JP2020531904A - High dynamic range micro LED backlighting system and method - Google Patents

Abstract

The present embodiment relates to lighting systems and methods, and in particular to systems and methods that provide light to display devices.

Description

Cross-reference of related applications

This application is under Article 119 of the US Patent Law, US Provisional Patent Application Nos. 62/689, 980 filed June 26, 2018, and US Provisional Patent Application No. 62/549 filed August 24, 2017. Claiming the priority of No. 531 and the content of each provisional application is relied upon and incorporated herein by reference in its entirety.

The present embodiment relates to lighting systems and methods, and in particular to systems and methods that provide light to display devices.

In some cases, the backlight is configured with a quantum dot enhancement film (QDEF) located between a printed circuit board (PCB) with a blue light emitting diode (LED) array and a liquid crystal display (LCD) panel. To. It is necessary that the LED array and the QDEF are substantially separated from each other in order to spread the light from the LED. The need for separation limits the production of thin display devices.

Therefore, at least for the above reasons, there is a need for display device lighting systems and methods that are more advanced than conventional techniques.

The present embodiment relates to lighting systems and methods, and in particular to systems and methods that provide light to display devices.

This overview only outlines some embodiments of the present invention. Terms such as "in one embodiment", "according to one embodiment", "in various embodiments", "in one or more embodiments", "in a particular embodiment" are generally those. It means that the features, structures or features described following the phrase are included in at least one embodiment and may be included in more than one embodiment. Importantly, such terms do not necessarily refer to the same embodiment. Many other embodiments of the invention will be more fully apparent from the following detailed description, the accompanying claims, and the accompanying drawings.

Various embodiments can be further understood by reference to the drawings described in the following parts of the specification. In the drawings, similar reference numbers are used to indicate similar components in some drawings. In some cases, the reference number is subscripted with an auxiliary label to indicate one of many similar components. If there is an auxiliary label and the reference number is given without specifying it, it is intended to refer to all of such a large number of similar components.

Shown are micro LED backlights that include zone dividers according to some embodiments. Various treatment steps that can be used alone or in combination to produce the backlight according to some embodiments are shown. Various treatment steps that can be used alone or in combination to produce the backlight according to some embodiments are shown. Various treatment steps that can be used alone or in combination to produce the backlight according to some embodiments are shown. Various treatment steps that can be used alone or in combination to produce the backlight according to some embodiments are shown. Various treatment steps that can be used alone or in combination to produce the backlight according to some embodiments are shown. Various treatment steps that can be used alone or in combination to produce the backlight according to some embodiments are shown. Various treatment steps that can be used alone or in combination to produce the backlight according to some embodiments are shown. Various treatment steps that can be used alone or in combination to produce the backlight according to some embodiments are shown. A display device including the backlight of FIG. 1a is shown. It shows other micro LED backlights formed without a substrate region segment according to various embodiments. A display device including the backlight of FIG. 2a is shown. Blue micro LEDs, red and green QDs, and yet other micro LED backlights with volume diffusers are shown according to various embodiments. A display device including the backlight of FIG. 3a is shown. Yet another micro LED backlight using a quantum dot enhanced film (QDEF) according to one or more embodiments is shown. A display device including the backlight of FIG. 4a is shown. Yet another micro LED backlight using a fluorophore-converted white micro LED according to some embodiments is shown. A display device including the backlight of FIG. 5a is shown. Yet other micro LED backlights with red / green / blue (RGB) micro LEDs according to various other embodiments are shown. A display device including the backlight of FIG. 6a is shown. Yet another micro LED backlight using a bottom emitting RGB micro LED according to one or more embodiments is shown. A display device including the backlight of FIG. 7a is shown. Yet another micro LED backlight using a bottom emitting blue micro LED according to some other embodiment is shown. A display device including the backlight of FIG. 8a is shown. It is a flowchart which shows the manufacturing method of the backlight type display device by various embodiments. It is a flowchart which shows the other manufacturing method of the backlight type display device by some Embodiment. The conventional backlight type display device is shown side by side with the reflection backlight type display device according to some embodiments, and the reduction in the thickness of the display device that can be realized by using the present embodiment is shown.

The present embodiment relates to lighting systems and methods, and in particular to systems and methods that provide light to display devices.

Various embodiments provide an LCD display device that includes an LCD panel and a micro LED backlight that is located relative to the LCD panel. The micro LED backlight includes a reflection forming portion, a transparent substrate, and at least one micro LED element. The micro LED element includes the reflection forming portion and the transparent base material so that the light emitted from at least one micro LED element is reflected from the reflection forming portion and transmitted through the transparent base material before reaching the LCD panel. They are placed relatively. In some cases, the heat sink is joined to the reflection forming part.

In some cases of the above embodiment, the reflection forming portion is (a) a quantum dot layer formed on another base material and a metal layer formed on the quantum dot layer. , (B) Quantum dot emphasizing film, (c) Quantum dot emphasizing film having a metal layer formed on one surface, (d) metal layer, (e) diffuse reflector arranged on the surface of a base material, or (F) It may be a quantum dot layer formed on the surface of the base material and a metal layer formed on the quantum dot layer.

In one or more of the above embodiments, the transparent substrate is made of glass. In some other cases of the above embodiments, the transparent substrate is formed of translucent alumina. In the specific case of the above embodiment, the micro LED is a white LED. In some such cases, the reflection-forming portion is, but is not limited to, a (a) metal layer or (b) a diffuse reflector located on the surface of the substrate. In other specific cases, the micro LED is a blue LED. In some such cases, the reflection forming part is, but is not limited to, (a) a quantum dot layer formed on another substrate and a metal layer formed on the quantum dot layer. (B) Quantum dot enhancement film, (c) Quantum dot enhancement film having a metal layer formed on one surface, or (d) Quantum dot layer formed on the surface of a base material, and on the quantum dot layer. It is a formed metal layer. In yet other specific cases, micro LEDs include red LEDs, green LEDs, and blue LEDs. In some such cases, the reflection-forming portion is (a) a metal layer and (b) a diffuse-reflecting portion located on the surface of the first substrate, without limitation.

Other embodiments provide a backlighting apparatus that includes a transparent substrate, a reflection forming section, and at least one micro LED. The reflection forming portion is formed on the first surface of the transparent base material, and the micro LED is formed on the second surface of the transparent base material. The micro LED is directed so that the light emitted from it passes through the transparent substrate and then is reflected from the reflection forming portion to generate reflected light. The reflected light passes through the transparent substrate before being provided as light emitted from the backlighting device. In some cases, the reflection forming part comprises a metal layer to which the heat sink is bonded.

In some cases where the micro LED of the above embodiment includes a blue LED, the reflection forming unit can act so as to color-convert the blue light emitted from the blue LED and reflect the red, green and blue component lights. Includes the quantum dot layer of. In some such cases, the quantum dot layer is placed on a transparent substrate and the quantum dot layer is sealed by a metal layer. In other cases where the micro LED of the above embodiment includes a blue LED, the reflection forming portion includes a QDEF.

In various cases of the above embodiment where the at least one micro LED comprises a red LED, a green LED, and a blue LED, the reflection forming portion is a diffuse reflection portion or a transparent base material arranged on the transparent base material. Includes a metal layer placed on top. In some cases of the above embodiments, the transparent substrate is formed of translucent alumina. In other cases of the above embodiments, the transparent substrate is made of glass.

Yet another embodiment provides a backlight that includes an illumination forming part and a reflection forming part. The illumination forming unit includes a transparent base material and at least one micro LED arranged on the surface of the transparent base material. The micro LED is directed so that the light emitted from it is directed away from the transparent substrate. The reflection forming portion includes a reflection layer. The reflection forming unit is located relative to the illumination forming unit so that the light emitted from at least one micro LED is reflected as reflected light from the reflecting layer, and the reflected light is the light emitted from the backlight device. As an emission, it penetrates a transparent substrate. In some cases, the reflection forming part comprises a metal layer to which the heat sink is bonded.

In some cases of the above embodiments, the transparent substrate is translucent alumina. In other cases of the above embodiment, the transparent substrate is glass. In various cases of the above embodiments, the surface of the transparent substrate on which the micro LEDs are arranged is the first surface of the transparent substrate, and the illumination forming portion is further formed on the second surface of the transparent substrate. Includes a glass volume diffuser. In some cases of the above embodiments, the micro LED is a blue LED. In some such cases, the reflective layer is a quantum dot-enhanced film capable of color-converting the blue light emitted from the blue LED to reflect the red, green and blue component lights, as well as the quantum. Includes a metal layer formed on the dot-enhancing film.

In various cases of the above embodiments, the transparent substrate is a first transparent substrate, and the reflection forming portion includes a reflective layer arranged on the second transparent substrate, from at least one micro LED. The emitted light passes through the second substrate before being reflected from the reflective layer. In the case where some such micro LEDs are blue LEDs, the reflective layer includes a quantum dot layer formed on a second transparent substrate and a metal layer formed on the quantum dot layer. In some cases, zone dividers are formed on the second transparent substrate. The zoning section indicates a tapered wall portion that extends at least partially between the first surface of the second transparent substrate and the second surface of the second transparent substrate. In some specific cases, the tapered side wall of the second transparent substrate is covered with a metal layer. In other specific cases, the tapered side wall of the second transparent substrate is covered with both a quantum dot layer and a metal layer.

Referring to FIG. 1a, a micro LED backlight 100 including zone dividers 140 (140a, 140b) between various zones according to some embodiments is shown. The micro LED backlight 100 includes an illumination forming unit 121 and a reflection forming unit 136.

The illumination forming unit 121 includes a scattering surface 105 arranged on the transparent layer 110. In some embodiments, the transparent layer 110 is made of translucent alumina. Such translucent alumina acts as a circuit board that connects the blue micro LEDs 115 (denoted as 115a, 115b, 115c) to their respective power sources and / or controls. Translucent alumina also provides a relatively high thermal conductivity (about 40 W / m · K compared to about 1 W / m · K of glass). By using a material having such a high thermal conductivity, the heat generated by the blue micro LED 115 is transferred laterally to the edge of the illumination forming portion 121 on which a heat sink (not shown) can be placed outside the field opening. Provide a mechanism for diverging in the direction. Furthermore, the translucency of the translucent alumina helps to enhance the uniformity of the RGB light reflected and returned by the reflection forming unit 136 by acting as a bulk diffuser. The scattering surface 105 further enhances the diffusion generated by the transparent layer 110, and such a scattering surface 105 is formed on any structure or pattern on the surface of the transparent layer 110 and / or on the surface of the transparent layer 110. It can be a material.

