KR20070072160A - Fluorescent lamp, backlight unit and liquid crystal display device having same - Google Patents

Abstract

A fluorescent lamp, a back light unit, and an LCD including the same are provided to enhance heat-radiating characteristics by increasing light transmittance to a color filter. A fluorescent lamp includes a lamp body(210) and a color material layer(220). The lamp body is used for receiving a fluorescent material and discharge gas. The color material layer is formed on a surface of the lamp body. The color material layer includes red, green and blue colors. The color material layer is formed of fluorescent materials including the red, green, and blue colors. The color material layer is formed on the surface of the lamp body by using a printing method, a dispensing or spraying method. An ultraviolet shielding layer(230) is formed on an outer surface of the color material layer.

Description

Fluorescent lamp, back light unit and liquid crystal display including the same {Fluorescent lamp, back light unit and LCD including the same}

1 is an explanatory view showing a fluorescent lamp according to an embodiment of the present invention and modifications thereof.

FIG. 2 is a partial cross-sectional view of the fluorescent lamp of FIG. 1.

FIG. 3 is an explanatory diagram schematically illustrating a liquid crystal display device having the fluorescent lamp of FIG. 1.

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

210: lamp body 220: color material layer

230: UV blocking layer 310: liquid crystal display panel

312 lower substrate 314 upper substrate

320: backlight unit 322: lamp

324 lamp housing 326 optical sheet

The present invention relates to a fluorescent lamp, a back light unit (BLU) and a liquid crystal display device having the same, and more particularly, to a fluorescent lamp having improved color reproducibility, and a back light unit and a liquid crystal display device having the same. It is about.

In recent years, liquid crystal displays are spotlighted as display means.

The liquid crystal display performs display functions using the electrical and optical properties of the liquid crystal injected into the panel, and is widely applied to various fields such as computer monitors and mobile communication terminals due to the advantages of small size, light weight, and low power consumption. There is a trend.

Since the liquid crystal display device is not a self-luminous display device but a light receiving type display device, a separate light source such as a back light unit equipped with a lamp is required. That is, by selectively transmitting the light applied from the backlight unit through the liquid crystal display panel, desired image information can be displayed.

As a lamp included in the backlight unit, fluorescent lamps such as CCFL (Cold Cathode Flourscent Lamp) and EEFL (External Electrode Fluorescent Lamp) are mainly used. emitting diode (LED) lamps are increasingly being used.

Although fluorescent lamps have a high competitiveness in terms of manufacturing costs, the representative reasons for the increasing use of LED lamps include differences in color reproducibility and heat generation characteristics. This is because the light applied from the LED lamp has characteristics of wavelength according to each component of red (R), green (G) and blue (B) constituting white light, whereas the light applied from the fluorescent lamp is relatively mixed light. Personality is stronger.

That is, fluorescent lamps have poor color reproducibility because the characteristics of component light according to wavelength are unclear, and light components that do not transmit color filters due to indistinct color reproducibility are converted into heat in the liquid crystal panel. To provide the cause.

Accordingly, there is a demand for development of a fluorescent lamp having improved color reproducibility in order to obtain effects such as improvement in heat generation characteristics and reduction in manufacturing cost of the liquid crystal display.

The present invention has been made in an effort to provide a fluorescent lamp having improved color reproducibility, a backlight unit and a liquid crystal display device having the same.

The technical problem of the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

Fluorescent lamp according to an embodiment of the present invention for achieving the above technical problem is formed on the surface of the lamp body and the lamp body in which the fluorescent material and the discharge gas is contained therein and at least red (R), green (G) ), A color material layer provided with a blue (B) color.

Specific details of other embodiments are included in the detailed description and drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various forms, and the present embodiments are merely provided to make the disclosure of the present invention complete and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, the invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an explanatory view showing a fluorescent lamp according to an embodiment of the present invention and modifications thereof, and FIG. 2 is a partial cross-sectional view thereof.

1 and 2, it can be seen that the fluorescent lamp according to the embodiment of the present invention may include a lamp body 210, a color material layer 220, an ultraviolet blocking layer 230, and the like. .

The lamp body 210 accommodates fluorescent material, discharge gas, and the like, and emits light through discharge of discharge gas by a driving voltage applied through an electrode (not shown), thereby generating and irradiating light. Perform.

The electrode connected to the lamp body 210 may have a different forming area according to the type of fluorescent lamp. As is widely known, in the case of a cold cathode fluorescent lamp (CCFL), the electrode may be formed inside the lamp body 210. In the case of an external electrode fluorescent lamp (EEFL) or the like, an electrode may be formed at an external end or both ends of the lamp body 210.

The color material layer 220 is formed on the outer wall of the lamp body 210 by coloring light transmitting materials having colors of red (R), green (G), and blue (B). Here, the light transmitting material having a color of red (R), green (G), blue (B) may be a fluorescent material, the formation of the color material layer 220 is printing (printing), dispensing (dispensing) Or by various known methods such as spraying.

The color material layer 220 may be arranged in the form of a mosaic method, a stripe method, or a delta method corresponding to the color filter, but is not limited thereto. It may be arranged to have or randomly.

Some exemplary views of the arrangement of the color material layer 220 are illustrated in FIGS. 1A, 1B, and 3C.

The surface of the color material layer 220 may be further provided with a UV blocking layer 230 for blocking ultraviolet (UV) generated from the lamp or the color material layer 220 and the like.

FIG. 3 is an explanatory diagram schematically illustrating a liquid crystal display device having the fluorescent lamp of FIG. 1.

