KR20090060052A - Liquid crystal display device - Google Patents

Abstract

A liquid crystal display device is provided to realize the strong structure against the external impact by stably fixing an optical sensor and a flexible printed circuit board in which the optical sensor is mounted, to a main support. A liquid crystal display device comprises a liquid crystal panel(101), the first printed circuit board(102), a plurality of first flexible printed circuit boards(103), a light source(104), a main support(105), the first coupling groove(105b), an optical sensor(106) and the second flexible printed circuit board(107). On the first printed circuit board, a liquid crystal panel driving part for operating the liquid crystal panel is mounted. The first flexible printed circuit boards connect the liquid crystal panel with the first printed circuit board. The main support receives the light source and liquid crystal panel.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display including a light sensor for detecting a brightness of light emitted from a light source and a light brightness control module for controlling brightness by using brightness data received from the light sensor. The present invention relates to a liquid crystal display device in which the optical sensor is stably fixed to the main support and has a structure resistant to external shocks.

BACKGROUND ART In general, liquid crystal display devices have tended to be gradually widened due to their light weight, thinness, and low power consumption. Accordingly, the liquid crystal display device is widely used as a portable computer such as a notebook PC, office automation equipment, audio / video equipment, and the like.

In general, a liquid crystal display device displays a desired image on a screen by adjusting the amount of light transmitted according to image signals applied to a plurality of control switching elements arranged in a matrix.

The liquid crystal display device is a liquid crystal in which a color filter substrate as an upper substrate and a thin film transistor array substrate as a lower substrate face each other and a liquid crystal layer is filled between the two substrates. And a driving unit for supplying scan signals and image information to the liquid crystal panel to operate the liquid crystal panel.

The liquid crystal display device having the above configuration is a non-light emitting device that does not emit light by itself compared to a cathode ray tube (CRT) or a light emitting diode (LED), and thus, an LCD There is a need for a backlight assembly that provides light to the panel.

Light sources generating light in the backlight assembly include a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), and an LED.

Conventionally, a cold cathode fluorescent lamp is mainly used as a light source of a backlight assembly. However, recently, a liquid crystal display device adopting an LED, which is advantageous in power consumption, weight, and luminance, as a light source of a backlight assembly is being used in accordance with the trend toward miniaturization, thinness, and light weight of a liquid crystal display device. Growing.

In the backlight assembly having the LED as a light source as described above, red, green, and blue (hereinafter, R, G, B) LEDs are alternately arranged, and light of R, G, B emitted from the R, G, B LEDs. Silver has a characteristic of being supplied to the liquid crystal panel after being converted into uniform white light by mixing.

However, the LED as described above has a problem that the characteristics of the emitted light changes over time. In particular, the LED generates a lot of heat during the driving process, there is a problem that the brightness is lowered by this heat, and the uniform white light desired because the degree of the brightness of the light emitted by each of the R, G, B LEDs is different. There has been a problem that can not be obtained.

Accordingly, in order to solve the above problem, in a liquid crystal display device in which the LED is provided as a light source, an optical sensor for detecting the luminance of light emitted from the LED and power supplied to the LED using the luminance data received from the optical sensor are used. A liquid crystal display device having a light brightness control module including a light brightness control unit for controlling brightness by adjusting the brightness has been proposed.

Hereinafter, a conventional liquid crystal display device will be described with reference to the accompanying drawings.

As shown in FIG. 1, a conventional liquid crystal display device includes a first printed circuit board (PCB) mounted with a liquid crystal panel 1 and an LED (not shown) for supplying light to the liquid crystal panel 1. circuit board 4, a light guide plate 8 for guiding light emitted from the LED toward the liquid crystal panel 1, and a light guide plate 8 for converting light emitted from the light guide plate 8 to be supplied to the liquid crystal panel 1 An optical sheet 10, a reflector 9 for reflecting light exposed to the lower part of the light guide plate 8 in the direction of the liquid crystal panel 1, the liquid crystal panel 1, a first printed circuit board 4, A main support 5 for accommodating the light guide plate 8, the optical sheet 10, and the reflecting plate 9, and an upper cover 11 that is combined with the main support 5 and wraps around the edge of the upper surface of the liquid crystal panel 1. It is composed.

