KR20070065592A - Liquid crystal display device - Google Patents

Abstract

An LCD(Liquid Crystal Display) is provided to reduce an outer size of the LCD by placing a keypad substrate on a mold frame inside the LCD. A receiving container(200) has a receiving space. A light generation unit(300) is received in the receiving container and generates light. An inverter(400) is disposed at a back surface of the receiving container, and applies driving power to the light generation unit. A mold frame(500) fixes the light generation unit. A display unit(800) includes an LCD panel(810) disposed on the mold frame, and a driving circuit part(820) connected to the LCD panel. A keypad substrate(600) is disposed on the mold frame, and includes a circuit board(610) and input buttons disposed on the circuit board. A top chassis(900) fixes an edge of the LCD panel, and includes insertion holes(910) through which the input buttons protrude.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

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

FIG. 2 is a rear view of the liquid crystal display shown in FIG. 1.

FIG. 3 is a plan view of the liquid crystal display shown in FIG. 1.

FIG. 4 is a cross-sectional view taken along the line II ′ of the LCD device illustrated in FIG. 1.

FIG. 5 is an enlarged view illustrating part 'A' of FIG. 4.

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

1000: liquid crystal display 100: backlight assembly

300: light generating unit 400: inverter

500: mold frame 600: keypad substrate

610: circuit board 620: input button

700: control printed circuit board 800: display unit

810: liquid crystal display panel 820: driving circuit

900: top chassis 910: insertion hole

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device that can reduce the outer size.

In general, a liquid crystal display (Liquid Crystal Display) is a flat panel display device that displays an image using a liquid crystal (Liquid Crystal), which is thinner and lighter than other image display devices, has a low driving voltage and low power consumption It has advantages and is used extensively throughout the industry.

The liquid crystal display includes a liquid crystal display panel for displaying an image, a backlight assembly disposed under the liquid crystal display panel to supply light, a storage container, and the like. On the other hand, the liquid crystal display device includes a keypad substrate disposed outside the liquid crystal display module to directly adjust the display state of the liquid crystal display panel.

The keypad substrate generates an input signal in accordance with a user's operation. At this time, the screen adjustment image according to the manipulation of the keypad substrate is displayed on the liquid crystal display panel. Therefore, the user can adjust the display state of the liquid crystal display panel such as brightness, color adjustment, screen position adjustment and the like while viewing the displayed screen adjustment image.

Recently, in order to secure a competitive edge, slimmer and lighter liquid crystal displays have been developed. In particular, development is underway to reduce the size of the liquid crystal display by reducing the size of the outer line of the liquid crystal display and the width of the active area where the screen is actually displayed (hereinafter referred to as bezel). It is becoming.

However, when the keypad substrate is coupled to the outside of the liquid crystal display module, the size of the bezel of the liquid crystal display apparatus increases due to the combination of the keypad substrate, which causes a problem in reducing the outer size of the liquid crystal display apparatus.

Accordingly, the present invention has been made in view of such a problem, and the present invention provides a liquid crystal display device capable of reducing the size of the bezel by reducing the size of the bezel.

According to an aspect of the present invention, a liquid crystal display device includes a storage container having a storage space, a light generating unit accommodated in the storage container for generating light, an inverter for applying driving power to the light generating unit, and the light generating unit. A display unit including a mold frame configured to fix a sidewall, a liquid crystal display panel disposed on the mold frame, and a driving circuit connected to the liquid crystal display panel, a keypad substrate disposed on the mold frame, and an edge of the liquid crystal display panel. Includes a top chassis to secure it. The inverter is disposed on the rear surface of the storage container. The keypad substrate includes a circuit board and input buttons disposed on the circuit board. The top chassis includes insertion holes formed to protrude the input buttons.

The mold frame includes a receiving groove formed to correspond to the shape of the keypad substrate at a position where the keypad substrate is disposed.

The liquid crystal display further includes a control printed circuit board connected to the keypad substrate to generate a control signal in response to an input signal from the keypad substrate. The control printed circuit board is disposed on the rear surface of the storage container.

According to the liquid crystal display device, since the keypad substrate for adjusting the display state of the liquid crystal display panel is disposed on the mold frame, the size of the bezel can be reduced compared with the structure in which the keypad substrate is coupled to the outside of the liquid crystal display device. Can be.

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

1 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 2 is a rear view of the liquid crystal display shown in FIG. 1.

1 and 2, the liquid crystal display 1000 may include a backlight assembly 100, a keypad substrate 600, a display unit 800, and a top chassis 900.

The backlight assembly 100 generates light necessary for the liquid crystal display panel 810 to display an image and supplies the light to the liquid crystal display panel 810. The backlight assembly 100 includes a storage container 200, a light generating unit 300, an inverter 400, and a mold frame 500.

