KR20020075589A - Backlight assembly - Google Patents

Abstract

PURPOSE: A backlight assembly is provided to minimize the length of a conductor film for electrically connecting a liquid crystal display panel to a printed circuit board, thereby reducing the fabrication cost of the backlight assembly. CONSTITUTION: A backlight assembly includes a lamp unit for generating light, a light guide unit(720) mounted with the lamp unit at a side wall and guiding the light from the lamp unit, a receiving container(800) for receiving the lamp unit and the light guide unit, and a display unit received in the receiving container facing the light guide unit to be overlapped with the lamp unit at an end and displaying images in response to the light guided by the light guide unit, a printed circuit board(620) formed with a driving control circuit for controlling the driving of the display unit, and a conductive film(630) for connecting the printed circuit board to the display unit electrically.

Description

Backlight Assembly {BACKLIGHT ASSEMBLY}

The present invention relates to a backlight assembly, and more particularly, to a backlight assembly capable of minimizing a length of a conductive film for electrically connecting a printed circuit board and a display unit.

Recently, information processing devices have been rapidly developed to have various forms, various functions, and faster information processing speed. Information processed in such an information processing device has an electrical signal form. In order for the user to visually check the information processed by the information processing device, a display device serving as an interface is required.

Recently, a liquid crystal display device has been developed, which is lighter, smaller, and has a function such as full-color, high resolution, and the like, compared to a typical CRT display device. As a result, the liquid crystal display device has come to be widely used as a display device of computer monitors, home wall-mounted televisions, and other information processing devices, which are representative information processing devices.

In general, a liquid crystal display device applies a voltage to a specific molecular array of a liquid crystal to convert it into another molecular array, and changes in optical properties such as birefringence, photoreactivity, dichroism, and light scattering characteristics of the liquid crystal cell that emit light by the molecular array conversion. Is a display that displays an image by converting the image into visual change.

In such a liquid crystal display device, in particular, the role and function of the backlight assembly have emerged as an important problem. This is because the size and light efficiency of the liquid crystal display device vary greatly according to the structure of the backlight assembly, and the mechanical and optical characteristics of the overall liquid crystal display device are increased. This is because the property is affected.

1 is an exploded perspective view schematically illustrating a conventional liquid crystal display, and FIG. 2 is a cross-sectional view illustrating a coupling structure of a display unit of the backlight assembly illustrated in FIG. 1.

Referring to FIG. 1, the liquid crystal display device 900 includes a liquid crystal display module for displaying an image by applying an image signal and a case (not shown) for accommodating the liquid crystal display module. The liquid crystal display module includes a display unit 200 including a liquid crystal display panel for displaying a screen.

The display unit 200 includes a liquid crystal display panel 210, a data side printed circuit board 220, a gate side printed circuit board 240, a data side tape carrier package 230, and a gate side tape carrier package 250. do.

The liquid crystal display panel 210 includes a thin film transistor substrate 212 of a transparent glass substrate on which a matrix thin film transistor is formed, and a color filter substrate on which a RGB pixel, which is a color pixel in which a predetermined color is expressed while light passes, is formed by a thin film process. 214 and liquid crystal (not shown).

When the thin film transistor of the above-described thin film transistor substrate 212 is turned on, an electric field is formed between the pixel electrode and the common electrode of the color filter substrate. The light transmittance is changed according to the arrangement angle of the liquid crystal changed by the electric field to obtain a desired pixel.

A driving signal and a timing signal are applied to the gate line and the data line of the thin film transistor in order to control the arrangement angle of the liquid crystals and the timing of the liquid crystals of the liquid crystal display panel 210. That is, the data side printed circuit board 220 and the gate side printed circuit board 240 may include a gate driving signal, a signal for driving a liquid crystal display, a data signal, and a plurality of timing signals for applying these signals at an appropriate time. Is generated and applied to the gate line and the data line of the liquid crystal display panel 210.

A backlight assembly 300 is provided below the display unit 200 to provide uniform light to the display unit 200. The backlight assembly 300 includes a lamp 310 for generating light. The lamp 310 is protected by a lamp cover 312.

The light guide plate 320 has a size corresponding to that of the liquid crystal display panel 210 of the display unit 200 and is positioned below the liquid crystal display panel 210 to direct light generated from the lamp 310 toward the display unit 200. Change the path of the light while guiding.

