Quantum dot cholesterol liquid crystal display device

Abstract

The utility model provides a quantum dot cholesterol liquid crystal display device. A cholesterol liquid crystal display module comprises lower glass, a conducting layer, a cholesterol liquid crystal unit, upper glass, a flexible circuit board, a plurality of blue light LED elements and a quantum dot light guide structure. A containing space is formed in the side of the upper glass, and the blue light LED element is arranged in the containing space. The quantum dot light guide structure is arranged between the blue light LED element and the upper glass and can excite other colored light after absorbing blue light, and then the other colored light is emitted into the upper glass through light diffusion and dodging to serve as an external light source of the cholesterol liquid crystal unit. The utility model further provides a quantum dot cholesterol liquid crystal display device formed by the three layers of cholesterol liquid crystal display modules.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid crystal display, in particular to a cholesterol liquid crystal display device and a light source technology thereof. Background Art

[0002] Cholesteric liquid crystal is one of the main technologies used in e-book displays. It has the characteristics of bistable display, that is, when the picture is still, it almost does not require electricity, so it has the effect of saving electricity. At the same time, cholesteric liquid crystal is a reflective display technology, which can be clearly viewed in the presence of external ambient light, but cannot be viewed in the absence of external ambient light. To solve this problem, front light source is generally used for fill light. Some add a lamp outside the display viewing surface to directly illuminate the display viewing surface, and some will be equipped with a layer of light guide plate to evenly guide the light of the external lamp before irradiating it to the display viewing surface, but the latter will reduce the amount of light input under normal conditions and affect the reflectivity.

[0003] In the prior art, Patent Nos. TW200511881A and CN1721924A disclose a display that uses cholesterol liquid crystal polymers to increase contrast, wherein 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, and an insulating packaging layer for packaging is provided on the cathode electrode layer, and the hole transport layer is coated with a polymer hole transport material and aligned on the conductive layer, and a light-emitting layer having a cholesterol liquid crystal phase is made on the aligned hole transport layer, and the light-emitting layer is annealed and arranged into a structure that allows the cholesterol liquid crystal light-emitting molecules to induce chiral circularly polarized light, and a circularly polarized optical film is attached to one side of the substrate.

[0004] In the prior art, Patent No. TW202244574A discloses a cholesterol liquid crystal composite display device, including a light absorbing substrate, a first transparent substrate, a second transparent substrate, an LED fill light 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 cholesterol liquid crystal layer sandwiched 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 and the projection of the fill light module on the horizontal plane are offset. The control module controls the fill light module according to the brightness signal. Thereby, when the external brightness is low, the display brightness of the cholesterol liquid crystal composite display device can be enhanced through the fill light module.

[0005] In the prior art, Patent No. TW202407433A discloses a cholesterol liquid crystal composite display device, comprising: a cholesterol liquid crystal reflective display device; a transmissive display device with an LED, located below the cholesterol liquid crystal reflective display device; wherein, when the cholesterol liquid crystal reflective display device is in normal display, the transmissive display device displays in a dark color; when the cholesterol liquid crystal reflective display device is in a transparent state display, the transmissive display device is a general display, and when the cholesterol liquid crystal reflective display device is in a transparent state display, a rated driving mode is used to make the transmittance of the cholesterol liquid crystal reflective display device higher than the transmittance of the cholesterol liquid crystal reflective display device when it is in a normal dark state display.

[0006] The above-mentioned existing technologies still have deficiencies in the implementation of the industry and need to be optimized and improved. Utility Model Content

[0007] The purpose of the utility model is to provide a quantum dot cholesterol liquid crystal display device, which integrates LED light source, quantum dot technology and light guide technology into a cholesterol liquid crystal display to complete a quantum dot cholesterol liquid crystal display device that can be operated and used without external light source irradiation.

[0008] The first preferred embodiment proposed by the utility model is a quantum dot cholesterol liquid crystal display device with monochrome display, which has a cholesterol liquid crystal display module. The cholesterol liquid crystal display module includes a lower glass, a conductive layer, a cholesterol liquid crystal unit, an upper glass connected in sequence, and a flexible circuit board and a plurality of blue light LED elements arranged on the lower glass and electrically connected to the conductive layer.

[0009] The horizontal projection of the upper glass is larger than and covers the horizontal projection of the cholesterol liquid crystal unit, and the horizontal projection of the lower glass is larger than and covers the horizontal projection of the upper glass. An accommodating space is formed on the side of the upper glass and in the intersection area above the lower glass. The blue light LED element is arranged in the accommodating space, outside at least one side of the upper glass, and is electrically connected to the conductive layer. The quantum dot light-guiding structure is arranged between the blue light LED element and the upper glass, which can play a light scattering effect to make the light distribution more uniform. After absorbing the blue light emitted by the blue light LED, the quantum dot light-guiding structure can excite other colored lights different from the wavelength range of the blue light. Through the light-guiding effect of the quantum dot light-guiding structure and the light scattering of the scattered light particles, the aforementioned other colored lights can be uniformly guided into the upper glass as the light source of the cholesterol liquid crystal unit, so that the cholesterol liquid crystal unit produces light reflection and picture display. In this way, the quantum dot cholesterol liquid crystal display device can provide monochrome display without an external light source.

[0010] Preferably, the quantum dot light-guiding structure can also extend to cover the blue LED element to form a better light-guiding effect. The blue LED element is a packaged LED, or an unpackaged micro-LED or a mini-LED with a base can also be used.

[0011] The quantum dot light-guiding structure absorbs blue light and then excites other colored light different from blue light, such as red light or green light. Through the light-guiding effect of the quantum dot light-guiding structure and the light scattering of the scattering particles, the red light or green light excited by the quantum dots can be uniformly guided to the top of the cholesterol liquid crystal unit as its light source, so that the cholesterol liquid crystal unit produces red light or green light reflection and image display.

