KR20020068552A - Method for supplying the light to liquid crystal display panel assembly and device for embody thereof and liquid crystal display device contain thereof - Google Patents

Abstract

PURPOSE: A device and a method for supplying light to an LCD panel assembly and an LCD including the device are provided to prevent the decrease of driving frequency generated by the rising of a charging voltage and resolve the uneven luminance. CONSTITUTION: A method for supplying light to an LCD panel assembly includes the steps of supplying primary light including discontinuous light distribution sections by mounting at least one or more row of at least more than one lamps(451) facing to each other at ends, supplying secondary light by processing the primary light to have continuous light distribution, and supplying the secondary light to the LCD panel assembly, wherein the secondary light is generated by a diffusion plate(441) which diffuses light.

Description

Method for supplying the light to liquid crystal display panel assembly and device for embody approximately and liquid crystal display device contain

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of liquid crystal displays, and more particularly, to a light supply method for a suitable liquid crystal display panel assembly as the liquid crystal display device becomes larger, a light supply device for implementing the same, and a liquid crystal display device including the same.

In general, a liquid crystal display device is one of display devices that display an image by actively utilizing an optical shutter characteristic of a liquid crystal whose light transmittance is changed according to the arrangement as well as the arrangement depending on the electric field.

Such a liquid crystal display device is significantly smaller in volume and weight than a CRT-type display device (Cathod Ray Tube type display device), the resolution is almost the same as the situation is attracting attention as the next generation display device.

The liquid crystal display device having such various advantages cannot display normally in the absence of light due to the liquid crystal characteristics.

For this reason, the liquid crystal display device must obtain the light necessary for the display by using external light for the display or consuming electric energy charged in the liquid crystal display device and itself.

In particular, in the case of a liquid crystal display device using light generated by consuming charged electrical energy, a cold cathode ray tube lamp having a long length and a small diameter as well as a white light and a very long time of use is very suitable.

However, in recent years, as the liquid crystal display device becomes larger than the CRT display device, for example, at least 17 ″ or more, it is increasingly difficult to apply the cold cathode ray tube lamp.

Thereof causes include a liquid crystal display device is enlarged the more cold cathode fluorescent tube lamps (1, 3) In addition, no choice but to lengthen the length in W ₂ from W _1, the length increase of the cold cathode fluorescent tube lamp 3 as shown in Figure 1 In order to light up, a higher discharge voltage must be applied.

Specifically, referring to FIG. 2, in order to apply a higher discharge voltage to the elongated cold cathode ray tube lamp 3, the secondary coil N of the inverter 4 applying a power required to the cold cathode ray tube lamp 3. ₂ ) the inductance L ₂ must be increased in proportion to the length of the cold cathode ray lamp 3,

According to <Equation 1>,

When the inductance L ₂ is increased, the driving frequency that determines the number of flashes per second of the cold cathode ray tube lamp 3 is reduced in inverse proportion to the inductance L ₂ .

When the length of the cold cathode ray tube lamp 3 is excessively increased by excessively increasing the discharge voltage while neglecting to decrease the driving frequency, the flashing frequency f of the cold cathode ray tube lamp 3 is lowered. This in turn causes display performance degradation.

Another problem is that when the length of the cold cathode ray tube lamp 3 is increased, the movement of electrons and mercury injected into the inside of the cold cathode ray tube lamp 3 is not active, so that the dark portion of the cold cathode ray tube lamp 3 is dark. Another problem is that the part occurs.

Accordingly, an object of the present invention is to account for such a conventional problem, and the object of the light supply method to the liquid crystal display device according to the present invention is that the light supply can be performed uniformly even if the area to be displayed by the liquid crystal display device is increased. It is in such a way.

In addition, an object of the light supply device for supplying light to the liquid crystal display device according to the present invention is to ensure that even light is always supplied to the liquid crystal display device even when a large screen display is performed using a lamp having a limited length. .

In addition, an object of the liquid crystal display device according to the present invention is to enable a high-definition display even in a large screen liquid crystal display device.

1 is a plan view illustrating a lamp for a liquid crystal display device having a different length in the related art.

2 is a conceptual diagram illustrating a conventional lamp inverter and a lamp.

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

4 is a perspective view showing a diffusion plate that is part of a light supply device according to an embodiment of the present invention.

5 is a plan view of a lamp group according to another embodiment of the present invention.

