KR20080018594A - Led array and backlight unit for display device - Google Patents

Abstract

An LED array for a display device and a backlight unit using the same are provided to improve assembling efficiency and remove assembly deviation with regard to the optimum position to prevent lowering of image display quality. An LED(Light Emitting Diode) array(30) includes LED devices(34) and an LED package substrate(32) for packaging the LED devices and having protrusions(36) for insertion, wherein the protrusions for insertion are integratedly formed with the LED package substrate. A cover bottom has insertion holes for inserting the protrusions for insertion of the LED array. The LED array is coupled through the insertion holes of the cover bottom to standardize a constitution position of the LED array.

Description

LED array for display device and backlight unit using the same {LED array and backlight unit for display device}

1 is a block diagram showing the basic configuration of a general liquid crystal display device

FIG. 2 is a view schematically illustrating a configuration of a liquid crystal panel among the components of FIG. 1.

3A and 3B are a plan view and a side view, respectively, showing a first embodiment of a LED array for a backlight unit according to the present invention;

4A and 4B are a plan view and a side cross-sectional view, respectively, showing a coupling form according to the first application example of the backlight unit according to the present invention;

5A and 5B are a plan view and a cross-sectional side view showing a coupling form according to the second application example of the backlight unit according to the present invention, respectively;

6A and 6B are a plan view and a side view, respectively, showing a second embodiment of an LED array for a backlight unit according to the present invention;

7A and 7B are a plan view and a side cross-sectional view, respectively, illustrating a coupling form according to a third application example of the backlight unit according to the present invention;

<Brief description of the main parts of the drawing>

30: LED array 32: LED mounting board

34: LED element 36: fitting protrusion

40: cover bottom 42: fitting hole

50 light guide plate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit for a display device, and more particularly, to an LED array and a backlight unit using the same, which improve assembly quality and light uniformity, and also improve light defect of a display panel.

Among the display devices, in particular, liquid crystal displays have advantages of small size, thinness, and low power consumption, and are used as notebook computers, office automation devices, and audio / video devices. In particular, an active matrix liquid crystal display device using a thin film transistor (hereinafter referred to as "TFT") as a switch element is suitable for displaying a dynamic image.

FIG. 1 is a block diagram showing a basic configuration of a general liquid crystal display device, and is largely divided into a liquid crystal panel 2 and an LCM driving circuit unit 26.

In each configuration, the interface 10 includes data (RGB Data) and control signals (input clock, horizontal synchronous signal, vertical synchronous signal, data input) input from the drive system such as a personal computer to the LCM drive circuit unit 26. Able signal, etc.) are input and supplied to the timing controller 12. Low voltage differential signal (LVDS) interface and TTL interface are mainly used for data and control signal transmission from the drive system. In addition, the interface function may be collected and used together with the timing controller 12 in a single chip.

As illustrated in FIG. 2, the liquid crystal panel 2 forms a plurality of pixel regions by crossing a plurality of data lines DL1 to DLm and a plurality of gate lines GL1 to GLn on a glass substrate. In the region, a thin film transistor TFT and a liquid crystal LC are configured to display a screen.

The timing controller 12 drives a source driver 18 composed of a plurality of drive integrated circuits and a gate driver 20 composed of a plurality of gate driver integrated circuits using a control signal input through the interface 10. Generate a control signal for In addition, the data input through the interface 10 is transmitted to the source driver 18.

The reference voltage generator 16 generates reference voltages of a digital to analog converter (DAC) used in the source driver 18. The reference voltages are preset and manufactured based on the transmittance-voltage characteristic of the panel.

The source driver 18 selects reference voltages of the input data in response to control signals input from the timing controller 12, and supplies the selected reference voltage to the liquid crystal panel 2 to control the rotation angle of the liquid crystal molecules.

The gate driver 20 performs on / off control of thin film transistors TFTs arranged on the liquid crystal panel 2 in response to control signals input from the timing controller 12. Source driver 18 by sequentially driving thin film transistors TFT on the liquid crystal panel 2 by one line by sequentially enabling the gate lines GL1 to GLn by one horizontal synchronizing time. The analog image signals supplied from the plurality of pixels are applied to the pixels connected to the respective TFTs.

The power supply voltage generator 14 supplies operating power of each component and generates and supplies a common electrode voltage of the liquid crystal panel 2.

Although not shown, the apparatus further includes a backlight unit having one or more lamps to supply light to the liquid crystal panel 2.