A plurality of optical sheets 330 are provided on the light guide plate 320 to uniform the luminance of light emitted from the light guide plate 320 and directed toward the liquid crystal display panel 210. In addition, a reflector plate 340 is provided under the light guide plate 320 to reflect light leaked from the light guide plate 320 to the light guide plate 320 to increase light efficiency.

The display unit 200 and the backlight assembly 300 are fixedly supported by the mold frame 400, which is a storage container, as shown in FIG. 2. In addition, while bending the data side printed circuit board 220 and the gate side printed circuit board 240 of the display unit 200 to the outside of the mold frame 400 while fixing to the bottom surface of the mold frame 400. A chassis 500 is provided to prevent the display unit 200 from being separated.

As shown in FIG. 2, one end of the data side tape carrier package 230 is bonded to a black matrix area 216 of the liquid crystal display panel 210, and the other end thereof is a data side printed circuit board ( And electrically conductive therebetween. The data side tape carrier package 230 formed of a flexible film is bent to the rear while wrapping the outside of the mold frame 400, as shown in FIG. 2, the top chassis 500 and the rear case (not shown) Is fixed by.

However, in the backlight assembly, when the resolution and size of the liquid crystal display panel 210 are generally determined, the outline of the liquid crystal display panel 210 is determined as a suitable black matrix and bonding pad. For this reason, as shown in FIG. 2, in the structure in which the lamp 310 is adopted at the edge portion of the light guide plate 320, the height of the mold frame 400 accommodating the lamp 310 and the lamp cover 312 is one. The stationary end of the liquid crystal display panel 210 was located substantially inward from the end of the mold frame 400. As a result, the conductive film, that is, the data side tape carrier package 230 had to be formed long, and the manufacturing cost of the backlight assembly was increased.

The present invention proposed to solve the above-described problem, an object of the present invention is to provide a backlight assembly that can minimize the length of the conductive film for electrically connecting the printed circuit board and the display unit.

1 is an exploded perspective view schematically illustrating a backlight assembly of a conventional liquid crystal display;

FIG. 2 is a cross-sectional view illustrating a cross-sectional structure of a display unit and a printed circuit board of the backlight assembly shown in FIG. 1; FIG.

3 is an exploded perspective view illustrating a backlight assembly of a liquid crystal display according to an exemplary embodiment of the present invention; And

4 is a cross-sectional view illustrating a cross-sectional structure of a display unit and a printed circuit board of the backlight assembly illustrated in FIG. 3.

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

610 liquid crystal display panel 620: data printed circuit board

630: data tape carrier package 640: gate printed circuit board

650: gate tape carrier package 330: optical sheet

710: lamp 712: lamp cover

800: mold frame 900: top chassis

1010: front case 1020: rear case

The backlight assembly according to the present invention for achieving the above object, the lamp unit for generating light, the lamp unit is installed on the side wall, the light guide unit for guiding light from the lamp unit, the lamp unit and the light guide A storage container for accommodating the unit, and a display unit configured to display an image corresponding to the light guided by the light guiding unit and to be accommodated in the storage container opposite to the light guiding unit so that one end thereof overlaps with the lamp unit. do.

The backlight assembly further includes a printed circuit board on which a driving control circuit for controlling driving of the display unit is formed, and a conductive film for electrically connecting the printed circuit board and the display unit.

In addition, one end portion of the display unit overlapping the light guide unit is a region in which the conductive film is bonded.

According to such a backlight assembly, when viewed from the top of the liquid crystal display panel, the non-active area of the liquid crystal display panel is formed to extend in a long way so as to overlap the lamp and the lamp cover housed in the lower mold frame.

Therefore, the length of the conductive film for electrically connecting the liquid crystal display panel and the printed circuit board can be minimized, and the manufacturing cost of the backlight assembly can be further reduced.

3 is an exploded perspective view for schematically illustrating a liquid crystal display according to a preferred embodiment of the present invention.

Referring to FIG. 3, the liquid crystal display includes cases 1010 and 1020 including a liquid crystal display module for displaying an image by applying an image signal and a front and rear cases for accommodating the liquid crystal display module.

The liquid crystal display module includes a display unit 600 including a liquid crystal display panel 610 representing a screen.

The display unit 600 includes a liquid crystal display panel 612, a data side printed circuit board 620, a data side tape carrier package 630, a gate side printed circuit board 640, and a gate side tape carrier package 650. do.

