KR102211672B1 - Optical film for mini led or micro led backlight unit - Google Patents

Abstract

Disclosed is an optical film for forming white light by transmitting light emitted from a mini LED (light emitting diode) or a micro LED. The optical film is disposed between the first and second base films and the first and second base films disposed parallel to each other, and is a red phosphor, a green phosphor and uniform scattering of the light. It may include a color conversion layer including the inorganic particles inducing in accordance with a predefined weight ratio. Here, the predefined weight ratio may be defined as a ratio of the weight of the red phosphor, the weight of the green phosphor, and the weight between the inorganic particles, which are determined based on a color coordinate value for the white light. In addition, the weight ratio of the red phosphor may be greater than the weight ratio of the green phosphor, and the weight ratio of the green phosphor may be defined to be greater than the weight ratio of the inorganic particles.

Description

Optical film for mini LED or micro LED backlight unit {OPTICAL FILM FOR MINI LED OR MICRO LED BACKLIGHT UNIT}

The present invention relates to an optical film for a mini LED or micro LED backlight unit, and more particularly, to an optical film that transmits the mini LED or micro LED light to form and diffuse white light.

With the progress of research on light emitting diodes (LEDs), light energy conversion efficiency of LEDs increases, and LEDs are rapidly replacing conventional light emitting devices.

LEDs currently being developed have advantages such as miniaturization, weight reduction, and low power consumption. Accordingly, LEDs are actively used as light sources of various image display devices.

The LED chip size is gradually becoming smaller. Examples of tiny LED chips include mini LEDs and micro LEDs. In general, a chip size of a mini LED may be defined as 100 μm to 200 μm, and a chip size of a micro LED may be defined as 5 μm to 100 μm. In the case of mini LED or micro LED, since each LED chip becomes a pixel or light source individually, restrictions on the size and shape of the display are resolved, and a clearer picture quality can be realized than when using a conventional light source.

In addition to miniaturization of the LED chip size, research on optical films to complement the LED light characteristics is also active.

The present invention provides an optical film that converts light emitted from a mini LED or micro LED into white light, minimizes luminance loss of light, and uniformly diffuses light.

An optical film for forming white light by transmitting light emitted from a mini LED or a micro LED according to various embodiments of the present disclosure includes a first base film and a second base film disposed parallel to each other, and the second base film. The color conversion is disposed between the 1 base film and the second base film, and includes a red phosphor, a green phosphor, and inorganic particles that induce uniform scattering of the light according to a predefined weight ratio. ) May include a layer. Here, the predefined weight ratio may be defined as a ratio of the weight of the red phosphor, the weight of the green phosphor, and the weight between inorganic particles, which are determined based on a color coordinate value for white light. In addition, the weight ratio of the red phosphor may be greater than the weight ratio of the green phosphor, and the weight ratio of the green phosphor may be defined as greater than the weight ratio of the inorganic particles.

According to various embodiments of the present disclosure, light emitted from a mini LED or micro LED can be easily converted into white light, minimizing luminance loss of light, and uniformly spreading light.

1 is an exploded view of a liquid crystal display according to an exemplary embodiment of the present invention.
2 shows a direct-type LED light source according to an embodiment of the present invention.
3 is a cross-sectional view of an optical film according to an embodiment of the present invention.
4 shows a color space of the International Lighting Commission according to an embodiment of the present invention.
5 shows a spectral spectrum measurement result according to an embodiment of the present invention.
6 is a cross-sectional view of an optical film according to another embodiment of the present invention.
7 is a cross-sectional view of an optical film according to another embodiment of the present invention.
8 is a perspective view of a diffusion lens layer according to an embodiment of the present invention.
9 illustrates optical separation measurement results according to an embodiment of the present invention.
10 illustrates a change in a light separation angle of a diffusion lens layer according to an embodiment of the present invention.
11 is a cross-sectional view of an optical film according to another embodiment of the present invention.
12 is a cross-sectional view of an optical film according to another embodiment of the present invention.
13 is a cross-sectional view of an optical film according to another embodiment of the present invention.
14 is a cross-sectional view of an optical film according to another embodiment of the present invention.
15 shows results of performance tests of an optical film according to an embodiment of the present invention.
16 shows results of performance tests of an optical film according to another embodiment of the present invention.