Such a light supply method to a liquid crystal display panel for realizing the object of the present invention is to provide a liquid crystal display panel assembly having a display area larger than the light supply area supplied from the lamp having a maximum length required to generate a specified lamp driving frequency A method of supplying a light source, the method comprising: combining a lamp generating at least one lamp driving frequency, and distributing primary light having a discontinuous light distribution section in a portion over an area corresponding to a display area of a liquid crystal display panel assembly; Supplying, processing the light distribution of the portion having the discontinuous light distribution among the supplied first light to be continuous to supply the secondary light having the uniform light distribution, and the secondary light to the liquid crystal display panel assembly. Supplying.

In addition, the light supply device for realizing the object of the present invention is a light supply for supplying light to the liquid crystal display panel assembly having a display area larger than the light supply area supplied from the lamp having the maximum length necessary to generate a specified lamp drive frequency In the apparatus, the lamp generating the specified lamp driving frequency is shorter than the length of one side of the liquid crystal display panel assembly and is installed so that at least two or more adjacently adjacent to each other, so that the primary light having a discontinuous light distribution section in a portion of the liquid crystal display A lamp group to be supplied over the entire surface of the display panel assembly, and a diffusion plate formed on an upper surface of the lamp group and having a light diffusion means formed on a portion having a discontinuous light distribution in the first light, and a storage container for fixing the lamp group and the diffusion plate. It includes.

In addition, a liquid crystal display device for realizing the object of the present invention is a liquid crystal display panel assembly and at least two or more lamps to control the liquid crystal so that the image can be displayed by changing the light transmittance at one side length of the liquid crystal display panel assembly Light supply including a lamp group arranged to be included in succession, a diffuser plate for ensuring a uniform light distribution of non-uniform light distribution generated in adjacent parts of the lamps included in the lamp group, a light supply including a lamp group and a receiving container for fixing the diffuser plate Device.

Hereinafter, a light supply method to a liquid crystal display panel, a light supply device for implementing the same, and a liquid crystal display device including the same according to an exemplary embodiment for implementing the object of the present invention as described above will be described. same.

After the light supply method to the liquid crystal display panel according to an embodiment of the present invention first described, the light supply device and the liquid crystal display device according to an embodiment of the present invention will be described.

In the method of supplying light to a liquid crystal display panel according to an embodiment of the present invention, the size of the liquid crystal display panel is gradually increased, but the length of the cold cathode ray tube lamp supplying light to the enlarged liquid crystal display panel increases and discharges the voltage. It can be applied when it cannot be sufficiently long due to constraints such as frequency reduction.

The light supply method in which the display performance is not deteriorated despite the limitation of the length of the cold cathode ray tube is described in more detail as follows.

First, in order to supply light to the liquid crystal display panel assembly, the step of generating the first light to be displayed from the cold cathode ray tube lamp must be preceded. At this time, the length of the cold cathode ray tube lamp that generates the first light is limited to have a maximum length or less that does not lower the designated drive frequency.

At this time, if the display area of the liquid crystal display panel assembly is larger than the light supply area provided by the limited cold cathode ray tube lamp to maintain the driving frequency, a portion of the liquid crystal display panel assembly may not necessarily reach the first light. In one embodiment of the present invention, the short cold cathode ray tube lamps are arranged successively in a matrix manner below the liquid crystal display panel assembly.

The light generated while satisfying the specified driving frequency in the cold cathode ray tube lamps arranged successively in a matrix manner has a discontinuous light distribution as compared with the light generated in one cold cathode ray tube lamp. Such discontinuous light distribution occurs especially between any one lamp and adjacent lamps.

Thereafter, the light having such a discontinuous light distribution is introduced into the first light diffusing member located at a predetermined distance from the cold cathode ray tube lamp.

At this time, in order to make uniform the light incident to the first light diffusing member with the discontinuous light distribution, the step of uniformly processing the incident discontinuous light distribution is performed in the first light diffusing member, which is the first light diffusing member. This is done by surface treatment where light is continuously incident.

Subsequently, after the non-uniform light generated in the cold cathode ray tube lamp is uniformly processed from the first light diffusing member, the treated secondary light is introduced again to the second light diffusing member located on the upper surface of the first light diffusing member, and then again. The step of processing uniformly is performed.

Thereafter, the light uniformly processed while passing through the second light diffusing member reaches the liquid crystal display panel assembly.

Hereinafter, one embodiment of various light supply apparatuses for implementing a method for supplying light to a liquid crystal display panel assembly according to an exemplary embodiment of the present invention described above will be described with reference to FIG. 3.

The light supply device 400 according to the present invention generally includes a storage container 410, a lamp group 450, and a light diffusing member 441.

First, the storage container 410 is a hexahedral shape with an upper surface opened in one embodiment, preferably made of a material having a high thermal conductivity such as aluminum alloy, the area of the storage container 410 will be described later in detail the liquid crystal display panel To have a size equivalent to the assembly 200.