The liquid crystal display panel 612 includes a thin film transistor substrate 612, a color filter substrate 614, and a liquid crystal (not shown).

The thin film transistor substrate 612 is a transparent glass substrate on which a matrix thin film transistor is formed. A data line is connected to a source terminal of the thin film transistors, and a gate line is connected to a gate terminal of the thin film transistors. In addition, a pixel electrode made of indium tin oxide (ITO), which is a transparent conductive material, is formed in the drain terminal.

When electrical signals are input to the data lines and the gate lines, electrical signals are input to the source and gate terminals of the respective thin film transistors, and the thin film transistors are turned on or turned off according to the input of the electrical signals, thereby draining the drain terminals. The furnace outputs an electrical signal necessary for pixel formation.

The color filter substrate 614 is provided to face the thin film transistor substrate 612. The color filter substrate 614 is a substrate in which RGB pixels, which are color pixels in which a predetermined color is expressed while light passes, are formed by a thin film process. The common electrode made of ITO is coated on the front surface of the color filter substrate 614.

When power is applied to the gate terminal and the source terminal of the transistor of the thin film transistor substrate 612 described above and the thin film transistor is turned on, an electric field is formed between the pixel electrode and the common electrode of the color filter substrate. By such an electric field, the arrangement angle of the liquid crystal injected between the thin film transistor substrate 612 and the color filter substrate 614 is changed, and the light transmittance is changed according to the changed arrangement angle to obtain a desired pixel.

A driving signal and a timing signal are applied to the gate line and the data line of the thin film transistor in order to control the arrangement angle of the liquid crystal of the liquid crystal display panel 610 and the timing when the liquid crystal is arranged.

As shown, a data tape carrier package 620, which is a type of flexible circuit board that determines when to apply the data driving signal, is attached to the source side of the liquid crystal display panel 610, and when the driving signal of the gate is applied to the gate side. The gate tape carrier package 640 is attached to determine.

The data-side printed circuit board 620 and the gate-side printed circuit board 640 for receiving image signals from the outside of the liquid crystal display panel 610 and applying driving signals to the gate lines and the data lines, respectively, are the liquid crystal display panel 610. Are connected to the data tape carrier package 630 on the data line side and the gate tape carrier package 650 on the gate line side, respectively. The data side printed circuit board 620 receives a video signal generated from an external information processing device (not shown) such as a computer, and has a source portion for providing a data driving signal to the liquid crystal display panel 610. The gate side printed circuit board 640 receives a video signal generated from an external information processing device (not shown) such as a computer, and provides a gate part for providing a gate driving signal to a gate line of the liquid crystal display panel 610. have.

That is, the data side printed circuit board 620 and the gate side printed circuit board 640 may include a gate driving signal, a signal for driving a liquid crystal display, a data signal, and a plurality of timing signals for applying these signals at an appropriate time. The gate driving signal is applied to the gate line of the liquid crystal display panel 610 through the gate tape carrier package 650, and the data signal is applied to the data line of the liquid crystal display panel 610 through the data tape carry package 630. To apply.

A backlight assembly 700 is provided below the display unit 600 to provide uniform light to the display unit 600. The backlight assembly 700 includes a lamp 710 for generating light. The lamps 710 are each protected by a lamp cover 712.

The light guide plate 720 has a size corresponding to that of the liquid crystal display panel 610 of the display unit 600 and is positioned below the liquid crystal display panel 610 so that the light generated by the lamp 710 is directed toward the display unit 600. Change the path of the light while guiding.

A plurality of optical sheets 730 are provided on the light guide plate 720 to uniform the luminance of light emitted from the light guide plate 720 and directed toward the liquid crystal display panel 610. In addition, a reflector plate 740 is provided below the light guide plate 720 to increase light efficiency by reflecting light leaked from the light guide plate 720 to the light guide plate 720.

The display unit 600 and the backlight assembly 700 are fixedly supported by the mold frame 800 which is a storage container. In addition, while fixing the data side printed circuit board 620 and the gate side printed circuit board 640 of the display unit 600 to the bottom of the mold frame 800 while bending the outside of the mold frame 800. A chassis 900 is provided to prevent the display unit 600 from being detached.

4 is a cross-sectional view illustrating a cross-sectional structure of the display unit and the printed circuit board illustrated in FIG. 3.