Hereinafter, the operating principle of a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, when it is determined that a detailed description of a related known function or configuration may obscure the subject matter of the present disclosure in describing an exemplary embodiment of the present disclosure, a detailed description thereof will be omitted. In addition, terms used in the following are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of users or operators. Therefore, the definition of the terms used should be interpreted based on the contents throughout the specification and functions corresponding thereto.

The backlight unit is a light source of a liquid crystal display (LCD). LCD is a device that cannot emit light by itself. Accordingly, the backlight unit including the light source irradiates light from the rear surface of the LCD toward the liquid crystal panel. Through this, an identifiable image can be implemented.

The backlight unit uses a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp, and a light emitting diode (LED, hereinafter referred to as LED) as light sources.

The backlight unit is divided into an edge type and a direct type according to the arrangement structure of the light source. The direct type can be divided into driving compared to the edge type, so that an image can be realized more delicately than the edge type.

Hereinafter, an optical film included in the direct-type LED backlight unit will be described in detail.

1 is an exploded view of a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 1, a liquid crystal display device (or a liquid crystal display (LCD) device) 1 includes a backlight unit 10 and a liquid crystal panel 20. In general, the backlight unit 10 may be provided at the rear of the liquid crystal panel 20 to irradiate light onto the liquid crystal panel 20. The backlight unit 10 includes a light source 11, a reflective sheet 12, a color conversion sheet 13, a diffusion lens sheet 14, a diffusion sheet 15, 18, a prism sheet 16, 17, and a reflective polarization sheet. Includes (19). Here, the backlight unit 10 may not include at least one of the elements 11 to 19 included in the backlight unit 10, or may be formed by adding other elements other than the elements 11 to 19. In addition, the backlight unit 10 may be formed in various combinations including at least one of the components 11 to 19 included in the backlight unit 10.

The light source 11 provides light. For example, the light source 11 may include a plurality of LED chips that emit light. As an example, referring to FIG. 2, the LED chips 11'-1 may be arranged in a tiled manner to form a direct type 11'.

Depending on the size of the LED chip, LEDs are large LED (chip size: 1,000 µm or more), medium LED (chip size: 300-500 µm), small LED (chip size: 200-300 μm), mini LED (chip size 100-200 μm), micro LED (chip size: 100 μm or less). Here, the LED may include a material such as InGaN or GaN.

As the chip size of the LED of the backlight unit decreases, the number of LEDs can be easily adjusted, so that the luminance characteristics and color uniformity of the liquid crystal display device 1 can be improved and slimmed. In addition, as the chip size of the LED decreases, power consumption can be reduced, thereby reducing battery consumption of portable devices and extending the life of the battery.

Compared to conventional direct-type LEDs, when using mini LEDs or micro LEDs, the size of the LEDs is reduced, so local dimming is possible. Image quality can be improved and power efficiency can be improved through local dimming. Here, the local dimming is a technology that controls the brightness of an LED used as a backlight based on a configuration or characteristic of a screen, and is a technology that can dramatically improve a contrast ratio and reduce power consumption. As an example of local dimming, the brightness of a mini LED or micro LED corresponding to a dark screen is relatively dark to express a dark color, and the brightness of a mini LED or micro LED corresponding to a bright screen is relatively bright to produce a vivid color. I can express it.

The reflective sheet 12 reflects light. The reflective sheet 12 transmits light in the divergence direction of the light emitted from the light source 11, and reflects the reflected light due to interfacial reflection from the top in the divergence direction of the light. Through this, loss of light can be minimized. The reflective sheet 12 may perform light recycling.

The color conversion sheet 13 converts the color of light emitted from the light source 11. For example, the light of the mini LED or micro LED is blue light (450 nm). In this case, blue light needs to be converted to white light. The color conversion sheet 13 may transmit blue light and simultaneously convert blue light into white light.

