KR20090098152A - Fluorescent lamp mixture, Fluorescent lamp having the same and Display device having same - Google Patents

Abstract

The fluorescent lamp includes a lamp body, a fluorescent layer and a discharge electrode. The lamp body has a discharge space in which ultraviolet light is generated. The fluorescent layer includes a fluorescent mixture comprising 45 to 50% by weight of SCA, 29 to 33% by weight of YOX, and 20 to 26% by weight of CMZ, and is formed on the inner wall of the lamp body to show the ultraviolet rays. Convert to rays The discharge electrode is disposed at an end of the lamp body to apply a voltage to the discharge space. Therefore, the color reproducibility of the fluorescent lamp is improved and the image quality of the display device is improved.

Description

Fluorescent mixture for fluorescent lamp, fluorescent lamp having same and display device having same {Fluorescent Mixture, Fluorescent Lamp Having The Same And Display Device Having The Same}

The present invention relates to a fluorescent mixture for a fluorescent lamp, a fluorescent lamp having the same, and a display device having the same, and more particularly, to a color reproducibility including a fluorescent mixture for a fluorescent lamp, a fluorescent lamp including the fluorescent mixture, and the fluorescent lamp. An improved display device is provided.

Liquid crystal displays have various characteristics such as thin thickness, light weight, low driving voltage, and low power consumption, and thus are widely used in various fields.

A liquid crystal display device includes a liquid crystal display panel that is a passive type device that does not generate light by itself, and a backlight assembly for providing light to the liquid crystal display panel is required.

The backlight assembly may include a Cold Cathode Fluorescent Lamp (CCFL), an External Electrode Fluorescent Lamp (EEFL), a Flat Fluorescent Lamp, a Light Emitting Diode (LED), and the like. It includes a light source. The fluorescent lamps are widely used in liquid crystal displays having various sizes due to their low cost, long life, and low heat generation.

The fluorescent lamp includes an electrode, a discharge space filled with a discharge gas, a fluorescent layer, and the like. When a discharge voltage is applied to the electrode, the discharge gas in the discharge space generates excitons. When the ultraviolet rays generated by the excitons enter the fluorescent layer, they are emitted as visible light from the fluorescent layer.

The fluorescent layer includes a fluorescent material. The luminance, color, color reproducibility, etc. of the visible light are changed according to the type of the fluorescent material. Color reproducibility is a criterion for expressing the color representation of the liquid crystal display. The color representation of the liquid crystal display is expressed as a percentage of the color representation of the CIE1931 color coordinate system, the CIE1976 color coordinate system, and the NTSC color coordinate system. However, when the fluorescent layer contains the fluorescent material having high reproducibility, the luminance of the visible light is lowered. On the other hand, when the fluorescent layer includes a fluorescent material having high brightness, color reproducibility of the visible light is reduced.

In addition, the visible light may include red, green, and blue, and a fluorescent material having high luminance and color reproducibility of one of the red, green, and blue colors may lower the luminance or color reproducibility of the remaining colors. In particular, the wavelength of light generated by the conventional green phosphor is nonuniform, causing a problem of disturbing the light of the blue wavelength.

Accordingly, the present invention has been made in view of such problems, and the present invention provides a fluorescent mixture for fluorescent lamps.

In addition, the present invention provides a fluorescent lamp comprising the fluorescent mixture.

In addition, the present invention provides a display device including the fluorescent lamp having improved color reproducibility.

Fluorescent mixture according to one aspect of the present invention is 45 to 50% by weight of (Sr, Ca, Ba, Mg) ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ (SCA); 29 to 33 weight percent Y ₂ O ₃ : Eu ³⁺ (YOX); And 20 to 26 weight percent of (Ce, Mg, Zn) Al ₁₁ O ₁₉ : Mn ²⁺ (CMZ).

