first cholesteric liquid crystal display module 10 are the same as those of the first preferred embodiment described above. The structures of the second cholesteric liquid crystal display module 20 and the third cholesteric liquid crystal display module 30 are similar to those of the first cholesteric liquid crystal display module 10.

[0043] The second cholesteric liquid crystal display module 20 comprises a second lower glass 201, a second conductive layer 208, a second cholesteric liquid crystal cell 203, a second upper glass 202, and a second flexible circuit board 206 disposed on the second lower glass 201 and electrically connected to the second conductive layer 208. The horizontal projection of the second upper glass 202 is larger than and covers the horizontal projection of the second cholesteric liquid crystal cell 203, and the horizontal projection of the second lower glass 201 is larger than and covers the horizontal projection of the second upper glass 202. The second space 204 is formed at the side of the second upper glass 202 and above the second lower glass 201.

[0044] The self-luminous cholesteric liquid crystal display device 2 further comprises a plurality of second LED light emitting elements 209 as the self-luminous light source of the second cholesteric liquid crystal display module 20, which are disposed in the second space 204 and electrically connected to the second conductive layer 208.

[0045] Since the second upper glass 202 has four side edges, the second LED light emitting elements 209 are disposed outside at least one side edge of the second upper glass 202 to emit light into the second upper glass 202. For a larger size of the second cholesteric liquid crystal display module 20, the second LED light emitting elements 209 can also be disposed at two adjacent side edges, two opposite side edges, or even all four side edges of the second upper glass 202.

[0046] If viewed in a cross-sectional view, the light emitted by the second LED light emitting elements 209 is not in a single direction, but in a fan shape. As shown in FIG. 7, in one embodiment of the present embodiment, to achieve the preferable effect that the light emitted by the second LED light emitting elements 209 enters the second upper glass 202, the center of the light emitting angle of the second LED light emitting elements 209 is perpendicular to the normal line of the second upper glass 202, and most of the light emitted by the second LED light emitting elements 209 can directly enter the second upper glass 202. That is, the top surface of the LED chip in the second LED light emitting elements 209 is directed to the side surface of the second upper glass 202, and the second LED light emitting elements 209 are connected to the second conductive layer 208 on the second lower glass 201.

[0047] In order to achieve better light guiding and light homogenizing effects, the self-luminous cholesteric liquid crystal display device 2 further comprises a second optical protection glue 205 filled between the second LED light emitting element 209 and the second upper glass 202, and a plurality of second light-transmitting particles 2051 are mixed in the second optical protection glue 205, and the refractive index of the second light-transmitting particles 2051 is different from that of the second optical protection glue 205. When the light encounters the second light-transmitting particles 2051, interface refraction and interface reflection will occur at the interface between the second optical protection glue 205 and the second light-transmitting particles 2051, and the directions of the refracted light and the reflected light are different from that of the incident light. Therefore, when the size of the second light-transmitting particles 2051 is small and the number reaches a certain degree, the light homogenizing effect can be achieved. That is, the light emitted by the second LED light emitting element 209 can be more uniformly injected into the second upper glass 202 as the light source of the second cholesteric liquid crystal unit 203 after the light guiding and light homogenizing effects of the second optical protection glue 205 and the second light-transmitting particles 2051.

[0048] In order to achieve better light guiding effects, the second optical protection glue 205 extends to cover the second LED light emitting element 209 for the second LED light emitting element 209 with a relatively thin thickness, as shown in FIG. 8, so that the light emitted upward by the second LED light emitting element 209 can also be guided into the second upper glass 202.

[0049] In order to reduce the thickness of the self-luminous cholesteric liquid crystal display device 1, the second lower glass 201 and the second upper glass 202 are preferably thin glass sheets with a thickness of 0.1-0.7 mm, and the second LED light emitting element 209 is an encapsulated LED, or a micro-LED without encapsulation or a mini-LED with a base. Since the micro-LED and the mini-LED have small sizes, they can be arranged more densely after forming an LED array, and as light sources, they can reduce the difference between bright and dark areas and improve the overall light uniformity.