The blue micro LED 115 (ie, 115a, 115b, 115c) is connected to the transparent layer 110 using a conductive trace (not shown). In some cases, the conductive trace is a metal trace to which the blue micro LED 115 is soldered. In various cases, the conductive trace can be a zigzag or cedar pattern rather than a straight line to reduce artifacts and unwanted moiré patterns. The blue micro LED 115 can be any type of conventionally known blue light emitting diode. Based on the disclosure herein, one of ordinary skill in the art will appreciate a variety of blue light emitting diodes that can be used for different embodiments. The blue micro LED 115 is placed so that the light emitted from the blue micro LED 115 during operation is separated from the transparent layer 110. In some embodiments, the blue micro LED 115 is a lateral element in which contacts to both p-type and n-type materials are located on the same side of each LED element. In another embodiment, the blue microLED 115 is a vertically oriented device in which the contact with the p-type material is on one side of the device and the contact with the n-type material is on the other side of the device. In the description of the present specification, the above-mentioned vertical element is used.

When such a vertically oriented element is used, the side wall of each micro LED 115 remains open so that a contact with both the top and bottom of each element can be formed. In order to prevent short circuits between the blue micro LEDs 115, a flattening layer 120 is formed between the blue micro LEDs 115 so as to include the side surface of the blue micro LEDs 115 while leaving the uppermost portion of the blue micro LEDs exposed. .. The flattening layer 120 is made of any non-conductive transparent material suitable for forming a layer surrounding the blue micro LED 115. In some embodiments, the flattening layer 120 is made of a polymer. The transparent conductive layer 125 is formed on the flattening layer 120 so that a conductive connection is established between the transparent conductive layer 125 and each blue micro LED 115. Therefore, assuming that the blue micro LED 115 is the vertically oriented element, an electrical contact portion to one side of each blue micro LED 115 is formed by using the transparent layer 110, and each blue micro LED 115 is attached to the other side. The electrical contact portion is formed by using the transparent conductive layer 125. The transparent conductive layer 125 can be formed of any material that is substantially transparent and conductive. In some embodiments, the transparent conductive layer 125 is made of indium tin oxide (ITO).

The reflection forming unit 136 includes a reflection layer 151 arranged on the base material 135. The reflective layer 151 includes a quantum dot layer 150 arranged on the base material 135 and a metal layer 155 arranged on the quantum dot layer 150. The quantum dot layer 150 includes a large number of quantum dots that act to reflect the light emitted from the blue micro LED 115. In some cases, the size and shape of the quantum dots in the quantum dot layer 150 is such that when the blue light from the blue micro LED 115 hits each quantum dot, each quantum dot emits light in a defined frequency range. Designed. In some embodiments, when a blue ray from the blue microLED 115 hits the quantum dots of the quantum dot layer 150, it causes isotropic re-emission of red or green light.

The quantum dot layer 150 can exhibit different configurations in different embodiments, as different approaches can be used to make the color transforming element identified as the quantum dot layer 150. As an example, a large number of quantum dots can be mixed into a polymer suspension over a large sheet (eg, by spray deposition or slot die coating). The substrate 135 is then cut or separated into fragments sized to fit the size of the cloudy zone of the reflection forming section 136. Such a cloudy zone can be, for example, a 50 x 60 mm region in the case of a 65 inch (about 165 cm) display with 384 zones. Based on the disclosure herein, one of ordinary skill in the art will appreciate the size of a number of cloudy zones that can be used in relation to different embodiments.

As shown in this embodiment, the step of cutting the base material includes a step of chamfering the glass of the base material 135, and a triangular zone between each portion of the base material 135 when attached to the illumination forming portion 121. A pyramidal trapezoidal shape that produces the split portion 140 is realized. When the blue light from the blue micro LED hits the quantum dots in the quantum dot layer 150, the resulting re-emission is isotropic, but the reflector turns the light in the desired direction so that it points toward the LCD panel. This means that all light can return through the illumination forming unit 121 and leak directly. In order to prevent significant light leakage to adjacent zones that can cause unwanted crosstalk, the substrate 135 is formed in the pyramidal trapezoidal shape with a zone divider 140 between them. When light that re-emits and travels at a steep angle close to parallel to the conversion unit hits the side wall at an oblique angle of the pyramid, the light does not travel to the adjacent zone, but the illumination forming unit 121. Directed back towards. Some light leakage between adjacent zones may be desirable, so that light can be directed into the adjacent zones as it passes through the transparent layer 110, but in areas of the transparent layer 110 that are too wide. Before crossing, the scattering surface 105 promotes extraction.

In the illustrated case, the quantum dot layer 150 is formed on the base material 135, and then the base material 135 is cut. In other cases (not shown), the substrate 135 is cut before the quantum dot layer 150 is formed on the substrate 135. Such pre-cutting provides an opportunity for the quantum dot layer 150 to extend to the side wall of the substrate exposed by the cutting process (ie, the quantum dot layer 150 intervenes the substrate 135). (Separate from the zone dividing portion 140). Having a quantum dot layer 150 extending to the cut side wall of the substrate 135 may be desirable when it is expected that the substantial blue emission light from the blue microLED 115 will hit the side wall of the substrate 135. sell.

The metal layer 155 acts both as a reflective layer and for sealing the quantum dots of the quantum dot layer 150. The metal layer 155 is formed after cutting the base material 135, so that the metal layer 155 extends so as to cover the cut side wall portion of the base material 135. When the base material 135 is cut after the formation of the quantum dot layer 150, the metal layer 155 is directly formed on the side wall portion of the base material 135. Instead, when the substrate 135 is cut before the quantum dot layer 150 is formed, the metal layer 155 is placed on the quantum dot layer extending over the side wall of the substrate 135. The metal layer 155 can be made of any metal that is reflective and conducts heat. In one particular embodiment, the metal layer 155 is a sputtered aluminum layer. Since it is intended that the quantum dots of the quantum dot layer 150 are used for reflection to reflect the blue light rays emitted from the blue micro LED 115 and returned toward the illumination forming unit 121, the exposed side of the metal layer 155 is accessed. It's free. A heat sink (not shown) can be bonded to the metal layer 155 to cool the quantum dots. This cooling process can excite the quantum dots more strongly than if cooling is not possible, thus increasing the brightness.

As mentioned above, in some cases the substrate 135 is made of glass. Based on the disclosure herein, one of ordinary skill in the art will appreciate the various glass compositions that can be used as substrates for different embodiments.

In certain embodiments, the substrate 135 is, for example, from about 0.1 mm to about 2.5 mm, from about 0.3 mm to about 2 mm, from about 0.5 mm to about 1.5 mm, or from about 0.7 mm to about 1 mm. It can be formed of glass having a thickness of about 3 mm or less, including ranges, as well as all and subranges thereof. Substrate 135 includes any conventionally known material used in the display device, which is aluminosilicate, alkali-aluminosilicate, borosilicate, alkali-borosilicate, aluminosilicate, alkali-. It may contain aluminosilicate, soda lime, or other suitable glass. Commercially available glass suitable for use as a light guide plate of glass is not limited to, for example, Corning Incorporated EAGLE XG®, Rotus ™, Willow®, Iris ™, and Includes Gorilla® glass.

Some non-limiting glass compositions are about 50 mol% to about 90 mol% SiO ₂ , 0 mol% to about 20 mol% Al ₂ O ₃ , 0 mol% to about 20 mol% B. ₂ O ₃ , 0 mol% to about 20 mol% P ₂ O ₅ and 0 mol% to about 25 mol% R _x O, where R is Li, Na, K, Rb, Cs. Any one or more, x is 2, or Zn, Mg, Ca, Sr, or Ba, and x is 1. In some embodiments, R _x O-Al ₂ O ₃ > 0, 0 <R _x O-Al ₂ O ₃ <15, x = 2, and R ₂ O-Al ₂ O. ₃ <15, R ₂ O-Al ₂ O ₃ <2, x = 2, and R ₂ O-Al ₂ O _3- MgO> -15, 0 <(R _x O) -Al ₂ O ₃ ) <25, -11 <(R ₂ O-Al ₂ O ₃ ) <11, and -15 <(R ₂ O-Al ₂ O _3- MgO) <11, and / Alternatively, -1 <(R ₂ O-Al ₂ O ₃ ) <2 and -6 <(R ₂ O-Al ₂ O _3- MgO) <1. In some embodiments, the glass contains less than 1 ppm of each Co, Ni, and Cr. In some embodiments, the concentration of Fe is <about 50 ppm, <about 20 ppm, or <about 10 ppm. In other embodiments, Fe + 30Cr + 35Ni <about 60 ppm, Fe + 30Cr + 35Ni <about 40 ppm, Fe + 30Cr + 35Ni <about 20 ppm, or Fe + 30Cr + 35Ni <about 10 ppm. In other embodiments, the glass is about 60 mol% to about 80 mol% SiO ₂ , about 0.1 mol% to about 15 mol% Al ₂ O ₃ , 0 mol% to about 12 mol% B ₂ O ₃ , containing about 0.1 mol% to about 15 mol% R ₂ O, and about 0.1 mol% to about 15 mol% RO, where R is Li, Na, K, Rb, Any one or more of Cs, x is 2, or Zn, Mg, Ca, Sr, or Ba, and x is 1.

In other embodiments, the glass composition is about 65.79 mol% to about 78.17 mol% SiO ₂ , about 2.94 mol% to about 12.12 mol% Al ₂ O ₃ , about 0 mol. % To about 11.16 mol% B ₂ O ₃ , about 0 mol% to about 2.06 mol% Li ₂ O, about 3.52 mol% to about 13.25 mol% Na ₂ O, about 0 _K from the molar% to about 4.83 mol% 2 O, ZnO about 0 mole% to about 3.01 mol%, MgO from about 0 mole% to about 8.72 mol%, from about 0 mole% to about 4. 24 mol% CaO, about 0 mol% to about 6.17 mol% SrO, about 0 mol% to about 4.3 mol% BaO, and about 0.07 mol% to about 0.11 mol% SnO ₂ may be included.