According to another aspect of the present invention, a fluorescent lamp includes a lamp body, a fluorescent layer, and a discharge electrode. The lamp body has a discharge space in which ultraviolet light is generated. The fluorescent layer is 45 to 50% by weight of (Sr, Ca, Ba, Mg) ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ (SCA), and 29 to 33% by weight of Y ₂ O ₃ : Eu ³⁺ ( YOX) and a fluorescent mixture comprising 20 to 26% by weight of (Ce, Mg, Zn) Al ₁₁ O ₁₉ : Mn ²⁺ (CMZ), which is formed on an inner wall of the lamp body to emit the ultraviolet light. To. The discharge electrode is disposed at an end of the lamp body to apply a voltage to the discharge space.

The spectrum of the visible light may have a ratio of the intensity at the wavelength of 445 nm and the intensity at the wavelength of 517 nm 1: 0.40 to 1: 0.50. The spectrum of the visible light may have a ratio of the intensity at a wavelength of 445 nm and the intensity at a wavelength of 612 nm of 1: 1.50 to 1: 1.60. Preferably, the spectrum of the visible light may have a ratio of an intensity at a wavelength of 445 nm, an intensity at a wavelength of 517 nm and an intensity at a wavelength of 612 nm of 1: 0.46: 1.55.

The fluorescent mixture may include 45 to 50 wt% SCA, 29 to 33 wt% YOX, and 20 to 26 wt% CMZ. The fluorescent mixture may comprise 47 wt% SCA, 31 wt% YOX, and 22 wt% CMZ.

A display device according to still another embodiment of the present invention includes a fluorescent lamp, an optical member, and a display panel. The fluorescent lamp includes a lamp body in which a discharge space in which ultraviolet light is generated is formed; 45-50% by weight of (Sr, Ca, Ba, Mg) ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ (SCA), 29-33% by weight of Y ₂ O ₃ : Eu ³⁺ (YOX), 20 to 26% by weight of a fluorescent mixture comprising (Ce, Mg, Zn) Al ₁₁ O ₁₉ : Mn ²⁺ (CMZ), formed on the inner wall of the lamp body to convert the ultraviolet light into visible light layer; And a discharge electrode disposed at an end of the lamp body to apply a voltage to the discharge space. The optical member is disposed on the fluorescent lamp to improve the optical characteristics of the visible light generated by the fluorescent lamp. The display panel displays an image including a plurality of color filters disposed on the optical member and through which light provided from the optical member is transmitted.

The color filters may include a red color filter that generates red light, a green color filter that generates green light, and a blue color filter that generates blue light. The intensity at the wavelength of 445 nm and the intensity at the wavelength of 513 nm of the red light passing through the red color filter may have a ratio of 1: 0.13 to 1: 0.14. The color coordinates of the blue light may be (0.23, 0.67) to (0.24, 0.68) based on the CIE1931 color coordinate system. The color coordinates of the white light generated by mixing the red light, the green light, and the blue light may be (0.29, 0.29) to (0.30, 0.30) based on the CIE1931 color coordinate system.

According to such a fluorescent mixture for a fluorescent lamp, a fluorescent lamp having the same, and a display device having the same, the color purity of light generated by the green phosphor is improved by using CMZ as the green phosphor.

In addition, the disturbance between the light generated in the green phosphor and the blue light or the disturbance between the light generated in the green phosphor and the red light is reduced, thereby improving the color purity of the blue light or the red light having a similar wavelength region to the light produced in the green phosphor. Thus, color reproducibility and image quality of the display device are improved.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments and may be implemented in other forms. The embodiments introduced herein are provided to make the disclosure more complete and to fully convey the spirit and features of the present invention to those skilled in the art. In the drawings, the thickness of each device or film (layer) and regions is exaggerated for clarity of the invention, and each device may have various additional devices not described herein, If a film (layer) is said to be located on another film (layer) or substrate, it may be formed directly on the other film (layer) or substrate or an additional film (layer) may be interposed therebetween.

Fluorescent mixture for display device

The fluorescent mixture according to the present invention includes a red fluorescent substance, a blue fluorescent substance, and a green fluorescent substance.