[0050] The second LED light emitting element 209 is electrically connected to the second conductive layer 208, and preferably, the electrical connection can be achieved by anisotropic conductive adhesive, lead-free solder or other metal welding. In addition, other electrical connection methods can also be used, for example, the self-luminous cholesteric liquid crystal display device 2 further comprises a plurality of second conductive pieces, and the second conductive layer 208 further forms a plurality of second through holes, the second LED light emitting element 209 is electrically fixed to the second conductive piece, and the second conductive piece is fixed to the second lower glass 201 through the second through hole and is electrically connected to the second conductive layer 208.

[0051] The third cholesteric liquid crystal display module 30 comprises a third lower glass 301, a third conductive layer 308, a third cholesteric liquid crystal cell 303, a third upper glass 302, and a third flexible circuit board 306 disposed on the third lower glass 301 and electrically connected to the third conductive layer 308. The horizontal projection of the third upper glass 302 is larger than and covers the horizontal projection of the third cholesteric liquid crystal cell 303, and the horizontal projection of the third lower glass 301 is larger than and covers the horizontal projection of the third upper glass 302. A third space 304 is formed at the side of the third upper glass 302 and above the third lower glass 301.

[0052] The self-luminous cholesteric liquid crystal display device 2 further comprises a plurality of third LED light emitting elements 309 as the self-luminous light source of the third cholesteric liquid crystal display module 30, which are disposed in the third space 304 and electrically connected to the third conductive layer 308.

[0053] Since the third upper glass 302 has four side edges, the third LED light emitting elements 309 are disposed outside at least one side edge of the third upper glass 302 to emit light into the third upper glass 302. For a larger size of the third cholesteric liquid crystal display module 30, the third LED light emitting elements 309 can be disposed at two adjacent side edges, two opposite side edges, or even all four side edges of the third upper glass 302.

[0054] If viewed in a cross-sectional view, the light emitted by the third LED light emitting elements 309 is not in a single direction, but in a fan shape. As shown in FIG. 7, in one embodiment of the present embodiment, to achieve the preferable effect that the light emitted by the third LED light emitting elements 309 enters the third upper glass 302, the center of the light emitting angle of the third LED light emitting elements 309 is perpendicular to the normal line of the third upper glass 302, and most of the light emitted by the third LED light emitting elements 309 can directly enter the third upper glass 302. That is, the top surface of the LED chip in the third LED light emitting elements 309 is directed to the side surface of the third upper glass 302, and the third LED light emitting elements 309 are connected to the third conductive layer 308 on the upper surface of the third lower glass 301.

[0055] In order to achieve better light guiding and light homogenizing effects, the self-luminous cholesteric liquid crystal display device 2 further comprises a third optical protection glue 305 filled between the third LED light emitting element 309 and the third upper glass 302, and a plurality of third light-transmitting particles 3051 are mixed in the third optical protection glue 305, and the refractive index of the third light-transmitting particles 3051 is different from that of the third optical protection glue 305. When the light encounters the third light-transmitting particles 3051, interface refraction and interface reflection will occur at the interface between the third optical protection glue 305 and the third light-transmitting particles 3051, and the directions of the refracted light and the reflected light are different from that of the incident light. Therefore, when the size of the third light-transmitting particles 3051 is small and the number reaches a certain degree, the light homogenizing effect can be achieved. That is, the light emitted by the third LED light emitting element 309 can be more uniformly incident into the third upper glass 302 as the light source of the third cholesteric liquid crystal unit 303 after the light guiding and light homogenizing effects of the third optical protection glue 305 and the third light-transmitting particles 3051.

[0056] In order to achieve better light guiding effects, the third optical protection glue 305 further extends to cover the third LED light emitting element 309 for the third LED light emitting element 309 with a relatively thin thickness, as shown in FIG. 8, so that the light emitted upward by the third LED light emitting element 309 can also be guided into the third upper glass 302.

[0057] In order to reduce the thickness of the self-luminous cholesteric liquid crystal display device 1, the third lower glass 301 and the third upper glass 302 are preferably thin glass sheets with a thickness of 0.1-0.7 mm, and the third LED light emitting element 309 is an encapsulated LED, or a micro-LED without encapsulation or a mini-LED with a base. Since the micro-LED and the mini-LED have a small size, they can be arranged more densely after forming an LED array, and as a light source, they can reduce the difference between bright and dark areas and improve the overall light uniformity.