In a further embodiment, the substrate 135 may comprise a glass having a ratio of R _x O / Al ₂ O ₃ from 0.95 to 3.23, where R is Li, Na, K, Any one or more of Rb and Cs, where x is 2. In a further embodiment, the glass may contain a ratio of R _x O / Al ₂ O ₃ from 1.18 to 5.68, where R is Li, Na, K, Rb, and Cs. Any one or more, x is 2, or R is Zn, Mg, Ca, Sr, or Ba, and x is 1. In a further embodiment, the glass may contain R _x O-Al ₂ O ₃ -MgO of -4.25 to 4.0, where R is Li, Na, K, Rb, and Cs. Is any one or more of, and x is 2. In a further embodiment, the glass is about 66 mol% to about 78 mol% SiO ₂ , about 4 mol% to about 11 mol% Al ₂ O ₃ , and about 4 mol% to about 11 mol% B ₂ O. _3. About 0 mol% to about 2 mol% Li ₂ O, about 4 mol% to about 12 mol% Na ₂ O, about 0 mol% to about 2 mol% K ₂ O, about 0 mol% to about 0 mol% 2 mol% ZnO, about 0 mol% to about 5 mol% MgO, about 0 mol% to about 2 mol% CaO, about 0 mol% to about 5 mol% SrO, about 0 mol% to about 2 mol It may contain% BaO and about 0 mol% to about 2 mol% SnO ₂ .

In a further embodiment, the glass substrate is about 72 mol% to about 80 mol% SiO ₂ , about 3 mol% to about 7 mol% Al ₂ O ₃ , about 0 mol% to about 2 mol% B. ₂ O ₃ , about 0 mol% to about 2 mol% Li ₂ O, about 6 mol% to about 15 mol% Na ₂ O, about 0 mol% to about 2 mol% K ₂ O, about 0 mol% From about 2 mol% ZnO, about 2 mol% to about 10 mol% MgO, about 0 mol% to about 2 mol% CaO, about 0 mol% to about 2 mol% SrO, about 0 mol% to about It may include a glass material containing 2 mol% BaO and about 0 mol% to about 2 mol% SnO ₂ . In certain embodiments, the glass is about 60 mol% to about 80 mol% SiO ₂ , about 0 mol% to about 15 mol% Al ₂ O ₃ , and about 0 mol% to about 15 mol% B ₂ O _3. , And may contain from about 2 mol% to about 50 mol% R _x O, where R is any one or more of Li, Na, K, Rb, and Cs, where x is 2. Or R is Zn, Mg, Ca, Sr, or Ba, x is 1, and Fe + 30Cr + 35Ni <about 60 ppm.

In some embodiments, the substrate 135 is less than 0.05 (eg, about -0), such as in the range of about -0.005 to about 0.05, or about 0.005 to about 0.015. .005, -0.004, -0.003, -0.002, -0.001, 0, 0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0 .007, 0.008, 0.009, 0.010, 0.011, 0.012, 0.013, 0.014, 0.015, 0.02, 0.03, 0.04, or 0 It may include the color shift Δ of 0.05). In other embodiments, the glass substrate may contain less than 0.008 color shifts. According to certain embodiments, the glass substrate is less than about 3 dB / m, less than about 2 dB / m, less than about 1 dB / m, less than about 0.5 dB / m, less than about 0.2 dB / m, or even lower. It can have a light attenuation α ₁ such as a value less than about 4 dB / m (eg, due to absorption and / or scattering loss), eg, from about 0.2 dB / m for a wavelength range of about 420-750 nm. It can be in the range of 4 dB / m.

Attenuation is specified by measuring the light transmittance _TL (λ) through which the incident light from the light source passes through a transparent substrate of length L and normalizing this transmittance with the light source spectrum T ₀ (λ). sell. Attenuation is obtained in units of dB / m by α (λ) = -10 / L × log ₁₀ ( _TL (λ) / T _L (λ)), where L is the length in meters. _TL (λ) and _TL (λ) are measured in units of radiation.

Substrate 135 may include, in some embodiments, chemically strengthened glass, for example by ion exchange. During the ion exchange process, ions in the glass sheet on or near the surface of the glass sheet can be exchanged, for example, with larger metal ions from a salt bath. By incorporating larger ions into the glass, the sheet can be strengthened by creating compressive stresses in the region near the surface. Corresponding tensile stresses can occur within the central region of the glass sheet and balance the compressive stresses.

Ion exchange can be performed, for example, by immersing the glass in a molten salt bath for a predetermined time. An exemplary salt bath may include, but is not limited to, KNO ₃ , LiNO ₃ , NaNO ₃ , RbNO ₃ , and combinations thereof. The temperature and treatment time of the molten salt bath can vary. It is within the ability of one of ordinary skill in the art to determine the time and temperature according to the desired use case. As a non-limiting example, the temperature of the molten salt bath is in the range of about 400 ° C. to about 800 ° C., such as about 400 ° C. to about 500 ° C., and the predetermined time is about 4 hours to about 10 hours, etc. It can be from about 4 to about 24 hours, but other combinations of temperature and time are also intended. As a non-limiting example, glass can be immersed in a KNO ₃ bath, for example, at about 450 ° C. for about 6 hours to obtain a K-added layer that imparts surface compressive stress.

The reflection forming portion 136 is attached to the illumination forming portion 121 by using an optically transparent adhesive 130 between the surface of the base material 135 and the transparent conductive layer 125. The optically transparent adhesive 130 can be made of any adhesive material capable of attaching and holding the reflection forming portion 136 to the illumination forming portion 121. In some embodiments, the optically transparent adhesive 130 is a UV-curable acrylic liquid.

With reference to FIGS. 1b-1i, various processing steps according to several embodiments that can be used alone or in combination to produce a backlight similar to the micro LED backlight 100 are shown. The reflection forming section 136 is manufactured using the treatments of FIGS. 1b to 1d, and the illumination forming section 121 is manufactured using the processing of FIGS. 1e to 1i.

With reference to FIG. 1b, FIG. 160 shows the base material 135 before cutting to form the intervening zone division 140. The quantum dot layer 150 is formed on the surface of the base material 135 by using an arbitrary treatment known conventionally for forming the quantum dot layer. Referring to FIG. 1c, the glass material of the substrate 135 is chamfered to generate an inverted pyramid shape at the intervening zone division 140. Referring to FIG. 1d, a metal or other thermally conductive material is deposited over the remaining portion of the quantum dot layer 150 and the exposed sides by cutting the substrate 135.

Referring to FIG. 1e, a transparent layer 110 is provided and conductive traces (not shown) are formed on the surface of the transparent layer 110. With reference to FIG. 1f, the blue micro LED 115 is attached to the transparent layer 110, for example by soldering to a conductive trace. With reference to FIG. 1g, a flattening layer 120 is formed between the blue micro LEDs 115 to leave the surface of each micro LED 115 exposed. Referring to FIG. 1h, the transparent conductive layer 125 is formed on the flattened layer 120. With reference to FIG. 1i, the scattering surface 105 is formed in and / or on the surface of the transparent layer 110. At this point, the reflection forming portion 136 is joined to the illumination forming portion 121 using a transparent adhesive to manufacture the micro LED backlight 100.

With reference to FIG. 1j, a display device 190 including a micro LED backlight 100 according to one or more embodiments is shown. As shown, the micro LED backlight 100 is shown by the components red, green, and blue rays 160 (ie, 160a, 160b, 160c, 160d, 160e, 160f, 160g, 160h, 160i, 160j lines). A ray) is directed at the liquid crystal display (LCD) panel 180, and each ray emits one of a red, green, or blue ray, depending on which type of quantum dot reflects the light on the quantum dot layer 150. Represent. The liquid crystal display panel 180 may be any conventionally known device capable of selectively transmitting and / or color filtering the light received at each pixel position. Based on the disclosure herein, one of ordinary skill in the art will appreciate various LCD panels that can be used for different embodiments.

As shown, by applying power to the micro LED backlight 100, the blue micro LED 115 reflects the blue light rays (shown by lines 165a, 165b, 165c, 166a, 166b, 166c, 167a, 167b, 167c). It is made to emit toward 136, where the blue ray is reflected from the quantum dots of the quantum dot layer 150. Depending on which type of quantum dot reflects the blue ray on the quantum dot layer 150, it reflects the red or green ray 160, or the blue ray scatters without color conversion. The continuous blue rays reflected from the quantum dot layer 150 containing a large number of red, green, and blue quantum dots emit the continuous red, green, and blue rays 160 that are reflected back toward the illumination forming unit 121. Occurs. The red, green, and blue rays 160 pass through the various transparent layers of the illumination forming unit 121 and enter the LCD panel 180. The diffusivity of the transparent layer 110 and other layers greatly reduces shading from the blue microLED 115 and other non-transparent elements in the propagation path of the red, green, and blue rays 160, resulting in red. , Green, and blue component lights are distributed substantially uniformly over the surface of the LCD panel 180. The LCD panel 180 can then act as previously known to allow light of the selected color to pass through the display at various pixel positions.

Referring to FIG. 2a, other micro LED backlights 200 according to various embodiments are shown. Compared with the micro LED backlight 100 described with reference to FIGS. 1a to 1b, the micro LED backlight 200 is formed without including the zone dividing portion. The micro LED backlight 200 includes an illumination forming unit 221 and a reflection forming unit 236.

The illumination forming unit 221 includes a scattering surface 205 arranged on the transparent layer 210. In some embodiments, the transparent layer 210 is made of translucent alumina. Such translucent alumina acts as a circuit board that connects the blue micro LEDs 215 (denoted as 215a, 215b, 215c) to their respective power sources and / or controls. Translucent alumina also provides a relatively high thermal conductivity (about 40 W / m · K compared to about 1 W / m · K of glass). By using a material having such a high thermal conductivity, the heat generated by the blue micro LED 215 is transferred laterally to the edge of the illumination forming portion 221 on which a heat sink (not shown) can be placed outside the field opening. Provide a mechanism for diverging in the direction. Further, the translucency of the translucent alumina helps to enhance the uniformity of the RGB light reflected and returned from the reflection forming portion 236 by acting with the bulk diffusing portion. The scattering surface 205 further enhances the diffusion generated by the transparent layer 210, and thus the scattering surface 205 is any structure or pattern on the surface of the transparent layer 210 and / or is formed on the surface of the transparent layer 210. It can be a material that has been made.

The blue micro LED 215 (ie, 215a, 215b, 215c) is connected to the transparent layer 210 using a conductive trace (not shown). In some cases, the conductive trace is a metal trace to which the blue micro LED 215 is soldered. In various cases, the conductive traces are not straight, but rather can be zigzag or cedar pattern to reduce artifacts and unwanted moiré patterns. The blue micro LED 215 can be any type of conventionally known blue light emitting diode. Based on the disclosure herein, one of ordinary skill in the art will appreciate a variety of blue light emitting diodes that can be used for different embodiments. The blue micro LED 215 is placed so that the light emitted from the blue micro LED 215 during operation is separated from the transparent layer 210. In some embodiments, the blue micro LED 215 is a sideways element in which contacts to both p-type and n-type materials are located on the same side of each LED element. In another embodiment, the blue microLED 215 is a vertically oriented device in which the contact with the p-type material is on one side of the device and the contact with the n-type material is on the other side of the device. In the description of the present specification, the above-mentioned vertical element is used.