As a lamp used in the backlight unit, a cold cathode fluorescent lamp (hereinafter referred to as 'CCFL') is mainly used. The backlight unit using the CCFL includes a lamp for generating light, a lamp housing installed in a form surrounding the lamp, a light guide plate for converting light incident from the lamp into a planar light source, a lower surface of the light guide plate under the light guide plate, A reflecting plate for reflecting the light propagating toward the upper surface toward the upper surface, a first diffusion sheet for diffusing light through the light guide plate, a first and second prism sheet for adjusting the traveling direction of the light passing through the first diffusion sheet, and a prism And a second diffusion sheet for diffusing light via the sheet.

Such a backlight unit has a trend of miniaturization, thinning, and weight reduction, and according to this trend, luminance of about 1 cd (candela) is expressed by a voltage of several volts (V) and a current of several to several tens of milliamps (mA) instead of CCFL. A new method of using a light emitting diode (LED), which is possible and advantageous in terms of power consumption, weight, and brightness, has been proposed.

The present invention proposes a backlight unit using an LED device according to the recent trend, and in particular, to provide an LED array and a backlight unit using the same, which can provide effects such as improvement in assemblability and light uniformity, and improvement in bright lines of a liquid crystal panel. There is this.

The present invention to achieve the above object, the LED element; The LED device is mounted, and provides an LED array including an LED mounting substrate having a fitting protrusion.

The fitting protrusion is characterized in that formed on the side or back of the LED mounting substrate.

The fitting protrusion is characterized in that it is composed of one planar shape of the rectangular, semi-circular, triangular.

The LED mounting substrate is characterized in that the metal PC.

In another aspect, the present invention, the LED array and the LED array including the LED mounting substrate on which the LED element is mounted and the protrusion for fitting is formed; It provides a backlight unit including a cover bottom formed with a fitting hole for fitting the fitting protrusions of the LED array.

The fitting hole is formed on one of the inner bottom surface, the ceiling surface, the side wall surface of the cover bottom.

The end of the cover bottom is characterized in that formed in the "b" shape or "c" shape.

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

3A and 3B are a plan view and a side view showing a first form of the LED array 30 for a backlight unit according to the present invention, respectively, by separating a plurality of LED elements 34 on the LED mounting substrate 32 at regular intervals. The configured form is shown.

At this time, the LED mounting substrate 32 is made of a high thermal conductivity metal PCB (Metal PCB).

In addition, referring to the plan view of Figure 3a, it can be seen that a plurality of fitting projections 36 are formed on one side of the LED mounting substrate 32, the fitting projection 36 is the LED mounting substrate 32 By incorporating the design into a planar shape of the structure, the LED mounting substrate 32 is formed integrally.

The fitting protrusion 36 is configured to fasten the LED array 30 to a display device, and more particularly, to form a fitting hole (described below) at a cover bottom, so that the LED array 30 is mounted on the display device. ) Can standardize the configuration position, and also improve the assembly performance and improve the problems such as the occurrence of the display panel due to the assembly failure.

In addition, the shape of the fitting protrusion 36 may be designed by applying various shapes such as a triangular shape or a semi-circle shape as well as the rectangular shape already shown in a plan view of the LED array 30 as shown in FIG. 3A. have.

4A and 4B are plan and side cross-sectional views, respectively, showing a first application example of a backlight unit including the LED array 30 of the first type and the cover bottom 40 of the first type according to the present invention already described above. In particular, the LED array 30 and the cover bottom 40 is shown mainly in the form of fastening.

4A and 4A, which are cross-sectional views taken along line AA of FIG. 4A, a liquid crystal panel (not shown) is disposed on the top and a light guide panel 50 of FIG. In performing fastening between the LED arrays 30 according to the present invention, a fitting hole (42 in FIG. 4B) is formed in a portion of the cover bottom 40. At this time, the cover bottom 40 of the first type which is fastened to the LED array 30 has an end portion of the shape “b”, and the fitting hole 42 is a fitting protrusion of the LED array 30. It is formed on the inner bottom surface of the cover bottom 40 so as to be engaged by pushing the 36 to the lower side.

In addition, the fitting hole 42 has a shape, size, and number depending on the shape, size, and number of the fitting protrusions 36 to fit the fitting protrusions 36 of the LED array 30. It is natural to be determined.

For reference, the dotted line in FIG. 4B is a dotted line for illustrating the light guide plate 50 and the LED element 34 to help explain the cross-sectional structure.

5A and 5B are plan and side cross-sectional views respectively showing a second application example of a backlight unit including the LED array 30 of the first form and the cover bottom 60 of the second form according to the present invention described above. In particular, the LED array 30 and the cover bottom 60 is shown mainly in the form of fastening.