The diffusion lens sheet 14 diffuses light. The diffusion lens sheet 14 includes a plurality of light diffusion lenses on one surface. For example, the light diffusion lens may be formed in a pyramid shape to facilitate light diffusion.

The diffusion sheets 15 and 18 may uniformly disperse incident light. The diffusion sheets 15 and 18 are curable resins (e.g., at least one of urethane acrylate, epoxy acrylate, ester acrylate, ester acrylate, and radical-generating monomers) to which light diffusing agent beads are added. It can be used alone or as a mixture) to cause light diffusion by the optical dispersion beads. Further, in the diffusion sheets 15 and 18, a protrusion pattern (or protrusion) having a uniform or non-uniform size (for example, a sphere) may be disposed to promote light diffusion.

The prism sheets 16 and 17 may condense incident light using an optical pattern formed on the surface and emit light to the liquid crystal panel 20. The prism sheets 16 and 17 may be formed as an optical pattern layer in which an optical pattern in the form of a triangular array having an inclined surface of 45° is formed on the translucent base film in order to improve luminance in the front direction.

The reflective polarization sheet 19 is provided on the prism sheets 16 and 17 and serves to recycle the light by transmitting one polarized light and reflecting the other polarized light to the lower side of the light collected from the prism sheets 16 and 17. .

The liquid crystal panel 20 modulates the light irradiated from the light source 11 in a predetermined pattern according to an electric signal. The modulated light passes through a color filter and a polarization filter disposed on the front surface of the liquid crystal panel 20 to constitute a screen.

The configuration of the liquid crystal display device 1 according to an embodiment of the present invention has been described above. Hereinafter, various embodiments of the present application will assume the case of using a mini LED or micro LED as the light source 11 of the backlight unit, but including a light source 11 in which LEDs of uniform or various sizes are arranged in a direct manner. Various embodiments of the present disclosure may be applied to the backlight unit without limitation.

Hereinafter, an optical film according to various embodiments of the present disclosure will be described in detail.

Hereinafter, the optical film is defined as the color conversion sheet 13 of FIG. 1, or the color conversion sheet 13 and the reflective sheet 12 of 1, the diffusion lens sheet 14, the diffusion sheets 15 and 18, and the prism It may be defined as a combination of at least one of the sheets 16 and 17 and the reflective polarizing sheet 19.

3 is a cross-sectional view of an optical film according to an embodiment of the present invention.

Referring to FIG. 3, the optical film 30 may include base films 31 and 32 and a color conversion layer 33.

The base films 31 and 32 may be made of, for example, PET, PC, or PP. Here, the first base film 31 and the second base film 32 may be disposed parallel to each other. The base films 31 and 32 may protect the color conversion layer 33 to be described later.

The color conversion layer 33 converts colors. The color conversion layer 33 may convert blue light emitted from the mini LED or micro LED into white light.

The color conversion layer 33 may be disposed between the first base film 31 and the second base film 32.

-sialon 형광체가 있다. 또한, 무기입자는 광의 균일한 산란을 유도하기 위한 것이다. 무기입자의 예로는 직경이 수백 나노미터인 TiO2, SiO2가 있다.The color conversion layer 33 may include a red phosphor, a green phosphor, and inorganic particles. Here, the red phosphor or green phosphor is a material that forms red or green light by absorbing light emitted from a mini LED or micro LED. For example, a red phosphor is a KSF (K ₂ SiF ₆ :Mn4+) phosphor, a green phosphor is

-sialon phosphor. In addition, the inorganic particles are for inducing uniform scattering of light. Examples of inorganic particles include TiO2 and SiO2 having a diameter of several hundred nanometers.

For example, the color conversion layer 33 may be formed by stirring a red phosphor, a green phosphor, and an inorganic particle in a resin (silicone, acrylic, etc.). In this case, the color conversion layer 33 may be attached between the first base film 31 and the second base film 32.

For example, the color conversion layer 33 may include red phosphor, green phosphor, and inorganic particles according to a predefined weight ratio. Here, the predefined weight ratio is a weight ratio between the weight of the red phosphor, the weight of the green phosphor, and the inorganic particles determined based on the color coordinate values for white light.

