KR102650105B1 - Display device - Google Patents

Abstract

A display device is disclosed. The display device of the present disclosure includes: a display panel; an optical assembly providing light to the display panel; In addition, it may be located on an optical path provided from the optical assembly to the display panel and may include a light absorption layer that absorbs light of a certain range of wavelengths, and the light absorption layer may include a green phosphor and a red phosphor. , the optical assembly includes: a light source providing blue light; an encapsulant covering the surroundings of the light source; Additionally, it may include a phosphor located inside the encapsulant, and the color temperature of the image provided from the front of the display panel may be 8,000 to 12,000K.

Description

Display device {DISPLAY DEVICE}

This disclosure relates to display devices.

As the information society develops, the demand for display devices in various forms is increasing, and in response to this, in recent years, LCD (Liquid Crystal Display Device), PDP (Plasma Display Panel), ELD (Electro luminescent display), and VFD (Vacuum Fluorescent) have been developed. Various display devices such as OLED (Organic Light Emitting Diode) and OLED (Organic Light Emitting Diode) are being researched and used.

Among these, the LCD panel has a TFT substrate and a color substrate that face each other with a liquid crystal layer in between, and can display images using light provided from a backlight unit.

Recently, as interest in the image quality of display devices increases, color expression or color reproduction close to natural colors (true colors) is receiving important attention, and much research is being conducted on improving image quality to implement natural colors.

The present disclosure aims to solve the above-described problems and other problems.

Another purpose may be to provide a display device that can improve image quality.

Another purpose may be to provide a display device that can improve color gamut.

Another purpose may be to provide a display device that can effectively control the wavelength of light provided from the backlight unit.

Another purpose may be to provide a display device that can reduce material costs and improve productivity by lowering the concentration of phosphors provided in the light absorption layer.

Another purpose may be to provide a low-concentration light absorption layer that can be shared by multiple display models.

According to one aspect of the present disclosure for achieving the above or other objects, a display device includes: a display panel; an optical assembly providing light to the display panel; In addition, it may be located on an optical path provided from the optical assembly to the display panel and may include a light absorption layer that absorbs light of a certain range of wavelengths, and the light absorption layer may include a green phosphor and a red phosphor. , the optical assembly includes: a light source providing blue light; an encapsulant covering the surroundings of the light source; Additionally, it may include a phosphor located inside the encapsulant, and the color temperature of the image provided from the front of the display panel may be 8,000 to 12,000K.

The effects of the display device according to the present disclosure will be described as follows.

According to at least one of the embodiments of the present disclosure, a display device capable of improving image quality can be provided.

According to at least one of the embodiments of the present disclosure, a display device capable of improving color gamut can be provided.

According to at least one of the embodiments of the present disclosure, a display device capable of effectively controlling the wavelength of light provided from a backlight unit can be provided.

According to at least one of the embodiments of the present disclosure, it is possible to provide a display device that can reduce material costs and improve productivity by lowering the concentration of the phosphor provided in the light absorption layer.

According to at least one of the embodiments of the present disclosure, a low-concentration light absorption layer that can be shared by multiple display models can be provided.

Additional scope of applicability of the present disclosure will become apparent from the detailed description that follows. However, since various changes and modifications within the spirit and scope of the present disclosure may be clearly understood by those skilled in the art, the detailed description and specific embodiments such as preferred embodiments of the present disclosure should be understood as being given only as examples.

1 to 24 are diagrams showing examples of display devices according to embodiments of the present disclosure.

Hereinafter, embodiments disclosed in the present specification will be described in detail with reference to the attached drawings. However, identical or similar components will be assigned the same reference numbers regardless of reference numerals, and duplicate descriptions thereof will be omitted.

The suffixes “module” and “part” for components used in the following description are given or used interchangeably only for the ease of preparing the specification, and do not have distinct meanings or roles in themselves.

Additionally, in describing the embodiments disclosed in this specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed descriptions will be omitted. In addition, the attached drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the attached drawings, and all changes included in the spirit and technical scope of the present disclosure are not limited. , should be understood to include equivalents or substitutes.

Terms containing ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

The direction indications of up (U), down (D), left (Le), right (Ri), front (F), and back (R) shown in the drawings are only for convenience of explanation, and are hereby used in this specification. The disclosed technical idea is not limited.

Referring to FIG. 1, the display device 1 may include a display panel 10. The display panel 10 can display a screen.

The display device 1 has a first long side (LS1), a second long side (LS2) opposite the first long side (LS1), a first long side (LS1), and a second long side (LS2). It may include a first short side (SS1) adjacent to and a second short side (SS2) opposite the first short side (SS1). Meanwhile, for convenience of explanation, the lengths of the first and second long sides LS1 and LS2 are shown and described as being longer than the lengths of the first and second short sides SS1 and SS2. It may be possible that the length of (LS1, LS2) is approximately the same as the length of the first and second short sides (SS1, SS2).

The direction parallel to the long sides (LS1, LS2) of the display device 1 may be referred to as the left and right direction or the first direction DR1. The direction parallel to the short sides (SS1, SS2) of the display device 1 may be referred to as the vertical direction or the second direction DR2. The direction perpendicular to the long sides (LS1, LS2) and short sides (SS1, SS2) of the display device 1 may be referred to as the front-back direction or the third direction DR3.

