KR20080078224A - Liquid crystal display module - Google Patents

Abstract

An LCD(Liquid Crystal Display) module is provided to improve the uniformity of luminance by additionally arranging white LEDs(Light-Emitting Diodes) at edges of a LED package array instead of red, green, and blue LEDs and respectively driving them. An LCD module comprises a liquid crystal panel(131) and an LED package array(103). The LED package array, arranged below the liquid crystal panel, includes a plurality of LED packages(105) and a plurality of white LEDs(107). Each of the LED packages consists of a red LED, a green LED, and a blue LED. The white LEDs are arranged at edges of the LED package array. In this case, the white LEDs can be arranged at upper/lower edges or right/left edges of the LED package array.

Description

Liquid Crystal Display Module {LIQUID CRYSTAL DISPLAY MODULE}

1 is a cross-sectional view schematically showing the structure of a backlight unit of a liquid crystal display according to the prior art.

2 is a cross-sectional view showing the configuration of an LED module of a backlight unit of a liquid crystal display device according to the prior art, and an enlarged cross-sectional view of an "A" part.

3 is a plan view showing the configuration of the LED module of the backlight unit of the liquid crystal display according to the prior art.

Figure 4 is a photograph showing the color mixing state in the R / G / B LED module of the backlight unit according to the prior art.

5 is a cross-sectional view schematically showing the structure of a backlight unit of a liquid crystal display according to the present invention.

Fig. 6 is a sectional view showing the configuration of the LED module of the backlight unit of the liquid crystal display device according to the present invention, and is an enlarged cross-sectional view of a portion “B”.

7 is a plan view showing the configuration of the LED module of the backlight unit of the liquid crystal display according to the present invention.

8 is a plan view showing the configuration of the LED module of the backlight unit of the liquid crystal display device according to the present invention, an enlarged plan view of the "B" portion that is the edge of the LED module of FIG.

9 is a first embodiment of the LED module of the backlight unit of the liquid crystal display device according to the present invention, the top view of the LED module in which the white LED is further arranged in the upper and lower edge of the LED package array.

FIG. 10 is a plan view of an LED module in which a white LED is further arranged at left and right edges of an LED package array as a second embodiment of a LED module of a backlight unit of a liquid crystal display according to the present invention; FIG.

Figure 11 is a third embodiment of the LED module of the backlight unit of the liquid crystal display device according to the present invention, a top view of the LED module in which the white LED is further arranged in each corner of the LED package array.

-Code description of main parts of drawing-

100: backlight unit 101: lower frame

103: LED package array 105: LED package

105a: Red LED 105b: Green LED

105c: Blue LED 107: White LED

121: upper frame 131: liquid crystal panel

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display module capable of improving color uniformity by arranging white LEDs at edge portions of an LED package array in a backlight unit of a liquid crystal display device.

TFT-LCD, which has emerged as a core display of digital multimedia devices, cannot emit light on its own, so an external light source is required. The back light unit is a device that provides this light.

On the other hand, as a light source of the backlight unit for medium and large size liquid crystal display devices, a cold cathode lamp (hereinafter referred to as CCFL) which is easy to manufacture small and inexpensive is used.

However, such a cold cathode lamp (CCFL) is required to apply a high voltage to the anode, and due to the principle of generating visible light by exciting the UV wavelength, the color reproduction range, which is an important characteristic of the display device, is defined by the National Television System Committee. NTSC) is somewhat weak.

In addition, when manufacturing a backlight unit using a cold cathode lamp (CCFL), it is necessary to control the driving voltage of several hundred volts, so that an expensive inverter circuit is required separately, and the use of a CCFL that uses mercury in accordance with international environmental regulations It is becoming a problem.

Accordingly, the adoption of a backlight unit using a light emitting diode (LED) as a light source has recently increased. The LED light source has a long lifespan and not only can manufacture a display device of NTSC 120 or more, but also can be implemented only by controlling a constant current of several DC to several tens of volts.

LED is applied as a light source of a backlight unit for a small liquid crystal display device currently used in a mobile phone and a mobile, and research is being actively conducted to apply the backlight unit for a large liquid crystal display device.

The backlight unit structure of the liquid crystal display according to the related art to which the LED is applied will be described with reference to FIGS. 1 to 4.

1 is a cross-sectional view schematically illustrating a structure of a backlight unit of a liquid crystal display according to the related art.

2 is a cross-sectional view showing the configuration of the LED module of the backlight unit of the liquid crystal display device according to the prior art, and is an enlarged cross-sectional view of the "A" part.

3 is a plan view illustrating a configuration of an LED module of a backlight unit of a liquid crystal display according to the related art.

