KR20080085590A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
KR20080085590A
KR20080085590A KR1020070027326A KR20070027326A KR20080085590A KR 20080085590 A KR20080085590 A KR 20080085590A KR 1020070027326 A KR1020070027326 A KR 1020070027326A KR 20070027326 A KR20070027326 A KR 20070027326A KR 20080085590 A KR20080085590 A KR 20080085590A
Authority
KR
South Korea
Prior art keywords
liquid crystal
crystal panel
panel
crystal display
led
Prior art date
Application number
KR1020070027326A
Other languages
Korean (ko)
Inventor
정해현
Original Assignee
엘지이노텍 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020070027326A priority Critical patent/KR20080085590A/en
Publication of KR20080085590A publication Critical patent/KR20080085590A/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0083—Details of electrical connections of light sources to drivers, circuit boards, or the like
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13452—Conductors connecting driver circuitry and terminals of panels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/42—Arrangements for providing conduction through an insulating substrate

Abstract

The present invention relates to a liquid crystal display device, comprising: a liquid crystal panel for outputting an image, a light guide plate for transmitting light to the liquid crystal panel, a flexible circuit board for driving a liquid crystal panel coupled to the liquid crystal panel, and the light guide plate It is configured to include an LED mounted on the flexible circuit board for driving the liquid crystal panel.

Description

Liquid crystal display device

1 is a front view showing the internal configuration of a conventional liquid crystal display device.

2 is a cross-sectional view of a conventional liquid crystal display device.

3 is a front view showing an internal configuration of a liquid crystal display device according to the present invention.

4 is a cross-sectional view of a liquid crystal display device according to the present invention.

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

100: liquid crystal panel 110: first panel

120: second panel 200: light guide plate

300: LED 400: flexible circuit board for driving the liquid crystal panel

500: liquid crystal drive chip 600: frame

The present invention relates to a liquid crystal display device.

In general, the liquid crystal display device is portable as one type of flat panel display element, and has been widely used in recent years because it has advantages of flat panel, thin film, low power consumption, and high image quality. However, since the liquid crystal display panel used in the liquid crystal display device does not emit light by itself and only modulates the transmitted light, a backlight unit should be provided at the rear of the liquid crystal display panel, and the performance of the liquid crystal display device is not limited to the liquid crystal display device itself. It greatly depends on the performance of the backlight used.

Hereinafter, exemplary embodiments of a liquid crystal display device in which a light source is mounted on a flexible circuit board will be described in detail with reference to the accompanying drawings.

1 is a front view showing the internal structure of a conventional liquid crystal display device, and FIG. 2 is a cross-sectional view of a conventional liquid crystal display device.

As shown in FIGS. 1 and 2, a conventional liquid crystal display device includes a liquid crystal panel 10 for outputting an image to the outside, a light guide plate 20 coupled to a rear surface of the liquid crystal panel 10, and the liquid crystal panel. The flexible circuit board 40 for driving the liquid crystal panel coupled to the 10, the flexible circuit board 42 for the LED coupled to the rear of the liquid crystal panel 10, and emits light to one side of the light guide plate 20 It includes an LED 30 mounted on the flexible flexible printed circuit board 42 for the LED, and a frame 60 coupled to surround each of the components.

The liquid crystal panel 10 includes a first panel 11 and the second panel 12 coupled to a rear surface of the first panel 11, and the second panel 12 has a lower end thereof. It is formed to protrude below the first panel (11). In addition, polarizing plates 13 are respectively coupled to both surfaces of the liquid crystal panel 10.

In this case, in the conventional LCD, an LCD drive IC 50 is mounted on the lower front surface of the second panel, and the LED 30 is positioned on the lower rear surface of the second panel 12. Bar, there is a problem that there is a limit in thinning of the product. In addition, since the flexible circuit board 40 for driving the liquid crystal panel 10 for driving the liquid crystal panel 10 and the flexible circuit board 42 for driving the LED 30 need to be separately provided, the number of parts increases. The disadvantage is that the internal configuration is complicated.