[0012] Based on the same technical idea, the utility model then proposes another preferred embodiment, which is a full-color quantum dot cholesteric liquid crystal display device, including a first cholesteric liquid crystal display module, a second cholesteric liquid crystal display module, and a third cholesteric liquid crystal display module stacked from bottom to top. 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 arranged on the first lower glass and electrically connected to the first conductive layer, wherein the horizontal projection of the first upper glass is larger than and covers the horizontal projection of the first cholesteric liquid crystal unit. The second cholesteric liquid crystal display module includes 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, wherein 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 includes 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, wherein 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 first lower glass is larger than and covers the horizontal projection of the first upper glass, and a first accommodation space is formed at the side of the first upper glass and at the intersection area above the first lower glass. The horizontal projection of the second lower glass is larger than and covers the horizontal projection of the second upper glass, and a second accommodation space is formed at the side of the second upper glass and at the intersection area above the second lower glass. The horizontal projection of the third lower glass is larger than and covers the horizontal projection of the third upper glass, and a third accommodation space is formed at the side of the third upper glass and at the intersection area above the third lower glass.

[0014] The quantum dot cholesterol liquid crystal display device also includes a plurality of first blue light LED elements, a plurality of second blue light LED elements, and a plurality of third blue light LED elements. The first blue light LED element is arranged in the first accommodation space, outside at least one side of the first upper glass, and electrically connected to the first conductive layer. The second blue light LED element is arranged in the second accommodation space, outside at least one side of the second upper glass, and electrically connected to the second conductive layer. The third blue light LED element is arranged in the third accommodation space, outside at least one side of the third upper glass, and electrically connected to the third conductive layer.

[0015] The quantum dot cholesterol liquid crystal display device also includes a first quantum dot light-guiding structure, a second quantum dot light-guiding structure, and a light-guiding and light-homogenizing structure. The first quantum dot light-guiding structure is disposed between the first blue light LED element and the first upper glass. The first quantum dot light-guiding structure absorbs blue light and excites a first color light different from the blue light. After the first quantum dot light-guiding structure guides and homogenizes the light, the first color light is emitted into the first upper glass.

[0016] The second quantum dot light guide structure is disposed between the second blue light LED element and the second upper glass. The second quantum dot light guide structure absorbs the blue light and excites a second color light different from the blue light. After being guided and homogenized by the second quantum dot light guide structure, the second color light is emitted into the second upper glass. At the same time, the wavelength range of the second color light is different from the wavelength range of the first color light.

[0017] The light-guiding and homogenizing structure is disposed between the third blue light LED element and the third upper glass. Different from the first quantum dot light-guiding structure and the second quantum dot light-guiding structure, the light-guiding and homogenizing structure has no quantum dots mixed inside, and will not stimulate other colors of light different from the blue light after absorbing the blue light. The blue light emitted by the third blue light LED is guided and homogenized by the light-guiding and homogenizing structure before being emitted into the third upper glass.

[0018] Preferably, the first quantum dot light-guiding structure can also extend to cover the first blue LED element, the second quantum dot light-guiding structure can also extend to cover the second blue LED element, and the light-guiding homogenizing structure can also extend to cover the third blue LED element, thereby forming a better light-guiding effect. The first blue LED element, the second blue LED element, and the third blue LED element are packaged LEDs, and unpackaged micro-LEDs or mini-LEDs with a base can also be used.

[0019] The first quantum dot light-guiding structure absorbs blue light and excites a first color light different from the blue light, for example, red light. The first quantum dot light-guiding structure uses a light-guiding effect and light scattering to uniformly guide the excited red light to the top of the first cholesterol liquid crystal unit as its light source, so that the first cholesterol liquid crystal unit produces red light reflection and image display. The second quantum dot light-guiding structure absorbs blue light and excites a second color light different from the blue light, for example, green light. The second quantum dot light-guiding structure uses a light-guiding effect and light scattering to uniformly guide the excited green light to the top of the second cholesterol liquid crystal unit as its light source, so that the second cholesterol liquid crystal unit produces green light reflection and image display. The light-guiding effect and light scattering of the light-guiding homogenizing structure can uniformly guide the blue light emitted by the third blue light LED element to the top of the third cholesterol liquid crystal unit as its light source, so that the third cholesterol liquid crystal unit produces blue light reflection and image display. In this way, the quantum dot cholesterol liquid crystal display device proposed by the utility model can provide full-color display without an external light source.

[0020] The advantages and spirit of the present invention can be further understood through the following detailed description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The provided drawings are used to provide a further understanding of the embodiments of the utility model, which constitute a part of the specification, are used to illustrate the implementation of the utility model, and together with the text description, explain the principle of the utility model. Obviously, the drawings described below are only some embodiments of the utility model, and are not used to limit the implementation of the utility model. For ordinary technicians in this field, other drawings can be derived from these drawings without creative work. The provided drawings include:

[0022] Figure 1 This is the first preferred embodiment of the utility model, a three-dimensional schematic diagram of a quantum dot cholesterol liquid crystal display device;

[0023] Figure 2 This is the first preferred embodiment of the utility model, a cross-sectional schematic diagram of a quantum dot cholesterol liquid crystal display device;

[0024] Figure 3 This is a schematic diagram of a configuration method of a blue light LED element in the first preferred embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of another implementation of the quantum dot light-guiding structure in the first preferred embodiment of the utility model;

[0026] Figure 5 yes Figure 1A part in the figure is enlarged, showing the schematic diagram of the combination of the blue light LED element and the conductive layer;

[0027] Figure 6 This is a second preferred embodiment of the present invention, a three-dimensional schematic diagram of a quantum dot cholesterol liquid crystal display device;

[0028] Figure 7 This is a cross-sectional schematic diagram of a quantum dot cholesterol liquid crystal display device, which is a second preferred embodiment of the present utility model;

[0029] Figure 8 It is a schematic diagram of another implementation of the first quantum dot light guiding structure, the second quantum dot light guiding structure, and the light guiding homogenizing structure in the second preferred embodiment of the utility model;

[0030] Fig. 9 This is another configuration of the reflective sheet in the second preferred embodiment of the present invention.