The lamp group 450 is installed on the inner bottom surface 420 of the storage container 410.

The lamp group 450 is composed of a plurality of cold cathode ray tube lamps 451. At this time, each lamp 451 is provided at one end of the lamp body 451a, the lamp body 451a into which mercury is injected, and the other end of the first electrode 451b and the lamp body 451a to which the first voltage is applied. And a second electrode 451c provided at the high voltage higher than the first voltage.

The cold cathode ray tube lamp 451 having such a structure has at least two rows or more in one column or more, that is, a matrix form.

As described above, the installation of the cold cathode ray tube lamp 451 is related to the light supply method described in detail above, and thus the installation of the cold cathode ray tube lamp 451 in the matrix form is the display area of the LCD panel assembly 200. This is to prevent a decrease in the driving frequency of the cold cathode ray tube lamp 451 even if this increases.

However, when the cold cathode ray tube lamp 451 is formed in the matrix form, a portion where light is discontinuously generated is formed at the bottom of the liquid crystal display panel assembly 200.

In particular, there is a discontinuous light distribution between the end of one lamp 451 and the end of another lamp subsequently installed, such a distribution of discontinuous light causes display performance degradation.

Therefore, the light diffusion member 441 is required to display the large liquid crystal display panel assembly without the lamp driving frequency and the discontinuous light distribution designated at the time of design.

The light diffusing member 441 is composed of a diffusion plate 430 and a diffusion sheet 440 again.

The diffusion plate 430 is mounted on the upper surface of the cold cathode ray tube lamp 451 via the storage container 410 to serve to uniformly distribute the light generated by the cold cathode ray tube lamp 451.

In this case, in order to overcome the discontinuous light distribution described above, a separate light diffusion pattern 435 is formed in the diffusion plate 430 as shown in FIG. 4.

As the light diffusion pattern 435, it is preferable to use hemispherical dots or the like for inducing light scattering.

On the other hand, the light passing through the diffusion plate 430 passes through the diffusion sheet 440 having a thin sheet shape and the light distribution is processed once again to be uniform, and then enters the liquid crystal display panel assembly 200.

In this case, the diffusion sheet 440 of the light diffusing member 441 may not be necessary and may be selectively used.

Through this process, the light generated by the light supply device 400 is supplied to the liquid crystal display panel assembly 200.

First, the liquid crystal display panel assembly 200 is composed of a liquid crystal display panel 210, a flexible printed circuit (FPC) 220, 230, 240, and a printed circuit board 250, 260.

In detail, the liquid crystal display panel 210 is formed of a TFT substrate 211, a color filter substrate 213, and a liquid crystal (not shown).

More specifically, the TFT substrate 211 is a TFT (not shown) formed in a matrix form suitable for resolution by a semiconductor thin film process on one side of the transparent substrate, is produced during the manufacturing of the TFT in a matrix form, any of the TFTs A gate line (not shown) commonly connected with the gate electrodes (not shown) of the TFTs belonging to one column of the source, the source electrodes of the TFTs belonging to any one row of the TFTs arranged in a matrix form; A pixel electrode (not shown) is formed to be electrically connected to a commonly connected data line (not shown) and a drain electrode (not shown) of each TFT, and the pixel electrode is mainly transparent indium tin oxide (ITO). It consists of.

In this case, the gate line and the data line described above are orthogonal to each other so as not to be shorted, and extend to an end portion of the transparent substrate.

Meanwhile, in the color filter substrate 213, an RGB pixel is formed by a semiconductor manufacturing process so as to correspond to each pixel electrode, and a common electrode (not shown) is formed of indium tin oxide material over the entire surface of the color filter substrate 213. .

Subsequently, the TFT substrate 211 and the color filter substrate 213 are mutually sealed by a sealant after spacers are distributed in the state where each RGB pixel and the pixel electrode are correctly aligned, and then the TFT substrate 211 and the color filter substrate Liquid crystal is injected between 213 so that it may become a uniform thickness about 5 micrometers.

The gate driving signal and the timing signal applied from the printed circuit board 260 to be described later are applied to the gate line of the TFT substrate 211 of the TFT substrate 211 of the liquid crystal display panel 210 having the above configuration. One end of the plurality of gate flexible printed circuits 230 to be applied is attached via an anisotropic conductive film (ACF) or the like, and a data driving signal and timing applied from the printed circuit board 250 to an end of the data line. One end of the plurality of data flexible printed circuits 220 for causing a signal to be applied to the data line of the TFT substrate 211 is also attached via an anisotropic conductive film or the like.