4 is a photograph showing a color mixing state in the R / G / B LED module of the backlight unit according to the prior art.

Referring to FIG. 1, the liquid crystal display according to the related art includes a liquid crystal panel 31 and a backlight unit 10 for supplying light toward the liquid crystal panel 31.

Here, the liquid crystal panel 31 is an electronic device that changes and transmits various electrical information generated by various devices into visual information by using a change in transmittance of the liquid crystal according to an applied voltage. The liquid crystal panel 31 is a display device of a computer monitor and a TV. Is used.

In addition, the backlight 10 includes a lower frame 11 and an upper frame 21 and an LED package array 13.

Here, the lower frame 11 and the upper frame 21 serves as a support, for example, the upper frame 21 is applied to the diffusion plate, diffusion sheet, prism sheet, protective sheet, etc. are assembled and applied. The lower frame 11 is made of aluminum alloy as a main material for heat generation.

2 and 3, the LED package array 13 is a red (R) LED (15a), green (G) LED (15b), blue (B) LED (15c) chip consisting of a single package LED In order to use the package 15 as a light source module of the liquid crystal panel 31, the plurality of LED packages 15 may be used on a printed circuit board (not shown) to display an effective display area of the liquid crystal panel 31 and the backlight 10. It is arranged in a form arranged in accordance with.

That is, the LED package array 13 is packaged by arranging red (R) LED, green (G) LED, and blue (B) LED chips having the same size or different sizes in a single package. White light is realized by adjusting the amount of light with each unique color coming from the R / G / B LED chip in the package at a constant rate through the drive circuit.

However, according to the liquid crystal display module of the liquid crystal display device according to the prior art, in the case of configuring the LED backlight unit by arranging and packaging the red (R), green (G), and blue (B) LED chips in a certain order, FIG. As in 4, the light reflected from the mold structure constituting the backlight unit is not sufficiently mixed color is reflected.

In addition, in the liquid crystal display module of the liquid crystal display device according to the prior art, when sufficient color mixing is not performed in the vicinity of the mold structure, color smear occurs on the screen of the backlight and the liquid crystal panel, and thus, it is impossible to provide clear image quality.

The reason why the light reflected from the mold structure is not sufficiently mixed is that sufficient mixing gap between the LED package chip and the mold structure (for example, reflector and side support) is ensured. This is a phenomenon that occurs when a sufficient mixing gap between the LED package chip and the mold structure is secured, and a dark edge occurs at the edge of the screen.

That is, the conventional red (R), green (G), and blue (B) LED chips are arranged in a predetermined order and packaged so that they are not optimized in terms of color mixing.

Therefore, according to the liquid crystal display module according to the prior art as described above, in addition to the advantages of the eco-friendly and high color reproduction rate of the LED, when the R / G / B individual color light source is applied, if a sufficient white mixing gap is not secured, color stain occurs You will not be able to express vivid picture quality.

In particular, the light reflected from the backlight mold structure (e.g., reflector, side support) at the outside of the backlight and the edge of the LCD module in the arrangement of the LED package array consisting only of the existing R / G / B LED package Is not sufficiently white mixed and color staining occurs.

In addition, in order to mix the uniform white color of the LED backlight, the mixing gap should be maximized to maximize the color mixing, but there is a limit in increasing the mixing gap in order to slim the product concept.

Accordingly, the present invention has been made to solve the above problems of the prior art, an object of the present invention is to increase the edge of the LED package array without increasing the mixing gap of the red (R), green (G), blue (B) LED The present invention provides a liquid crystal display module for improving color uniformity by additionally arranging white LEDs in a portion.

Liquid crystal display module according to the present invention for achieving the above object is a liquid crystal panel; And a plurality of LED packages and a plurality of white LEDs disposed under the liquid crystal panel, the plurality of LED packages including red (R), green (G), and blue (B) LEDs, and the plurality of white LEDs arranged at an edge portion thereof. It characterized in that it comprises a package array.

Liquid crystal display module according to the present invention for achieving the above object is a liquid crystal panel; And a plurality of LED packages and a plurality of white LEDs disposed under the liquid crystal panel, the plurality of LED packages including red (R), green (G), and blue (B) LEDs, and the plurality of white LEDs arranged at an edge portion thereof. And a backlight unit having a package array.

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

5 is a cross-sectional view schematically illustrating a structure of a backlight unit of a liquid crystal display according to the present invention.

6 is a cross-sectional view showing the configuration of the LED module of the backlight unit of the liquid crystal display according to the present invention, and is an enlarged cross-sectional view of the "B" part.

7 is a plan view showing the configuration of the LED module of the backlight unit of the liquid crystal display according to the present invention.