[0031] Reference numerals:

[0032] Quantum dot cholesteric liquid crystal display device 1, quantum dot cholesteric liquid crystal display device 3, cholesteric liquid crystal display module 10, first cholesteric liquid crystal display module 10, lower glass 101, first lower glass 101, upper glass 102, first upper glass 102, cholesteric liquid crystal unit 103, first cholesteric liquid crystal unit 103, first accommodating space 104, first accommodating space 104, quantum dot light guide structure 105, first quantum dot light guide structure 105, light scattering particles 1051, first light scattering particles 1051, quantum dots 1052, first quantum dots 1052, flexible circuit board 106, first flexible circuit board 106, conductive layer 108, first conductive layer 108, perforation 1081, first perforation 1081, conductive sheet 1082, first conductive sheet 1082, blue light LED element 109, first blue light LED element 109, first reflective sheet 110

[0033] The second cholesteric liquid crystal display module 20, the second lower glass 201, the second upper glass 202, the second cholesteric liquid crystal unit 203, the second accommodating space 204, the second quantum dot light guide structure 205, the second light scattering particles 2051, the second quantum dots 2052, the second flexible circuit board 206, the second conductive layer 208, the second blue light LED element 209, and the second reflective sheet 210

[0034] The third cholesteric liquid crystal display module 30, the third lower glass 301, the third upper glass 302, the third cholesteric liquid crystal unit 303, the third accommodating space 304, the light-guiding homogenizing structure 305, the third light-scattering particles 3051, the third flexible circuit board 306, the third conductive layer 308, and the third blue light LED element 309 DETAILED DESCRIPTION

[0035] The specific structural and functional details disclosed in the description of the utility model are only representative and are for the purpose of describing exemplary embodiments of the utility model. The utility model can be specifically implemented in many alternative forms and should not be interpreted as being limited to only the embodiments disclosed herein.

[0036] It should be understood that the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. in the description of the present utility model indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. Except for the applicant's special emphasis and limitation of their functional roles, they are only for the convenience of describing the present utility model, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as relative importance or the number of implied technical features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variation thereof means "at least including".

[0037] It should also be understood that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" in the description of the present invention should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrally formed connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. A person of ordinary skill in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0038] Unless the context clearly indicates otherwise, the terms "one", "an item" in the description of the utility model are also intended to include the plural. It should also be understood that the terms "include" and / or "comprise" stipulate the existence of the stated features, steps, operations, units and / or components, but do not exclude the existence or addition of one or more other features, steps, operations, units, components and / or combinations thereof.

[0039] The purpose of the utility model is to provide a quantum dot cholesterol liquid crystal display device, which utilizes embedded blue light LED components and quantum dot light-guiding structures to provide monochrome or full-color display effects without the need for an external light source.

[0040] The first preferred embodiment of the present invention is a quantum dot cholesterol liquid crystal display device 1, see Figures 1 to 5The quantum dot cholesteric liquid crystal display device 1 has a cholesteric liquid crystal display module 10, which includes a lower glass 101, a conductive layer 108, a cholesteric liquid crystal unit 103, an upper glass 102, a flexible circuit board 106, and a plurality of blue light LED elements 109 connected in sequence. The flexible circuit board 106 is disposed on the lower glass 101 and is electrically connected to the conductive layer 108.

[0041] The horizontal projection of the upper glass 102 is larger than and covers the horizontal projection of the cholesterol liquid crystal unit 103, and the horizontal projection of the lower glass 101 is larger than and covers the horizontal projection of the upper glass 102. Therefore, an accommodation space 104 is formed at the side of the upper glass 102 and at the intersection area above the lower glass 101. Figure 2 As shown in FIG. 1 . The blue LED element 109 is a self-contained light source of the cholesteric liquid crystal display module 10, and is disposed in the accommodation space 104 and is electrically connected to the conductive layer 108. Since the upper glass 102 has four sides, the blue LED element 109 is disposed outside at least one side of the upper glass 102 to emit light into the upper glass 102. For a cholesteric liquid crystal display module 10 of a larger size, the blue LED element 109 can also be disposed on two adjacent sides of the upper glass 102, two opposite sides, or even on the upper glass 102. Figure 3 Four sides shown.

[0042] In principle, the light emitted by the blue LED element 109 is not emitted in a single direction, but in a fan shape. In a common implementation, the top surface of the LED die in the blue LED element 109 is facing upward, and the center of the light emitting angle of the blue LED element 109 is perpendicular to the upper glass 102. However, if a better effect of light entering the upper glass 102 is to be achieved, in another implementation of this embodiment, please refer to Figure 2 , the center of the light emitting angle of the blue LED element 109 is perpendicular to the normal line of the upper glass 102, and most of the light excited by the blue LED element 109 can be directly emitted into the upper glass 102. In other words, the top surface of the LED die in the blue LED element 109 is facing the side of the upper glass 102, and the blue LED element 109 is connected to the conductive layer 108 on the lower glass 101.

[0043] Basically, LED is a point light source, and the uniform light effect is poor. In order to achieve better light guiding and uniform light effect, the quantum dot cholesterol liquid crystal display device 1 also includes a quantum dot light guiding structure 105, which is arranged between the blue light LED element 109 and the upper glass 102, see Figure 2 and Figure 5The quantum dot light-guiding structure 105 is mixed with a plurality of light-transmitting scattered light particles 1051, whose refractive index is different from that of the quantum dot light-guiding structure 105 itself. When light encounters the light-transmitting scattered light particles 1051, interface refraction and interface reflection will occur at the interface between the quantum dot light-guiding structure 105 and the scattered light particles 1051, and the directions of the refracted light and the reflected light are different from the direction of the incident light. Therefore, when the scattered light particles 1051 are small in size and the number reaches a certain level, the light can be homogenized by scattered light.