When such a vertically oriented element is used, the side wall of each micro LED 215 remains open so that contact with both the top and bottom of each element can be formed. In order to prevent short circuits between the blue micro LEDs 215, a flattening layer 220 is formed between the blue micro LEDs 215 so as to include the side surface of the blue micro LEDs 215 while leaving the uppermost portion of the blue micro LEDs 215 exposed. .. The flattening layer 220 is made of any non-conductive transparent material suitable for forming a layer surrounding the blue micro LED 215. In some embodiments, the flattening layer 220 is made of a polymer. The transparent conductive layer 225 is formed on the flattening layer 220 so that a conductive connection is established between the transparent conductive layer 225 and each blue micro LED 215. Therefore, assuming that the blue micro LED 215 is the vertically oriented element, an electrical contact portion to one side of each blue micro LED 215 is formed by using the transparent layer 210, and each blue micro LED 215 is connected to the other side. The electrical contact portion is formed by using the transparent conductive layer 225. The transparent conductive layer 225 can be formed of any material that is substantially transparent and conductive. In some embodiments, the transparent conductive layer 225 is made of indium tin oxide (ITO).

The reflection forming unit 236 includes a reflection layer 251 arranged on the base material 235. The reflective layer 251 includes a quantum dot layer 250 arranged on the base material 235 and a metal layer 255 arranged on the quantum dot layer 250. The quantum dot layer 250 includes a large number of quantum dots that act to reflect the light emitted from the blue micro LED 215. In some cases, the size and shape of the quantum dots in the quantum dot layer 250 is such that when the blue light from the blue micro LED 215 hits each quantum dot, each quantum dot emits light in a defined frequency range. Designed. In some embodiments, when a blue ray from the blue microLED 215 hits the quantum dots of the quantum dot layer 250, it causes isotropic re-emission of red, green, or blue light. It should be noted that quantum dots do not convert blue light. Rather, scattered particles such as TiO ₂ are contained in the polymer in which the quantum dots are suspended. A part of the incident blue light is scattered by the quantum dots without color conversion. In this way, RGB is generated.

The quantum dot layer 250 can exhibit different configurations in different embodiments, as different approaches can be used to make the color transforming element identified as the quantum dot layer 250. As an example, a large number of quantum dots can be mixed into a polymer suspension over a large sheet (eg, by spray deposition or slot die coating). In the present embodiment, the base material 235 is not cut or separated into fragments sized to fit the size of the cloudy zone of the reflection forming portion 236, but rather, since the base material 235 is flat, the lower surface is coated and clouded. Generate a zone. Such a cloudy zone can be, for example, a 50 x 60 mm region in the case of a 65 inch (about 165 cm) display with 384 zones. Based on the disclosure herein, one of ordinary skill in the art will appreciate the size of a number of cloudy zones that can be used in relation to different embodiments. If it is expected that the substantial blue light emitted from the blue micro LED 215 will hit the side wall of the substrate 235, it may be desirable to extend the quantum dot layer 250 to the cut sidewall of the substrate layer 235. .. As another example, by coating the metal layer (ie, layer 255) with quantum dots, and then sealing the quantum dots on the metal layer with sputtered glass, oxide or other thin film. , The quantum dot layer 250 can be formed to form a color conversion element. Next, the combination of the quantum dot layer 250 and the metal layer 255 can be bonded to the base material 235 using a transparent adhesive. As yet another example, the quantum dots are first deposited on the underside of the substrate 235, then the quantum dots are sealed by sputtering a metal on the same underside of the substrate 235. A combination of the quantum dot layer 250 and the metal layer 255 is generated. Such a process does not require the joining process as described above.

The metal layer 255 can be made of any metal that is reflective and capable of transferring heat. In one particular embodiment, the metal layer 255 is a sputtered aluminum layer. Since it is intended that the quantum dots of the quantum dot layer 250 are used for reflection and the blue light rays emitted from the blue micro LED 215 are reflected back toward the illumination forming unit 221, the exposed side of the metal layer 255 is accessed. It's free. A heat sink (not shown) can be bonded to the metal layer 255 to cool the quantum dots. This cooling process can excite the quantum dots more strongly than if cooling is not possible, thus increasing the brightness.

In some embodiments, the substrate 235 is made of glass. Based on the disclosure herein, one of ordinary skill in the art will appreciate a variety of glass compositions that can be used as substrates for different embodiments. Some examples of such glass compositions are described with respect to FIG. 1a. The reflection forming portion 236 is attached to the illumination forming portion 221 by using an optically transparent adhesive 230 between the surface of the base material 235 and the transparent conductive layer 225. The optically transparent adhesive 230 can be made of any adhesive material capable of attaching and holding the reflection forming portion 236 to the illumination forming portion 221. In some embodiments, the optically transparent adhesive 230 is a UV-curable acrylic liquid.

With reference to FIG. 2b, a display device 290 including a micro LED backlight 200 according to one or more embodiments is shown. As shown, the micro LED backlight 200 is shown by the components red, green, and blue rays 260 (ie, 260a, 260b, 260c, 260d, 260e, 260f, 260g, 260h, 260i, 260j lines. A ray) is directed at the liquid crystal display (LCD) panel 280, and each ray emits one of a red, green, or blue ray, depending on which type of quantum dot reflects the light on the quantum dot layer 250. Represent. The liquid crystal display panel 280 can be any conventionally known device capable of selectively transmitting and / or color filtering the light received at each pixel position. Based on the disclosure herein, one of ordinary skill in the art will appreciate various LCD panels that can be used for different embodiments.

As shown, by applying power to the micro LED backlight 200, the blue micro LED 215 reflects the blue light rays (shown by lines 265a, 265b, 265c, 266a, 266b, 266c, 267a, 267b, 267c). It is directed towards 236, where the blue light is reflected from the quantum dots in the quantum dot layer 250. Depending on which type of quantum dot reflects the blue ray on the quantum dot layer 250, it reflects a red ray, a green ray, or a blue ray 260. The continuous blue rays reflected from the quantum dot layer 250 containing a large number of red, green, and blue quantum dots emit the continuous red, green, and blue rays 260 that are reflected back toward the illumination forming unit 221. Occurs. The red, green, and blue rays 260 pass through the various transparent layers of the illumination forming unit 221 and enter the LCD panel 280. The diffusivity of the transparent layer 210 and other layers greatly reduces shading from the blue microLED 215 and other non-transparent elements in the propagation path of the red, green, and blue rays 260, resulting in red. , Green, and blue component lights are distributed substantially uniformly over the surface of the LCD panel 280. Next, the LCD panel 280 can act as conventionally known to allow light of the selected color to pass through the display at various pixel positions.

Referring to FIG. 3a, yet another micro LED backlight 300 according to various embodiments is shown, which is a blue micro LED 315, red and green quantum dots incorporated in a quantum dot layer 350, and a volume diffuser 305. including. The micro LED backlight 300 includes an illumination forming unit 321 and a reflection forming unit 336 that are mechanically separated by a gap 320. The gap 320 can be filled with any gas that can transmit light, or a mixture thereof.

The illumination forming unit 321 includes a volume diffusing unit 305 arranged on the transparent layer 310. In some embodiments, the transparent layer 310 is made of translucent alumina. In other embodiments, the transparent layer is made of glass. When translucent alumina is used, the translucent alumina acts as a circuit board that connects the blue micro LEDs 315 (denoted as 315a, 315b, 315c) to their respective power supplies and / or control units. Translucent alumina also provides a relatively high thermal conductivity (about 40 W / m · K compared to about 1 W / m · K of glass). By using a material having such a high thermal conductivity, the heat generated by the blue micro LED 315 is laterally transferred to the edge of the illumination forming portion 321 where the heat sink (not shown) can be placed outside the field opening. Provide a mechanism for diverging in the direction. It should be noted that the translucency of the translucent alumina helps to enhance the uniformity of the RGB light reflected and returned by the reflection forming unit 336 by acting as a bulk diffusing part, but in this embodiment. Then, since the volume diffusion unit 305 performs the diffusion function, such a bulk diffusion unit is not required. The volume diffusing unit 305 can be formed of any translucent material that diffuses the light transmitted through it. In some embodiments, the volume diffusing section 305 is made of a polymer having fine inclusions that scatter light, such as PMMA or polycarbonate. In some cases, inclusions are zirconia, alumina, and / or titanium. Based on the disclosure herein, one of ordinary skill in the art will appreciate the various volume diffusers and materials that can be used for different embodiments.

The blue micro LED 315 (ie, 315a, 315b, 315c) is connected to the transparent layer 310 using a conductive trace (not shown). In some cases, the conductive trace is a metal trace to which the blue micro LED 315 is soldered. In various cases, the conductive trace can be a zigzag or cedar pattern rather than a straight line to reduce artifacts and unwanted moiré patterns. The blue micro LED 315 can be any type of conventionally known blue light emitting diode. Based on the disclosure herein, one of ordinary skill in the art will appreciate a variety of blue light emitting diodes that can be used for different embodiments. The blue micro LED 315 is placed so that the light emitted from the blue micro LED 315 during operation is separated from the transparent layer 310. In some embodiments, the blue micro LED 315 is a sideways element in which contacts to both p-type and n-type materials are located on the same side of each LED element. In another embodiment, the blue microLED 315 is a vertical element with a contact with the p-type material on one side of the device and a contact with the n-type material on the other side of the element. In either case, the blue micro LED 315 is electrically connected to both the p-type and n-type materials.

The reflection forming unit 336 includes a reflection layer 351 arranged on the base material 335. The reflective layer 351 includes a quantum dot layer 350 arranged on the base material 335 and a metal layer 355 arranged on the quantum dot layer 350. The quantum dot layer 350 includes a large number of quantum dots that act to reflect the light emitted from the blue micro LED 315. In some cases, the size and shape of the quantum dots in the quantum dot layer 350 is such that when the blue light from the blue micro LED 315 hits each quantum dot, each quantum dot emits light in a defined frequency range. Designed. In some embodiments, when a blue ray from the blue microLED 315 hits the quantum dots of the quantum dot layer 350, it causes isotropic re-emission of red, green, or blue light.