Referring to FIG. 4, the color coordinate values for white light described above may be defined based on the Commission Internationale de l'Eclairage (CIE) color space 40. In this case, a color coordinate value for white light may be defined as an X coordinate value, a Y coordinate value, and a Z coordinate value defined in the color space 40.

For example, the X coordinate value and the Y coordinate value may be defined in 0.27 to 0.33, and the Z coordinate value may be defined as a dependent variable based on the defined X coordinate and Y coordinate.

For example, the weight ratio of the red phosphor is defined within 10% to 80%, the weight ratio of the green phosphor is defined within 10% to 80%, and the weight ratio of inorganic particles may be defined within 1% to 10%. have. In this case, it goes without saying that the total sum of the weight ratio of the red phosphor, the weight ratio of the green phosphor, and the weight ratio of the inorganic particles may be defined as 100% or less. In addition, when the weight ratio is not defined in %, the total sum of the weight ratios may be defined as 100 or less as well as 100 or less.

Here, an example in which the weight ratio of the red phosphor is larger than the weight ratio of the green phosphor and the weight ratio of the green phosphor is set to be larger than the weight ratio of the inorganic particles will be described with reference to FIG. 5 below.

5 shows a spectral spectrum measurement result according to an embodiment of the present invention.

In the embodiment of FIG. 5, the ratio of the weight of the red phosphor, the weight of the green phosphor and the weight of the inorganic particles included in the color conversion layer is set to 66:44:5. Here, the blue light emitted from the mini LED or micro LED is converted into white light while passing through the color conversion layer (or optical film). At the same time, light may be uniformly scattered to provide an appearance characteristic without mua.

The optical film 30 according to the above-described embodiment of FIG. 3 may further include an inorganic particle layer. This will be described below with reference to FIG. 6. Hereinafter, contents overlapping with the above-described optical film 30 will be omitted for convenience of description.

6 is a cross-sectional view of an optical film according to another embodiment of the present invention.

Referring to FIG. 6, the optical film 60 may include base films 61 and 62, a color conversion layer 63 and an inorganic particle layer 64.

The inorganic particle layer 64 may include the aforementioned inorganic particles. For example, the inorganic particle layer 64 may be formed by stirring an inorganic particle and a resin. In this case, the inorganic particle layer 64 may be attached to one surface of the first base film 61.

In the above-described example, the inorganic particle layer 64 may further include the above-described red phosphor and green phosphor. In addition, the position of the inorganic particle layer 64 may be disposed in exchange with the position of the color conversion layer 63. In addition, the inorganic particle layer 64 may be attached to one surface of the second base film 62.

7 is a cross-sectional view of an optical film according to another embodiment of the present invention.

Referring to FIG. 7, the optical film 70 includes base films 71 and 72, a color conversion layer 73, and a diffusion lens layer 74.

The diffusion lens layer 74 includes a plurality of lenses having a triangular pyramid (or pyramid) shape. Referring to FIG. 8, a plurality of lenses having a triangular pyramid shape are regularly arranged in the diffusion lens layer 74.

For example, the diffusion lens layer 74 may be disposed on one side of the first base film 71 or on one side of the second base film 72. In this case, the diffusion lens layer 74 may be a concept including the first base film 71 or the second base film 72.

The diffusion lens layer 74 may lightly separate light incident perpendicularly from the lower surface of the diffusion lens (in the direction of the first base film 72 in FIG. 7 ).

Specifically, referring to FIG. 9, the diffusion lens layer 74 may optically separate incident light by four surfaces of triangular pyramids protruding to the outside. Here, FIG. 9 shows the optical separation measurement result for the case where the mini LED light is incident from the upper surface of the diffusion lens layer 74 of the optical film 70 (in the opposite direction of the first base film 72 in FIG. 7 ). It is shown.