The direction in which the display panel 10 displays images may be referred to as the front (F, z), and the opposite direction may be referred to as the rear (R). The first long side (LS1) can be called the upper side (U, y). The second long side (LS2) can be called the lower side (D). The first short side (SS1) can be referred to as the left side (Le, x). The second short side (SS2) can be called the right side (Ri).

The first long side (LS1), the second long side (LS2), the first short side (SS1), and the second short side (SS2) may be referred to as edges of the display device 1. Additionally, the point where the first long side (LS1), the second long side (LS2), the first short side (SS1), and the second short side (SS2) meet each other may be called a corner.

For example, the point where the first short side SS1 and the first long side LS1 meet may be referred to as the first corner C1. The point where the first long side (LS1) and the second short side (SS2) meet may be referred to as the second corner (C2). The point where the second short side (SS2) and the second long side (LS2) meet may be referred to as the third corner (C3). The point where the second long side (LS2) and the first short side (SS1) meet may be referred to as the fourth corner (C4).

Referring to FIG. 2, the display device 1 includes a display panel 10, a front cover 15, a guide panel 13, a backlight unit 20, a frame 60, and a back cover 70. You can.

The display panel 10 can form the front of the display device 1 and can display images. The display panel 10 can display an image by having a plurality of pixels output RGB (Red, Green or Blue) for each pixel in accordance with the timing. The display panel 10 can be divided into an active area where an image is displayed and a de-active area where an image is not displayed. The display panel 10 may include a front substrate and a rear substrate that face each other with a liquid crystal layer interposed therebetween. The display panel 10 may be referred to as an LCD panel.

The front substrate may include a plurality of pixels consisting of red, green, and blue subpixels. The front board can output light corresponding to the colors of red, green, or blue depending on the control signal.

The rear substrate may include switching elements. The rear substrate can switch pixel electrodes. For example, the pixel electrode can change the molecular arrangement of the liquid crystal layer according to an externally input control signal. The liquid crystal layer may include liquid crystal molecules. The arrangement of liquid crystal molecules can change in response to the voltage difference generated between the pixel electrode and the common electrode. The liquid crystal layer may transmit or block light provided from the backlight unit 20 to the front substrate.

The front cover 15 may cover at least a portion of the front and side areas of the display panel 10. The front cover 15 can be divided into a front cover located on the front of the display panel 10 and a side cover located on the side. The front cover and the side cover may be provided separately or may be provided as one body. At least one of the front cover or the side cover may be omitted. The front cover 15 can be referred to as a case top.

The guide panel 13 may surround the periphery of the display panel 10 and cover the side of the display panel 10. The guide panel 13 may be coupled to the display panel 10 or may support the display panel 10. The guide panel 13 may be referred to as a panel guide or side frame.

The backlight unit 20 may be located behind the display panel 10. The backlight unit 20 may include light sources. The backlight unit 20 may be coupled to the frame 60 from the front of the frame 60. The backlight unit 20 may be driven in a full driving method or a partial driving method such as local dimming or impulsive driving. The backlight unit 20 may include an optical sheet 40 and an optical layer 30.

The optical sheet 40 can evenly transmit light from the light source to the display panel 10. The optical sheet 40 may be composed of a plurality of layers. For example, the optical sheet 40 may include a prism sheet or a diffusion sheet. For example, the optical sheet 40 may be a double brightness enhancement film (DBEF). Meanwhile, the coupling portion 40d of the optical sheet 40 may be coupled to the front cover 15, the frame 60, or the back cover 70.

The frame 60 may be located behind the backlight unit 20 and may support the components of the display device 1. For example, a backlight unit 20, a PCB (Printed Circuit Board) on which a plurality of electronic devices are located, etc. may be coupled to the frame 60. The frame 60 may include a metal material such as aluminum alloy. Frame 60 may be referred to as a main frame or module cover.

The back cover 70 may cover the rear of the frame 60. The back cover 70 may be coupled to the frame 60 and/or the front cover 15. For example, the back cover 70 may be an injection molded product made of resin. For another example, the back cover 70 may include a metal material.

Meanwhile, a cable (not shown) may be electrically connected to the display panel 10 and a source PCB (not shown). The source PCB may be located at the rear of the frame 60.

Referring to Figures 3 and 4, the backlight unit 20 may include an optical layer 30 and an optical sheet 40. The optical layer 30 may include a substrate 32, at least one light source 34, a reflective sheet 36, and a diffusion plate 39.

The substrate 32 may be coupled to the front of the frame 60. The substrate 32 may have a plate shape or may be composed of a plurality of straps spaced apart from each other in the vertical direction. The substrate 32 may be made of at least one of polyethylene terephthalate (PET), glass, polycarbonate (PC), or silicon. The substrate 32 may be a printed circuit board (PCB).

At least one light source 34 may be mounted on the substrate 32. The plurality of light sources 34 may be spaced apart from each other on the substrate 32 . An electrode pattern for connecting the adapter and the light source 34 may be formed on the substrate 32. For example, a carbon nanotube electrode pattern for connecting the light source 34 and the adapter may be formed on the substrate 32.