[0044] In this embodiment, the quantum dot light guide structure 105 is further mixed with a plurality of quantum dots 1052, the diameter of which is less than 8 nanometers. After absorbing blue light, the quantum dots 1052 will stimulate other colored light, such as red light or green light. In other words, the blue light stimulated by the blue light LED element 109 is absorbed by the quantum dots 1052 and stimulates other colored light. After the light guiding and light homogenizing effect of the quantum dot light guide structure 105 and the light scattering particles 1051, the blue light can be more evenly emitted into the upper glass 102, serving as the light source of the cholesterol liquid crystal unit 103.

[0045] Quantum dots are zero-dimensional nano-semiconductor materials. Common quantum dots include nanocrystals, atomic clusters, C60 molecules, and some nano-semiconductor devices. Quantum dots have novel electronic and optical properties and can be applied in a variety of fields. Quantum dots are composed of a small number of atoms and are generally spherical or quasi-spherical in shape. The movement of electrons inside quantum dots in three spatial directions is limited, and the sizes in three dimensions are all below 10 nanometers (nanometers), so the quantum confinement effect is particularly significant. This quantum confinement effect makes the energy levels discrete, that is, the energy of electrons in quantum dots is quantized.

[0046] The size of quantum dots determines the quantum fluorescence color. Due to the discrete energy levels, the transition of electrons between these energy levels will stimulate light of a specific wavelength, and the discrete energy level spacing is determined by the size of the quantum dots. Therefore, quantum dots of different sizes will stimulate different colors of fluorescence after being excited. Therefore, we can flexibly adjust the particle size of monochromatic quantum dots according to demand, so that the quantum dot spectrum can more realistically restore the original color of the object, and its color rendering can theoretically be close to that of sunlight.

[0047] Quantum dot luminescence can be divided into photoluminescence (PL) and electroluminescence (EL). Photoluminescence is when photons excite quantum dots to emit light, and electroluminescence is when electrons excite quantum dots to emit light. The present invention uses photoluminescence, that is, using blue light to excite quantum dots to emit light.

[0048] In this embodiment, preferably, the diameter of the quantum dot 1052 is set to 6.0-8.0 nanometers, and the quantum dot 1052 will stimulate red light after absorbing blue light. If the diameter of the quantum dot 1052 is set to 3.0-4.5 nanometers, the quantum dot 2052 will stimulate green light after absorbing blue light.

[0049] In this embodiment, in order to achieve a better light guiding effect, for a relatively thin blue LED element 109, the quantum dot light guiding structure 105 further extends to cover the blue LED element 109, such as Figure 4 As shown, the light emitted upward by the blue LED element 109 can also excite the quantum dots to excite other color lights, which are then guided into the upper glass 102 .

[0050] In order to reduce the thickness of the overall quantum dot cholesterol liquid crystal display device 1, the lower glass 101 and the upper glass 102 are preferably thin glass sheets with a thickness of 0.1 to 0.7 mm. The blue light LED element 109 is a packaged LED, and an unpackaged micro-LED or a mini-LED with a base can also be used. Due to the small size of micro-LED and mini-LED, they can be arranged more densely after forming an LED array. If used as a light source, the difference in brightness can be reduced, and the overall light uniformity is better.

[0051] The blue LED element 109 is electrically connected to the conductive layer 108, preferably, by anisotropic conductive adhesive, lead-free solder or other metal welding. In addition, other methods can also be used for electrical connection, such as Figure 5 As shown, the quantum dot cholesterol liquid crystal display device 1 also includes a plurality of conductive sheets 1082, and the conductive layer 108 is further formed with a plurality of through holes 1081, the blue light LED element 109 is electrically fixed to the conductive sheet 1082, and the conductive sheet 1082 is fixed to the lower glass 101 through the through holes 1081 and is electrically connected to the conductive layer 108.

[0052] Based on the same technical concept, the present invention further proposes a second preferred embodiment, which is a quantum dot cholesterol liquid crystal display device 3, see Figure 6 To Fig. 9 .

[0053] The quantum dot cholesteric liquid crystal display device 3 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 stacked in order from bottom to top. The composition and features of the first cholesteric liquid crystal display module 10 are the same as those of the aforementioned first preferred embodiment, and the structures of the second cholesteric liquid crystal display module 20 and the third cholesteric liquid crystal display module 30 are similar to the first cholesteric liquid crystal display module 10.

[0054] The first cholesteric liquid crystal display module 10 comprises, from bottom to top, a first lower glass 101, a first conductive layer 108, a first cholesteric liquid crystal unit 103, a first upper glass 102, and a first flexible circuit board 106 disposed on the first lower glass 101 and electrically connected to the first conductive layer 108. The horizontal projection of the first upper glass 102 is larger than and covers the horizontal projection of the first cholesteric liquid crystal unit 103, 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 accommodating space 104 is formed at the side of the first upper glass 102 and at the intersection area above the first lower glass 101.

[0055] The second cholesteric liquid crystal display module 20 includes, from bottom to top, a second lower glass 201, a second conductive layer 208, a second cholesteric liquid crystal unit 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 unit 203, the horizontal projection of the second lower glass 201 is larger than and covers the horizontal projection of the second upper glass 202, and a second accommodating space 204 is formed at the side of the second upper glass 202 and at the intersection area above the second lower glass 201.

[0056] The third cholesteric liquid crystal display module 30 comprises, from bottom to top, a third lower glass 301, a third conductive layer 308, a third cholesteric liquid crystal unit 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 unit 303, the horizontal projection of the third lower glass 301 is larger than and covers the horizontal projection of the third upper glass 302, and a third accommodating space 304 is formed at the side of the third upper glass 302 and at the intersection area above the third lower glass 301.