, 74-1), 높이(74-2) 및 폭(74-3)으로 정의될 수 있다. 예를 들어, 정점 각은 40 내지 150 내에서 정의되고, 높이(74-2)는 약 10μm, 폭(74-3)은 약 20μm로 정의될 수 있다.Referring to Figure 7, the triangular pyramid is the vertex angle (

, 74-1), height 74-2, and width 74-3. For example, the apex angle may be defined within 40 to 150, the height 74-2 may be defined as about 10 μm, and the width 74-3 may be defined as about 20 μm.

10 illustrates a change in a light separation angle of a diffusion lens layer according to an embodiment of the present invention.

The first graph 101 shows the change in the light separation angle according to the change in the PY apex angle when light is incident in the outer direction 101-2 of the triangular pyramid of the diffusion lens layer 101-1. do. Referring to the first graph 101, it can be seen that the light separation angle decreases as the vertex angle increases.

The second graph 102 shows the change of the light separation angle according to the change of the vertex angle when light is incident in the inner direction 102-2 of the triangular pyramid of the diffusion lens layer 102-1. Referring to the second graph 102, optical separation is not performed until the vertex angle increases to 100°, and the maximum optical separation occurs at the vertex angle 105, and the light separation angle increases as the vertex angle increases at 105°. It can be seen that it decreases.

Referring to the first graph 101 and the second graph 102, it can be seen that target optical separation can be induced by adjusting the vertex angle in a predetermined area.

In the above-described example, since incident light is separated (or light diffused) by the action of the diffusion lens layer 74, hot spots caused by incident light may be reduced.

11 is a cross-sectional view of an optical film according to another embodiment of the present invention.

Referring to FIG. 11, the optical film 110 includes base films 111 and 112, a color conversion layer 113, a diffusion lens layer 114, and an inorganic particle layer 115.

Here, the inorganic particle layer 115 may be disposed on one side of the second base film 112.

12 is a cross-sectional view of an optical film according to another embodiment of the present invention.

Referring to FIG. 12, the optical film 120 includes base films 121 and 122, a color conversion layer 123, a diffusion lens layer 124 and an inorganic particle layer 125.

Here, the inorganic particle layer 125 may be disposed on one surface of the first base film 121. In addition, the diffusion lens layer 124 may be disposed on one surface of the inorganic particle layer 125.

In various examples of the present invention described above, the optical film may further include a reflection pattern. Hereinafter, various embodiments including a reflective pattern will be described in detail.

13 is a cross-sectional view of an optical film according to another embodiment of the present invention.

Referring to FIG. 13, the optical film 130 includes base films 131 and 132, a color conversion layer 133 and a reflective pattern 134.

The reflective pattern 134 reflects light. The reflection pattern can implement light recycling by reflecting light.

The reflective pattern 134 may be disposed or attached to at least one of one side of the first base film 131 or one side of the second base film 132. For example, the reflective pattern 134 may be formed on one side of the first base film 131 or on one side of the second base film 132 through a light/UV curing process. Here, the reflection pattern may have a regular or irregular shape.

For example, the areas 134-1, 134-2, and 134-3 between the reflective patterns 134 correspond to the location of the mini LED or the micro LEDs 135-1, 135-2, 135-3. Can be. Specifically, the areas 134-1, 134-2, and 134-3 between the reflective patterns 134 may accommodate mini LEDs or micro LEDs 135-1, 135-2 and 135-3. .

Through this, it is possible to implement local dimming of individually controlling the mini LEDs or the micro LEDs 135-1, 135-2, and 135-3. Through local dimming, it is possible to adjust the light luminance. Further, since the reflection pattern regions other than the regions 134-1, 134-2, and 134-3 between the reflection patterns 134 faithfully implement light reflection, the degree of light recycling may be increased.

For example, the regions 134-1, 134-2, and 134-3 between the reflective patterns 134 are based on a predefined weight ratio, such as a red phosphor, a green phosphor, and a It may contain inorganic particles. In this case, the optical film 13 may perform color conversion even without a separate color conversion single layer 133.

14 is a cross-sectional view of an optical film according to another embodiment of the present invention.

Referring to FIG. 14, the optical film 140 includes base films 141 and 142, a color conversion layer 143, a reflection pattern 144, and a diffusion lens layer 145.