For example, the light source 34 may be a light emitting diode (LED) chip or a light emitting diode package including at least one light emitting diode chip. The light source 34 may be a colored LED that emits at least one color such as red, green, blue, etc., or may be composed of a white LED. The colored LED may include at least one of a red LED, a green LED, or a blue LED. The light source 34 may be referred to as a light assembly 34.

The reflective sheet 36 may be located in front of the substrate 32. The reflective sheet 36 may be located on an area of the substrate 32 excluding the area where the light source 34 is formed. The reflective sheet 36 may have a hole 36a where the light source 34 is located.

Additionally, the reflective sheet 36 may include at least one of metal or metal oxide, which is a reflective material. For example, the reflective sheet 36 may include a metal and/or metal oxide having a high reflectivity, such as at least one of aluminum (Al), silver (Ag), gold (Au), or titanium dioxide (TiO2). You can. For example, resin may be deposited or applied onto the light source 34 and/or the reflective sheet 36. The resin can diffuse the light from the light source 34. Accordingly, the reflective sheet 36 can reflect the light from the light source 34 or the light reflected from the diffusion plate 39 forward.

The diffusion plate 39 may be located in front of the reflective sheet 36. The diffusion plate 39 can diffuse the light from the light source 34. The spacer 36b may be located between the reflective sheet 36 and the diffusion plate 39 and may support the rear side of the diffusion plate 39. Accordingly, an air gap can be formed between the reflective sheet 36 and the diffusion plate 39, and the light from the light source 34 can be spread widely by the air gap.

The optical sheet 40 may be located in front of the diffusion plate 39. The back of the optical sheet 40 may be in close contact with the diffusion plate 39, and the front of the optical sheet 40 may be in close contact with or adjacent to the back of the display panel 110. The optical sheet 40 may include at least one sheet.

For example, the optical sheet 40 may include a plurality of sheets with different functions. The first optical sheet 40a may be a diffusion sheet, and the second optical sheet 40b and the third optical sheet 40c may be prism sheets. The diffusion sheet prevents the light coming from the diffusion plate 39 from being partially concentrated, thereby making the distribution of light more uniform. The prism sheet can condense the light coming from the diffusion plate 39 and provide it to the display panel 10. Meanwhile, the number and/or location of the diffusion sheet and the prism sheet may be changed.

The coupling portion 40d may be formed on at least one edge of the optical sheet 40. The coupling portion 40d may be formed on at least one of the first optical sheet 40a, the second optical sheet 40b, or the third optical sheet 40c.

Referring to Figures 5 and 6, the backlight unit 20' may include an optical layer 30' and an optical sheet 40. The optical layer 30' may be located between the frame 60 and the display panel 10. The optical layer 30' may be supported by the frame 60. The optical layer 30' may include a substrate 32', at least one light source 34', a reflective sheet 37, and a light guide plate 38.

The light guide plate 38 may be located between the frame 60 and the optical sheet 40 and may be supported by the frame 60.

The substrate 32' may be adjacent to the circumference of the light guide plate 38 and may be coupled to one side of the guide panel 13. For example, the substrate 32' may be adjacent to the lower side of the light guide plate 38. The substrate 32' may be made of at least one of polyethylene terephthalate (PET), glass, polycarbonate (PC), or silicon. The substrate 32' may be a printed circuit board (PCB).

At least one light source 34' may be mounted on the substrate 32'. The plurality of light sources 34' may be spaced apart from each other on the substrate 32'. An electrode pattern for connecting the adapter and the light source 34' may be formed on the substrate 32'. For example, a carbon nanotube electrode pattern for connecting the light source 34' and the adapter may be formed on the substrate 32'.

For example, the light source 34' may be a light emitting diode (LED) chip or a light emitting diode package including at least one light emitting diode chip. The light source 34' may be a colored LED that emits at least one color such as red, green, blue, etc., or may be composed of a white LED. The colored LED may include at least one of a red LED, a green LED, or a blue LED. The light source 34' may be referred to as a light assembly 34'.

The reflective sheet 37 may be positioned between the frame 60 and the light guide plate 38 and may be supported by the frame 60. The reflective sheet 37 may include at least one of metal or metal oxide, which is a reflective material. For example, the reflective sheet 37 may include a metal and/or metal oxide having a high reflectivity, such as at least one of aluminum (Al), silver (Ag), gold (Au), or titanium dioxide (TiO2). You can.

Accordingly, the light source 34' can provide light to the edge of the light guide plate 38. Light entering the light guide plate 38 can be directed forward by the light guide plate 38 and the reflective sheet 37.

Referring to FIGS. 7 and 8, the display panel 10 may include a front substrate 10a, a rear substrate 10b, a color filter 10c, and polarizing films 10d and 10e. The color filter 10c may be located between the front substrate 10a and the rear substrate 10b. The first polarizing film 10d may be located on the front side of the front substrate 10a, and the second polarizing film 10e may be located on the back side of the rear substrate 10b. Between the front substrate 10a and the rear substrate 10b, a liquid crystal layer and a TFT may be additionally added, but description thereof will be omitted.

The light sources 34 and 34' may provide light to the optical sheet 40. Light dispersed and/or concentrated in the optical sheet 40 may be provided to the display panel 10. The display panel 10 can display images using this light.