Since various approaches can be used to make the color transforming element identified as the quantum dot layer 350, the quantum dot layer 350 may exhibit different configurations in different embodiments. As an example, a large number of quantum dots can be mixed into a polymer suspension over a large sheet (eg, by spray deposition or slot die coating). In some cases, the underside of the substrate 335 is coated with quantum dots, and then the quantum dots are sealed by sputtering a metal onto the underside of the substrate 335 to seal the quantum dots. A combination of the metal layer 355 and the quantum dot layer 350 is manufactured. In addition to sealing the quantum dots, the metal layer 355 acts as a reflective layer. The metal layer 355 can be made of any metal that is reflective and capable of transferring heat. In one particular embodiment, the metal layer 355 is a sputtered aluminum layer. Since the quantum dots of the quantum dot layer 350 are used for reflection and the blue light rays emitted from the blue micro LED 315 are intended to be reflected back toward the illumination forming unit 321, the exposed side of the metal layer 355 is accessed. It's free. A heat sink (not shown) can be bonded to the metal layer 355 to cool the quantum dots. This cooling process can excite the quantum dots more strongly than if cooling is not possible, thus increasing the brightness.

In some embodiments, the substrate 335 is made of glass. Based on the disclosure herein, one of ordinary skill in the art will appreciate a variety of glass compositions that can be used as substrates for different embodiments. Some examples of such glass compositions are described with respect to FIG. 1a. Again, the reflection forming section 336 is mechanically separated from the illumination forming section 321 at a predetermined distance. Such physical separation between the reflection forming portion 336 and the illumination forming portion 321 is generated by using a structural element (not shown) near the edge of the micro LED backlight 300 so as to be outside the visual field opening. Can be done.

With reference to FIG. 3b, a display device 390 including the micro LED backlight 300 according to one or more embodiments is shown. As shown, the micro LED backlight 300 is shown by the components red, green, and blue rays 360 (ie, 360a, 360b, 360c, 360d, 360e, 360f, 360g, 360h, 360i, 360j lines. A ray) is directed at the liquid crystal display (LCD) panel 380, and each ray emits one of a red, green, or blue ray, depending on which type of quantum dot reflects the light on the quantum dot layer 350. Represent. When a blue micro LED is used, the quantum dot layer 350 may have both red and green quantum dots, as well as scattered particles. The re-emitted (or scattered) wavelength can depend on what the incident blue light hits. The liquid crystal display panel 380 can be any conventionally known device capable of selectively transmitting and / or color filtering the light received at each pixel position. Based on the disclosure herein, one of ordinary skill in the art will appreciate various LCD panels that can be used for different embodiments.

As shown, by applying power to the micro LED backlight 300, the blue micro LED 315 reflects the blue light rays (shown by lines 365a, 365b, 365c, 366a, 366b, 366c, 376a, 376b, 376c). It is directed towards 336, where the blue light is reflected from the quantum dots in the quantum dot layer 350. Depending on which type of quantum dot reflects the blue ray at the quantum dot layer 350, it reflects the red, green, or blue ray 360. The continuous blue rays reflected from the quantum dot layer 350 containing a large number of red, green, and blue quantum dots emit the continuous red, green, and blue rays 360 that are reflected and returned toward the illumination forming unit 321. Occurs. The red, green, and blue rays 360 pass through the various transparent layers of the illumination forming unit 321 and enter the LCD panel 380. The diffusivity of the volume diffusing section 305 greatly reduces shading from the blue microLED 315 and other non-transparent elements in the propagation path of the red, green, and blue rays 360, red, green, red, green, In addition, the blue component light is distributed substantially uniformly over the surface of the LCD panel 380. The LCD panel 380 can then act as previously known to allow light of the selected color to pass through the display at various pixel positions.

With reference to FIG. 4a, another micro LED backlight 400 is shown, which is the same as the micro LED backlight 300 of FIGS. 3a to 3b, but in the micro LED backlight 400, the quantum dots of the micro LED backlight 300 are shown. Quantum dot enhancement film (QDEF) 435 is used instead of layer 350 and substrate 335. The micro LED backlight 400 includes the illumination forming section 321 and the reflection forming section 436 that are mechanically separated by the gap 420. The gap 420 can be filled with any gas that can transmit light, or a mixture thereof.

The reflection forming section 436 includes a metal layer 455 arranged on the QDEF 435. As an example, QDEF435 is a QDEF commercially available from 3M ™, described in "3M Quantum Dot Emphasizing Film (QDEF)" (date unknown) by John Van Derlovsek et al., Ttp: // multimedia. 3m. com / mws / media / 985375O / 3mtm-quantum-dot-enhancement-film-qdef-white-paper. It is available in pdf. The above references are incorporated herein by reference in their entirety for all purposes. It should be noted that other materials with similar physical properties to the 3M product can be used.

In one particular embodiment, the metal layer 455 is a sputtered aluminum layer. Since the QDEF 435 is used to reflect the blue light emitted from the blue micro LED 315 and return it towards the illumination forming unit 321 so that the exposed side of the metal layer 455 is accessible. A heat sink (not shown) can be bonded to the metal layer 455 to cool the quantum dots. This cooling process can excite the quantum dots more strongly than if cooling is not possible, thus increasing the brightness. Similar to that described for FIG. 3a, the reflection forming section 436 is mechanically separated from the illumination forming section 321 at a predetermined distance. Such physical separation between the reflection forming portion 436 and the illumination forming portion 321 is generated by using a structural element (not shown) near the edge of the micro LED backlight 400 so as to be outside the visual field opening. Can be done.

Referring to FIG. 4b, a display device 490 including a micro LED backlight 400 according to one or more embodiments is shown. As shown, the micro LED backlight 400 is shown by the components red, green, and blue rays 460 (ie, 460a, 460b, 460c, 460d, 460e, 460f, 460g, 460h, 460i, 460j lines. A ray) is directed at the liquid crystal display (LCD) panel 480, and each ray emits one of a red, green, or blue ray, depending on which type of quantum dot reflects the light at the quantum dot layer 450. Represent. The liquid crystal display panel 480 can be any conventionally known device capable of selectively transmitting and / or color filtering the light received at each pixel position. Based on the disclosure herein, one of ordinary skill in the art will appreciate various LCD panels that can be used for different embodiments.

As shown, by applying power to the micro LED backlight 400, the blue micro LED 415 reflects the blue light rays (shown by lines 465a, 465b, 465c, 466a, 466b, 466c, 467a, 467b, 467c). It is directed towards 436, where the blue light is reflected from the quantum dots in the quantum dot layer 450. It reflects red, green, or blue rays 460, depending on which type of quantum dots reflected the blue rays at the quantum dot layer 450. The continuous blue rays reflected from the quantum dot layer 450 containing a large number of red, green, and blue quantum dots emit the continuous red, green, and blue rays 460 that are reflected back toward the illumination forming unit 421. Occurs. The red, green, and blue rays 460 pass through the various transparent layers of the illumination forming unit 321 and enter the LCD panel 480. The diffusivity of the volume diffusing section 305 greatly reduces shading from the blue microLED 315 and other non-transparent elements in the propagation path of the red, green, and blue rays 460, red, green, red, green, In addition, the blue component light is distributed substantially uniformly over the surface of the LCD panel 480. Next, the LCD panel 480 can act as conventionally known to allow light of the selected color to pass through the display at various pixel positions.

Referring to FIG. 5a, yet another micro LED backlight 500 using a phosphor-converted white micro LED 515 (denoted as 515a, 515b, 515c) according to another embodiment is shown. The micro LED backlight 500 includes an illumination forming unit 521 and a reflective layer 555. The reflective layer can be made of any material that can reflect the light emitted by the phosphor-converted white microLED 515. Further, in those embodiments, if the reflective layer 555 is a self-supporting layer without the use of other structural supports, the material forming the reflective layer 555 should be strong enough to be self-supporting. Is. In some embodiments, the reflective layer 555 is made of metal. In one particular embodiment, the reflective layer 555 is made of aluminum. The illumination forming portion 521 and the reflection layer 555 are mechanically separated by a gap 520. The gap 520 can be filled with any gas that can transmit light, or a mixture thereof.

The illumination forming unit 521 includes a volume diffusing unit 505 arranged on the transparent layer 510. In some embodiments, the transparent layer 510 is made of translucent alumina. In other embodiments, the transparent layer is made of glass. When translucent alumina is used, the translucent alumina acts as a circuit board that connects the phosphor-converted white microLED 515 to each power source and / or control unit. Translucent alumina also provides a relatively high thermal conductivity (about 40 W / m · K compared to about 1 W / m · K of glass). By using a material having such a high thermal conductivity, the heat generated by the white micro LED 515 is transferred laterally to the edge of the illumination forming portion 521 where the heat sink (not shown) can be placed outside the field opening. Provide a mechanism for diverging in the direction. It should be noted that the translucency of the translucent alumina helps to enhance the uniformity of the RGB light reflected and returned by the reflection forming part 536 by acting as a bulk diffusing part, although this embodiment Then, since the volume diffusion unit 505 performs the diffusion function, such a bulk diffusion unit is not required. The volume diffusing unit 505 can be formed of any translucent material that diffuses the light that passes through it. In some embodiments, the volume diffusing section 505 is made of a polymer having fine inclusions that scatter light, such as PMMA or polycarbonate. In some cases, inclusions are zirconia, alumina, and / or titanium. Based on the disclosure herein, one of ordinary skill in the art will appreciate the various volume diffusers and materials that can be used for different embodiments.

The phosphor-converted white microLED 515 (ie, 515a, 515b, 515c) is connected to the transparent layer 510 using a conductive trace (not shown). In some cases, the conductive trace is a metal trace to which the phosphor-converted white micro LED 515 is soldered. In various cases, the conductive trace can be a zigzag or cedar pattern rather than a straight line to reduce artifacts and unwanted moiré patterns. The phosphor-converted white micro LED 515 can be any type of conventionally known white light emitting diode. Based on the disclosure herein, one of ordinary skill in the art will appreciate a variety of white light emitting diodes that can be used for different embodiments. The phosphor-converted white micro LED 515 is placed so that the light emitted from the white micro LED 515 during operation is separated from the transparent layer 510. In some embodiments, the fluorophore-converted white micro LED 515 is a lateral element in which contacts to both the p-type and n-type materials are located on the same side of each LED element. In another embodiment, the white microLED 515 is a vertically oriented device in which the contact with the p-type material is on one side of the device and the contact with the n-type material is on the other side of the device. In either case, the phosphor-converted white micro LED 515 is electrically connected to both the p-type material and the n-type material.

Similar to that described for FIG. 5a, the reflective layer 555 is mechanically separated from the illumination forming unit 521 at a predetermined distance. Such physical separation of the reflective layer 555 and the illumination forming unit 521 is generated by using a structural element (not shown) near the edge of the micro LED backlight 500 so as to be outside the visual field opening. sell.