2, a hole 5b is formed at one side of the lower portion of the main support 5 so that the light sensor 6 corresponds to the light sensor 6 toward the inside of the lower cover.

The optical sensor 6 is mounted on a first flexible printed circuit board (FPCB) 7, wherein the first flexible printed circuit board 7 is disposed on the rear surface of the main support 5 and bonded. It is fixed by the attachment of the tape 12.

A second printed circuit board 2 having a driving unit for driving the liquid crystal panel 1 is disposed below the main support 5, and the liquid crystal panel 1 and the second printed circuit board 2 are It is connected by a plurality of second flexible printed circuit boards 3 arranged at predetermined intervals.

The second printed circuit board 2 is provided with an optical luminance control unit (not shown) for controlling the luminance by adjusting the power supplied to the LED using the luminance data received from the optical sensor 6. Here, the optical sensor 6 and the brightness control unit forms a brightness control module.

In addition, a plurality of guide protrusions 5a are formed outside the main support 5 to guide and protect the second flexible printed circuit board 3 between the second flexible printed circuit board 3. .

In the liquid crystal display having the structure as described above, the fixing tape of the first flexible printed circuit board 7 on which the optical sensor 6 is mounted is attached to a portion of the rear surface of the first flexible printed circuit board 7. It is made only by 12), the degree of fixation is not strong, the first flexible printed circuit board (7) flows when the impact from the outside, the optical sensor (6) also flows due to the light sensor ( A problem occurs that an error occurs in the detection data of 6).

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display including a light sensor for detecting a brightness of light emitted from a light source and a light brightness control module for controlling brightness by using brightness data received from the light sensor. The present invention relates to a liquid crystal display device having a structure in which the flexible printed circuit board on which the optical sensor and the optical sensor are mounted is stably fixed to the main support, and has a structure resistant to external impact.

Liquid crystal display device according to an embodiment of the present invention for achieving the above object, the liquid crystal panel; A first printed circuit board on which a liquid crystal panel driver is mounted to drive the liquid crystal panel; A plurality of first flexible printed circuit boards connecting the liquid crystal panel and the first printed circuit board and arranged at a predetermined interval; A light source for supplying light to the liquid crystal panel; A main support having the light source and the liquid crystal panel therein and having a plurality of guide protrusions disposed between the plurality of first flexible printed circuit boards; A first fastening groove provided in a portion of the main support corresponding to the guide protrusion; An optical sensor fastened to the first fastening groove; A second flexible printed circuit board mounted with the optical sensor and disposed along an outer surface of the main support; It is configured to include.

In the liquid crystal display device according to the present invention having the above-described configuration, the second fastening groove of the second flexible printed circuit board is fastened to the guide protrusion of the main support, thereby primarily fixing the second flexible printed circuit board. As the first printed circuit board is disposed to cover the second flexible printed circuit board, secondary fixing of the second flexible printed circuit board is performed, and the optical sensor extends from an area of the second flexible printed circuit board to form a second fastening groove. Is mounted to the first fastening groove of the main support, thereby tertiary fixing of the second flexible printed circuit board is performed, and the area where the optical sensor is mounted on the second flexible printed circuit board forms the first fastening groove. And the fourth fixing is achieved by bonding with the adhesive member, and the flow of the second flexible printed circuit board is effectively prevented, and the second flexible printed circuit board is mounted on the second flexible printed circuit board. There is also the effect that flow protection of an optical sensor.

Therefore, the optical sensor mounted on the second flexible printed circuit board and the second flexible printed circuit board does not flow even if the liquid crystal display flows during the user's use after the manufacturing of the liquid crystal display is completed, so that the optical sensor has accurate luminance data. Can be detected.

In the liquid crystal display according to the present invention having the above-described configuration, the first fastening groove for fastening the optical sensor is formed so as to correspond to the area where the guide protrusion provided in the main support is formed. 2 Even if the fastening groove is formed, there is an advantage of not harming the robustness of the main support. In addition, since it is not necessary to increase the thickness of the main support in order to form the first fastening groove, there is an advantage that can meet the recent trend of light weight and thinning of the liquid crystal display device.