Examples of the red phosphor include (Sr, Ca, Ba, Mg) ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ (SCA).

When the ratio of the SCA is 45% by weight or less, the luminance of the red light decreases and color reproducibility decreases, which is not preferable. In addition, when the ratio of the SCA is 50% by weight or more, the luminance of the red light is increased, but the light of the green wavelength is disturbed and the color reproducibility is lowered, which is not preferable. Therefore, the content of the red fluorescent substance in the fluorescent mixture according to the present invention is 45 to 50% by weight, preferably 47 to 50% by weight, more preferably 47% by weight.

Examples of the blue phosphor include Y ₂ O ₃ : Eu ³⁺ (YOX).

When the ratio of YOX is 29% by weight or less, the luminance of blue light decreases and color reproducibility decreases, which is not preferable. In addition, when the ratio of YOX is 33% by weight or more, the luminance of blue light increases but the luminance of red and green light decreases, which is not preferable because the color reproducibility decreases. Therefore, the content of blue fluorescent substance in the fluorescent mixture according to the present invention is 29 to 33% by weight, preferably 30 to 33% by weight, more preferably 31% by weight.

Examples of the green phosphor include (Ce, Mg, Zn) Al ₁₁ O ₁₉ : Mn ²⁺ (CMZ).

When the ratio of the CMZ is 20% by weight or less, the luminance of green light decreases and color reproducibility decreases, which is not preferable. In addition, when the ratio of the CMZ is 26% by weight or more, the luminance of the green light increases but the light of the red wavelength is disturbed and the color reproducibility is lowered, which is not preferable. Therefore, the content of the green fluorescent substance in the fluorescent mixture according to the present invention is 20 to 26% by weight, preferably 20 to 25% by weight, more preferably 22% by weight.

In the method of manufacturing the fluorescent mixture, 45 to 50% by weight of SCA, 29 to 33% by weight of YOX, and 20 to 26% by weight of CMZ are prepared and formed by mixing using a stirrer, a circulator, or the like. Can be.

Display

1 is an exploded perspective view illustrating a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the display device includes a backlight assembly 800, a mold frame 500, and a liquid crystal display panel 600.

The backlight assembly 800 includes a storage container 100, a light source module 200, a light guide plate 300, and a reflection plate 400, and the liquid crystal display panel 600 through an opening formed in the mold frame 500. Light).

The storage container 100 includes a bottom plate 110 and sidewalls 120 protruding from the edge of the bottom plate 110 to form a storage space.

The light source module 200 is accommodated adjacent to the side wall 120 in the storage space of the storage container 100.

The light source module 200 includes a cold cathode ray tube fluorescent lamp 210, a lamp cover 220, and a lamp wire 230.

FIG. 2 is a cross-sectional view illustrating a cold cathode fluorescent lamp (CCFL) shown in FIG. 1.

Referring to FIG. 2, the cold cathode ray tube fluorescent lamp 210 includes a discharge electrode 211, a lamp body 213, a fluorescent layer 215, and a protective layer 217.

In the present embodiment, the lamp body 213 includes a glass tube extending in the axial direction, to form a discharge space 212 therein. The discharge gas is filled in the discharge space 212. For example, the discharge gas includes mercury, argon, or the like.

The discharge electrode 211 is disposed at an end of the discharge space 212 and protrudes out of the lamp body 213.

When a discharge voltage is applied to the discharge electrode 211, discharge is generated in the discharge space 212 to generate excitons from the discharge gas.

Ultraviolet rays are generated in the discharge space by the excitons. The ultraviolet rays are irradiated onto the fluorescent layer 215, and visible light is generated from the fluorescent layer 215.

The fluorescent layer 215 includes a fluorescent mixture. The fluorescent mixture includes 45 to 50 wt% red phosphor, 29 to 33 wt% blue phosphor, and 20 to 26 wt% green phosphor. In the present embodiment, the red phosphor includes (Sr, Ca, Ba, Mg) ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ (SCA), and the blue phosphor is Y ₂ O ₃ : Eu ³⁺ (YOX), wherein the green phosphor includes (Ce, Mg, Zn) Al ₁₁ O ₁₉ : Mn ²⁺ (CMZ).