[0057] The quantum dot cholesteric liquid crystal display device 3 further includes a plurality of first blue LED elements 109, a plurality of second blue LED elements 209, and a plurality of third blue LED elements 309. The first blue LED element 109 is provided as a self-contained light source of the first cholesteric liquid crystal display module 10, and is disposed in the first accommodation space 104, and is electrically connected to the first conductive layer 108. The second blue LED element 209 is provided as a self-contained light source of the second cholesteric liquid crystal display module 20, and is disposed in the second accommodation space 204, and is electrically connected to the second conductive layer 208. The third blue LED element 309 is provided as a self-contained light source of the third cholesteric liquid crystal display module 30, and is disposed in the third accommodation space 304, and is electrically connected to the third conductive layer 308.

[0058] The first upper glass 102 has four sides, and the first blue LED element 109 is arranged outside at least one side of the first upper glass 102. For a quantum dot cholesterol liquid crystal display device 3 of a larger size, the first blue LED element 109 can also be arranged on two adjacent sides, two opposite sides, or even four sides of the first upper glass 102. Similarly, the second blue LED element 209 is arranged outside at least one side of the second upper glass 202, or on two adjacent sides, two opposite sides, or even four sides of the second upper glass 202. Similarly, the third blue LED element 309 is arranged outside at least one side of the third upper glass 302, or on two adjacent sides, two opposite sides, or even four sides of the third upper glass 302.

[0059] In a cross-sectional view, the light emitted by the first blue LED element 109 is not in a single direction in principle, but in a fan shape. In a common implementation, the top surface of the LED die in the first blue LED element 109, the second blue LED element 209, and the third blue LED element 309 is facing upward. In other words, the center of the light-emitting angle of the first blue LED element 109 is perpendicular to the first upper glass 102, the center of the light-emitting angle of the second blue LED element 209 is perpendicular to the second upper glass 202, and the center of the light-emitting angle of the third blue LED element 309 is perpendicular to the third upper glass 302.

[0060] However, if a better effect of light entering the upper glass is to be achieved, in another implementation of this embodiment, please refer to Figure 7 , the center of the light-emitting angle of the first blue LED element 109 is perpendicular to the normal of the first upper glass 102, the center of the light-emitting angle of the second blue LED element 209 is perpendicular to the normal of the second upper glass 202, and the center of the light-emitting angle of the third blue LED element 309 is perpendicular to the normal of the third upper glass 302. That is, the top surface of the LED crystal in the first blue LED element 109 faces the side of the first upper glass 102, and the first blue LED element 109 is connected to the first conductive layer 108 on the first lower glass 101. The top surface of the LED crystal in the second blue LED element 209 faces the side of the second upper glass 202, and the second blue LED element 209 is connected to the second conductive layer 208 on the second lower glass 201. The top surface of the LED crystal in the third blue LED element 309 faces the side of the third upper glass 302, and the third blue LED element 309 is connected to the third conductive layer 308 on the third lower glass 301. Thus, most of the light can be directly emitted into the first upper glass 102 , the second upper glass 202 , and the third upper glass 302 .

[0061] In order to achieve better light guiding and light homogenizing effects, the quantum dot cholesterol liquid crystal display device 3 further includes a first quantum dot light guiding structure 105, a second quantum dot light guiding structure 205, and a light guiding and light homogenizing structure 305. The first quantum dot light guiding structure 105 is disposed between the first blue light LED element 109 and the first upper glass 102, the second quantum dot light guiding structure 205 is disposed between the second blue light LED element 209 and the second upper glass 202, and the light guiding and light homogenizing structure 305 is disposed between the third blue light LED element 309 and the third upper glass 302.

[0062] The first quantum dot light-guiding structure 105 is mixed with a plurality of first light-scattering particles 1051 that are transparent, the second quantum dot light-guiding structure 205 is mixed with a plurality of second light-scattering particles 2051 that are transparent, and the light-guiding homogenizing structure 305 is mixed with a plurality of third light-scattering particles 3051 that are transparent. The refractive index of the first light-scattering particles 1051 is different from that of the first quantum dot light-guiding structure 105 itself. When light encounters the first light-scattering particles 1051, interface refraction and interface reflection will occur at the interface of the first light-scattering particles 1051, and the directions of the refracted light and the reflected light are different from the direction of the incident light. The refractive index of the second light-scattering particles 2051 is different from that of the second quantum dot light-guiding structure 205 itself. When light encounters the second light-scattering particles 2051, interface refraction and interface reflection will occur at the interface of the second light-scattering particles 2051, and the directions of the refracted light and the reflected light are different from the direction of the incident light. The refractive index of the third light scattering particles 3051 is different from that of the light guiding homogenizing structure 305 itself. When light encounters the third light scattering particles 3051, interface refraction and interface reflection will occur at the interface of the third light scattering particles 3051. The directions of the refracted light and the reflected light are different from the direction of the incident light. Therefore, when the sizes of the first light scattering particles 1051, the second light scattering particles 2051, and the third light scattering particles 3051 are small and the number reaches a certain level, the light homogenizing effect can be achieved.

[0063] In order to achieve a better light guiding effect, for the first blue light LED element 109, the second blue light LED element 209, and the third blue light LED element 309, which are relatively thin, the first quantum dot light guiding structure 105 further extends to cover the first blue light LED element 109, the second quantum dot light guiding structure 205 further extends to cover the second blue light LED element 209, and the light guiding homogenizing structure 305 further extends to cover the third blue light LED element 309. Figure 8 As shown, the light emitted upward by the first blue LED element 109 , the second blue LED element 209 , and the third blue LED element 309 can also be guided into the first upper glass 102 , the second upper glass 202 , and the third upper glass 302 , respectively.