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

3 to 7, a liquid crystal display according to a preferred embodiment of the present invention includes a liquid crystal panel 101; A printed circuit board 102 mounted with a liquid crystal panel driver for driving the liquid crystal panel 101; A plurality of first flexible printed circuit boards 103 connecting the liquid crystal panel 101 and the first printed circuit board 102 and arranged at a predetermined interval; A light source 104 supplying light to the liquid crystal panel 101; The main support 105 having the light source 104 and the liquid crystal panel 101 therein and a plurality of guide protrusions 105b disposed between the plurality of first flexible printed circuit boards 103 on an outer surface thereof. ); A first fastening groove 105b provided in a portion of the main support 105 corresponding to the guide protrusion 105b; An optical sensor 106 fastened to the first fastening groove 105b; A second flexible printed circuit board 107 on which the photosensor 106 is mounted and disposed along an outer surface of the main support 105; It is configured to include.

In addition, the second flexible printed circuit board 107 is fastened to the first fastening groove 105b together with the optical sensor 106 in a region where the optical sensor 106 is mounted, and the second flexible printed circuit board 107. ) Is bonded by an adhesive member (not shown) to an area of the first fastening groove 105b that forms an area of the first fastening groove 105b. In addition, the second flexible printed circuit board 107 is formed with at least a second fastening groove 107a having a size fastened to the first fastening groove 105b.

Each component of the liquid crystal display according to the preferred embodiment of the present invention having the above configuration will be described in detail as follows.

As shown in FIG. 3, the liquid crystal panel 101 includes a color filter substrate 101a as an upper substrate and a thin film transistor array substrate 101b as a lower substrate, and a liquid crystal layer (not shown) between the two substrates. Is formed.

The liquid crystal display according to the preferred embodiment of the present invention includes a first printed circuit board (PCB) 102 mounted with a liquid crystal panel driver for driving the liquid crystal panel 101. In addition to the liquid crystal panel driver, the printed circuit board 102 may include a light source driver for driving the light source 104.

The first printed circuit board 102 is connected to the liquid crystal panel 101 through a first flexible printed circuit board (FPCB) 103, and the first flexible printed circuit board 103 is predetermined. Multiple dogs are provided at intervals.

Here, the data driver, which is a component of the liquid crystal panel driver, may be directly mounted on the first flexible printed circuit board 103.

A light source 104 is disposed below the liquid crystal panel 101, and the liquid crystal panel 101 receives light from the light source 104 to display a screen.

The light source 104 included in the liquid crystal display according to the present invention is a light emitting diode (LED) 104b formed at one side of the lower region of the liquid crystal panel 101, and the LED 104b. ) Is mounted on the second printed circuit board 104a, but the present invention is not limited thereto, and the light source 104 includes LEDs formed on the entire lower region of the liquid crystal panel 101. It is possible.

3, a light guide plate 108 is provided at one side of the light source 104 to guide the light emitted from the light source 104 toward the liquid crystal panel 101.

In addition, a lower portion of the light guide plate 108 is provided with a reflective sheet 109 for reflecting light leaking into the lower portion of the light guide plate 108 into the light guide plate 108, and the light guide plate 108 is disposed above the light guide plate 108. The optical sheet 110 for converting the light emitted from the supply to the liquid crystal panel 101 is provided.

Referring to FIG. 3, a liquid crystal display according to an exemplary embodiment of the present invention includes the liquid crystal panel 101, a light source 104, a light guide plate 108, a reflective sheet 109, and an optical sheet 110 therein. The main support 105 is provided, and the outer side of the main support 105 is provided with an upper cover 111 coupled to the main support 105 to surround the upper edge of the liquid crystal panel 101.

3 and 6, a plurality of guide protrusions 105a are formed on the outer surface of the main support 105 between the plurality of first flexible printed circuit boards 103.

The guide protrusion 105a formed to protrude from the outer surface of the main support 105 has a predetermined space in the interior of the main support 105 and the upper cover 111 by the end of the guide protrusion 105a contacting the surface of the upper cover 111. The width of the space is preferably equal to the thickness of the first flexible printed circuit board 103 or larger than the thickness of the first flexible printed circuit board 103. That is, the guide protrusion 105a of the main support 105 is formed to protrude with a thickness equal to the thickness of the first flexible printed circuit board 103 or greater than the thickness of the first flexible printed circuit board 103. desirable. As a result, the first flexible printed circuit board 103 is prevented from being destroyed by pressure.