For example, the fluorescent layer 215 may be formed by coating the fluorescent mixture on the inner surface of the lamp body 213.

The protective layer 217 is formed on the fluorescent layer 215 to protect the fluorescent layer 215. For example, the mercury molecules in the discharge gas are prevented from adhering to the fluorescent layer 215, thereby improving the life of the cold cathode ray tube fluorescent lamp 210.

Referring back to FIG. 1, the lamp cover 220 includes a material having a high reflectance and surrounds the cold cathode ray tube fluorescent lamp 210 to reflect light generated from the cold cathode ray tube fluorescent lamp 210. Reflect toward (300).

The lamp wire 230 is electrically connected to the discharge electrode 211 of the cold cathode ray tube fluorescent lamp 210 to transmit the discharge voltage.

In this embodiment, the light source module 200 includes a side light guide type light source module disposed on the side surface of the light guide plate 300. In this case, the light source module 200 may include a direct type light source module including a plurality of cold cathode ray fluorescent lamps arranged in parallel with each other.

The light guide plate 300 is disposed in the accommodation space of the storage container 100, and the light source module 200 is disposed on the side surface of the light guide plate 300. The light guide plate 300 converts linear light generated by the light source module 200 into planar light and guides the light to the liquid crystal display panel 600.

The reflective plate 400 is disposed under the light guide plate 300 to reflect the light leaking toward the lower side of the light guide plate 300 upward.

The mold frame 500 is disposed on an edge of the light guide plate 300 and includes a sidewall 520 and a stepped part 510.

The liquid crystal display panel 600 is disposed on the stepped portion 510 of the mold frame 500, and displays an image using light emitted from the light guide plate 300. In this case, an electrophoretic display panel may be used instead of the liquid crystal display panel 600.

According to the present embodiment as described above, the fluorescent layer 215 includes the fluorescent mixture, so that the color reproducibility of the cold cathode ray tube fluorescent lamp 210 is improved, thereby improving the image quality of the display device.

3 is an exploded perspective view illustrating a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the display device includes a backlight assembly 850 and a liquid crystal display panel 600.

The backlight assembly 850 includes a storage container 100, a side mold 450, and a plurality of external electrode fluorescent lamps 710.

The storage container 100 includes a bottom plate 110 and a side wall 120 protruding from an edge of the bottom plate 110 to form a storage space.

The external electrode fluorescent lamps 710 are arranged in parallel to each other in the storage space of the storage container 100.

4 is a cross-sectional view illustrating the external electrode fluorescent lamp shown in FIG. 3. In the present embodiment, the remaining components except for the discharge electrode 711 is the same as the cold cathode tube fluorescent lamp shown in Fig. 2 and the description thereof will be omitted.

Referring to FIG. 4, the external electrode fluorescent lamp 710 includes a discharge electrode 711, a lamp body 713, a fluorescent layer 715, and a protective layer 717.

The discharge electrode 711 is disposed on an end of the lamp body 713 and covers the outer surface of the lamp body 713.

In the present embodiment, the external electrode fluorescent lamp 710 is arranged in parallel with each other to form a direct type light source module.

Referring to FIG. 3 again, the side mold 450 is disposed adjacent to both sides of the storage space of the storage container 100, and the ends of the external electrode fluorescent lamps 710 are fixed to the storage container 100. do.

The optical member 350 is disposed on the side mold 450 to improve characteristics of light generated by the external electrode fluorescent lamp 710. In the present embodiment, the optical member 350 includes a diffusion plate 310 and an optical sheet 320.

The diffusion plate 310 is supported by the side mold 450 and diffuses the light generated by the external electrode fluorescent lamp 710 to improve luminance uniformity.