FIG. 8 is a plan view illustrating a configuration of an LED module of a backlight unit of a liquid crystal display according to the present invention, and is an enlarged plan view of a portion “B” of an edge of the LED module of FIG. 7.

Referring to FIG. 5, the liquid crystal display module according to the present invention includes a liquid crystal panel 131 for displaying a desired image and a backlight unit 100 for supplying light toward the liquid crystal panel 131.

The liquid crystal panel 131 is an electronic device that transmits various electrical information generated by various devices to visual information by using a change in transmittance of liquid crystal according to an applied voltage. The liquid crystal panel 131 is a display device of a computer monitor and a TV. Is used.

Although not shown in the figure, the liquid crystal panel 31 includes a TFT array substrate (not shown) with a TFT array, a color filter substrate (not shown) with a color filter array, and a liquid crystal layer (not shown) formed between these substrates. It is composed of

Here, the TFT array substrate (not shown) includes a plurality of gate lines (not shown) and a plurality of data lines (not shown) arranged to cross each other, and a plurality of gate lines (not shown) and a plurality of data lines. A thin film transistor (not shown) formed in an area where the gate driving circuit part and the data driving circuit part connected to each other (not shown) and the plurality of gate lines (not shown) and the data line (not shown) intersect and are provided for each unit pixel And a pixel area defined in an area where the plurality of gate lines and the plurality of data lines cross each other.

In addition, the color filter substrate (not shown) is formed with a black matrix (not shown) for preventing light from being transmitted to portions except for each unit pixel region, and a color filter layer through which light is transmitted around the black matrix. (Not shown) is formed.

A liquid crystal layer (not shown) is formed between the color filter substrate (not shown) and the TFT array substrate (not shown).

In addition, the backlight unit 100 includes a lower frame 101 and an upper frame 121 and an LED package array 103.

Here, the lower frame 101 and the upper frame 121 serves as a support, for example, the upper frame 121 is applied by applying a diffusion plate, a diffusion sheet, a prism sheet, a protective sheet, etc., The lower frame 101 is formed of aluminum alloy or the like as a main material for heat generation.

On the other hand, although not shown in the drawing, the backlight unit 100 supports a reflector and an LED package array to increase light efficiency by reflecting the light from the LED other than the upper and lower frames to the liquid crystal panel 131 side. It is equipped with side support.

6, 7 and 8, the LED package array 103 includes a red (R) LED 105a, a green (G) LED 105b, and a blue (B) LED 105c chip. In order to use the plurality of LED packages 105 and the plurality of white LEDs 107 formed as one package for the light source module of the liquid crystal panel 131, the plurality of LED packages 105 may include a printed circuit board (not shown). On the liquid crystal panel 131 and the backlight unit 100 are arranged in a form arranged in accordance with the effective display area.

Here, the red (R) LED 105a, the green (G) LED 105b, and the blue (B) LED 105c constituting the LED package array 103 are configured in one package. The plurality of LED packages 105 are arranged in accordance with a portion of the effective display area of the liquid crystal panel 131 and the backlight unit 100.

That is, the plurality of LED packages 105 including the red (R) LED 105a, the green (G) LED 105b, and the blue (B) LED 105c may include the liquid crystal panel 131 and the backlight unit 100. Are arranged at regular intervals in the entire effective display area except for the edge part.

In addition, the plurality of white LEDs 107 constituting the LED package array 103 are selectively arranged at edge portions of the effective display area of the liquid crystal panel 131 and the backlight unit 100.

That is, the white LED 107 constituting the LED package array 103 is further arranged in the nearest position to the mold structure (for example, the reflector and the side support) constituting the backlight unit, so that the color at the outside of the screen This can compensate for the lack of mixing.

In addition, the LED package array 103 is packaged by arranging red (R), green (G), and blue (B) LED chips having the same size or different sizes in one package in a predetermined order. White) light can be realized by adjusting the amount of light with each unique color coming out of the RGB chip in the package at a constant rate through the driving circuit.

In addition to maximizing color mixing in the LED arrangement of the present invention, the white LEDs 107 may be individually driven to improve luminance uniformity.

Meanwhile, a first embodiment of a liquid crystal display module according to the present invention will be described with reference to FIG. 9.

FIG. 9 is a plan view of an LED module in which white LEDs are further arranged at upper and lower edge portions of an LED package array as a first embodiment of a LED module of a backlight unit of a liquid crystal display according to the present invention.