Referring to FIG. 3, the liquid crystal display according to the exemplary embodiment of the present invention includes a liquid crystal display panel 310 and a backlight unit 320.

The liquid crystal display panel 310 includes a lower substrate 312, an upper substrate 314, and a liquid crystal layer (not shown) formed therebetween.

Typically, the lower substrate 312 includes a gate line, a data line, a thin film transistor, a pixel electrode, and the like, and the upper substrate 314 is positioned on the upper side of the lower substrate 312 to face the color filter, the black matrix, and the common electrode. But not shown.

The configuration and operation thereof are briefly described as follows.

First, a plurality of gate lines and data lines are arranged on the lower substrate 312 to have a matrix form of m × n. Thin film transistors, which are switching elements, are formed at intersections of the plurality of gate lines and data lines.

Although not shown in detail, the thin film transistor includes a gate electrode, a source electrode, a drain electrode, an active layer, an ohmic contact layer, and the like, and the drain electrode is connected to the pixel electrode to form a unit pixel. In other words, when the gate signal is applied to the gate electrode through the gate line, the thin film transistor operates to transfer the data signal applied to the data line from the source electrode to the drain electrode through the ohmic contact layer and the active layer.

That is, when a data signal is applied to the source electrode, a voltage corresponding thereto is applied to the pixel electrode connected to the drain electrode, which causes a voltage difference between the pixel electrode and the common electrode. In addition, due to the voltage difference between the pixel electrode and the common electrode, the molecular arrangement of the liquid crystal interposed therebetween changes, and the light transmittance of the pixel changes due to the change in the molecular arrangement of the liquid crystal, thereby causing the data signal applied to each pixel. Depending on the difference, the color difference of the pixel occurs. By using the color difference, the screen of the LCD may be controlled.

The gate signal applied to the gate line and the data signal applied to the data line are generated by an integrated circuit (IC) such as a gate driver and a data driver, respectively, and a TCP (Tape) is formed between the driver IC and the liquid crystal display panel 310. Carrier Package) and the like.

In this case, although the color filter, the common electrode, and the like have been described in the upper substrate 314 in general, the common electrode may be formed on the lower substrate 312 in the case of a horizontal alignment type (IPS mode) liquid crystal display device, In the case of a color-filter on array (COA) structure, a color filter may be formed on the lower substrate 312, which will be apparent to those skilled in the art.

The backlight unit 320 includes a lamp 322, a lamp housing 324, an optical sheet 326, and the like.

The lamp 322 is positioned parallel to each other in the lamp housing 324, and may be an external electrode fluorescent lamp (EEFL) or a cold cathode fluorescent lamp (CCFL) whose electrodes are formed on both ends of the lamp 322 or outside of one end. .

The lamp housing 324 fixes and supports the lamp 322, and in order to reflect the leakage light of the light applied from the lamp 322 to the inner wall adjacent to the lamp 322 to increase the brightness, silver (Ag) and aluminum (Al). ) And a reflecting plate formed of a high reflectance material such as chromium (Cr).

At this time, the lamp 322 provided in the backlight unit 320 according to the embodiment of the present invention, the fluorescent light having a color of red (R), green (G), blue (B) on the surface of the lamp 322 A material layer may be formed.

As a result, the red (R), green (G), and blue (B) component light of the mixed light irradiated from the lamp 322 can be made clear, so that the color reproducibility of the image information displayed through the color filter is greatly increased. Can be improved.

The color material layer on the surface of the lamp 3220 may be formed by various known methods such as printing, dispensing, or spraying, and the UV blocking layer is formed on top of the formed color material layer. And the like can be further formed.

Red (R), green (G), and blue (B) colors formed in the color material layer may be arranged by various methods such as a mosaic method, a stripe method, or a delta method. As mentioned above.

The optical sheet 326 scatters and / or condenses light applied from the lamp 322 to the liquid crystal display panel 310, and includes a plurality of sheets having different functions, such as a prism sheet or a diffusion sheet. It can be configured by.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, the embodiments described above are to be understood in all respects as illustrative and not restrictive.

According to the fluorescent lamp of the present invention as described above, the backlight unit and the liquid crystal display device having the same, the characteristic of each wavelength of the component light of red (R), green (G), and blue (B) of the fluorescent lamp is more obvious. I can lose.

Accordingly, there is an advantage that the color reproducibility of the fluorescent lamp can be greatly improved.

In addition, due to the increased color filter transmittance of the light applied from the fluorescent lamp, not only the heating characteristic of the liquid crystal panel is improved, but also the manufacturing cost of the liquid crystal display device can be reduced compared to the case of using the LED lamp. There is also.

Claims (7)

A lamp body accommodating a fluorescent material and a discharge gas therein; And And a color material layer formed on a surface of the lamp body and provided with at least red (R), green (G), and blue (B) colors. The method of claim 1, The color material layer is a fluorescent lamp, characterized in that formed by a fluorescent material containing red (R), green (G), blue (B) colors. The method of claim 2, The color material layer including the red (R), green (G), and blue (B) fluorescent materials may be applied to the surface of the lamp body by printing, dispensing, or spraying. Fluorescent lamp, characterized in that formed by. The method of claim 3, wherein Fluorescent lamp, characterized in that the UV (UV) blocking layer is formed on the outside of the color material layer. The method of claim 3, wherein Red (R), green (G), blue (B) fluorescent material provided in the color material layer is characterized in that arranged in a mosaic (stripe), stripe (stripe) method or delta (delta) method Fluorescent lamps. The backlight unit provided with the fluorescent lamp of any one of Claims 1-5. A liquid crystal display device comprising the backlight unit according to claim 6.

Images