The storage container 200 includes a bottom surface 210 and sidewalls 220 extending vertically from an edge of the bottom surface 210 to form a storage space. An inverter 400 and a control printed circuit board 700 are disposed on the rear surface of the storage container 200. The storage container 200 is made of a material having little deformation and excellent strength.

The light generating unit 300 is stored in the storage space of the storage container 200. The light generating unit 300 includes a lamp unit 310 and a light guide plate 320.

At least one lamp unit 310 is disposed at an edge of a storage space of the storage container 200. In this embodiment, the lamp unit 310 is disposed at each of the opposite side edges of the storage space. That is, the lamp unit 310 is disposed to face each other at both sides of the light guide plate 320. Alternatively, the lamp unit 310 may be disposed only on one side of the light guide plate 320.

The lamp unit 310 includes a lamp 312 for generating light and a lamp cover 314 surrounding three surfaces of the lamp 312. One lamp 312 is disposed inside the lamp cover 314. Meanwhile, in the case of a product requiring high brightness, two or more lamps 312 may be disposed in the lamp cover 314. The lamp 312 is connected with the inverter 400 through lamp wires 316.

The lamp 312 generates light in response to the driving power applied from the inverter 400. For example, the lamp 312 is made of a cold cathode fluorescent lamp (CCFL) having an elongated cylindrical shape. Alternatively, the lamp 312 may be formed of an external electrode fluorescent lamp (EEFL) having external electrodes formed at both ends thereof.

The lamp cover 314 covers the three sides of the lamp 312 to protect the lamp 312. The lamp cover 314 is made of a metal having a high reflectance, or has a structure in which a reflective material having a high reflectance is coated on an inner surface of the metal. The lamp cover 314 reflects the light generated by the lamp 312 toward the light guide plate 320 to improve light utilization efficiency.

The light guide plate 320 is accommodated in the storage space of the storage container 200, and guides the light from the lamp unit 310 disposed at the side to the upper direction. The light guide plate 320 is made of a transparent material for guiding light. For example, the light guide plate 320 is made of polymethyl methacrylate (PMMA).

A predetermined reflection pattern (not shown) for scattering reflection of light is formed on the bottom surface of the light guide plate 320. For example, the reflective pattern consists of a printing pattern or an uneven pattern. Light incident from the lamp unit 310 into the light guide plate 320 is scattered and reflected by a reflection pattern, and light exceeding a specific critical angle is emitted through the top surface of the light guide plate 320.

Meanwhile, the backlight assembly 100 is a reflective sheet 330 disposed below the light guide plate 320 and an optical sheet 340 disposed above the light guide plate 320 to improve characteristics of light emitted from the light guide plate 320. It further includes.

The reflective sheet 330 reflects light leaking into the lower portion of the light guide plate 320 to improve light utilization efficiency. The reflective sheet 330 is made of a material having high light reflectance. On the other hand, when the bottom surface 210 of the storage container 200 is made of a material having high light reflectance, the reflective sheet 330 may be removed.

The optical sheet 340 improves luminance characteristics of light emitted upward from the light guide plate 320. The optical sheet 340 may include a diffusion sheet to diffuse light emitted from the light guide plate 320 to improve luminance uniformity. In addition, the optical sheet 340 may include a prism sheet for condensing the light emitted from the light guide plate 320 in the front direction to improve the front brightness of the light. On the other hand, the backlight assembly 100 may further include an optical sheet 340 of various functions according to the characteristics of the light required.

The inverter 400 is disposed on the rear surface of the storage container 200 to apply driving power to the lamp 312. In detail, the inverter 400 changes the DC power of low potential supplied from the outside into a high potential AC power suitable for driving the lamp 312, and outputs driving power to the lamp 312.

The mold frame 500 is coupled to the storage container 200 and fixes the light generating unit 300 and the optical sheet 340. The keypad substrate 600 is disposed in the mold frame 500, and the receiving groove 510 is formed at the position where the keypad substrate 600 is disposed to correspond to the shape of the keypad substrate 600.

The keypad substrate 600 includes a circuit board 610 and input buttons 620 disposed on the circuit board 610. The keypad substrate 600 generates an input signal for adjusting the display state of the liquid crystal display panel 810 through the operation of the input buttons 620. For example, the keypad substrate 600 generates an input signal for adjusting the brightness of the image, adjusting the color, adjusting the screen position, and the like.