[0058] The third LED light emitting element 309 is electrically connected to the third conductive layer 308, and preferably, the electrical connection can be achieved by anisotropic conductive adhesive, lead-free solder or other metal welding. In addition, other electrical connection methods can also be used, for example, the self-luminous cholesteric liquid crystal display device 2 further comprises a plurality of third conductive sheets, the third conductive layer 308 further forms a plurality of third through holes, the third LED light emitting element 309 is fixedly connected to the third conductive sheet, and the third conductive sheet is fixed to the third lower glass 301 through the third through hole and is electrically connected to the third conductive layer 308.

[0059] In the embodiment, the self-luminous cholesteric liquid crystal display device 2 has three cholesteric liquid crystal display modules, i.e., a first cholesteric liquid crystal display module 10, a second cholesteric liquid crystal display module 20, and a third cholesteric liquid crystal display module 30. Therefore, the self-luminous cholesteric liquid crystal display device 2 can display full-color images. At this time, the first cholesteric liquid crystal display module 10 displays a red image, the second cholesteric liquid crystal display module 20 displays a green image, and the third cholesteric liquid crystal display module 30 displays a blue image. The light emitted by the corresponding first LED light emitting element 109, second LED light emitting element 209, and third LED light emitting element 309 is red light, green light, and blue light, respectively.

[0060] On the other hand, since the first LED light emitting element 109 and the second LED light emitting element 209 both emit light upward, the light will pass through the second lower glass 201 and the third lower glass 301, respectively, and affect vision. Therefore, in a preferred embodiment, the embodiment further provides a first light reflecting sheet 110 and a second light reflecting sheet 210, as shown in FIG. 8 and FIG. 9. The first light reflecting sheet 110 is arranged on the second lower glass 201 and relative to the positions of the plurality of first LED light emitting elements 109, and is used to reflect the light emitted by the first LED light emitting element 109 and passing through the first optical protection glue 105 back into the first optical protection glue 105 for light guiding. The second light reflecting sheet 210 is arranged on the third lower glass 301 and relative to the positions of the plurality of second LED light emitting elements 209, and is used to reflect the light emitted by the second LED light emitting element 209 and passing through the second optical protection glue 205 back into the second optical protection glue 205 for light guiding. Considering the process technology, if etching technology is used, the first light reflecting sheet 110 can be arranged on the upper side of the second lower glass 201, and the second light reflecting sheet 210 can be arranged on the upper side of the third lower glass 301, as shown in FIG. 8. If screen printing technology is used, the first light reflecting sheet 110 can be arranged on the lower side of the second lower glass 201, and the second light reflecting sheet 210 can be arranged on the lower side of the third lower glass 301, as shown in FIG. 9.

[0061] Since the first optical protection glue 105 is mixed with the first light-transmitting particles 1051 for light homogenization, the light range width of the light emitted by the first LED light emitting element 109 and passing through the first optical protection glue 105 to the first light reflecting sheet 110 is wider than the light range width of the light emitted by the first LED light emitting element 109. Therefore, the width of the first light reflecting sheet 110 should be greater than the width of the first LED light emitting element 109, and preferably 1.5 times or more the width of the first LED light emitting element 109. Similarly, the width of the second light reflecting sheet 210 should be greater than the width of the second LED light emitting element 209, and preferably 1.5 times or more the width of the second LED light emitting element 209.

[0062] In summary, the features of the present application are:

[0063] I. The space formed on the upper glass and the side of the upper glass of the cholesteric liquid crystal display module is provided with LED light emitting elements;

[0064] II. The space between the side of the upper glass and the LED light emitting elements is filled with optical protective glue mixed with light transmitting particles as a light guide plate.

[0065] The light emitted by the LED light emitting elements is more evenly injected into the upper glass after the light guiding and light homogenizing of the optical protective glue and the light transmitting particles, and serves as the embedded light source of the cholesteric liquid crystal display module. Thus, the cholesteric liquid crystal display device with light source of the present application can provide monochrome or full-color display effect without external light source.

[0066] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application is disclosed as above with the preferred embodiment, it is not intended to limit the scope of the present application. Any person skilled in the art can make equivalent changes and modifications to the above disclosed methods and technical contents without departing from the scope of the present application. Any equivalent changes and modifications to the above embodiments based on the technical essence of the present application without departing from the scope of the present application are still within the scope of the present application.