Referring to FIG. 5b, a display device 590 including a micro LED backlight 500 according to one or more embodiments is shown. As shown in the figure, the micro LED backlight 500 is a white light ray 560 reflected by the reflection layer 555 (that is, a light ray shown by 560a, 560b, 560c, 560d, 560e, 560f, 560g, 560h, 560i, 560j). To the liquid crystal display (LCD) panel 580. The liquid crystal display panel 580 can be any conventionally known device capable of selectively transmitting and / or color filtering the light received at each pixel position. Based on the disclosure herein, one of ordinary skill in the art will appreciate various LCD panels that can be used for different embodiments.

As shown, the micro LED backlight 500 is powered by the phosphor-converted white micro LED 515 to emit white light (shown by lines 565a, 565b, 565c, 566a, 566b, 566c, 567a, 567b, 567c). It is directed towards the reflective layer 555, where the white light is reflected towards the illumination forming section 521. The white light 560 passes through various transparent layers of the illumination forming unit 521 and enters the LCD panel 580. Due to the diffusivity of the volume diffusing unit 505, the shadow from the phosphor-converted white micro LED 515 and other non-transparent elements in the propagation path of the white light 560 is greatly reduced, and the light is emitted from the LCD panel 580. It is distributed almost uniformly over the surface. The LCD panel 580 can then act as previously known to allow light of the selected color to pass through the display at various pixel positions.

Reference to FIG. 6a shows yet another micro LED backlight 600 using RGB micro LED 615s (denoted as 615a, 615b, 615c) according to yet another embodiment. The micro LED backlight 600 includes an illumination forming unit 621 and a reflective layer 655. The reflective layer can be made of any material that can reflect the light emitted by the RGB microLED 615. Further, in those embodiments, if the reflective layer 655 is a self-supporting layer without the use of other structural supports, the material forming the reflective layer 655 should be strong enough to be self-supporting. Is. In some embodiments, the reflective layer 655 is made of metal. In one particular embodiment, the reflective layer 655 is made of aluminum. The illumination forming portion 621 and the reflective layer 655 are mechanically separated by a gap 620. The gap 620 can be filled with any gas that can transmit light, or a mixture thereof.

The illumination forming unit 621 includes a volume diffusing unit 605 arranged on the transparent layer 610. In some embodiments, the transparent layer 610 is made of translucent alumina. In other embodiments, the transparent layer is made of glass. When translucent alumina is used, the translucent alumina acts as a circuit board that connects the RGB microLED 615 to each power source and / or control unit. Translucent alumina also provides a relatively high thermal conductivity (about 40 W / m · K compared to about 1 W / m · K of glass). By using a material having such a high thermal conductivity, the heat generated by the RGB micro LED 615 is transferred laterally to the edge of the illumination forming portion 621 where the heat sink (not shown) can be placed outside the field opening. Provide a mechanism for diverging in the direction. It should be noted that the translucency of the translucent alumina helps to enhance the uniformity of the RGB light reflected and returned by the reflection forming part 636 by acting as a bulk diffusing part, but in this embodiment. Then, since the volume diffusion unit 605 performs the diffusion function, such a bulk diffusion unit is not required. The volume diffusing section 605 can be formed of any translucent material that diffuses the light that passes through it. In some embodiments, the volume diffuser 605 is made of a polymer having fine inclusions that scatter light, such as PMMA or polycarbonate. In some cases, inclusions are zirconia, alumina, and / or titanium. Based on the disclosure herein, one of ordinary skill in the art will appreciate the various volume diffusers and materials that can be used for different embodiments.

The RGB micro LEDs 615 (ie, 615a, 615b, 615c) are connected to the transparent layer 610 using conductive traces (not shown). In some cases, the conductive trace is a metal trace to which the RGB micro LED 615 is soldered. In various cases, the conductive trace can be a zigzag or cedar pattern rather than a straight line to reduce artifacts and unwanted moiré patterns. The RGB micro LED 615 can be any conventionally known RGB light emitting diode. Based on the disclosure herein, one of ordinary skill in the art will appreciate a variety of RGB light emitting diodes that can be used for different embodiments. The RGB micro LED 615 is placed so that the light emitted from the RGB micro LED 615 is separated from the transparent layer 610 during operation. In some embodiments, the RGB microLED 615 is a lateral element in which contacts to both p-type and n-type materials are located on the same side of each LED element. In another embodiment, the RGB microLED 615 is a vertically oriented device in which the contact with the p-type material is on one side of the device and the contact with the n-type material is on the other side of the device. In either case, the RGB micro LED 615 is electrically connected to both the p-type and n-type materials.

Similar to that described for FIG. 6a, the reflective layer 655 is mechanically separated from the illumination forming unit 621 at a predetermined distance. Such physical separation between the reflective layer 655 and the illumination forming unit 621 is generated by using a structural element (not shown) near the edge of the micro LED backlight 600 so as to be outside the visual field opening. sell.

With reference to FIG. 6b, a display device 690 including the micro LED backlight 600 according to one or more embodiments is shown. As illustrated, the micro LED backlight 600 has red, green, and blue light rays 660 (ie, 660a, 660b, 660c, 660d, 660e, 660f, 660g, 660h, which are components reflected from the reflective layer 655. The light rays shown by the 660i and 660j lines) are directed toward the liquid crystal display (LCD) panel 680. The liquid crystal display panel 680 can be any conventionally known device capable of selectively transmitting and / or color filtering the light received at each pixel position. Based on the disclosure herein, one of ordinary skill in the art will appreciate various LCD panels that can be used for different embodiments.

As illustrated, powering the micro LED backlight 600 causes the RGB micro LED 615 to be red, green, or red (shown by lines 665a, 665b, 665c, 666a, 666b, 666c, 667a, 667b, 667c). The blue light is emitted toward the reflection layer 655, where the component red, green, or blue light is reflected back toward the illumination forming unit 621. The components red, green, and blue rays 660 pass through the various transparent layers of the illumination forming unit 621 and enter the LCD panel 680. The diffusivity of the volume diffuser 605 greatly reduces shadows from the RGB microLED 615 and other non-transparent elements in the propagation path of the red, green, or blue rays 660, allowing the light to flow through the LCD panel. It is distributed substantially uniformly over the surface of 680. The LCD panel 680 can then act as previously known to allow light of the selected color to pass through the display at various pixel positions.

Referring to FIG. 7a, another micro LED backlight 700 using a bottom emitting RGB micro LED 715 (denoted as 715a, 715b, 715c) according to various embodiments is shown. The micro LED backlight 700 includes a transparent substrate 720. In some embodiments, the transparent substrate 720 is made of glass, translucent alumina, or some other transparent material.

The RGB micro LEDs 715 (ie, 715a, 715b, 715c) are connected to the transparent layer 710 using conductive traces (not shown). In some cases, the conductive trace is a metal trace to which the RGB micro LED 715 is soldered. In various cases, the conductive trace can be a zigzag or cedar pattern rather than a straight line to reduce artifacts and unwanted moiré patterns. The RGB micro LED 715 can be any kind of conventionally known red, green, or blue light emitting diode. Based on the disclosure herein, one of ordinary skill in the art will appreciate a variety of RGB light emitting diodes that can be used for different embodiments. The RGB micro LED 715 is placed so that the light emitted from the RGB micro LED 715 is directed to the diffuse reflection portion 755 formed on the opposite surface of the transparent base material 720. In some embodiments, the RGB microLED 715 is a lateral element in which contacts to both the p-type and n-type materials are located on the same side of each LED element. In another embodiment, the RGB microLED 715 is a vertically oriented device in which the contact with the p-type material is on one side of the device and the contact with the n-type material is on the other side of the device.

The use of the translucent alumina transparent substrate 720 means that its conductivity acts as a circuit board that connects the RGB microLEDs 715 (denoted as 715a, 715b, 715c) to the power supply and / or the control unit. It allows, so it offers some advantages. Translucent alumina also provides a relatively high thermal conductivity (about 40 W / m · K compared to about 1 W / m · K of glass). By using a material with such high thermal conductivity, the heat generated by the RGB micro LED 715 is transferred to the edge of the micro LED backlight 700 where a heat sink (not shown) can be placed outside the viewing opening. Provide a mechanism for lateral emission. Furthermore, the translucency of the translucent alumina helps to enhance the uniformity of the RGB light reflected and returned by the diffuse reflector 755. The diffuse reflector 755 can be made of any material that can reflect the light emitted by the RGB microLED 715 and return it through the transparent substrate 720. In one particular embodiment, the diffuse reflector 755 is made of aluminum sputtered onto a coarse substrate.

Referring to FIG. 7b, a display device 790 including a micro LED backlight 700 according to one or more embodiments is shown. As illustrated, the micro LED backlight 700 has red, green, and blue rays 760 (ie, 760a, 760b, 760c, 760d, 760e, 760f, 760g, 760h, which are components reflected by the reflective layer 755, The light rays shown by the 760i and 760j lines) are directed toward the liquid crystal display (LCD) panel 780. The liquid crystal display panel 780 can be any conventionally known device capable of selectively transmitting and / or color filtering the light received at each pixel position. Based on the disclosure herein, one of ordinary skill in the art will appreciate various LCD panels that can be used for different embodiments.

As shown, power is applied to the micro LED backlight 700 so that the RGB micro LED 715 is a component (shown by lines 765a, 765b, 765c, 766a, 766b, 766c, 767a, 767b, 767c) in red, green. , And blue light rays are emitted toward the diffuse reflector 755. This causes continuous red, green, and blue rays 760 to be reflected through the translucent substrate 720 towards the LCD panel 780. The LCD panel 780 can then act as previously known to allow light of the selected color to pass through the display at various pixel positions.

Referring to FIG. 8a, another micro LED backlight 800 using a bottom emitting blue micro LED 815 (denoted as 815a, 815b, 815c) according to various embodiments is shown. The micro LED backlight 800 includes a transparent base material 820. In some embodiments, the transparent substrate 820 is made of glass, translucent alumina, or some other transparent material. The reflection forming portion 836 is formed on one surface of the transparent substrate and includes a quantum dot layer 850 and a metal layer 855.

The blue micro LED 815 (ie, 815a, 815b, 815c) is connected to the transparent layer 810 using a conductive trace (not shown). In some cases, the conductive trace is a metal trace to which the blue micro LED 815 is soldered. In various cases, the conductive trace can be a zigzag or cedar pattern rather than a straight line to reduce artifacts and unwanted moiré patterns. The blue micro LED 815 can be any type of conventionally known blue light emitting diode. Based on the disclosure herein, one of ordinary skill in the art will appreciate a variety of blue light emitting diodes that can be used for different embodiments. The blue micro LED 815 is placed so that the light emitted from the blue micro LED 815 during operation is directed to the reflection forming portion 836 arranged on the surface opposite to the transparent base material 820. In some embodiments, the blue micro LED 815 is a lateral element in which contacts to both p-type and n-type materials are located on the same side of each LED element. In another embodiment, the blue microLED 815 is a vertical element with a contact with the p-type material on one side of the device and a contact with the n-type material on the other side of the element.