In addition, the liquid crystal drive chip 50 is vertically overlapped with the LED 30, and the portion on which the LED 30 is mounted is heavily formed irregularities, the liquid crystal drive chip 50 is mounted There is a problem that the static pressure strength of the site is weak compared to other sites.

In addition, in the conventional LCD, since the distance between the display area (not shown) of the liquid crystal panel 10 and the LED 30 is short, the light emitted from the LED 30 may not be sufficiently spread. Another disadvantage is that the brightness of each part is uneven.

Accordingly, the present invention provides a liquid crystal display device in which an LED is mounted on a liquid crystal panel driving flexible circuit board and the LED mounting area is positioned outside the area of the LCD panel.

According to an aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal panel for outputting an image, a light guide plate for transmitting light to the liquid crystal panel, a flexible circuit board for driving a liquid crystal panel coupled to the liquid crystal panel; And an LED mounted on the liquid crystal panel driving flexible circuit board to irradiate light to the light guide plate.

Hereinafter, exemplary embodiments of a liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a front view showing an internal configuration of a liquid crystal display device according to the present invention, and FIG. 4 is a cross-sectional view of the liquid crystal display device according to the present invention.

3 and 4, the liquid crystal display according to the present invention includes a liquid crystal panel 100 for outputting an image to the front and a liquid crystal panel 100 to transmit light to the liquid crystal panel 100. The light guide plate 200 coupled to the rear surface, the LED 300 for irradiating light to one end of the light guide plate 200 (the bottom in this embodiment), and the liquid crystal panel 100 are coupled to the current and various electrical signals. It includes a flexible printed circuit board 400 for driving the liquid crystal panel and a frame 600 for fixing the position of the components. A polarizer and various optical sheets are provided between the liquid crystal panel 100 and the light guide plate 200.

The liquid crystal panel 100 includes a first panel 110 and a second panel 120 coupled in a stacking manner, and the second panel 120 has a lower end protruding downward from the first panel 110. The liquid crystal driving chip 500 (LCD drive IC) for controlling the operation of the liquid crystal display device is mounted on the front surface of the lower end of the second panel 120. At this time, the liquid crystal display according to the present invention is the same as the conventional liquid crystal display device in the configuration and coupling structure of the liquid crystal panel 100 and the liquid crystal driving chip 500, and a detailed description thereof will be omitted.

The liquid crystal display according to the present invention is characterized in that the LED 300 is configured to be mounted on the liquid crystal panel driving flexible circuit board 400 instead of being mounted on a flexible circuit board for the LED 300 separately configured. In addition, since the LED 300 mounting area is located outside the liquid crystal display device area, the static pressure strength of the liquid crystal driving chip portion of the liquid crystal display device can be improved and the distance between the LED and the display area can be sufficiently secured to improve the display quality. There is an advantage.

That is, the liquid crystal display device according to the present invention does not require the flexible circuit board for the LED 300, the number of parts is reduced compared to the conventional liquid crystal display device, there is an advantage that the manufacturing cost reduction effect can be obtained. In addition, the liquid crystal display device according to the present invention can transmit electric current and various electrical signals to the liquid crystal panel 100 and the LED 300 with one flexible circuit board 400 for driving the liquid crystal panel. There is an advantage that it is easy.

As described above, in order for the LED 300 to be mounted on the liquid crystal panel driving flexible circuit board 400, the LCD 300 may be in direct contact with the liquid crystal panel driving flexible circuit board 400. When the LED 300 is located at a lower point than the lower end of the liquid crystal panel 100, the LED 300 is not interfered with the liquid crystal panel 100 in the horizontal direction. . Accordingly, in the liquid crystal display according to the present invention, the extension surface of the surface on which the LED 300 is mounted on the liquid crystal panel driving flexible circuit board 400 is positioned in front of the extension surface of the rear surface of the second panel 120. That is, one surface of the LED 300 in contact with the liquid crystal panel driving flexible circuit board 400 protrudes forward (leftward in FIG. 4) than the rear surface of the second panel 120. The mounting position can be changed. As such, when the mounting position of the LED 300 is moved forward, the distance from the front side of the liquid crystal panel 100 to the rear side of the light guide plate 200 is reduced, thereby making it possible to slim the product.