Claims

1. A cholesteric liquid crystal display device, comprising a first cholesteric liquid crystal display module (10), the first cholesteric liquid crystal display module (10) comprising a first lower glass (101), a first conductive layer (108), a first cholesteric liquid crystal cell (103), a first upper glass (102) connected in sequence, and a first flexible circuit board (106) disposed on the first lower glass (101) and electrically connected with the first conductive layer (108), the horizontal projection of the first upper glass (102) being larger than and covering the horizontal projection of the first cholesteric liquid crystal cell (103); characterized in that: the horizontal projection of the first lower glass (101) is larger than and covers the horizontal projection of the first upper glass (102), and a first space (104) is formed at the side of the first upper glass (102) and above the intersection area of the first lower glass (101); the self-luminous cholesteric liquid crystal display device further comprises a plurality of first LED light emitting elements (109) disposed in the first space (104) and located outside at least one side edge of the first upper glass (102) and electrically connected with the first conductive layer (108); the self-luminous cholesteric liquid crystal display device further comprises a first optical protection glue (105) filled between the first LED light emitting elements (109) and the first upper glass (102), and a plurality of first light-transmitting microparticles (1051) with different refractive indexes from the first optical protection glue (105) are mixed in the first optical protection glue (105).

2. The self-lit light source cholesteric liquid crystal display device according to claim 1, characterized in that: The center of the light emitting angle of the first LED light emitting element (109) is perpendicular to the normal line of the first upper glass (102).

3. The self-lit backlight cholesteric liquid crystal display device according to claim 1, wherein: The first optical protection glue (105) extends to cover the first LED light emitting element (109).

4. The self-lit backlight cholesteric liquid crystal display device according to claim 1, wherein: The first lower glass (101) and the first upper glass (102) are thin glass sheets with a thickness of 0.1-0.7 mm, and the first LED light emitting element (109) is selected from the group consisting of packaged LEDs, unpackaged micro-LEDs, and mini-LEDs with bases.

5. The self-lit backlight cholesteric liquid crystal display device according to claim 1, wherein: The first LED light emitting element (109) is electrically connected with the first conductive layer (108) by anisotropic conductive adhesive, lead-free solder, or other metal welding.

6. The self-lit backlight cholesterol liquid crystal display device according to claim 1, wherein: The self-luminous cholesteric liquid crystal display device further comprises a plurality of first conductive sheets (1082), the first conductive layer (108) further comprises a plurality of first through holes (1081), the first LED light emitting element (109) is fixedly connected with the first conductive sheet (1082), the first conductive sheet (1082) is fixed to the first lower glass (101) through the first through hole (1081) and electrically connected with the first conductive layer (108).

7. The self-lit backlight cholesterol liquid crystal display device according to claim 1, wherein: The first LED light emitting element (109) is disposed outside each of the four side edges of the first upper glass (102).