5B and 5B, which are cross-sectional views taken along line BB of FIG. 5A, the cover bottom 60 and the liquid crystal panel (not shown) are disposed on the upper portion and a light guide panel 70 in FIG. 5B is placed therein. In performing the fastening between the LED arrays 30 according to the present invention, a fitting hole (62 of FIG. 5B) is formed in a partial region of the cover bottom 60. In this case, the cover bottom 60 of the second type which is fastened to the LED array 30 has an end shape of the letter “c”, and the fitting hole 62 is a protrusion for fitting the LED array 30. It is formed on the ceiling surface of the cover bottom 60 so that the 36 is inserted into the letter 'C' of the cover bottom 60 and then pushed upward.

In addition, the fitting hole 62 has a shape, size, and number depending on the shape, size, and number of the fitting protrusions 36 to fit the fitting protrusions 36 of the LED array 30. It is natural to be decided too.

For reference, the dotted line in FIG. 5B is a dotted line for illustrating the light guide plate 70 and the LED element 34 to help explain the cross-sectional structure.

6A and 6B are a plan view and a side view showing a second form of the LED array 100 for a backlight unit according to the present invention, respectively, with a plurality of LED elements 104 spaced apart on the LED mounting substrate 102 at regular intervals. The configured form is shown.

At this time, the LED mounting substrate 102 is made of a high thermal conductivity metal PCB (Metal PCB).

6B, a plurality of fitting protrusions 1066 may be formed on the rear surface of the LED mounting substrate 102, and the fitting protrusions 106 may be formed on the LED mounting substrate 102. It is preferable to comprise it integrally.

The fitting protrusion 106 is configured to fasten the LED array 100 to a display device, and more particularly, to form a fitting hole (described below) at a cover bottom to the LED array 100 in the display device. ) Can standardize the configuration position, and also improve the assembly performance and improve the problems such as the occurrence of the display panel due to the assembly failure.

In addition, the shape of the fitting protrusion 106, as shown in the side view of the LED array 100 as shown in FIG. have.

7A and 7B are plan and side cross-sectional views, respectively, showing a third application example of a backlight unit including the LED array 100 and the cover bottom 110 of the second type according to the present invention already described above, in particular the LEDs; The fastening form between the array 100 and the cover bottom 110 is shown mainly.

Referring to FIG. 7B, which is a cross-sectional view taken along line CC of FIGS. 7A and 7A, a cover bottom 110 in which a liquid crystal panel (not shown) is positioned and a light guide panel 120 in FIG. In performing the fastening between the LED arrays 100 according to the present invention, fitting holes (112 of FIG. 7B) are formed in some sidewall surfaces of the cover bottom 110. In this case, the cover bottom 110 which is fastened to the LED array 100 has an end portion of a “b” shape, and the fitting hole 112 fits the fitting protrusion 106 of the LED array 100. It is formed on the side wall surface of the cover bottom 110 to be coupled by sliding in the lateral direction.

In addition, the fitting hole 112 has a shape, size, and number depending on the shape, size, and number of the fitting protrusion 106 to fit the fitting protrusion 106 of the LED array 100. It is natural to be determined.

For reference, the dotted line in FIG. 7B is a dotted line for illustrating the light guide plate 120 and the LED device 104 to help explain the cross-sectional structure.

By forming the fitting holes 42 or 62 or 112 in the cover bottom 40 or 60 or 110 as described above, the position at which the LED array 30 or 100 is to be coupled is determined in advance. Naturally, the assemblability is greatly improved. In addition, since the configuration position of the LED device on the LED mounting board can be set in advance, assembly is performed by setting an optimal position where hot spots, which are only visible near bright LEDs or LED devices, are set so that the LED device is positioned. There is an advantage that the deterioration of the image display quality due to the deviation can be prevented.

The LED array and backlight unit of the present invention as described above improves the assemblability in the liquid crystal display device using the LED element, and also eliminates the assembly deviation to the optimum position by blocking the possibility of deterioration of image display quality in advance. Providing high quality display quality enhances product competitiveness.

Claims (7)

LED element; The LED element is mounted, the LED mounting substrate on which the fitting protrusion is formed LED array comprising The method according to claim 1, LED fitting, characterized in that formed on the side or back of the LED mounting substrate The method according to claim 1, LED fitting, characterized in that consisting of one of the planar shape of the rectangular, semi-circular, triangular shape The method according to claim 1, The LED mounting substrate is an LED array, characterized in that the metal PC An LED array including an LED element and an LED mounting board on which the LED element is mounted and a fitting protrusion is formed; Cover bottom formed with a fitting hole for fitting the fitting protrusions of the LED array Backlight unit comprising a The method according to claim 5, The fitting hole is a backlight unit, characterized in that formed on one of the inner bottom surface, ceiling surface, side wall surface of the cover bottom The method according to claim 5, An end portion of the cover bottom is formed of a "b" or "c" shaped backlight unit, characterized in that

Images