Additionally, the light provided from the light sources 34 and 34' can be divided into light L1 before passing through the display panel 10 and light L2 passing through the display panel 10. Light (L1) and light (L2) may have different spectra.

Additionally, Figure 8 may be an example of the spectrum of light L1. The horizontal axis of FIG. 8 represents the wavelength of light (nm, wavelength), and the vertical axis of FIG. 8 represents the intensity of light (W, radiant flux). B in FIG. 8 may be the intensity or distribution of blue light.

At this time, the light sources 34 and 34' may be LEDs. Light sources 34, 34' may be blue LEDs. Light sources 34, 34' may provide light L1 of the wavelength and/or intensity shown in FIG. 8. For example, the light sources 34 and 34' may provide blue light with a wavelength of 430 to 465 nm. Meanwhile, when high-purity white light is provided to the display panel 10, high-purity color (i.e., high color expression) and good image quality can be realized in the display panel 10.

Referring to FIGS. 9 to 12 , the light absorption layer 50 may be provided from the light sources 34 and 34' and positioned on a path of light heading toward the display panel 10. For example, the light absorption layer 50 may include a quantum dot enhancement film (QD film) and/or a nano organic material film (NOM film).

Referring to FIG. 9 , the light absorption layer 50 may face the light source 34 . The light absorption layer 50 may be located on the rear side of the optical sheet 40. The light absorption layer 50 may be formed, adhered, or deposited on the back of the optical sheet 40.

Referring to FIG. 10 , the light absorption layer 50 may face the light source 34 with respect to the optical sheet 40 . The light absorption layer 50 may be located on the front of the optical sheet 40. The light absorption layer 50 may be formed, adhered, or deposited on the entire surface of the optical sheet 40.

Referring to FIG. 11 , the light absorption layer 50 may face the front of the light guide plate 38 . The light absorption layer 50 may be located on the rear side of the optical sheet 40. The light absorption layer 50 may be formed, adhered, or deposited on the back of the optical sheet 40.

Referring to FIG. 12 , the light absorption layer 50 may face the light guide plate 38 with respect to the optical sheet 40 . The light absorption layer 50 may be located on the front of the optical sheet 40. The light absorption layer 50 may be formed, adhered, or deposited on the entire surface of the optical sheet 40.

Referring to FIGS. 13 and 14 , the light absorption layer 50 may be located between the light sources 34 and 34' and the display panel 10. The light absorption layer 50 may include green phosphor (GP) and red phosphor (RP). For example, the green phosphor (GP) may be a particle of 3 to 7 micrometers (SrGa2S4:Eu), and the red phosphor (RP) may be a particle of 1 micrometer or less ((Sr,Ca)AlSiN3:Eu). there is.

The light L1 from the light sources 34 and 34' may be, for example, blue light (see FIG. 8) and may excite the green phosphor GP. The light L1 from the light sources 34 and 34' may be, for example, blue light (see FIG. 8) and may excite the red phosphor RP. At this time, the light L1 from the light source 34, 34' may have light characteristics such that light of the blue series (B, see FIG. 8) has a strong intensity, and as it passes through the light absorption layer 50, it may emit light of the green series (G). , the intensity of light (see solid line in FIG. 14) and red light (R, see solid line in FIG. 14) may change to increased or strengthened light (L2).

In other words, part of the light L1 from the light source 34, 34' is not absorbed or reflected by the green phosphor GP and red phosphor RP, but passes through the light absorption layer 50 and appears as blue B. and can be mixed with green (G) light and red (R) light emitted from the light absorption layer 50 to produce white light (L2).

Referring to FIGS. 15 and 16 , the light absorption layer 50 may be located between the light sources 34 and 34' and the display panel 10. The first light absorption layer 50a may include a green phosphor (GP), and the second light absorption layer 50b may include a red phosphor (RP). Alternatively, the first light absorption layer 50a may include not only the green phosphor (GP) but also a certain ratio of the red phosphor (RP). For example, the green phosphor (GP) may be a particle of 3 to 7 micrometers (SrGa2S4:Eu), and the red phosphor (RP) may be a particle of 1 micrometer or less ((Sr,Ca)AlSiN3:Eu). there is.

The first light absorption layer 50a may be a green phosphor (GP) or a QD film (Quantum Dot Enhancement Film) including a green phosphor (GP) and a red phosphor (RP). For example, the first light absorption layer 50a may have a thickness of about 90 micrometers. The first light absorption layer 50a may absorb blue light and emit green light. For example, the first light absorption layer 50a may absorb light in the 400 to 500 nm wavelength range. For example, the first light absorption layer 50a may absorb light in the 434 to 461 nm wavelength range.

The second light absorption layer 50b may be a NOM film (Nano Organic Material Film) including a red phosphor (RP). For example, the second light absorption layer 50b may have a thickness of about 3 micrometers. The second light absorption layer 50b may absorb green light and emit red light. For example, the second light absorption layer 50b may absorb light in the 500 to 600 nm wavelength range. For example, the second light absorption layer 50b may absorb light in the 524 to 557 nm wavelength range.

Additionally, the first light absorption layer 50a may be adhered to the second light absorption layer 50b. For example, the adhesive may be coated on the first light absorption layer 50a, and may be laminated and adhered to the second light absorption layer 50b. The first light absorption layer 50a and the second light absorption layer 50b may be collectively referred to as NOF (50, Nano Organic Film) or Hybrid NOF (50).