[0064] In this embodiment, a plurality of first quantum dots 1052 are further mixed in the first quantum dot light guide structure 105, and a plurality of second quantum dots 2052 are further mixed in the second quantum dot light guide structure 205, and the diameter size is all below 8 nanometers, but the diameter size of the first quantum dot 1052 is different from that of the second quantum dot 2052. The first quantum dot 1052 will excite the first color light after absorbing blue light, and the second quantum dot 2052 will excite the second color light after absorbing blue light. Since the diameter size of the first quantum dot 1052 is different from that of the second quantum dot 2052, the wavelength range of the first color light is different from that of the second color light. In this embodiment, preferably, the diameter size of the first quantum dot 1052 is set to 6.0 to 8.0 nanometers, and the first quantum dot 1052 will excite red light after absorbing blue light. The diameter size of the second quantum dot 2052 is set to 3.0 to 4.5 nanometers, and the second quantum dot 1052 will excite green light after absorbing blue light. It should be noted that the light-guiding homogenizing structure 305 does not need to be doped with quantum dots, and the blue light emitted by the third blue light LED element 309 can be retained.

[0065] That is, the blue light emitted by the first blue LED element 109 is absorbed by the first quantum dot 1052 and then stimulated to produce the first color light, for example, red light. After the light guiding and light homogenizing effect of the first quantum dot light guide structure 105 and the first light scattering particles 1051, the red light can be uniformly emitted into the first upper glass 102, and serves as the light source of the first cholesteric liquid crystal display module 10. The blue light emitted by the second blue LED element 209 is absorbed by the second quantum dot 2052 and then stimulated to produce the second color light, for example, green light. After the light guiding and light homogenizing effect of the second quantum dot light guide structure 205 and the second light scattering particles 2051, the green light can be uniformly emitted into the second upper glass 202, and serves as the light source of the second cholesteric liquid crystal display module 20. The blue light emitted by the third blue LED element 309 can be uniformly incident into the third upper glass 302 after being guided and homogenized by the light-guiding and homogenizing structure 305 and the third light-scattering particles 3051, and serves as the light source of the third cholesterol liquid crystal display module 30. In this way, the first cholesterol liquid crystal display module 10 reflects red light, the second cholesterol liquid crystal display module 20 reflects green light, and the third cholesterol liquid crystal display module 30 reflects blue light, and the quantum dot cholesterol liquid crystal display device 3 can display in full color.

[0066] In order to reduce the thickness of the overall quantum dot cholesterol liquid crystal display device 3, the first lower glass 101, the first upper glass 102, the second lower glass 201, the second upper glass 202, the third lower glass 301 and the third upper glass 302 are preferably thin glass sheets with a thickness of 0.1 to 0.7 mm. The first blue light LED element 109, the second blue light LED element 209, and the third blue light LED element 309 are packaged LEDs, and unpackaged micro-LEDs or mini-LEDs with bases can also be used. Due to the small size of micro-LEDs and mini-LEDs, they can be arranged more densely after forming an LED array. If used as a light source, the difference in brightness can be reduced, and the overall light uniformity is better.

[0067] The first blue LED element 109 is electrically connected to the first conductive layer 208, the second blue LED element 209 is electrically connected to the second conductive layer 208, and the third blue LED element 309 is electrically connected to the third conductive layer 208. Preferably, the electrical connection can be made by anisotropic conductive adhesive, lead-free solder or other metal welding. In addition, other electrical connection methods can also be used. For example, the first cholesterol liquid crystal display module 10 also includes a plurality of first conductive sheets 1082, and the first conductive layer 108 is further formed with a plurality of first through holes 1081. The first blue LED element 109 is electrically fixed to the first conductive sheet 1082, and the first conductive sheet 1082 is fixed to the first lower glass 101 through the first through holes 1081 and is electrically connected to the first conductive layer 108. The second cholesteric liquid crystal display module 20 further includes a plurality of second conductive sheets, the second conductive layer 208 further includes a plurality of second through-holes, the second blue LED element 209 is electrically fixed to the second conductive sheets, the second conductive sheets are fixed to the second lower glass 201 through the second through-holes, and are electrically connected to the second conductive layer 208. The third cholesteric liquid crystal display module 30 further includes a plurality of third conductive sheets, the third conductive layer 308 further includes a plurality of third through-holes, the third blue LED element 309 is electrically fixed to the third conductive sheets, the third conductive sheets are fixed to the third lower glass 301 through the third through-holes, and are electrically connected to the third conductive layer 308.

[0068] In this embodiment, the quantum dot cholesterol liquid crystal display device 3 has three cholesterol liquid crystal display modules, namely, the first cholesterol liquid crystal display module 10, the second cholesterol liquid crystal display module 20, and the third cholesterol liquid crystal display module 30, so the quantum dot cholesterol liquid crystal display device 3 can be full-color display. By adjusting the particle size of the first quantum dot 1052 and the second quantum dot 2052, the first cholesterol liquid crystal display module 10 can display a red picture, the second cholesterol liquid crystal display module 20 can display a green picture, and the third cholesterol liquid crystal display module 30 can display a blue picture.

[0069] On the other hand, since the first blue LED element 109 and the second blue LED element 209 both emit light upward, the light will penetrate the second lower glass 201 and the third lower glass 301 respectively, affecting vision. Therefore, in a preferred embodiment, the present embodiment further provides a first reflective sheet 110 and a second reflective sheet 210, such as Figure 8 and Fig. 9 As shown. The first reflector 110 is disposed on the second lower glass 201 and is located relative to the plurality of first blue LED elements 109, and is used to reflect the emitted light from the first blue LED elements 109 that penetrates the first quantum dot light guide structure 105 back into the first quantum dot light guide structure 105 for light guiding. The second reflector 210 is disposed on the third lower glass 301 and is located relative to the plurality of second blue LED elements 209, and is used to reflect the emitted light from the second blue LED elements 209 that penetrates the second quantum dot light guide structure 205 back into the second quantum dot light guide structure 205 for light guiding. Considering the manufacturing process, if etching technology is used, the first reflector 110 can be disposed above the second lower glass 201 by etching technology, and the second reflector 210 can be disposed above the third lower glass 301, as shown. Figure 8 If screen printing technology is used, the first reflective sheet 110 can be disposed below the second lower glass 201 by screen printing, and the second reflective sheet 210 can be disposed below the third lower glass 301, as shown. Fig. 9 shown.