The optical sheet 320 is disposed on the diffusion plate 310 and includes a prism sheet, a diffusion sheet, and the like. The prism sheet improves the front luminance of the light transmitted through the diffusion plate 310.

The liquid crystal display panel 600 is disposed on the backlight assembly 850 and includes an array substrate 610, an opposing substrate 620, a liquid crystal layer 630, an integrated printed circuit board 640, and a flexible circuit board 650. ).

The liquid crystal layer 630 disposed between the array substrate 610 and the opposing substrate 620 may receive light by an image signal applied through the integrated printed circuit board 640 and the flexible printed circuit board 650. The transmittance is changed. Light generated by the backlight assembly 850 passes through the liquid crystal layer 630 in which the light transmittance is changed to display an image.

In the present exemplary embodiment, the display device may further include a top chassis 150 that fixes the liquid crystal display panel 600 to the backlight assembly 850.

According to the present embodiment as described above, the discharge electrode 711 is formed on the outside of the lamp body 713, the assembly of the external electrode fluorescent lamp 710 is improved.

Example 1

In order to manufacture a fluorescent lamp, the fluorescent mixture was coated on the inner surface of the lamp body to form a fluorescent layer. Since the fluorescent lamp is the same as the fluorescent lamp 210 shown in FIG. 2, redundant description thereof will be omitted.

The fluorescent mixture was prepared by mixing 47 wt% SCA as a red phosphor, 31 wt% YOX as a blue phosphor, and 22 wt% CMZ as a green phosphor.

In this embodiment, the fluorescent mixture mixed in powder form was coated on the inner surface of the lamp body (215 of FIG. 2) using an adhesive binder.

Example 2

To prepare the fluorescent mixture, 48 wt% SCA, 29 wt% YOX and 22 wt% CMZ were mixed.

Example 3

To prepare the fluorescence mixture, 45 wt% SCA, 29 wt% YOX and 26 wt% CMZ were mixed.

Comparative example

In order to manufacture a fluorescent lamp, the fluorescent mixture was coated on the inner surface of the lamp body to form a fluorescent layer. Since the fluorescent lamp is the same as the fluorescent lamp 210 shown in FIG. 2, redundant description thereof will be omitted.

The fluorescent mixture is prepared by mixing 47.5 g of SCA as a red fluorescent substance, 31.2 g of YOX as a blue fluorescent substance and 21.3 g of BaMgAl ₁₀ O ₁₇ : Eu ²⁺ as a green fluorescent substance, Mn ²⁺ (BAM: Mn) It was.

Luminous Characteristic Experiment

5 is a graph showing the light emission characteristics of each fluorescent material applied to the fluorescent mixture according to an embodiment of the present invention.

Referring to FIG. 5, the light a generated by the SCA-coated fluorescent lamp had a maximum peak at 445 nm and exhibited a gently distributed spectrum in the red wavelength region.

Light b generated by YOX-coated fluorescent lamps had a maximum peak at 612 nm, exhibited a spectrum focused on the maximum peak, and showed a number of peaks irregularly distributed within the blue wavelength region.

The light c generated by the CMZ-coated fluorescent lamp had a maximum peak at 517 nm and exhibited a gently distributed spectrum in the green wavelength region.

Light (h) generated by the mercury gas injected into the discharge space of the fluorescent lamp had a maximum peak in the blue light region 610 nm, a second peak in the red light region 436 nm, and a third peak in the green light region 546 nm. Spectrum was shown.

6 is a graph showing the light emission characteristics of the fluorescent mixture produced by mixing the fluorescent material shown in FIG. In FIG. 6, the fluorescent mixture was formed by mixing 47.9 g of SCA, 31.2 g of YOX and 22.4 g of CMZ, and coated on the inner surface of the lamp body using a binder.