For example, the first light absorption layer 50a may be located between the light sources 34 and 34' and the display panel 10, and the second light absorption layer 50b may be located between the first light absorption layer 50a and the display panel. It can be located between (10). For another example, the second light absorption layer 50b may be located between the light sources 34 and 34' and the display panel 10, and the first light absorption layer 50a may be positioned between the second light absorption layer 50b and the display panel. It may be located between the panels 10.

The light L1 from the light sources 34 and 34' may be, for example, blue light (see FIG. 8) and may excite the green phosphor GP. Light (L0) excited and emitted from the green phosphor (GP) can excite the red phosphor (RP). At this time, the light L1 from the light sources 34 and 34' may have light characteristics such that the light of the blue series (B, see FIG. 8) has a strong intensity, and the first light absorption layer 50a and the second light absorption layer 50a As it passes through (50b), the intensity of green light (G, see solid line in FIG. 16) and red light (R, see solid line in FIG. 16) may increase or change into enhanced light (L3).

In other words, part of the light L1 from the light sources 34 and 34' is not absorbed or reflected by the green phosphor GP and red phosphor RP, but is absorbed by the first light absorption layer 50a and the second light absorption layer 50b. It may pass through and appear as blue light (B), and may be mixed with green light (G) and red light (R) emitted from the first light absorption layer (50a) and the second light absorption layer (50b) to produce white light ( L3) can be implemented.

Referring to FIG. 16, the dotted line represents the spectrum of light L2 provided to the display panel 10 through the light absorption layer 50 described above with reference to FIG. 13, and the solid line represents the spectrum of the light L2 described above with reference to FIG. 15. 1 shows the spectrum of light L3 provided to the display panel 10 through the light absorption layer 50a and the second light absorption layer 50b.

For example, the blue light L1 of the light source 34, 34' passes through the first light absorption layer 50a and is absorbed or reflected by the green phosphor GP to excite the green phosphor GP. (excitation), and the green phosphor (GP) can emit green (G) light (L0). The green light (G) light (L0) emitted by the green phosphor (GP) in the first light absorption layer (50a) is absorbed or reflected by the red phosphor (RP) while passing through the second light absorption layer (50b), and is absorbed by the red phosphor (RP). ) can be excited, and the red phosphor (RP) can emit red-based (R) light. This light conversion can be repeated by recycling between the reflective sheet (36, see FIGS. 9 and 10; 37, see FIGS. 11 and 12) and the optical sheet 40.

Accordingly, the half width (GW3) of the green light (G) of the light (L3, see FIG. 15) provided to the display panel 10 is that of the light (L2, see FIG. 13) provided to the display panel 10. It may be smaller than the half width (GW2). Here, if the half width of green light (G) decreases, the purity and color reproducibility of green light (G) can be improved.

In addition, the half width (RW3) of the red light (R) of the light (L3, see FIG. 15) provided to the display panel 10 is the half width of the light (L2, see FIG. 13) provided to the display panel 10. It may be smaller than (RW2). Here, if the half width of red light (R) decreases, the purity and color reproducibility of red light (R) can be improved.

Referring to FIG. 17, the light L2 provided to the display panel 10 described above with reference to FIG. 13 is displayed as a dotted line in RGB color coordinates, and the light provided to the display panel 10 described above with reference to FIG. 15 (L3) is displayed as a solid line in RGB color coordinates.

It can be confirmed that the green color coordinate of the light (L3, see FIG. 15) provided to the display panel 10 is closer to the boundary of G than the green color coordinate of the light (L2, see FIG. 13) provided to the display panel 10. In other words, the green purity of the light (L3, see FIG. 15) provided to the display panel 10 can be improved, which means that the color reproduction of the light (L3) provided to the display panel 10 is further improved. You can.

Referring to FIG. 18, the concentration of green phosphor GP in the first light absorption layer 50a' can be reduced. For example, the concentration of the green phosphor (GP) in the first light absorbing layer 50a' is the concentration of the green phosphor (GP) in the first light absorbing layer 50a (see the upper picture of FIG. 18) described above with reference to FIG. 15. It may be 50 to 55% smaller than For example, the concentration of the green phosphor (GP) in the first light absorbing layer 50a' is the concentration of the green phosphor (GP) in the first light absorbing layer 50a (see the upper picture of FIG. 18) described above with reference to FIG. 15. It may be 45% of In this case, the light absorption layer 50' may be referred to as a low-concentration light absorption layer 50' or a low-concentration hybrid NOF (50').

Referring to FIG. 19, the thickness t11 of the low-concentration light absorption layer 50' may be different from the thickness t10 of the light absorption layer 50. Alternatively, the thickness t11 of the low-concentration light absorption layer 50' may be equal to the thickness t10 of the light absorption layer 50. For example, the thickness t11 of the low-concentration light absorption layer 50' may be smaller than the thickness t10 of the light absorption layer 50.