Referring to FIG. 4, the lamp cover 612 is coupled to one end of the light guide plate 720, and a lamp 610 is accommodated in the lamp cover 612. The lamp cover 612 in which the light guide plate 720 and the lamp 610 are accommodated is accommodated in the mold frame 800. Optical sheets 730 for sequentially improving the brightness of light emitted from the light guide plate 720 are sequentially received on the upper surface of the light guide plate 720.

The liquid crystal display panel 610 is disposed on the top surfaces of the optical sheets 730. In this case, the liquid crystal display panel 610 includes an active region and an inactive backlight 716 that display an image corresponding to the light provided through the light guide plate 720 and the optical sheets 730, and the inactive region 716. ) Is a black matrix area. One end of the conductive film, ie, the data tape carrier package 630, electrically connected to the data-side printed circuit board 620 is bonded to the inactive region 716.

In general, an active area of the liquid crystal display panel 610 has a smaller area than the optical sheets 730. An end portion of the liquid crystal display panel 610 other than the active region for displaying the actual image extends in a direction parallel to the light guide plate 720 within a range of the black matrix region within the range of the mold frame 800. Is formed.

That is, when viewed from the top of the liquid crystal display panel 610, the non-active area 716 of the liquid crystal display panel 610 may overlap the lamp cover 612 housed in the mold frame 800 under the liquid crystal display panel 610. It is formed long enough. Even though the non-active area 716 of the liquid crystal display panel 610 is extended as described above, the top surface of the mold frame 800 may be formed to prevent the increase in the overall thickness of the backlight assembly 700. It is shaved by increasing.

Meanwhile, the data tape carrier package 630 bonded to the end of the non-active area 716 of the liquid crystal display panel 610 is bent to its rear side to surround the outside of the mold frame 800. The other end of the data tape carrier package 630 is bonded to the data side printed circuit board 620 installed on the rear surface of the mold frame 800 so that the liquid crystal display panel 610 and the data side printed circuit board 620 are bonded. Is electrically connected.

Thereafter, the top chassis 900 is coupled to the top surface of the display unit 600 to fix the position of the display unit 600. The front case 1010 is coupled to face the top chassis 900, and the rear case 1020 is coupled to face the front case 1010 to complete a liquid crystal display.

According to the backlight assembly as described above, when viewed from the top of the liquid crystal display panel, the non-active area of the liquid crystal display panel is formed to extend long to overlap the lamp and the lamp cover housed in the mold frame of the lower portion.

Therefore, one end is bonded to an inactive area of the liquid crystal display panel so as to electrically connect between the liquid crystal display panel provided on the upper surface of the mold frame and the printed circuit board provided on the rear surface of the mold frame. The length of the conductive film bonded to the printed circuit board can be minimized. As a result, it is possible to further reduce the manufacturing cost of the liquid crystal display device, especially the backlight assembly.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand that you can.

Claims (6)

A lamp unit for generating light; A light guide unit provided at a side wall of the lamp unit for guiding light from the lamp unit; A storage container for storing the lamp unit and the light guide unit; And And a display unit configured to display an image corresponding to the light guided by the light guiding unit, and to be accommodated in the storage container so as to face the light guiding unit so that one end thereof overlaps with the lamp unit. The printed circuit board of claim 1, further comprising: a printed circuit board having a driving control circuit configured to control driving of the display unit; And And a conductive film for electrically connecting the printed circuit board and the display unit. The backlight assembly of claim 2, wherein one end of the display unit overlapping the light guide unit is a region in which the conductive film is bonded. A lamp unit for generating light; A light guide unit provided at a side wall of the lamp unit for guiding light from the lamp unit; A storage container for storing the lamp unit and the light guide unit; And The active area displaying an image corresponding to the light guided by the light guide unit and an inactive area in which a signal transmission pattern for electrical connection with an external device is formed, and the inactive area overlaps with the lamp unit. And a display unit that is accommodated in the storage container so as to face the light guide unit. The display apparatus of claim 4, wherein the external device comprises: a printed circuit board having a driving control circuit configured to control driving of the display unit; And And a conductive film for electrically connecting the printed circuit board and the display unit. The liquid crystal display of claim 5, wherein an inactive region of the display unit overlapping the light guide unit is a region in which the conductive film is bonded.