Referring to FIG. 6, the spectrum of the light generated by the fluorescent mixture showed a peak of intensity of 152382 au at a wavelength of 436 nm, an intensity of 102015 au at a wavelength of 445 nm, and 46588 at a wavelength of 517 nm. The intensity peak of au is shown, the intensity peak of 54828 au is shown at the wavelength of 546 nm, and the intensity peak of 158600 au is shown at the wavelength of 612 nm.

In the spectrum, the wavelength of 436 nm and the wavelength of 445 nm were in the range of red light, the wavelength of 517 nm and the wavelength of 546 nm were in the range of green light, and the wavelength of 612 nm was in the range of blue light.

In this spectrum, the wavelength of 445 nm represented the component of light generated by SCA (FIG. 5 a), and the wavelength of 517 nm represented the component of light generated by CMZ (FIG. 5 c), The wavelength represented the component of light generated by YOX (b of FIG. 5), and the wavelength of 436 nm and the wavelength of 546 nm represented the component of light (h of FIG. 5) generated by mercury gas.

The ratio of the intensity at the wavelength of 445 nm, the intensity at the wavelength of 517 nm, and the intensity at the wavelength of 612 nm was 1: 0.46: 1.55. In another embodiment, the ratio of the intensity at the wavelength of 445 nm to the intensity at the wavelength of 517 nm ranges from 1: 0.4 to 1: 0.5, and the ratio of the intensity at the wavelength of 445 nm to the intensity at a wavelength of 612 nm is 1. It may have a range of: 1.50 to 1: 1.60.

FIG. 7 is a graph showing light emission characteristics of red light generated by passing light having a spectrum shown in FIG. 6 through a red color filter.

Referring to FIG. 7, in the spectrum of light passing through the red color filter, a wavelength of 436 nm showed an intensity of 107261 a.u., and a wavelength of 445 nm showed an intensity of 77811 a.u. Additionally, a peak of 10187 a.u. was shown at 513 nm, the wavelength adjacent to green light. In this embodiment, in the spectrum of the light passing through the red color filter, the intensity at the wavelength of 445 nm and the intensity at the wavelength of 513 nm have a ratio of 1: 0.131. In another embodiment, the intensity at the wavelength of 445 nm and the intensity at the wavelength of 513 nm of the light passing through the red color filter may have a ratio of 1: 0.13 to 1: 0.14.

FIG. 8 is a graph showing light emission characteristics of green light generated by passing light having a spectrum shown in FIG. 6 through a green color filter.

Referring to FIG. 8, in the spectrum of light passing through the green color filter, a wavelength of 517 nm showed an intensity of 38810 a.u., and a wavelength of 546 nm showed an intensity of 44865 a.u.

FIG. 9 is a graph showing light emission characteristics of blue light generated by passing light having a spectrum shown in FIG. 6 through a blue color filter.

Referring to FIG. 9, in the spectrum of the light passing through the blue color filter, the wavelength of 612 nm showed the intensity of 137212 a.u.

Table 1 shows the color coordinates of the light generated by the fluorescent mixture according to the embodiment of the present invention. In Table 1, the fluorescent mixture of Example 1 containing SCA, YOX and CMZ and the fluorescent mixture of Comparative Example containing SCA, YOX and BAM: Mn were used.

TABLE 1

FIG. 10 is a graph showing a light having a spectrum shown in FIG. 6 and a light according to a comparative example of the present invention in a CIE1931 color coordinate system.

Referring to Figure 10 and [Table 1], the color reproducibility (a) of the red light, blue light and green light produced by the fluorescent mixture containing SCA, YOX and CMZ in the fluorescent mixture comprising SCA, YOX and BAM: Mn The color reproducibility (b) of red light, blue light and green light produced by the same was similar.

When using CMZ as a green fluorescent material (a), the color coordinates of the red light, the green light and the blue light are (0.6494, 0.3267), (0.1501, 0.0650) and (0.2311, 0.6773) based on the CIE1931 color coordinate system (c), respectively. ) In another embodiment, the color coordinates of the red light may be (0.64, 0.32) to (0.65, 0.33) based on the CIE1931 color coordinate system (c), and the color coordinates of the green light may be based on the CIE1931 color coordinate system (c) (0.15). , 0.06) to (0.16, 0.07), and the color coordinates of the blue light may be (0.23, 0.67) to (0.24, 0.68) based on the CIE1931 color coordinate system (c).