Here, the optical film 140 may further include a diffusion lens layer 145 to facilitate diffusion of white light emitted from the color conversion layer 143.

15 shows results of performance tests of an optical film according to an embodiment of the present invention.

The performance experiment of the optical film of FIG. 15 is Rec. It was based on 2020 (UHDTV) criteria, and the luminance (or luminance gain) was defined within 170% to 230%, and the color gamut was defined below 61%.

In the first experiment 151, the optical film (for example, the optical film 30) includes a color conversion layer. Here, the light source is a mini LED or a micro LED, and an optical distance (OD) between the light source and the optical film is set to 1 mm.

In this case, the stacking thickness of the light source and the optical film is 205 μm, luminance 100%, luminance uniformity 83%, color gamut 54%, color difference 0.0158 / 0.0399, and white x/y is measured as 0.2323 / 0.2162.

In the second experiment 152, the optical film (for example, the optical film 70) includes a color conversion layer and a diffusion lens layer. Here, the width of the triangular pyramid of the diffusion lens layer is 20 μm, the light source is a mini LED or micro LED, and the optical distance between the light source and the optical film is set to 1 mm.

In this case, the laminated thickness of the light source and the optical film is measured as 255 μm, luminance 174%, luminance uniformity 83%, color gamut 57%, color difference 0.0158 / 0.0379, and white x/y as 0.2503 / 0.2624.

In the third experiment 153, the optical film includes a color conversion layer, a diffusion lens layer, a diffusion sheet (eg, a diffusion sheet in FIG. 1), and a prism sheet (eg, a prism sheet in FIG. 1). Here, the width of the triangular pyramid of the diffusion lens layer is 20 μm, the light source is a mini LED or micro LED, and the optical distance between the light source and the optical film is set to 1 mm.

In this case, the laminated thickness of the light source and the optical film is measured as 423 μm, luminance 215%, luminance uniformity 79%, color gamut 61%, color difference 0.0168 / 0.0379, and white x/y 0.2849 / 0.3433.

In the experimental results described above, since the optical film of the first experiment 151 includes a color conversion layer, high luminance (100%) and high luminance uniformity (83%) performance are realized. In addition, the optical film of the second experiment 152 further includes a diffusion lens layer in the optical film of the first experiment 151 to improve luminance (174%), color gamut enhancement (57%), and light distribution enhancement (first experiment). See also the light distribution in (151), exhibiting the effect of condensing light through the light distribution, and improving spectral properties (reducing the peak of white light intensity). In addition, the optical film of the third experiment 153 further includes a diffusion sheet and a prism sheet in the optical film of the second experiment 152 to improve luminance (215%), improve color gamut (61%), and improve light distribution ( (Refer to the optical distribution diagram in experiment 152) and improves spectral properties (reduces the peak of white light intensity).

16 shows results of performance tests of an optical film according to another embodiment of the present invention.

The performance experiment of the optical film of FIG. 16 is Rec. It was based on 2020 (UHDTV) criteria, and the luminance (or luminance gain) was defined within 110% to 280%, and the color gamut was defined at 58% or less.

In the first experiment 161, the optical film (for example, the optical film 30) includes a color conversion layer. Here, the light source is a mini LED or a micro LED, and an optical distance (OD) between the light source and the optical film is set to 1 mm.

In this case, the laminated thickness of the light source and the optical film is measured as 200 μm, luminance 100%, luminance uniformity 73%, color gamut 46%, 9P color difference 0.0118 / 0.0322, and White x/y 0.2067 / 0.1651.

In the second experiment 162, the optical film (for example, the optical film 70) includes a color conversion layer and a diffusion lens layer. Here, the width of the triangular pyramid of the diffusion lens layer is 10 μm, the light source is a mini LED or micro LED, and the optical distance between the light source and the optical film is set to 1 mm.

In this case, the laminated thickness of the light source and the optical film is measured as 288 μm, luminance 187%, luminance uniformity 76%, color gamut 52%, color difference 0.0128 / 0.0429, and white x/y 0.2251 / 0.2218.