[0070] Since the first quantum dot light guide structure 105 is mixed with the transparent first light scattering particles 1051 for light uniformity, the width of the light range of the first blue LED element 109 penetrating the first quantum dot light guide structure 105 and reaching the first reflector 110 will be wider than the width of the light range emitted from the first blue LED element 109. Therefore, the width of the first reflector 110 should be greater than the width of the first blue LED element 109, and preferably more than 1.5 times the width of the first blue LED element 109. Similarly, the width of the second reflector 210 should be greater than the width of the second blue LED element 209, and preferably more than 1.5 times the width of the second blue LED element 209.

[0071] In summary, the utility model is characterized in that:

[0072] 1. A blue LED element is arranged in the accommodation space formed on the lower glass and the side of the upper glass in the cholesterol liquid crystal display module;

[0073] Second, a quantum dot light-guiding structure is filled between the upper glass side and the blue LED element, in which light-transmitting and light-scattering particles are mixed to serve as a light-guiding plate for guiding and homogenizing light.

[0074] The quantum dot light guide structure is also mixed with quantum dots, which can stimulate different colored lights after absorbing the blue light emitted by the blue LED element. After the light guiding and light homogenizing effect of the quantum dot light guide structure and the light-transmitting scattered light particles, the light can be more evenly emitted into the upper glass to serve as the embedded light source of the cholesterol liquid crystal display module. In this way, the quantum dot cholesterol liquid crystal display device of the utility model can provide monochrome or full-color display effects without external light source irradiation.

[0075] The above preferred embodiments are described in detail to more clearly describe the features and spirit of the present invention, but are not intended to limit the scope of the present invention by the preferred embodiments disclosed above. On the contrary, the purpose is to cover various equivalent changes within the scope of the claims to be applied for the present invention.

Claims

1. A quantum dot cholesteric liquid crystal display device, comprising a cholesteric liquid crystal display module (10), wherein the cholesteric liquid crystal display module (10) comprises a lower glass (101), a conductive layer (108), a cholesteric liquid crystal unit (103), an upper glass (102), and a flexible circuit board (106) disposed on the lower glass (101) and electrically connected to the conductive layer (108), wherein the horizontal projection of the upper glass (102) is larger than and covers the horizontal projection of the cholesteric liquid crystal unit (103); Features: The horizontal projection of the lower glass (101) is larger than and covers the horizontal projection of the upper glass (102), and an accommodating space (104) is formed at the side of the upper glass (102) and at the intersection area above the lower glass (101); The quantum dot cholesteric liquid crystal display device further comprises a plurality of blue light LED elements (109), which are arranged in the accommodation space (104) and outside at least one side of the upper glass (102), and are electrically connected to the conductive layer (108); The quantum dot cholesterol liquid crystal display device also includes a quantum dot light guide structure (105), which is arranged between the blue light LED element (109) and the upper glass (102), and excites other color lights after absorbing blue light, which are guided and homogenized by the quantum dot light guide structure (105) and then emitted into the upper glass (102).

2. The quantum dot cholesteric liquid crystal display device according to claim 1, characterized in that: The quantum dot light-guiding structure (105) extends to cover the blue light LED element (109).

3. The quantum dot cholesteric liquid crystal display device according to claim 1, characterized in that: The lower glass (101) and the upper glass (102) are thin glass sheets with a thickness of 0.1 to 0.7 mm, and the blue light LED element (109) is a general packaged LED, an unpackaged micro-LED, or a mini-LED with a base.

4. The quantum dot cholesteric liquid crystal display device according to claim 1, characterized in that: The blue light LED element (109) is electrically connected to the conductive layer (108) by means of anisotropic conductive adhesive, lead-free solder or other metal welding methods.

5. The quantum dot cholesteric liquid crystal display device according to claim 1, characterized in that: The quantum dot cholesterol liquid crystal display device also includes a plurality of conductive sheets (1082), the conductive layer (108) is further formed with a plurality of through holes (1081), the blue light LED element (109) is electrically fixed to the conductive sheet (1082), the conductive sheet (1082) is fixed to the lower glass (101) through the through holes (1081), and is electrically connected to the conductive layer (108).

6. The quantum dot cholesteric liquid crystal display device according to claim 1, characterized in that: The blue light LED element (109) and the quantum dot light guide structure (105) are arranged outside the four side edges of the upper glass (102).