9, the LED package array 203 of the backlight unit of the liquid crystal display according to the first embodiment of the present invention is a red (R) LED (205a), green (G) LED 205b, blue (B) The plurality of LED packages 205 for using a plurality of LED packages 205 and a plurality of white LEDs 207 in which the LED 205c chip is formed in one package for a light source module of a liquid crystal panel (not shown) Is arranged on a printed circuit board (not shown) so as to be aligned with an effective display area of a liquid crystal panel (not shown) and a backlight unit (not shown).

Here, a plurality of LED packages 205 including a red (R) LED 205a, a green (G) LED 205b, and a blue (B) LED 205c constituting the LED package array 203 as one package. ) Is adapted to a portion of the effective display area of the liquid crystal panel (not shown) and the backlight unit (not shown).

That is, the plurality of LED packages 205 including the red (R) LED 205a, the green (G) LED 205b, and the blue (B) LED 205c may include the liquid crystal panel (not shown) and the backlight unit ( All regions of the effective display area (not shown) are arranged at regular intervals except for some edge portions.

In addition, the plurality of white LEDs 207 constituting the LED package array 203 are horizontally disposed at upper and lower edges of edges of the effective display area of the liquid crystal panel (not shown) and the backlight unit (not shown). Are arranged.

That is, the white LED 107 constituting the LED package array 103 is located closest to the mold structure (eg, reflector and side support) constituting the backlight unit (ie, the LED package array 203). By arranging the upper and lower edges of the upper surface in the horizontal direction), it is possible to compensate for the disadvantage that color mixing is not performed at the outer edge of the screen.

In addition, the LED package array 203 according to the first embodiment of the present invention, and also the red (R), green (G), blue (B) LED chip having the same size or different sizes in one package Packaged in order, white light can be implemented by adjusting the amount of light having a unique color coming out of the RGB LED chip in the package at a constant rate through the driving circuit.

Furthermore, in addition to maximizing color mixing in the LED arrangement of the present invention, the luminance uniformity can be improved by operating the white LEDs 207 individually driven.

Meanwhile, a second embodiment of the LED module of the liquid crystal display according to the present invention will be described with reference to FIG. 10.

FIG. 10 is a plan view of an LED module in which white LEDs are additionally arranged at left and right edges of an upper surface of an LED package array as a second embodiment of a LED module of a backlight unit of a liquid crystal display according to the present invention.

10, the LED package array 303 of the backlight unit of the liquid crystal display according to the second embodiment of the present invention is a red (R) LED (305a), green (G) LED 305b, blue (B) The plurality of LED packages 305 to use a plurality of LED packages 305 and a plurality of white LEDs 307 consisting of a single package of LED (305c) chip for the light source module of the liquid crystal panel (not shown) Is arranged on a printed circuit board (not shown) so as to be aligned with an effective display area of a liquid crystal panel (not shown) and a backlight unit (not shown).

Here, a plurality of LED packages 305 including a red (R) LED 305a, a green (G) LED 305b, and a blue (B) LED 305c constituting the LED package array 303 as one package. ) Is aligned with a portion of the effective display area of the liquid crystal panel (not shown) and the backlight unit (not shown).

That is, the plurality of LED packages 305 including the red (R) LED 305a, the green (G) LED 305b, and the blue (B) LED 305c may include the liquid crystal panel (not shown) and the backlight unit (not shown). All regions of the effective display area (not shown) are arranged at regular intervals except for some edge portions.

In addition, the plurality of white LEDs 307 constituting the LED package array 303 may be perpendicular to left and right edges of edges of the effective display area of the liquid crystal panel (not shown) and the backlight unit (not shown). Are arranged.

That is, the white LED 307 constituting the LED package array 303 is located closest to the mold structure (eg, reflector and side support) constituting the backlight unit (ie, the LED package array 303). By arranging in the vertical direction at the left and right edges of the upper surface, it is possible to compensate for the disadvantage that color mixing is not performed at the outer edge of the screen.

In addition, the LED package array 303 according to the second embodiment of the present invention, and also the red (R), green (G), blue (B) LED chip having the same size or different sizes in a single package The white light can be realized by arranging them in order, and adjusting the amount of light having a unique color from the RGB chips in the package at a constant rate through the driving circuit.

Furthermore, in addition to maximizing color mixing in the LED arrangement of the present invention, the luminance uniformity can be improved by operating the white LEDs 207 individually driven.

Meanwhile, a third embodiment of the LED module of the liquid crystal display according to the present invention will be described with reference to FIG. 11.

FIG. 11 is a plan view of an LED module in which white LEDs are additionally arranged at each corner of the LED package array as another embodiment of the LED module of the backlight unit of the LCD according to the present invention.