For example, the thickness of the first light absorption layer 50a in the light absorption layer 50 may be 90 micrometers. The first barrier 51 and the second barrier 52 may face each other with respect to the first light absorption layer 50a, and the thickness of each of the first barrier 51 and the second barrier 52 is 12 micrometers. You can. The middle layer 54 may be coupled to the first barrier 51 through an adhesive layer 54b, and the thickness of the middle layer 54 may be 50 micrometers. The second light absorption layer 50b may be coupled to the middle layer 54 through an adhesive layer 54a, and the thickness of the second light absorption layer 50b may be 3 micrometers. The top layer 53 may be positioned between the top coating 53a and the second light absorption layer 50b, and the thickness of the top layer 53 may be 50 micrometers. The bottom layer 55 may be located between the bottom coating 55a and the second barrier 52. The bottom layer 55 may be coupled to the second barrier 52 through an adhesive layer 55b, and the thickness of the bottom layer 55 may be 100 micrometers. The thickness of the adhesive layers 54b, 54a, and 55b may be 8 micrometers. The thickness of coatings 53a and 55a may be 5 micrometers. The thickness (t10) of the light absorption layer 50 may be 350 micrometers.

For example, in the low-concentration light absorption layer 50', the first light absorption layer 50a' may have a thickness of 90 micrometers. The first barrier 51 and the second barrier 52 may face each other with respect to the first light absorption layer 50a', and each of the first barrier 51 and the second barrier 52 has a thickness of 12 micrometers. It can be. The second light absorption layer 50b may have an adhesive layer and may be coupled to the first barrier 51. The thickness of the second light absorption layer 50b including the adhesive layer may be 8 micrometers. The top layer 53 may be positioned between the top coating 53a and the second light absorption layer 50b, and the thickness of the top layer 53 may be 5 micrometers. The bottom layer 55 may be located between the bottom coating 55a and the second barrier 52. The bottom layer 55 may be coupled to the second barrier 52 through an adhesive layer 55b, and the thickness of the bottom layer 55 may be 75 micrometers. The thickness of the adhesive layer 55b may be 5 micrometers. The thickness of coatings 53a and 55a may be 5 micrometers. The thickness t11 of the low-concentration light absorption layer 50' may be 290 micrometers.

Referring to FIGS. 18 and 20, the dotted line in FIG. 20 represents light (L3) provided to the display panel 10 through the light absorption layer 50, that is, the Hybrid NOF 50, described above with reference to the upper picture of FIG. 18. represents the spectrum, and the solid line in FIG. 20 is the light (L3) provided to the display panel 10 after passing through the low-concentration light absorption layer 50', that is, the low-concentration Hybrid NOF 50', as described above with reference to the lower picture of FIG. 18. ') represents the spectrum.

For example, the blue light L1 of the light source 34, 34' passes through the first light absorption layer 50a' and is absorbed or reflected by the green phosphor GP. It can be excited, and the green phosphor (GP) can emit green (G) light. The green light (G) emitted by the green phosphor (GP) in the first light absorption layer (50a') passes through the second light absorption layer (50b) and is absorbed or reflected by the red phosphor (RP). It can be excited, and the red phosphor (RP) can emit red-based (R) light. This light conversion can be repeated by recycling between the reflective sheet (36, see FIGS. 9 and 10; 37, see FIGS. 11 and 12) and the optical sheet 40.

At this time, as the green phosphor GP is provided at a low concentration in the first light absorption layer 50a', the light conversion rate of the low concentration light absorption layer 50' may be lower than the light conversion rate of the light absorption layer 50.

Accordingly, compared to the case where the light L1 from the light sources 34, 34' passes through the light absorption layer 50, the light L1 from the light sources 34, 34' passes through the low-concentration light absorption layer 50'. When passing, the intensity of blue light (B) may increase or strengthen, and the intensity of green light (G) and red light (R) may decrease or weaken. In this case, the color temperature of the image provided from the front of the display panel 10 may be 15,000 to 18,000 K.

20 and 21, the light sources 34 and 34' may be blue LEDs. At this time, in order to set the desired color temperature, the density of the green phosphor (GP) can be adjusted in the Hybrid NOF (50) for each model (display panel). In this case, the number of Hybrid NOFs (50) increases as the number of models (display panels), which may reduce productivity and cause mixing of Hybrid NOFs (50) between models.

Referring to FIG. 22, the phosphor 34c may be located around the light sources 34 and 34'. For example, the phosphor 34c may be in powder form.

For example, the encapsulant 34b may include a phosphor 34c and cover the light sources 34 and 34'. The liquid encapsulant 34b mixed with the phosphor 34c covers the light sources 34 and 34' and can be hardened.

For another example, the housing 34a may provide a concave receiving space where the light sources 34 and 34' are located. The encapsulant 34b may include a phosphor 34c. The liquid encapsulant 34b mixed with the phosphor 34c may fill the receiving space of the housing 34a and be hardened, and may cover the light sources 34 and 34'.

The light from the light sources 34 and 34' may be blue light. For example, light sources 34 and 34' may be blue LEDs. The phosphor 34c may be yellow and/or a color (alpha) different from yellow. The phosphor 34c may include a yellow phosphor (YP) and a red phosphor (AP). For example, the yellow phosphor (YP) may be YAG (Yttrium Aluminum Garnet), La3Si6N11, LuAG (Al5Lu3O12), or Silicate. For example, the red phosphor (AP) may be (Sr, Ca)AlSiN3:Eu, or (Sr, Ca, Ba)2SiN8:Eu.