Table 2 shows luminance, color reproducibility and white coordinates of the fluorescent mixture disclosed in Table 1 above. The luminance of Table 2 is based on the light according to the comparative example, and the white color coordinate is the color coordinate of the white light generated by mixing the red light, the green light and the blue light generated using the fluorescent mixture.

TABLE 2

Referring to Table 2, the color coordinates of the white light were (0.2949, 0.2924) in the fluorescent mixture including SCA, YOX and CMZ. In the case of using CMZ as the green phosphor, the luminance was slightly decreased, but the color reproducibility and the white color coordinate were similar compared to the case of using BAM: Mn as the green phosphor. In another embodiment, when the CMZ is used as the green fluorescent material, the color coordinates of the white light may be (0.29, 0.29) to (0.30, 0.30).

According to such a fluorescent mixture for a fluorescent lamp, a fluorescent lamp having the same, and a display device having the same, color purity of a phosphor generating green is improved by using CMZ as a green fluorescent material. In addition, the disturbance between the green light and the blue light or the red light and the green light having similar wavelength range is reduced, thereby improving the color purity of the red light, the green light and the blue light. Thus, color reproducibility and image quality of the display device are improved.

In the detailed description of the present invention described above with reference to the preferred embodiments of the present invention, those skilled in the art or those skilled in the art having ordinary skill in the art will be described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

1 is an exploded perspective view illustrating a display device according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a cold cathode fluorescent lamp (CCFL) shown in FIG. 1.

3 is an exploded perspective view illustrating a display device according to an exemplary embodiment of the present invention.

4 is a cross-sectional view illustrating the external electrode fluorescent lamp shown in FIG. 3.

5 is a graph showing the light emission characteristics of each fluorescent material applied to the fluorescent mixture according to an embodiment of the present invention.

6 is a graph showing the light emission characteristics of the fluorescent mixture produced by mixing the fluorescent material shown in FIG.

FIG. 7 is a graph showing light emission characteristics of red light generated by passing light having a spectrum shown in FIG. 6 through a red color filter.

FIG. 8 is a graph showing light emission characteristics of green light generated by passing light having a spectrum shown in FIG. 6 through a green color filter.

FIG. 9 is a graph showing light emission characteristics of blue light generated by passing light having a spectrum shown in FIG. 6 through a blue color filter.

FIG. 10 is a graph showing a light having a spectrum shown in FIG. 6 and a light according to a comparative example of the present invention in a CIE1931 color coordinate system.

       <Explanation of symbols for the main parts of the drawings>

100: storage container 110: bottom plate

120: side wall 150: top chassis

200: light source module 210, 710: cold cathode ray tube fluorescent lamp

211, 711: discharge electrode 212, 712: discharge space

213, 713: lamp body 215, 715: fluorescent layer

217, 717: protective layer 220: lamp cover

230: lamp wire 300: light guide plate

310: diffuser plate 320: optical sheet

350: optical member 400: reflector

450: side mold 500: mold frame

520: side wall 510: step

600: liquid crystal display panel 610: array substrate

620: opposing substrate 630: liquid crystal layer

640: integrated printed circuit board 650: flexible circuit board

800, 850: backlight assembly

Claims (17)