In this case, the light guide plate 200 should be configured such that a lower end thereof extends downward to be in contact with the LED 300 so as to receive light emitted from the LED 300.

In addition, in the liquid crystal display according to the present invention, since the liquid crystal driving chip 500 and the LED 300 are positioned at different heights, the base surface of the liquid crystal driving chip 500 may be formed flat. That is, the liquid crystal display device according to the present invention does not need to provide a space for mounting the LED 300 on the rear of the portion where the liquid crystal driver chip 500 is mounted, and thus, the portion where the liquid crystal driver chip 500 is mounted. It is possible to form more robustly.

As such, since the base surface of the liquid crystal driver chip 500 may be formed flat, it means that the liquid crystal driver chip 500 may be more stably fixed. There is an advantage that the static pressure strength can be improved.

In addition, as illustrated in FIG. 4, the light guide plate 200 is formed to have a thin portion corresponding to the liquid crystal panel 100, and only a portion where the light guide plate 200 is coupled to the LED 300 has the same thickness as that of the LED 300. It may be formed to have a thick. When the light guide plate 200 is formed in such a shape, since only the thin portion is combined in such a manner as to be stacked on the rear surface of the liquid crystal panel 100, the entire thickness of the liquid crystal display device may be reduced.

In this case, when the portion of the light guide plate 200 that is coupled to the LED 300 is thickened to protrude to the rear side, there is no effect of reducing the thickness of the liquid crystal display, and thus the light guide plate 200 is lower than the liquid crystal panel 100 in the front side. It is preferable that the portion located in the shape is formed to protrude forward.

As mentioned above, although this invention was demonstrated in detail using the preferable embodiment, the scope of the present invention is not limited to a specific embodiment and should be interpreted based on attached claim. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

In the liquid crystal display device according to the present invention, the LED is mounted on the flexible circuit board for driving the liquid crystal panel and the LED mounting area is positioned outside the area of the liquid crystal panel, thereby making the product slimmer and simplifying the manufacturing process and reducing the manufacturing cost by reducing the number of parts. It is possible to obtain the effect of, and there is an advantage that the static pressure strength of the product is increased.

Claims (3)

LCD panel to output images Light guide plate for transmitting light to the liquid crystal panel Flexible circuit board for driving the liquid crystal panel coupled to the liquid crystal panel and LED mounted on the liquid crystal panel driving flexible circuit board to irradiate light to the light guide plate Liquid crystal display device comprising a. The method of claim 1, The light guide plate is coupled to a rear surface of the liquid crystal panel such that a light incident part is located below the lower end of the liquid crystal panel, The liquid crystal panel driving flexible circuit board is formed to extend further below the lower end of the light guide plate, The LED is coupled to irradiate light to the lower end of the light guide plate. The method of claim 1, And a portion of the LED mounted on the flexible circuit board for driving the liquid crystal panel is located below the second panel.
KR1020070027326A 2007-03-20 2007-03-20 Liquid crystal display device KR20080085590A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070027326A KR20080085590A (en) 2007-03-20 2007-03-20 Liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070027326A KR20080085590A (en) 2007-03-20 2007-03-20 Liquid crystal display device

Publications (1)

Publication Number Publication Date
KR20080085590A true KR20080085590A (en) 2008-09-24

Family

ID=40025286

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020070027326A KR20080085590A (en) 2007-03-20 2007-03-20 Liquid crystal display device

Country Status (1)

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KR (1) KR20080085590A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8408928B2 (en) 2010-12-02 2013-04-02 Samsung Display Co., Ltd. Connector and display apparatus having the same
US8804088B2 (en) 2009-12-16 2014-08-12 Samsung Display Co., Ltd. Backlight unit and liquid crystal display device having the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8804088B2 (en) 2009-12-16 2014-08-12 Samsung Display Co., Ltd. Backlight unit and liquid crystal display device having the same
US8408928B2 (en) 2010-12-02 2013-04-02 Samsung Display Co., Ltd. Connector and display apparatus having the same

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N231 Notification of change of applicant
WITN Withdrawal due to no request for examination