For example, in the phosphor 34c, the proportion of the yellow phosphor (YP) may be 42 to 62%, the proportion of the red phosphor (AP) may be 37 to 57%, and the phosphors (YP, AP) may be They can be mixed to 100% by adding them together within the range of the above ratio.

For example, the content ratio of red phosphor (AP) to yellow phosphor (YP) may be 0.71 to 0.93.

For example, the content of the phosphors (YP, AP) in the encapsulant 34b may be 5 to 10%. The encapsulant 34b may include a silicone material. Meanwhile, in comparison, if the content of the phosphors (YP, AP) in the encapsulant 34b is 25%, the light sources 34, 34' and the phosphors (YP, AP) can form a white LED assembly. there is.

Accordingly, the blue light from the light source (34, 34') can excite the phosphors (YP, AP) while being absorbed or reflected by the phosphors (YP, AP). ) may emit yellow and/or red light.

Referring to FIGS. 22 and 23, the dotted line in FIG. 23 indicates that the blue light of the light sources 34 and 34' described above with reference to the lower picture of FIG. 18 is transmitted to the low-concentration light absorption layer 50', that is, the low-concentration Hybrid NOF (50). ') and represents the spectrum of light (L3') provided to the display panel 10. In addition, the solid line in FIG. 23 indicates that the light L1' emitted as blue-based light from the light sources 34 and 34' and passed through the phosphor 34c and the encapsulant 34b is transmitted to the low-concentration light absorption layer 50', that is, the low-concentration light absorption layer 50'. It represents the spectrum of light (L3'') that passes through the hybrid NOF (50') and is provided to the display panel (10).

For example, the light (L1', especially the blue-based (B) light) emitted from the light sources 34, 34' as blue-based (B) light and passing through the phosphor 34c and the encapsulant 34b is 1 Passing through the light absorption layer (50a'), it is absorbed or reflected by the green phosphor (GP), thereby exciting the green phosphor (GP), and the green phosphor (GP) can emit green light (G). there is. The green (G) light (L0') emitted by the green phosphor (GP) in the first light absorption layer (50a') is absorbed or reflected by the red phosphor (RP) while passing through the second light absorption layer (50b), and is absorbed into the red phosphor (RP). (RP) can be excited, and the red phosphor (RP) can emit red (R) light. This light conversion can be repeated by recycling between the reflective sheet (36, see FIGS. 9 and 10; 37, see FIGS. 11 and 12) and the optical sheet 40.

Accordingly, compared to the case where the light from the light sources 34, 34' does not pass through the phosphor 34c and the encapsulant 34b, the light from the light sources 34, 34' passes through the phosphor 34c and the encapsulant 34b. When passing through 34b), the light (L3'') passing through the low-concentration Hybrid NOF (50') and provided to the display panel (10) may have a reduced or weakened intensity of blue light (B) and green light (L3''). The intensity of light in the red series (G) and light in the red series (R) may be increased or strengthened.

For example, the wavelength of the peak (center) region of the blue series (B) light (L3'') may be 443 to 450 nm. For example, the wavelength of the peak (center) region of the green light (G) of light (L3'') may be 530 to 550 nm. For example, the wavelength of the peak (center) region of the red series (R) of light (L3'') may be 610 to 630 nm.

This light (L3'') can implement white light. Additionally, the color temperature of the image provided from the front of the display panel 10 may be 8,000 to 12,000 K.

Furthermore, based on the intensity of blue light (B) provided to the display panel 10, the intensity of green light (G) may be 20 to 70%. Based on the intensity of blue light (B) provided to the display panel 10, the intensity of red light (R) may be 20 to 70%.

For example, based on the intensity of blue light (B) provided to the display panel 10, the intensity of green light (G) may be 35 to 40%. Based on the intensity of blue light (B) provided to the display panel 10, the intensity of red light (R) may be 21 to 28%.

For another example, based on the intensity of blue light (B) provided to the display panel 10, the intensity of green light (G) may be 37%. Based on the intensity of blue light (B) provided to the display panel 10, the intensity of red light (R) may be 25%.

22 and 24, the light sources 34 and 34' and the phosphor 34c may be collectively referred to as light assemblies 34, 34' and 34c.

To set the desired color temperature, for example, Model A (Display Panel A), Model B (Display Panel B), Model C (Display Panel C), Model D (Display Panel D), and Model E (Display Panel E) ) The optical assemblies 34 and 34 are each located in the first rank (RA), second rank (RB), third rank (RC), fourth rank (RD), and fifth rank (RE) in the CIE color coordinates. ', 34c) can be combined.

At this time, Model A (Display Panel A), Model B (Display Panel B), Model C (Display Panel C), Model D (Display Panel D), and Model E (Display Panel E) have the same low concentration light absorption layer (50'). ) can be shared.

Accordingly, in order to set the desired color temperature, the light assemblies 34, 34', and 34c of specific ranks are installed without the need to adjust the concentration of the green phosphor (GP) in the low-concentration light absorption layer 50' for each model (display panel). can be combined. In this case, one low-concentration light absorption layer 50' can be used per multiple models (display panels), thereby improving productivity.