Meanwhile, printed circuit boards 250 and 260 are installed at the other ends of the gate and data flexible printed circuits 230 and 220. The printed circuit boards 250 and 260 are equipped with various modules for applying driving signals and generating timing signals. The printed circuit boards 250 and 260 receive image data from an external information processing device (not shown).

Subsequently, the printed circuit boards 250 and 260 are bent to the rear surface of the liquid crystal display panel 210, thereby greatly reducing the overall planar area of the liquid crystal display device 500.

The liquid crystal display panel assembly 200 is driven in units of lines by an image data signal and a timing signal processed by an information processing apparatus (not shown).

In detail, the gate driving signal higher than the threshold voltage of the TFT is timing in the gate line while the image data signal already processed by the printed circuit board 250 is sequentially loaded on each data line. By being input in accordance with the signal, the gate driving signal turns on all the TFTs in any one row so that all the TFTs in any one row are turned on, so that the image data signal applied to each data line is converted into the TFTs. The pixel electrode is applied to the pixel electrode via the source electrode, the channel layer, and the drain electrode, thereby causing an electric field change between the pixel electrode and the common electrode.

As such, when an electric field change occurs between the pixel electrode and the common electrode, the alignment angle of the liquid crystal is inevitably changed in response to the electric field change, and eventually, the light incident by the light supply device described above passes through the color filter substrate. Eventually, the eyes of the user are reached.

Reference numeral 300 denotes a middle chassis for coupling the light supply device and the liquid crystal display panel assembly 200 to each other, and reference numeral 100 denotes the liquid crystal display panel assembly 200, the middle chassis 300, and the light supply device ( 400 is a top chassis 100 that couples each other.

Meanwhile, another attached embodiment of the light supply device according to the present invention is shown in FIG. 5, and the plurality of lamps are arranged in the storage container 410 of the light supply device 400 to be at least two rows and one column or more. In the state in which the lamps 453 in one row and the lamps 455 in adjacent rows are staggered with each other, the lamps 455 in another row have a predetermined length between the lamps 453 in one row. Even if overlapped, the same or more improved effects as in the above-described embodiment can be obtained.

As described in detail above, a large screen liquid crystal display is provided by solving the discharge voltage which is increased as the length of the cold cathode ray tube lamp increases and the luminance unevenness that may occur incidentally, while preventing the lowering of the driving frequency caused by the increase of the discharge voltage. The device can be implemented.

In the detailed description of the present invention described above with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge in the scope of the invention 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.

Claims (12)

Supplying primary light including a discontinuous light distribution section by installing at least one row in a row so that ends of the at least one lamps face each other; Supplying processed secondary light such that the light distribution of the supplied primary light has a continuous light distribution; And And supplying the secondary light to the liquid crystal display panel assembly. The method of claim 1, wherein the secondary light is generated by a diffusion plate for diffusing light. The method of claim 1, wherein the secondary light is generated by arranging the lamps alternately and overlapping each other with a predetermined length. The method of claim 1, wherein the lengths of the lamps have a length less than or equal to a maximum length required to generate a designated lamp driving frequency. A lamp group shorter than a length of one side of the liquid crystal display panel assembly, and installed such that at least two or more are adjacent to each other so that primary light including a discontinuous light distribution section is supplied over the entire area of the liquid crystal display panel assembly; A diffusion plate disposed on an upper surface of the lamp group and configured to have a light diffusing means formed at a portion having a discontinuous light distribution of the primary light to generate secondary light having a continuous light distribution; And And a storage container for fixing the lamp group and the diffusion plate. 6. The light supplying device according to claim 5, wherein the lamps belonging to the lamp group are arranged alternately and overlap each other by a predetermined length. 6. The light supplying device according to claim 5, wherein the light diffusing means is a light diffusing pattern formed on a diffusion plate corresponding to the lamp and the lamp adjacent to each other. 6. The light supply apparatus of claim 5, wherein a diffusion sheet is further provided on an upper surface of the diffusion plate. 6. The light supplying device of claim 5, wherein the lamps are arranged in two rows at a lower portion of the liquid crystal display panel assembly. 10. The light supplying device of claim 9, wherein a first voltage supplied to an opposing first electrode of the lamps is lower than a second voltage supplied to an opposing second electrode of the lamps. 6. The light supply of claim 5, wherein the length of the lamps is less than or equal to the maximum length required to generate a designated lamp drive frequency. A liquid crystal display panel assembly for controlling an liquid crystal to change an optical transmittance so that an image can be displayed; And At least two lamps shorter than the length of one side of the liquid crystal display panel assembly have a lamp group in which two or more rows are successively arranged, and an uneven distribution of light generated at adjacent portions of the lamps included in the lamp group. And a light supply device including a diffusion plate, a lamp group, and a storage container to fix the diffusion plate.