The keypad substrate 600 is disposed on the mold frame 500. For example, the keypad substrate is disposed below the mold frame 500. Meanwhile, the keypad substrate 600 may be disposed on the right side on the mold frame 500. In addition, the keypad substrate 600 may be disposed at various positions on the mold frame 500. Therefore, since the keypad substrate 600 is disposed on the mold frame 500, the size of the bezel is reduced compared to the structure in which the keypad substrate 600 is disposed outside the liquid crystal display 1000. 1000, the outer size can be reduced.

The backlight assembly 100 further includes a control printed circuit board 700 connected to the keypad substrate 600 to generate a control signal corresponding to an input signal from the keypad substrate 600.

The control printed circuit board 700 receives an input signal from the keypad substrate and generates a control signal for controlling an image of the liquid crystal display panel 810. The control printed circuit board 700 is connected to, for example, the keypad substrate 600 and the flexible film cable 630.

The control printed circuit board 700 is disposed on the rear surface of the storage container 200. The control printed circuit board 700 is connected to the keypad substrate 600, the inverter 400, and the driving circuit unit 820 of the display unit 800, respectively. The control printed circuit board 700 receives an input signal from the keypad substrate 600, adjusts the size of power applied to the inverter 400, and applies a control signal to the driving circuit unit 820.

Specifically, the control printed circuit board 700 is connected through the inverter 400 and the power wires 710. The control printed circuit board 700 receives an input signal for adjusting brightness from the keypad substrate 600 and adjusts the size of the power to the inverter 400. The inverter 400 converts power applied from the control printed circuit board 700 into driving power for driving the lamp. Therefore, the lamp 312 emits light of luminance corresponding to the size of the driving power source. As a result, the luminance of the liquid crystal display panel 810 may be adjusted by manipulating the keypad substrate 600. On the other hand, the control printed circuit board 700 is connected to the source printed circuit board 822 and the flexible circuit film 720 of the driving circuit unit 820. The control printed circuit board 700 receives an input signal for color adjustment and screen position adjustment from the keypad substrate 600, converts the input signal into a control signal for image adjustment, and then converts it into a driving circuit unit 820 of the display unit 800. Is authorized. The driving circuit unit 820 drives the liquid crystal display panel 810 in response to a control signal from the control printed circuit board 700.

On the other hand, when the keypad substrate 600 is operated, a screen adjustment image according to the manipulation of the keypad substrate 600 is displayed on the liquid crystal display panel 810.

The display unit 800 includes a liquid crystal display panel 810 for receiving light from the backlight assembly 100 and displaying an image, and a driving circuit unit 820 for driving the liquid crystal display panel 810.

The liquid crystal display panel 810 is disposed on the mold frame 500. The liquid crystal display panel 810 includes a first substrate 812, a second substrate 814 coupled to face the first substrate 812, and a liquid crystal disposed between the first substrate 812 and the second substrate 814. Layer (not shown).

The first substrate 812 is a transparent glass substrate in which thin film transistors (hereinafter referred to as TFTs) to which pixel electrodes are connected are formed in a matrix form. The second substrate 814 is a glass substrate in which RGB pixels for color are formed by a thin film process, and a common electrode made of a transparent conductive material is formed.

Accordingly, when power is applied to the TFT, the liquid crystal display panel 810 forms an electric field between the pixel electrode and the common electrode, and is interposed between the first substrate 812 and the second substrate 814 by the electric field. The arrangement of the liquid crystal molecules of the liquid crystal layer (not shown) is changed, and the transmittance of light is changed according to the arrangement change of the liquid crystal molecules to display a desired image.

The driving circuit unit 820 is connected to the control printed circuit board 700, and outputs various control signals for driving the liquid crystal display panel 810, and the source printed circuit board 822. The data driving circuit film 824 connects the liquid crystal display panel 810 and the gate driving circuit film 826 connected to the liquid crystal display panel 810.

The data driving circuit film 824 and the gate driving circuit film 826 output a driving signal for driving the liquid crystal display panel 810 in response to a control signal supplied from the source printed circuit board 822. ). The data driving circuit film 824 and the gate driving circuit film 826 are made of, for example, a tape carrier package (TCP) or a chip on film (COF).

The driving circuit unit 820 may further include a gate printed circuit board (not shown) connected to the gate driving circuit film 826.

The top chassis 900 is coupled to the mold frame 500 while surrounding the edge of the liquid crystal display panel 810 to fix the liquid crystal display panel 810 to the upper portion of the backlight assembly 100. In this case, the source printed circuit board 822 is disposed on the rear surface of the storage container 200 by bending the data driving circuit film 824.

Insertion holes 910 are formed in the top chassis 900 such that the input buttons 620 of the keypad substrate 600 protrude.

FIG. 3 is a plan view of the liquid crystal display shown in FIG. 1.