1 to 24, a display device according to one aspect of the present disclosure includes: a display panel; an optical assembly providing light to the display panel; In addition, it may be located on an optical path provided from the optical assembly to the display panel and may include a light absorption layer that absorbs light of a certain range of wavelengths, and the light absorption layer may include a green phosphor and a red phosphor. , the optical assembly includes: a light source providing blue light; an encapsulant covering the surroundings of the light source; Additionally, it may include a phosphor located inside the encapsulant, and the color temperature of the image provided from the front of the display panel may be 8,000 to 12,000K.

The phosphor of the optical assembly may include a yellow phosphor and a red phosphor.

The content of the phosphor of the optical assembly relative to the encapsulant may be 5 to 10%.

The light absorption layer includes: a first light absorption layer located between the light assembly and the display panel and including the green phosphor; Additionally, it may include a second light absorption layer located between the first light absorption layer and the display panel and including the red phosphor.

The green phosphor in the first light absorption layer may include particles of 3 to 7 micrometers, and the red phosphor in the second light absorption layer may include particles of 1 micrometer or less.

The first light absorption layer may be thicker than the second light absorption layer, and the second light absorption layer may be adhered to the first light absorption layer.

The light passing through the light absorption layer and provided to the display panel may have an intensity of green light of 20 to 70%, based on the intensity of blue light (100%), and may have an intensity of red light of 20 to 70%. may be 20 to 70%.

The light passing through the light absorption layer and provided to the display panel may have an intensity of green light of 35 to 40%, based on the intensity of blue light (100%), and an intensity of red light. may be 21 to 28%.

The wavelength of the peak region of the blue-based light may be 443 to 450 nm, the wavelength of the peak region of the green-based light may be 530 to 550 nm, and the wavelength of the peak region of the red-based light may be: It may be 610 to 630 nm.

The display device includes: a frame on which the optical assembly is mounted; In addition, it may further include an optical sheet located between the optical assembly and the display panel and facing the optical assembly, and the light absorption layer may be located on one surface of the optical sheet.

The display device includes: a frame on which the optical assembly is mounted; a light guide plate coupled to the frame; And, it may further include an optical sheet located between the light guide plate and the display panel and facing the light guide plate, and the light assembly may be adjacent to the circumference of the light guide plate and may be mounted on the frame, and The light absorption layer may be located on one side of the light guide plate.

Any or other embodiments of the present disclosure described above are not exclusive or distinct from each other. In certain embodiments or other embodiments of the present disclosure described above, each configuration or function may be used in combination or combined.

For example, this means that configuration A described in a particular embodiment and/or drawing may be combined with configuration B described in other embodiments and/or drawings. In other words, even if the combination between components is not directly explained, it means that combination is possible, except in cases where it is explained that combination is impossible.

The above detailed description should not be construed as restrictive in any respect and should be considered illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

Claims (11)

display panel;
an optical assembly providing light to the display panel; and,
A light absorbing layer located on an optical path provided from the optical assembly to the display panel and including a first light absorbing layer including a green phosphor and a second light absorbing layer including a red phosphor,
The optical assembly:
A light source providing blue light;
an encapsulant covering the surroundings of the light source; and,
Located inside the encapsulant, it includes a phosphor including a yellow phosphor and a red phosphor,
The concentration of the green phosphor in the first light absorption layer is,
Based on the case where the optical assembly does not include the phosphor, the color temperature of the image provided from the front of the display panel is adjusted to be 15,000 to 18,000 K,
The content of the phosphor of the optical assembly relative to the encapsulant is,
A display device where the color temperature of an image provided from the front of the display panel is adjusted to 5 to 10% so that it is 8,000 to 12,000 K. delete delete According to claim 1,
The first light absorption layer is,
Located between the optical assembly and the display panel,
The second light absorption layer is,
A display device positioned between the first light absorption layer and the display panel. According to clause 4,
The green phosphor of the first light absorption layer is,
Contains particles of 3 to 7 micrometers,
The red phosphor of the second light absorption layer is,
A display device containing particles less than 1 micrometer. According to clause 4,
The first light absorption layer is thicker than the second light absorption layer,
A display device wherein the second light absorption layer is adhered to the first light absorption layer. According to claim 1,
The light that passes through the light absorption layer and is provided to the display panel,
Based on the intensity of blue light (100%),
The intensity of green light is 20 to 70%,
A display device with an intensity of red light of 20 to 70%. According to clause 7,
The light that passes through the light absorption layer and is provided to the display panel,
Based on the intensity of blue light (100%),
The intensity of green light is 35 to 40%,
A display device with an intensity of red light of 21 to 28%. According to clause 7,
The wavelength of the peak region of the blue light is,
443 to 450 nm,
The wavelength of the peak area of the green light is,
530 to 550 nm,
The wavelength of the peak region of the red light is,
A display device that is 610 to 630 nm. According to claim 1,
A frame on which the optical assembly is mounted; and,
It is located between the optical assembly and the display panel and further includes an optical sheet facing the optical assembly,
The light absorption layer is a display device located on one side of the optical sheet. According to claim 1,
A frame on which the optical assembly is mounted;
a light guide plate coupled to the frame; and,
It is located between the light guide plate and the display panel and further includes an optical sheet facing the light guide plate,
The optical assembly is,
Adjacent to the circumference of the light guide plate and mounted on the frame,
The light absorption layer is a display device located on one surface of the light guide plate.

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