7. A quantum dot cholesteric liquid crystal display device, comprising 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) stacked from bottom to top; the first cholesteric liquid crystal display module (10) comprises a first lower glass (101), a first conductive layer (108), a first cholesteric liquid crystal unit (103), a first upper glass (102), and a first flexible circuit board (106) arranged on the first lower glass (101) and electrically connected to the first conductive layer (108), wherein the horizontal projection of the first upper glass (102) is larger than and covers the horizontal projection of the first cholesteric liquid crystal unit (103); the second cholesteric liquid crystal display module (20) comprises a second lower glass (201), a second conductive layer (208), a first cholesteric liquid crystal unit (103), a first upper glass (102), and a first flexible circuit board (106) arranged on the first lower glass (101) and electrically connected to the first conductive layer (108), wherein the horizontal projection of the first upper glass (102) is larger than and covers the horizontal projection of the first cholesteric liquid crystal unit (103); 8), a second cholesteric liquid crystal unit (203), a second upper glass (202), and a second flexible circuit board (206) arranged on the second lower glass (201) and electrically connected to the second conductive layer (208), wherein the horizontal projection of the second upper glass (202) is larger than and covers the horizontal projection of the second cholesteric liquid crystal unit (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 unit (303), a third upper glass (302), and a third flexible circuit board (306) arranged on the third lower glass (301) and electrically connected to the third conductive layer (308), wherein the horizontal projection of the third upper glass (302) is larger than and covers the horizontal projection of the third cholesteric liquid crystal unit (303); Features: 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 accommodation space (104) is formed at the side of the first upper glass (102) and at the intersection area above the first lower glass (101); the horizontal projection of the second lower glass (201) is larger than and covers the horizontal projection of the second upper glass (202), and a second accommodation space (204) is formed at the side of the second upper glass (202) and at the intersection area above the second lower glass (201); the horizontal projection of the third lower glass (301) is larger than and covers the horizontal projection of the third upper glass (302), and a third accommodation space (304) is formed at the side of the third upper glass (302) and at the intersection area above the third lower glass (301); The quantum dot cholesteric liquid crystal display device further comprises a plurality of first blue light LED elements (109), a plurality of second blue light LED elements (209), and a plurality of third blue light LED elements (309), wherein the first blue light LED elements (109) are arranged in the first accommodating space (104), outside at least one side of the first upper glass (102), and electrically connected to the first conductive layer (108); the second blue light LED elements (209) are arranged in the second accommodating space (204), outside at least one side of the second upper glass (202), and electrically connected to the second conductive layer (208); the third blue light LED elements (309) are arranged in the third accommodating space (304), outside at least one side of the third upper glass (302), and electrically connected to the third conductive layer (308); The quantum dot cholesteric liquid crystal display device further comprises a first quantum dot light guiding structure (105), a second quantum dot light guiding structure (205), and a light guiding and homogenizing structure (305); the first quantum dot light guiding structure (105) is arranged between the first blue light LED element (109) and the first upper glass (102); the first quantum dot light guiding structure (105) absorbs blue light and excites a first color light different from the blue light, which is guided and homogenized by the first quantum dot light guiding structure (105) and then emitted into the first upper glass (102); The second quantum dot light guide structure (205) is arranged between the second blue light LED element (209) and the second upper glass (202); the second quantum dot light guide structure (205) absorbs blue light and excites a second color light different from the blue light; after light is guided and homogenized by the second quantum dot light guide structure (205), the second color light is emitted into the second upper glass (202); the wavelength range of the second color light is different from the wavelength range of the first color light; The light-guiding and light-homogenizing structure (305) is arranged between the third blue light LED element (309) and the third upper glass (302); the blue light emitted by the third blue light LED element (309) is guided and homogenized by the light-guiding and light-homogenizing structure (305) before being emitted into the third upper glass (302).

8. The quantum dot cholesteric liquid crystal display device according to claim 7, characterized in that: The first quantum dot light-guiding structure (105) extends to cover the first blue light LED element (109), the second quantum dot light-guiding structure (205) extends to cover the second blue light LED element (209), and the light-guiding homogenizing structure (305) extends to cover the third blue light LED element (309).

9. The quantum dot cholesteric liquid crystal display device according to claim 7, characterized in that: The first lower glass (101), the first upper glass (102), the second lower glass (201), the second upper glass (202), the third lower glass (301), and the third upper glass (302) are thin glass sheets with a thickness of 0.1 to 0.7 mm; the first blue light LED element (109), the second blue light LED element (209), and the blue light LED element (109) are generally packaged LEDs, unpackaged micro-LEDs, or mini-LEDs with a base.

10. The quantum dot cholesteric liquid crystal display device according to claim 7, characterized in that: The first blue light LED element (109) is electrically connected to the first conductive layer (108) by means of anisotropic conductive adhesive, lead-free solder or other metal welding methods, the second blue light LED element (209) is electrically connected to the second conductive layer (208) by means of anisotropic conductive adhesive, lead-free solder or other metal welding methods, and the third blue light LED element (309) is electrically connected to the third conductive layer (308) by means of anisotropic conductive adhesive, lead-free solder or other metal welding methods.

11. The quantum dot cholesteric liquid crystal display device according to claim 7, characterized in that: The quantum dot cholesterol liquid crystal display device further comprises a plurality of first conductive sheets (1082), a plurality of second conductive sheets and a plurality of third conductive sheets; The first conductive layer (108) is further formed with a plurality of first through holes (1081); the first blue LED element (109) is electrically fixed to the first conductive sheet (1082); the first conductive sheet (1082) is fixed to the first lower glass (101) through the first through holes (1081) and is electrically connected to the first conductive layer (108); The second conductive layer (208) is further formed with a plurality of second through holes, the second blue LED element (209) is electrically fixed to the second conductive sheet, the second conductive sheet is fixed to the second lower glass (201) through the second through holes, and is electrically connected to the second conductive layer (208); The third conductive layer (308) is also formed with a plurality of third through holes, the third blue light LED element (309) is electrically fixed to the third conductive sheet, the third conductive sheet is fixed to the third lower glass (301) through the third through holes, and is electrically connected to the third conductive layer (308).

12. The quantum dot cholesteric liquid crystal display device according to claim 7, characterized in that: The first blue light LED element (109) and the first quantum dot light guide structure (105) are arranged outside the four sides of the first upper glass (102), the second blue light LED element (209) and the second quantum dot light guide structure (205) are arranged outside the four sides of the second upper glass (202), and the third blue light LED element (309) and the light guide homogenizing structure (305) are arranged outside the four sides of the third upper glass (302).

13. The quantum dot cholesteric liquid crystal display device according to claim 7, characterized in that: The invention also includes a first reflective sheet (110) and a second reflective sheet (210), wherein the first reflective sheet (110) is arranged on the second lower glass (201) and is located relative to the plurality of first blue light LED elements (109), and the second reflective sheet (210) is arranged on the third lower glass (301) and is located relative to the plurality of second blue light LED elements (209).

Images