The use of the translucent alumina transparent substrate 820 means that its conductivity acts as a circuit board that connects the blue micro LEDs 815 (shown as 815a, 815b, 815c) to the power supply and / or the control unit. It allows, so it offers some advantages. Translucent alumina also provides a relatively high thermal conductivity (about 40 W / m · K compared to about 1 W / m · K of glass). By using a material having such a high thermal conductivity, the heat generated by the blue micro LED 815 is transferred to the edge of the micro LED backlight 800 on which a heat sink (not shown) can be placed outside the viewing opening. Provide a mechanism for lateral emission. Further, the translucency of the translucent alumina helps to enhance the uniformity of the RGB light reflected and returned by the quantum dots contained in the quantum dot layer 850.

The quantum dot layer 850 contains a large number of quantum dots that act to reflect the light emitted from the blue micro LED 315. In some cases, the size and shape of the quantum dots in the quantum dot layer 850 is such that when the blue light from the blue micro LED 815 hits each quantum dot, each quantum dot emits light in a defined frequency range. Designed. In some embodiments, when a blue ray from the blue microLED 815 hits the quantum dots of the quantum dot layer 850, it causes isotropic re-emission of red, green, or blue light. The quantum dot layer 850 can exhibit different configurations in different embodiments, as different approaches can be used to make the color transforming element identified as the quantum dot layer 850. As an example, a large number of quantum dots can be mixed into a polymer suspension over a large sheet (eg, by spray deposition or slot die coating).

The metal layer 855 acts both as a reflective layer and for sealing the quantum dots of the quantum dot layer 850. The metal layer 855 is formed after cutting the base material 820, and therefore the metal layer 855 is stretched so as to cover the cut side wall portion of the base material 820. The metal layer 855 can be made of any metal that is reflective and capable of transferring heat. In one particular embodiment, the metal layer 855 is a sputtered aluminum layer. Since it is intended that the quantum dots of the quantum dot layer 850 are used for reflection to reflect the blue light rays emitted from the blue micro LED 815 and returned through the transparent layer 820, the exposed side of the metal layer 855 can be freely accessed. Is. A heat sink 895 can be bonded to the metal layer 855 to cool the quantum dots. This cooling process can excite the quantum dots more strongly than if cooling is not possible, thus increasing the brightness.

With reference to FIG. 8b, a display device 890 including the micro LED backlight 800 according to one or more embodiments is shown. As shown, the micro LED backlight 800 contains red, green, and blue rays 860 (that is, 860a, 860b, 860c, 860d, 860e, 860f, 860g, 860h) which are components reflected from the reflection forming unit 836. , 860i, 860j line) is directed at the liquid crystal display (LCD) panel 880. The liquid crystal display panel 880 can be any conventionally known device capable of selectively transmitting and / or color filtering the light received at each pixel position. Based on the disclosure herein, one of ordinary skill in the art will appreciate various LCD panels that can be used for different embodiments.

As shown, power is applied to the micro LED backlight 800 to emit blue light, which is a component of the blue micro LED 815 (shown by lines 865a, 865b, 865c, 866a, 866b, 866c, 867a, 867b, 867c). It is directed toward the reflection forming unit 836, where the blue light beam is reflected from the quantum dots of the quantum dot layer 850. Depending on which type of quantum dot reflected the blue ray on the quantum dot layer 850, it reflects the red, green, or blue ray 860. The continuous blue rays reflected from the quantum dot layer 850 containing a large number of red, green, and blue quantum dots are reflected back through the transparent substrate 820 and are incident on the LCD panel 880. , And produces a blue ray 460. The LCD panel 880 can then act as previously known to allow light of the selected color to pass through the display at various pixel positions.

With reference to FIG. 9, a flowchart 900 of a method of manufacturing a backlit display device according to various embodiments is shown. A substrate having a first surface and a second surface is prepared according to the flowchart 900 (block 905). The substrate is formed of a transparent material such as glass or translucent alumina.

A reflective material is formed on the substrate (block 910). In some embodiments, the reflective material comprises a color transformant, such as a quantum dot layer made of a suspension containing quantum dots in a polymer, for example. In such a case, the step of forming the quantum dot layer includes a step of spray-forming or slot die-coating the suspension on the surface of the base material. In another embodiment, the reflective material is a QDEF bonded to a substrate. In yet another embodiment, the reflective material is, for example, a metal that can be sputtered onto the surface of the substrate. Based on the disclosure herein, one of ordinary skill in the art will appreciate a variety of materials that can be applied to the surface of the substrate to form the reflective layer. In some cases, the reflective material is, for example, a combination of quantum dot layers and metal layers, or a combination of material layers, including a combination of QDEF and metal layers.

A conductive material is formed on a portion of the opposite surface of the substrate (block 915). This conductive material provides a location for joining the micro LED to the substrate. In some embodiments, the conductive material is a metal formed on a substrate using film formation and lithographic processing. A large number of micro LEDs are bonded to the substrate at the position where the conductive material is present so that a part of the conductive material acts as a contact portion with the micro LED (block 920). The micro LED is bonded to the base material in such a direction that the light emitted from the micro LED passes through the base material and is directed toward the reflective material on the opposite surface of the base material. At this point, a lighting former or light source was made. This illumination forming part or light source is assembled relative to the LCD panel so that the light reflected from the reflective material enters the LCD panel through the substrate (block 925). Although not shown, in some cases the heat sink may be joined to the reflective layer and / or the surface of the substrate outside the resulting display device opening.

With reference to FIG. 10, a flowchart 1000 of another manufacturing method of the backlit display device according to some embodiments is shown. According to the flow chart 1000, a base material having a first surface and a second surface is prepared (block 1005). The substrate is formed of a transparent material such as glass or translucent alumina.

The light diffusing portion is formed on one surface of the substrate (block 1010) and the conductive material is formed on the opposite surface of the substrate (block 1015). This conductive material provides a position where the micro LED can be bonded to the substrate. In some embodiments, the conductive material is a metal formed on a substrate using film formation and lithographic processing. A large number of micro LEDs are bonded to the substrate at the position where the conductive material is present so that a part of the conductive material acts as a contact portion with the micro LED (block 1020). The micro LED is bonded to the base material in such a direction that the light emitted from the micro LED is separated from the base material.

Further, a reflective layer is provided (block 1040). The reflective layer can be, for example, a substrate made of a reflective material such as metal. Instead, the reflective layer can be a glass substrate to which a reflective color converter and / or a metal layer is bonded. The color conversion unit is, for example, a quantum dot layer or a QDEF. Based on the disclosure herein, one of ordinary skill in the art will appreciate the various reflective layers that can be used for different embodiments.

Assemble the substrate (including the microLED) relative to the reflective layer so that the microLEDs on the substrate emit light towards the reflective layer (block 1050). This assembly process may include, for example, joining the substrate to the reflective layer. As another example, the assembly process may include attaching structural elements to the outside of the resulting opening of the illumination formation. Based on the disclosure herein, one of ordinary skill in the art will appreciate various methods of assembling the substrate relative to the reflective layer. At this point, a lighting former or light source was made. The illumination former or light source is assembled relative to the LCD panel so that the light reflected from the reflective material returns through the substrate and enters the LCD panel (block 1050). Although not shown, in some cases the heat sink may be joined to the reflective layer and / or the surface of the substrate outside the resulting display device opening.

Referring to FIG. 11, in order to show the reduction in the thickness of the display device that can be realized by using the present embodiment, the conventional backlight type display device 1101 is replaced with the reflection backlight type display device according to some embodiments. Shown with 1100. It should be noted that the reduction in display device thickness as shown applies to any display device embodiment described herein.

As shown, the conventional backlight type display device 1101 includes a backlight base material 1121 to which the micro LED 1116 is attached, and an LCD panel 1181. To achieve the diffusion width (denoted as W) of the light (1106a, 1106b) emitted from the micro LED 1116 at an angle of 1130, the LCD panel 1181 is distanced from the surface of the backlight substrate 1121 to which the micro LED 1116 is mounted. Must be placed apart (indicated as D3). As a result, the total thickness of the display device is D1.

The reflective backlit display device 1100 includes a backlight base material 1120 to which the micro LED 1115 is attached, and an LCD panel 1180. The micro LEDs are directed so that the light passes through the backlight substrate and is emitted towards the reflective layer 1150 on the opposite surface of the backlight substrate 1120. In such an orientation, the light (1105a, 1105b) emitted from the micro LED 1115 at an angle of 1130 is reflected from the reflective layer 1150 as light 1110a, 1110b through the substrate 1120. In order to realize the same diffusion width (denoted as W) as that of the conventional backlight type display device 1101 for the light (1110a, 1110b) re-emitted from the reflective layer 1120, the LCD panel 1180 was attached with the micro LED 1116. It only has to be located at a distance (indicated as D4) from the surface of the backlight substrate 1120. Notably, D4 is considerably shorter than D3. This results in a total thickness of the display D2, which is also significantly shorter than D1. Therefore, one of the many advantages realized using the embodiments disclosed herein is the ability to manufacture thinner LCD displays.

In conclusion, the invention includes new systems, devices, methods, and arrangements that provide lighting. Although one or more embodiments of the present invention have been described in detail, those skilled in the art will appreciate various alternatives, modifications, and equivalents without departing from the spirit of the invention. For example, the reflective layer is often described as using a metal, but can be realized by using other materials including, but not limited to, a white paint. Therefore, the statements so far should not be taken as limiting the scope of the invention as defined by the appended claims.

Hereinafter, preferred embodiments of the present invention will be described in terms of terms.

Embodiment 1
In the LCD display device
LCD panel and
Including a micro light emitting diode (micro LED) backlight arranged relatively fixed to the LCD panel.
The micro LED backlight is
Reflection forming part and
With a transparent base material
Includes at least one micro LED element
The at least one micro LED element is such that the light emitted from the at least one micro LED element is reflected from the reflection forming portion and transmitted through the transparent substrate before reaching the LCD panel. A device that is arranged relative to the reflection forming portion and the transparent substrate.

Embodiment 2
The apparatus according to the first embodiment, further comprising a heat sink bonded to the reflection forming portion.