3 and 7, a first fastening groove 105b for fastening the optical sensor 106 is formed at a portion corresponding to the guide protrusion 105a in the inside of the main support 105.

The first fastening groove 105b has a shape and a size corresponding to the region in which the optical sensor 106 is mounted and the optical sensor 106 in the second flexible printed circuit board 107. At this time, the first fastening groove 105b is preferably the same size as the region in which the optical sensor 106 is mounted in the second flexible printed circuit board 107 and the optical sensor 106. In this case, the optical The sensor 106 and the second flexible printed circuit board 107 will be firmly fixed in the first fastening groove 105b.

Since the first fastening groove 105b is formed at a position corresponding to the guide protrusion 105a inside the main support 105, the main support 105 may be formed even when the first fastening groove 105b is formed in the main support 105. ) Has the advantage of not harming the robustness.

The optical sensor 106 disposed in the first fastening groove 105b is a means for detecting light from the light source 104 and is a light intensity controller (not shown) mounted on the first printed circuit board 102. Together with the brightness control module.

The brightness control module detects the brightness of red, green, and blue (hereinafter, R, G, and B) light emitted from the light source 104, that is, the LED 104b, after the light sensor 106 detects the brightness. By transmitting the data to the brightness control unit to adjust the power supplied to the LED to control the brightness of the R, G, B light so that the R, G, B light can be mixed and become white light.

3 and 4, the optical sensor 106 as described above is mounted on the second flexible printed circuit board 107, with respect to the second flexible printed circuit board 107. The following description is made with reference to 7.

In FIG. 4, only the second flexible printed circuit board 107 illustrated in FIG. 3 is enlarged and illustrated in detail. In FIG. 5, the first printed circuit board 102 and the first flexible printed circuit board 103 are connected to the main support 105. ) Is not assembled and only the second flexible printed circuit board 107 is assembled. In FIG. 6, a main printed circuit board 107 as well as the first printed circuit board (107) are connected to the main support 105. 102 and the first flexible printed circuit board 103 are shown after being assembled to the main support 105. In FIG. 7, the second flexible printed circuit board 107 is assembled to the main support 105. As shown in FIG. The figure shows the figure seen from the inside of the main support 105.

5 to 7, the second flexible printed circuit board 107 is formed on the top, outer side, and back of the main support 105 starting with the first fastening groove 105b of the main support 105. The ends thereof are arranged to be connected to each other and bent along the surface of the first printed circuit board 102 to be connected to the first printed circuit board 102. At this time, the second flexible printed circuit board 107 and the first printed circuit board 102 shown in FIGS. 5 and 6 are not shown in detail a connector for connecting to each other, but the second flexible printed circuit board ( 107 and the first printed circuit board 102 are electrically connected through connecting means such as a connector. Thus, the second flexible printed circuit board 107 receives the luminance data detected by the optical sensor 106 as a first print. The brightness of the printed circuit board 102 is transmitted to the brightness control unit, and the brightness control unit removes the brightness of the light source 104, that is, the LED 104b using the brightness data.

5, the second flexible printed circuit board 107 is provided with a second fastening groove 107a having a size and shape fastened to at least the guide protrusion 105a of the main support 105. As the second fastening groove 107a is fastened to the guide protrusion 105b of the main support 105, the second flexible printed circuit board 107 is first fixed to the main support 105, and then, as shown in FIG. 6. As shown in the drawing, when the first flexible printed circuit board 103 and the first printed circuit board 102 are assembled to the main support 105, the second flexible printed circuit board 107 is connected to the first printed circuit board 102. Secondary fixing is achieved by being arranged to cover.

In addition, an area extending from the area forming the second fastening groove 107b formed in the second flexible printed circuit board 107 and mounted with the optical sensor 106 is, as mentioned above, the main support 105 of the main support 105. The third fixing is achieved by being fastened to the first fastening groove 105b. As described above, the region in which the optical sensor 106 is mounted in the second flexible printed circuit board 107 is bonded by an area constituting the first fastening groove 105b and an adhesive member (not shown), thereby performing the fourth fixing.