(Sr, Ca, Ba, Mg) 5 (PO 4) 3 Cl: Eu 2+ (SCA); Y ₂ O ₃ : Eu ³⁺ (YOX); And Fluorescent mixture comprising (Ce, Mg, Zn) Al ₁₁ O ₁₉ : Mn ²⁺ (CMZ). According to claim 1, wherein the content of the SCA is 45 to 50% by weight, the content of the YOX is 29 to 33% by weight, the content of the CMZ fluorescent mixture, characterized in that 20 to 26% by weight. The fluorescent mixture of claim 2 wherein the fluorescent mixture comprises 47 wt% SCA, 31 wt% YOX, and 22 wt% CMZ. A lamp body in which a discharge space in which ultraviolet rays are generated is formed; (Sr, Ca, Ba, Mg ) 5 (PO 4) 3 Cl: Eu 2 + (SCA) ^{_{and, Y 2 O 3: Eu 3}} + (YOX) and, (Ce, Mg, Zn) Al 11 O 19: A fluorescent layer comprising a fluorescent mixture including Mn ²⁺ (CMZ) and formed on an inner wall of the lamp body to convert the ultraviolet light into visible light; And And a discharge electrode disposed at an end of the lamp body to apply a voltage to the discharge space. The fluorescent lamp of claim 4, wherein the visible light spectrum has a ratio of an intensity at a wavelength of 445 nm and an intensity at a wavelength of 517 nm from 1: 0.40 to 1: 0.50. 6. The fluorescent lamp of claim 5, wherein the spectrum of the visible light has a ratio of an intensity at a wavelength of 445 nm and an intensity at a wavelength of 612 nm of 1: 1.50 to 1: 1.60. The fluorescent lamp of claim 6, wherein the spectrum of visible light has a ratio of an intensity at a wavelength of 445 nm, an intensity at a wavelength of 517 nm, and an intensity at a wavelength of 612 nm of 1: 0.46: 1.55. The fluorescent lamp of claim 4, wherein the fluorescent mixture comprises 45 to 50 wt% SCA, 29 to 33 wt% YOX, and 20 to 26 wt% CMZ. The fluorescent lamp of claim 8, wherein the fluorescent mixture comprises 47 wt% SCA, 31 wt% YOX, and 22 wt% CMZ. A lamp body in which a discharge space in which ultraviolet rays are generated is formed; 45-50% by weight of (Sr, Ca, Ba, Mg) ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ (SCA), 29-33% by weight of Y ₂ O ₃ : Eu ³⁺ (YOX), 20 to 26% by weight of a fluorescent mixture comprising (Ce, Mg, Zn) Al ₁₁ O ₁₉ : Mn ²⁺ (CMZ), formed on the inner wall of the lamp body to convert the ultraviolet light into visible light layer; And a discharge electrode disposed at an end of the lamp body and configured to apply a voltage to the discharge space. An optical member disposed on the fluorescent lamp to improve optical characteristics of visible light generated by the fluorescent lamp; And And a display panel disposed on the optical member and displaying an image including a plurality of color filters through which light provided from the optical member is transmitted. The display device according to claim 10, wherein the spectrum of visible light has a ratio of an intensity at a wavelength of 445 nm and an intensity at a wavelength of 517 nm of 1: 0.40 to 1: 0.50. The display device according to claim 10, wherein the spectrum of the visible light has a ratio of an intensity at a wavelength of 445 nm and an intensity at a wavelength of 612 nm of 1: 1.50 to 1: 1.60. The display device of claim 10, wherein the spectrum of the visible light has a ratio of an intensity at a wavelength of 445 nm, an intensity at a wavelength of 517 nm, and an intensity at a wavelength of 612 nm of 1: 0.46: 1.55. The display device of claim 10, wherein the color filters include a red color filter that generates red light, a green color filter that generates green light, and a blue color filter that generates blue light. 15. The display device according to claim 14, wherein the intensity at the wavelength of 445 nm of the red light passing through the red color filter and the intensity at the wavelength of 513 nm have a ratio of 1: 0.13 to 1: 0.14. The display device according to claim 14, wherein the color coordinates of the blue light are from (0.23, 0.67) to (0.24, 0.68) based on the CIE1931 color coordinate system. The display device according to claim 14, wherein the color coordinates of the white light generated by mixing the red light, the green light and the blue light are (0.29, 0.29) to (0.30, 0.30) based on the CIE1931 color coordinate system.

Images