In the third experiment 163, the optical film includes a color conversion layer, a diffusion lens layer, a diffusion sheet (eg, a diffusion sheet in FIG. 1), and a prism sheet (eg, a prism sheet in FIG. 1). Here, the width of the triangular pyramid of the diffusion lens layer is 10 μm, the light source is a mini LED or micro LED, and the optical distance between the light source and the optical film is set to 1 mm.

In this case, the laminated thickness of the light source and the optical film was measured as 475 μm, luminance 236%, luminance uniformity 79%, color gamut 58%, color difference 0.0149 / 0.047, and white x/y 0.264 / 0.3118.

In the above-described experimental results, since the optical film of the first experiment 161 includes a color conversion layer, high luminance (100%) and high luminance uniformity (73%) performance are realized. In addition, the optical film of the second experiment (162) further includes a diffusion lens layer in the optical film of the first experiment (161), thereby improving luminance (187%), gamut enhancement (52%), luminance uniformity improvement, and spectral properties. (Reduction of white light intensity peak) is realized. In addition, the optical film of the third experiment 163 further includes a diffusion sheet and a prism sheet in the optical film of the second experiment 162, thereby improving luminance (236%), gamut enhancement (58%), luminance uniformity improvement, It is realizing lightness improvement (reduction of the peak of white light intensity).

As described above, embodiments of the present invention have been shown and described, but those skilled in the art will make various changes in form and detail without departing from the spirit and scope of the present embodiment as defined by the appended claims and equivalents thereto. You will understand that you can.

Liquid crystal display: 1 Backlight unit: 10
LCD panel: 20 Light source: 11, 11'
Reflective sheet: 12 Color conversion sheet: 13
Diffusion lens sheet: 14 Diffusion sheet: 15, 18
Prism sheet: 16, 17 Reflective polarization sheet: 19
Optical film: 30, 60, 70, 110, 140
Base film: 31, 32, 61, 62, 71, 72, 111, 112, 121, 122, 131, 132, 141, 142
Color conversion layer: 33, 63, 73, 113, 123, 133, 143
Inorganic particle layer: 54, 64, 115, 125
Diffusion lens layer: 74, 11-1, 12-1, 114, 145
Reflection pattern: 133.4 144

Claims (10)

In the optical film for forming white light by transmitting light emitted from a mini LED (light emitting diode) or a micro LED,
A first base film and a second base film disposed parallel to each other; And
Color conversion ( color conversion) layer; including,
Here, the predefined weight ratio is,
It is a ratio between the weight of the red phosphor, the weight of the green phosphor, and the weight of the inorganic particles,
The weight ratio of the red phosphor is greater than the weight ratio of the green phosphor, the weight ratio of the green phosphor is greater than the weight ratio of the inorganic particles,
The weight ratio of the red phosphor is 10% to 80%, the weight ratio of the green phosphor is 10% to 80%, and the weight ratio of the inorganic particles is 1% to 10%, the optical film.
The method of claim 1,
The color coordinate value for the white light is,
Optical film, which is an X coordinate value, a Y coordinate value and a Z coordinate value defined in the Commission internationale de l'Eclairage (CIE) color space.
delete The method of claim 1,
The ratio between the weight of the red phosphor, the weight of the green phosphor, and the weight of the inorganic particles is 66:44:5.
The method of claim 1,
One side of one of the first base film and the second base film is to arrange a plurality of lenses having a triangular pyramid shape, the optical film.
The method according to claim 1 or 5,
Inorganic particle layer comprising the inorganic particle; further comprising, an optical film.
The method of claim 5,
One surface of the first base film and the second base film different from the one has a plurality of reflection patterns disposed thereon.
The method of claim 7,
Regions between the plurality of reflection patterns,
The optical film corresponding to the location of the mini LED or the location of the micro LED.
The method of claim 8,
The regions between the plurality of reflection patterns,
The mini LED or the micro LED is accommodated, the optical film.
The method of claim 1,
The red phosphor is a KSF phosphor, and the green phosphor is

-sialon phosphor, and the inorganic particles are TiO2 or SiO2, optical film.

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