As described above, since the second flexible printed circuit board 107 is fixed from the first to the fourth, the second flexible printed circuit board 107 is in the process of being used by the user after the manufacturing of the liquid crystal display device is completed. Since it does not flow, the flow of the optical sensor 106 mounted on the second flexible printed circuit board 107 is also prevented.

3 to 7 illustrate that the second flexible printed circuit board 107 is disposed at a position corresponding to the guide protrusion 105a positioned relatively in the center of the guide protrusion 105a formed on the main support 105. The present invention is not limited thereto, and the second flexible printed circuit board 107 may have guide protrusions 205a positioned at edges of the guide protrusions 205a of the main support 205 as shown in FIGS. 8 and 9. The arrangement area, such as a place corresponding to), may be various examples without departing from the gist of the present invention. 8 and 9, the second flexible printed circuit board 207 is disposed at a position corresponding to the guide protrusion 205a positioned at the edge of the guide protrusion 205a formed on the main support 205. A first fastening groove will be formed in an area corresponding to the guide protrusion 205a of the main support, and an optical sensor 206 will be disposed in the first fastening groove, and the second flexible printed circuit board will be fitted to the arrangement position. The shape of 107 will also be a part deleted in comparison with that shown in FIG.

1 is an exploded perspective view showing a conventional general liquid crystal display device.

FIG. 2 is a cross-sectional view illustrating a region, in which an optical sensor is formed, cut from an upper side to a lower side in the general liquid crystal display of FIG. 1. FIG.

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

4 is an enlarged perspective view illustrating in detail a second flexible printed circuit board of FIG. 3;

FIG. 5 is a view showing the liquid crystal display of FIG. 3 as viewed from the rear side, wherein the second flexible printed circuit board is fastened to the main support. FIG.

FIG. 6 is a view of the liquid crystal display of FIG. 3 viewed from the back, in which a first flexible printed circuit board and a first printed circuit board are fastened to a main support, including a second flexible printed circuit board. Perspective view.

FIG. 7 is a view showing the liquid crystal display of FIG. 3 as viewed from above, wherein the second flexible printed circuit board is fastened to the main support, and only the reflective sheet is accommodated in the main support.

8 and 9 are perspective views showing another example of the present invention.

** Description of the symbols for the main parts of the drawings **

101 liquid crystal panel 102 first printed circuit board

103: first flexible printed circuit board 104: light source

105: main support 105a: guide protrusion

105b: first fastening groove 106: optical sensor

107: second flexible printed circuit board

Claims (7)

A liquid crystal panel; A first printed circuit board on which a liquid crystal panel driver is mounted to drive the liquid crystal panel; A plurality of first flexible printed circuit boards connecting the liquid crystal panel and the first printed circuit board and arranged at a predetermined interval; A light source for supplying light to the liquid crystal panel; A main support having the light source and the liquid crystal panel therein and having a plurality of guide protrusions disposed between the plurality of first flexible printed circuit boards; A first fastening groove provided in a portion of the main support corresponding to the guide protrusion; An optical sensor fastened to the first fastening groove; A second flexible printed circuit board mounted with the optical sensor and disposed along an outer surface of the main support; Liquid crystal display device comprising a. The liquid crystal display of claim 1, wherein the guide protrusion protrudes at least the same thickness as that of the first flexible printed circuit board. The second flexible printed circuit board of claim 1, wherein an area in which the optical sensor is mounted is fastened to the first fastening groove together with the optical sensor. And the second flexible printed circuit board is bonded by an adhesive member to a region of the first coupling groove formed in the first coupling groove. The liquid crystal display device of claim 1, wherein the second flexible printed circuit board is provided with a second fastening groove having a size at least engaged with the guide protrusion. The light source of claim 1, wherein the light source includes a light emitting diode and a second printed circuit board on which the light emitting diode is mounted. And the optical sensor detects the luminance of the light emitting diode. The method of claim 1, wherein the first printed circuit board is disposed on the back of the main support to cover the second flexible printed circuit board, The second flexible printed circuit board is disposed to extend from the second fastening groove of the main support to the upper surface, the outer side surface, and the rear surface of the main support, and an end thereof is connected to the first printed circuit board. LCD display device. The liquid crystal display device according to claim 5, wherein the first printed circuit board is provided with a light brightness controller which controls the brightness of the light source by using the brightness of the light.

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