11, the LED package array 403 of the backlight unit of the liquid crystal display according to the third embodiment of the present invention is a red (R) LED (405a), green (G) LED 405b, blue (B) The plurality of LED packages 405 for using a plurality of LED packages 405 and a plurality of white LEDs 407 in which the LED 405c chip is formed as one package for a light source module of a liquid crystal panel (not shown). Is arranged on a printed circuit board (not shown) so as to be aligned with an effective display area of a liquid crystal panel (not shown) and a backlight unit (not shown).

Here, a plurality of LED packages 405 in which a red (R) LED 405a, a green (G) LED 405b, and a blue (B) LED 405c constituting the LED package array 403 are configured as one package. ) Is aligned with a portion of the effective display area of the liquid crystal panel (not shown) and the backlight unit (not shown).

That is, the plurality of LED packages 405 including the red (R) LED 405a, the green (G) LED 405b, and the blue (B) LED 305c may include the liquid crystal panel (not shown) and the backlight unit (not shown). All regions except for some edges of the effective display area are arranged at regular intervals.

In addition, the plurality of white LEDs 407 constituting the LED package array 403 are arranged only at each corner of edges of the effective display area of the liquid crystal panel (not shown) and the backlight unit (not shown).

That is, the white LED 407 constituting the LED package array 403 is located closest to the mold structure (eg, reflector and side support) constituting the backlight unit (ie, the LED package array 403). By arranging additional corners at each corner of the screen, it is possible to compensate for the disadvantage of not mixing colors at the outside of the screen.

In addition, the LED package array 403 according to the third embodiment of the present invention, and also the red (R), green (G), blue (B) LED chip having the same size or different sizes in one package The white light can be realized by arranging them in order, and adjusting the amount of light having a unique color from the RGB chips in the package at a constant rate through the driving circuit.

Furthermore, in addition to maximizing color mixing in the LED arrangement of the present invention, the white LEDs 407 may be individually driven to improve luminance uniformity.

In addition, in addition to the first, second, and third embodiments of the liquid crystal display module according to the present invention, a white LED may be arbitrarily disposed and fixed at a portion having a weak color uniformity.

 On the other hand, while described above with reference to a preferred embodiment of the present invention, those skilled in the art various modifications of the present invention without departing from the spirit and scope of the invention described in the claims below And can be changed.

As described above, the liquid crystal display module according to the present invention has the following effects.

The liquid crystal display module according to the present invention maximizes the white color mixing of the weak edges on the screen of the backlight and the liquid crystal module by arranging white LEDs instead of R / G / B at the edges of the LED array of the LED backlight. You can.

In addition, the liquid crystal display module according to the present invention may further improve brightness uniformity by separately arranging white LEDs instead of R / G / B LEDs at the edges of the LED package array.

Claims (14)

A liquid crystal panel; And An LED package array disposed under the liquid crystal panel and including a plurality of LED packages and a plurality of white LEDs including red (R), green (G), and blue (B) LEDs, and arranged with a plurality of white LEDs at an edge; Liquid crystal display module comprising a. The liquid crystal display module of claim 1, wherein the white LEDs are arranged at upper and lower edge portions of the LED package array. The liquid crystal display module of claim 1, wherein the white LEDs are arranged at left and right edges of the LED package array. The liquid crystal display module according to claim 1, wherein the white LEDs are arranged at each corner of the LED package array. The liquid crystal display module according to claim 1, wherein the liquid crystal panel comprises an array substrate, a color filter substrate, and a liquid crystal layer formed therebetween. A liquid crystal panel; And An LED package disposed under the liquid crystal panel and including a plurality of LED packages including red (R), green (G), and blue (B) LEDs, and a plurality of white LEDs; Liquid crystal display module comprising a backlight unit having an array. The liquid crystal display module of claim 6, wherein the white LEDs are arranged at upper and lower edge portions of the LED package array. The liquid crystal display module of claim 6, wherein the white LEDs are arranged at left and right edges of the LED package array. 7. The liquid crystal display module according to claim 6, wherein the white LEDs are arranged at each corner of the LED package array. The liquid crystal display module according to claim 6, wherein the liquid crystal panel comprises an array substrate, a color filter substrate, and a liquid crystal layer formed therebetween. The liquid crystal display module of claim 6, wherein the backlight further comprises upper and lower frames, a reflector, and side supports. 12. The liquid crystal display module as claimed in claim 11, wherein the white LED is arranged at a position of the LED package array closest to the reflector or the side support. The liquid crystal display module of claim 12, wherein the LED package array is located in an effective display area of the liquid crystal panel and the backlight unit. The liquid crystal display module as claimed in claim 6, wherein the white LED is individually driven with an LED package consisting of the red, green, and blue LEDs.

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