Referring to FIG. 3, the top chassis 900 has a fixing part 920 formed along the edge of the liquid crystal display panel 810 to fix the edge of the liquid crystal display panel 810. Thus, the width of the fixing portion 920 of the top chassis 900 becomes the bezel.

The input buttons 620 for adjusting the image of the liquid crystal display panel 810 are disposed inside the liquid crystal display 1000 and protrude through the insertion holes 910 of the top chassis 900. Accordingly, the size of the bezel may be reduced compared to the structure in which the input buttons 620 are disposed outside the liquid crystal display 1000.

The insertion holes 910 are formed at, for example, a lower side or a right center portion of the fixing portion 920 of the top chassis 900. On the other hand, the insertion holes 910 may be formed in the upper or left center portion of the fixing part 920. In addition, the insertion holes 910 may be formed to be biased in one direction at the center of each side of the fixing part 920.

FIG. 4 is a cross-sectional view taken along the line II ′ of the liquid crystal display device illustrated in FIG. 1, and FIG. 5 is an enlarged view of a portion 'A' of FIG. 4.

4 and 5, the storage container 200 includes a lamp unit 310, a light guide plate 320, and an optical sheet 340 including a reflective sheet 330, a lamp 312, and a lamp cover 314. It is stored. The mold frame 500 fixes the light generating unit 300 and the optical sheet 340 to the storage container 200, and is coupled to the storage container 200. The liquid crystal display panel 810 and the keypad substrate 600 are disposed on the mold frame 500. The top chassis 900 is coupled to the mold frame 500 by fixing the edge of the liquid crystal display panel 810. An insertion hole 910 is formed in the top chassis 900.

The mold frame 500 may include a first upper surface 520 for arranging the liquid crystal display panel 810 and a second upper surface 530 formed above the first upper surface 520 adjacent to the first upper surface 520. Include. The liquid crystal display panel 810 is disposed on the first upper surface 520. In this case, the liquid crystal display panel 810 is spaced apart from the optical sheet 340 by the mold frame 500. The receiving groove 510 is formed on the second upper surface 530 to correspond to the shape of the circuit board 610 of the keypad substrate 600 for the arrangement of the keypad substrate 600.

The keypad substrate 600 is disposed in the accommodation groove 510. The receiving groove 510 prevents the flow of the keypad substrate 600 and prevents an increase in the overall thickness due to the keypad substrate 600 when the liquid crystal display device 1000 is assembled.

The keypad substrate 600 may be fixed to the accommodation groove 510 through the fixing member 540. The fixing member 540 may be, for example, a double-sided tape.

The input button 620 protrudes upward through the insertion hole 910. At this time, the input button 620 is formed to protrude sufficiently from the insertion hole 910 to operate by pressing. When the input button 620 is operated, an input signal corresponding to the input button 620 is generated and transmitted to the outside.

According to such a liquid crystal display device, since a keypad substrate on which the user can directly adjust the display state of the liquid crystal display panel is disposed on the mold frame and positioned inside the liquid crystal display device, the keypad substrate is external to the liquid crystal display device. The size of the bezel is reduced compared to the structure that is bonded to it. Therefore, the outer size of the liquid crystal display device can be reduced.

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.

Claims (8)

A storage container having a storage space; A light generating unit accommodated in the storage container to generate light; An inverter disposed on a rear surface of the storage container to apply driving power to the light generating unit; A mold frame fixing the light generating unit; A display unit including a liquid crystal display panel disposed on the mold frame and a driving circuit connected to the liquid crystal display panel; A keypad substrate disposed on the mold frame and including a circuit board and input buttons disposed on the circuit board; And  And a top chassis fixing an edge of the liquid crystal display panel and having insertion holes formed therein to protrude the input buttons. The liquid crystal display device of claim 1, wherein the mold frame includes a receiving groove formed to correspond to the shape of the keypad substrate at a position where the keypad substrate is disposed. The apparatus of claim 1, further comprising a control printed circuit board disposed on a rear surface of the storage container and connected to the keypad substrate to generate a control signal in response to an input signal from the keypad substrate. Liquid crystal display device. The method of claim 1, wherein the light generating unit A lamp unit disposed at an edge of the accommodation space and including a lamp for generating light and a lamp cover surrounding three surfaces of the lamp; And And a light guide plate stored in the storage space and guiding light from the lamp unit toward the liquid crystal display panel. The liquid crystal display of claim 4, wherein the lamp units are disposed at opposite edges of the storage space facing each other. The liquid crystal display device according to claim 1, wherein the keypad substrate is disposed on an upper surface of the lower side of the mold frame. The liquid crystal display device according to claim 1, wherein the keypad substrate is disposed on an upper right side of the mold frame. The liquid crystal display of claim 1, wherein the keypad is fixed to an upper surface of the mold frame through a fixing member.

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