8. The self-lit cholesteric liquid crystal display device according to any one of claims 1 to 7, further comprising a second cholesteric liquid crystal display module (20) disposed above the first cholesteric liquid crystal display module (10) in sequence, and a third cholesteric liquid crystal display module (30) disposed above the second cholesteric liquid crystal display module (20) in sequence; the second cholesteric liquid crystal display module (20) comprises a second lower glass (201), a second conductive layer (208), a second cholesteric liquid crystal cell (203), a second upper glass (202), and a second flexible circuit board (206) disposed on the second lower glass (201) and electrically connected to the second conductive layer (208), the horizontal projection of the second upper glass (202) is larger than and covers the horizontal projection of the second cholesteric liquid crystal cell (203); the third cholesteric liquid crystal display module (30) comprises a third lower glass (301), a third conductive layer (308), a third cholesteric liquid crystal cell (303), a third upper glass (302), and a third flexible circuit board (306) disposed on the third lower glass (301) and electrically connected to the third conductive layer (308), the horizontal projection of the third upper glass (302) is larger than and covers the horizontal projection of the third cholesteric liquid crystal cell (303); characterized in that: the horizontal projection of the second lower glass (201) is larger than and covers the horizontal projection of the second upper glass (202), a second space (204) is formed at the side of the second upper glass (202) and above the intersection area of the second lower glass (201); the self-lit cholesteric liquid crystal display device further comprises a plurality of second LED light emitting elements (209) disposed in the second space (204) and located outside at least one side of the second upper glass (202), and electrically connected to the second conductive layer (208); the self-lit cholesteric liquid crystal display device further comprises a second optical protection glue (205) filled between the second LED light emitting elements (209) and the second upper glass (202), the second optical protection glue (205) further mixed with a plurality of second light-transmitting microparticles (2051), the refractive index of the second light-transmitting microparticles (2051) is different from that of the second optical protection glue (205); the horizontal projection of the third lower glass (301) is larger than and covers the horizontal projection of the third upper glass (302), a third space (304) is formed at the side of the third upper glass (302) and above the intersection area of the third lower glass (301); the self-lit cholesteric liquid crystal display device further comprises a plurality of third LED light emitting elements (309) disposed in the third space (304) and located outside at least one side of the third upper glass (302), and electrically connected to the third conductive layer (308). The self-light-source cholesteric liquid crystal display device further comprises a third optical protection glue (305) filled between the third LED light emitting element (309) and the third upper glass (302), and the third optical protection glue (305) further mixed with a plurality of third light transmission particles (3051), and the refractive index of the third light transmission particles (3051) is different from that of the third optical protection glue (305).

9. The self-lit backlight cholesterol liquid crystal display device according to claim 8, wherein: The center of the light emitting angle of the second LED light emitting element (209) is perpendicular to the normal line of the second upper glass (202); and the center of the light emitting angle of the third LED light emitting element (309) is perpendicular to the normal line of the third upper glass (302).

10. The self-lit backlight cholesterol liquid crystal display device according to claim 8, wherein: The first optical protection glue (105) extends to cover the first LED light emitting element (109); the second optical protection glue (205) extends to cover the second LED light emitting element (209); and the third optical protection glue (305) extends to cover the third LED light emitting element (309).

11. The self-lit light source cholesteric liquid crystal display device according to claim 8, characterized by: The second lower glass (201) and the second upper glass (202) are thin glass sheets with a thickness of 0.1-0.7 mm, the second LED light emitting element (209) is selected from the group consisting of packaged LED, unpackaged micro-LED and mini-LED with a base; the third lower glass (301) and the third upper glass (302) are thin glass sheets with a thickness of 0.1-0.7 mm, and the third LED light emitting element (309) is selected from the group consisting of packaged LED, unpackaged micro-LED and mini-LED with a base.

12. The self-lit backlight cholesterol liquid crystal display device according to claim 8, wherein: The second LED light emitting element (209) is electrically connected to the second conductive layer (208) by anisotropic conductive adhesive, lead-free solder or other metal welding; and the third LED light emitting element (309) is electrically connected to the third conductive layer (308) by anisotropic conductive adhesive, lead-free solder or other metal welding.

13. The self-lit cholesteric liquid crystal display device according to claim 8, wherein: The self-light-source cholesteric liquid crystal display device further comprises a plurality of second conductive sheets (2082) and a plurality of third conductive sheets (3082). The second conductive layer (208) is further provided with a plurality of second through holes (2081), the second LED light emitting element (209) is electrically fixed to the second conductive sheet (2082), the second conductive sheet (2082) is fixed to the second lower glass (201) through the second through hole (2081) and electrically connected to the second conductive layer (208); The third conductive layer (308) is further provided with a plurality of third through holes (3081), the third LED light emitting element (309) is electrically fixed to the third conductive sheet (3082), the third conductive sheet (3082) is fixed to the third lower glass (301) through the third through hole (3081) and electrically connected to the third conductive layer (308).

14. The self-lit backlight cholesterol liquid crystal display device according to claim 8, wherein: The second LED light emitting element (209) is arranged outside four side edges of the second upper glass (202); the third LED light emitting element (309) is arranged outside four side edges of the third upper glass (302).

15. The self-lit cholesteric liquid crystal display device according to claim 8, wherein: The emitted light of the first LED light emitting element (109), the second LED light emitting element (209) and the third LED light emitting element (309) is red light, green light and blue light respectively.

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