Embodiment 3
The transparent base material is the first transparent base material and
The reflection forming portion is
(A) A quantum dot layer formed on the second base material and a metal layer formed on the quantum dot layer.
(B) Quantum dot enhancement film and
(C) A quantum dot-enhanced film having a metal layer formed on one surface,
(D) With the metal layer
(E) A diffuse reflection portion arranged on the surface of the first base material and
(F) The first embodiment according to the first embodiment, which is selected from the group consisting of a quantum dot layer formed on the surface of the first base material and a metal layer formed on the quantum dot layer. apparatus.

Embodiment 4
The apparatus according to the first embodiment, wherein the transparent base material is formed of a material selected from the group consisting of glass and translucent alumina.

Embodiment 5
The at least one micro LED is a white LED and
The reflection forming portion is
(A) Metal layer and
(B) A diffuse reflection portion arranged on the surface of the base material and
(C) The apparatus according to the first embodiment, which is selected from the group consisting of white paint.

Embodiment 6
The base material is the first base material and
The at least one micro LED is a blue LED and
The reflection forming portion is
(A) A quantum dot layer formed on the second base material and a metal layer formed on the quantum dot layer.
(B) Quantum dot enhancement film and
(C) A quantum dot-enhanced film having a metal layer formed on one surface,
(D) The first embodiment described in Embodiment 1, which is selected from the group consisting of a quantum dot layer formed on the surface of the first base material and a metal layer formed on the quantum dot layer. Equipment.

Embodiment 7
The at least one micro LED includes a red LED, a green LED, and a blue LED.
The reflection forming portion is
(A) Metal layer,
(B) A diffuse reflection portion arranged on the surface of the base material and
(C) The apparatus according to the first embodiment, which is selected from the group consisting of white paint.

8th Embodiment
In the backlight device
With a transparent base material
A reflection forming portion formed on the first surface of the transparent base material and
Includes at least one micro light emitting diode (micro LED) disposed on the second surface of the transparent substrate.
The at least one micro LED is directed so that the light emitted from the at least one micro LED passes through the transparent substrate and then is reflected from the reflection forming portion to generate reflected light. , The device that transmits the reflected light through the transparent substrate before being provided as light emitted from the backlight device.

Embodiment 9
The reflection forming portion includes a metal layer and
The heat sink bonded to the metal layer
The device according to embodiment 7, further comprising.

Embodiment 10
The at least one micro LED comprises a blue LED.
The apparatus according to the seventh embodiment, wherein the reflection forming unit includes a quantum dot layer capable of performing color conversion of blue light emitted from the blue LED and reflecting red, green, and blue component lights. ..

Embodiment 11
The quantum dot layer is arranged on the transparent substrate and
The apparatus according to the tenth embodiment, wherein the quantum dot layer is sealed by a metal layer.

Embodiment 12
The at least one micro LED includes a red LED, a green LED, and a blue LED.
The apparatus according to the seventh embodiment, wherein the reflection forming portion includes a diffuse reflection portion arranged on the transparent base material.

Embodiment 13
The at least one micro LED comprises a blue LED.
7. The 7th embodiment, wherein the reflection forming unit includes a quantum dot enhancing film capable of performing color conversion of blue light emitted from the blue LED to reflect red, green and blue component lights. apparatus.

Embodiment 14
The apparatus according to the seventh embodiment, wherein the transparent base material is made of translucent alumina.

Embodiment 15
The device according to embodiment 7, wherein the transparent substrate is made of glass.

Embodiment 16
In the backlight device
Lighting forming part and
Including the reflection forming part
The lighting forming unit is
With a transparent base material
At least one micro light emitting diode (micro LED) arranged on the surface of the transparent substrate, wherein the light emitted from the at least one micro LED is directed away from the transparent substrate. Including micro light emitting diodes
The reflection forming portion includes a reflecting layer, and is positioned relative to the illumination forming portion so that the light emitted from the at least one micro LED is reflected as reflected light from the reflecting layer. Light is a device that transmits the transparent base material as light emitted from the backlight device.

Embodiment 17
The reflection forming portion includes a metal layer and
The heat sink bonded to the metal layer
The device according to embodiment 16, further comprising.

Embodiment 18
16. The apparatus according to embodiment 16, wherein the transparent substrate is translucent alumina.

Embodiment 19
16. The apparatus according to embodiment 16, wherein the transparent substrate is glass.

20th embodiment
The surface of the transparent base material on which the at least one micro LED is arranged is the first surface of the transparent base material.
The apparatus according to embodiment 16, wherein the illumination forming portion further includes a glass volume diffusing portion formed on the second surface of the transparent base material.

21st embodiment
The at least one micro LED is a blue LED and
The reflective layer is
A quantum dot-enhanced film capable of converting the blue light emitted from the blue LED to reflect red, green, and blue component lights, and
16. The apparatus according to embodiment 16, comprising a metal layer formed on a quantum dot-enhanced film.

Embodiment 22
The transparent base material is the first transparent base material and
The reflection forming portion includes the reflection layer arranged on the second transparent base material, and includes the reflection layer.
16. The apparatus of embodiment 16, wherein the light emitted from the at least one micro LED passes through the second substrate before being reflected from the reflective layer.

23rd Embodiment
The at least one micro LED is a blue LED and
22. The apparatus according to embodiment 22, wherein the reflective layer includes a quantum dot layer on the second transparent substrate and a metal layer formed on the quantum dot layer.

Embodiment 24
The zone division portion is formed on the second transparent base material, and the zone division portion is formed on the second transparent base material.
The zone dividing portion represents a tapered wall portion that extends at least partially between the first surface of the second transparent substrate and the second surface of the second transparent substrate. The device according to embodiment 23.

25.
The device according to embodiment 24, wherein the tapered side wall portion of the second transparent base material is covered with a metal layer.

Embodiment 26
25. The apparatus of embodiment 25, wherein the tapered side wall of the second transparent substrate is covered with both a quantum dot layer and a metal layer.

Embodiment 27
The at least one micro LED includes a red LED, a green LED, and a blue LED.
The reflective layer is
(A) Metal layer and
(B) Diffuse reflector and
(C) The apparatus according to embodiment 16, which is selected from the group consisting of white paint.

28.
The at least one micro LED is a white LED and
The reflective layer is
(A) Metal layer and
(B) A diffuse reflection portion arranged on the surface of the base material and
(C) The apparatus according to embodiment 16, which is selected from the group consisting of white paint.

100, 200, 300, 400, 500, 600, 700, 800 Micro LED backlight 105, 205 Scattering surface 110, 210, 310, 510, 610, 710, 810 Transparent layer 115, 215, 315, 415, 515, 615 , 715, 815 micro LED
120, 220 Flattening layer 121, 221, 321, 421, 521, 621 Illumination forming part 125, 225 Transparent conductive layer 130, 230 Adhesive 135, 235, 335 Base material 136, 236, 336, 436, 536, 636, 836 Reflection forming part 140a, 140b Zone dividing part 150, 250, 350, 450 Quantum dot layer 151, 251, 351, 555, 655 Reflection layer 155, 255, 355, 455, 855 Metal layer 180, 280, 380, 480, 580, 680, 780, 880 LCD panel 305, 505, 605 Volume diffuser 320, 420, 520, 620 Gap 755 Diffuse reflector

Claims (15)

In the LCD display device
LCD panel and
Including a micro light emitting diode (micro LED) backlight arranged relatively fixed to the LCD panel.
The micro LED backlight is
Reflection forming part and
With a transparent base material
Includes at least one micro LED element
The at least one micro LED element is such that the light emitted from the at least one micro LED element is reflected from the reflection forming portion and transmitted through the transparent substrate before reaching the LCD panel. A device that is arranged relative to the reflection forming portion and the transparent substrate. The apparatus according to claim 1, further comprising a heat sink bonded to the reflection forming portion. The transparent base material is the first transparent base material and
The reflection forming portion is
(A) A quantum dot layer formed on the second base material and a metal layer formed on the quantum dot layer.
(B) Quantum dot enhancement film and
(C) A quantum dot-enhanced film having a metal layer formed on one surface,
(D) With the metal layer
(E) A diffuse reflection portion arranged on the surface of the first base material and
(F) The first aspect of the present invention, which is selected from the group consisting of a quantum dot layer formed on the surface of the first base material and a metal layer formed on the quantum dot layer. apparatus. The apparatus according to claim 1, wherein the transparent substrate is formed of a material selected from the group consisting of glass and translucent alumina. The at least one micro LED is a white LED and
The reflection forming portion is
(A) Metal layer and
(B) A diffuse reflection portion arranged on the surface of the base material and
(C) The apparatus according to claim 1, which is selected from the group consisting of white paint. The base material is the first base material and
The at least one micro LED is a blue LED and
The reflection forming portion is
(A) A quantum dot layer formed on the second base material and a metal layer formed on the quantum dot layer.
(B) Quantum dot enhancement film and
(C) A quantum dot-enhanced film having a metal layer formed on one surface,
(D) The first aspect of the present invention, which is selected from the group consisting of a quantum dot layer formed on the surface of the first base material and a metal layer formed on the quantum dot layer. Equipment. The at least one micro LED includes a red LED, a green LED, and a blue LED.
The reflection forming portion is
(A) Metal layer,
(B) A diffuse reflection portion arranged on the surface of the base material and
(C) The apparatus according to claim 1, which is selected from the group consisting of white paint. In the backlight device
With a transparent base material
A reflection forming portion formed on the first surface of the transparent base material and
Includes at least one micro light emitting diode (micro LED) disposed on the second surface of the transparent substrate.
The at least one micro LED is directed so that the light emitted from the at least one micro LED passes through the transparent substrate and then is reflected from the reflection forming portion to generate reflected light. , The device that transmits the reflected light through the transparent substrate before being provided as light emitted from the backlight device. The reflection forming portion includes a metal layer and
The heat sink bonded to the metal layer
The device according to claim 7, further comprising. The at least one micro LED comprises a blue LED.
The apparatus according to claim 7, wherein the reflection forming unit includes a quantum dot layer capable of performing color conversion of blue light emitted from the blue LED and reflecting red, green, and blue component lights. .. The quantum dot layer is arranged on the transparent substrate and
The device according to claim 10, wherein the quantum dot layer is sealed with a metal layer. The at least one micro LED includes a red LED, a green LED, and a blue LED.
The apparatus according to claim 7, wherein the reflection forming portion includes a diffuse reflection portion arranged on the transparent base material. The at least one micro LED comprises a blue LED.
The reflection forming portion according to claim 7, wherein the reflection forming portion includes a quantum dot enhancing film capable of performing color conversion of blue light emitted from the blue LED to reflect red, green and blue component lights. apparatus. The device according to claim 7, wherein the transparent base material is made of translucent alumina. The device according to claim 7, wherein the transparent base material is made of glass.

Images