KR101294690B1 - Liquid Crystal Display module - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display module, and more particularly, to a liquid crystal display module capable of correcting distortion and eliminating luminance unevenness on a display screen.

To this end, the present invention provides a liquid crystal display module having first and second corners and third and fourth corners in a diagonal direction, and includes a first linear member connecting the first and second corners on a rear surface of the liquid crystal display module. The torsion may be corrected by adjusting the distance between the first linear member and the rear surface of the liquid crystal display module.

Accordingly, the present invention can eliminate luminance non-uniformity such as fixed light leakage by correcting the torsion in the diagonal direction of the liquid crystal display module through a relatively simple operation, and has the advantage that it can be corrected at any time according to the intention of the user.

Description

Liquid Crystal Display Module

1 is an exploded perspective view of a typical liquid crystal display module.

Figure 2 is a photograph showing a luminance non-uniformity phenomenon due to the twist of the general liquid crystal display module.

3A to 3D are simulation analysis results for the degree of twisting of the general liquid crystal display module, respectively.

4 is a rear perspective view of the liquid crystal display module according to the first embodiment of the present invention.

5 is a rear perspective view of a liquid crystal display module according to a second embodiment of the present invention.

6 is a rear perspective view of the liquid crystal display module according to the third embodiment of the present invention.

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

100: liquid crystal display module 110: cover bottom

120: top cover 102, 104, 106, 108: first to fourth corner

142: first linear member 152: first screw hole

162: first adjusting screw 172: first supporting end

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display module, and more particularly, to a liquid crystal display module capable of correcting distortion and eliminating luminance unevenness on a display screen.

Liquid crystal display devices (LCDs), which are used for TVs and monitors because of their high contrast ratio and are advantageous for displaying moving images, are characterized by optical anisotropy and polarization of liquid crystals. The principle of image realization is shown as liquid crystal panel, which is bonded to face-to-side between two substrates side by side with liquid crystal layer as an essential component, and the arrangement direction of liquid crystal molecules is changed by an electric field in the liquid crystal panel. To realize the difference in transmittance. However, since the liquid crystal panel does not have a self-luminous element, a dimming means is required to project the difference in transmittance to the outside. To this end, a cold cathode fluorescent lamp (CCFL) or an external electrode is disposed on the back of the liquid crystal panel. A back light assembly in which a light source such as external electrode fluorescent lamps (EEFL) is incorporated is separately disposed.

In this case, a backlight for a general liquid crystal display device is classified into a side light type and a direct light type according to a relative position of a light source with respect to the liquid crystal panel, and the former light metering type is at least one side of the rear side of the liquid crystal panel. While the light of the light source arranged in the light guide panel (LGP) is refracted and supplied to the liquid crystal panel, the latter direct type provides direct light by placing a plurality of light sources facing the rear of the liquid crystal panel. Therefore, the metering type backlight has a small amount of light source and is rather disadvantageous for high brightness, and is mainly used for small models such as display screens and monitors for notebooks. As it is possible to implement, it is widely used in large models such as TVs.

On the other hand, a general liquid crystal display device is a liquid crystal panel and the backlight is a modular form integrally through a predetermined mechanical element, so that, below, the liquid crystal display module, Figure 1 is an exploded perspective view of a general direct type liquid crystal display module The edges of the liquid crystal panel 10 and the backlight 20 that are stacked up and down are surrounded by a rectangular main frame support main (support main) 40, and cover cover 50 for maintaining the overall shape and minimizing light loss. The top cover (60) of a rectangular frame shape covering the rear surface of the backlight 20 and bordering the front edge of the liquid crystal panel 10 is assembled with the cover bottom 50 through the support main 40. Are integrated.

Among them, the liquid crystal panel 10 has a shape in which the first and second substrates are bonded side by side with the liquid crystal layer interposed therebetween, and the liquid crystal panel driving circuit is mounted via the flexible circuit board 12 along at least one edge thereof. In the modularization process, the support main body 40 is flipped to the side or the cover bottom 50 to be properly brought into close contact.

The backlight 20 includes a reflective sheet 22 covering an inner surface of the cover bottom 50, a plurality of fluorescent lamps 24 arranged side by side on the front surface thereof, and these fluorescent lamps 24 and the liquid crystal panel 10. A plurality of optical sheets 28 or the like interposed therebetween.

Therefore, the light emitted from the fluorescent lamp 24 is processed to a high quality of uniform brightness while passing through the optical sheet 28 together with the light reflected by the reflective sheet 22 is evenly supplied to the entire area of the liquid crystal panel 10.

On the other hand, the general liquid crystal panel 10 is designed and manufactured on the assumption of perfect flat as long as the flatness of the substrate permits. The cell gap defined by is changed to cause a change in luminance such as unevenness. However, in the liquid crystal display module which employs mechanical elements such as the support main 40 and the cover cover 50 and the top cover 60 to integrate the liquid crystal panel 10 and the backlight 20, the coupling pressure is uneven or designed. A certain amount of twist may be applied to the liquid crystal panel 10 due to an error and the like, and thus, luminance unevenness is frequently found.

That is, FIG. 2 is a photograph showing a luminance non-uniformity commonly found in a general liquid crystal display module, and a so-called fixed light leakage phenomenon in which the luminance differs diagonally in an off-state liquid crystal panel as shown by a dotted line appears.

Therefore, the present applicant has conducted several experiments to find the cause of the luminance unevenness caused by the torsion in the state of the liquid crystal display module. The specific experimental method is to disassemble each part of the liquid crystal display module showing the fixed light leakage phenomenon in the diagonal direction. The degree of twist was measured using a three-dimensional contact meter.

3A to 3D are simulation results showing the degree of torsion according to the disassembling step of the liquid crystal display module, respectively. FIG. 3A corresponds to the liquid crystal display module before disassembly, and FIG. In addition, FIG. 3C illustrates the degree of twist of the support main four edges with the top cover and the liquid crystal panel removed, and FIG. 3D illustrates the degree of twist of the liquid crystal panel only.

When referring to these, the degree of twisting of the liquid crystal panel alone is not very large as in 3d, but the degree of twisting of a similar aspect in a diagonal direction from FIG. 3c to FIG. It can be seen that it is gradually deepened, and thus, the main cause of the twisting of the liquid crystal display module can be concluded that it is a mechanical element such as cover main and top cover including support main.

However, at present, there is no way to effectively cope with the torsion of the liquid crystal display module, so there is no practical countermeasure except for perfection in the manufacturing and combining of the cover bottom and the top cover including the support main. Moreover, the torsional phenomenon of the liquid crystal display module may occur in all cases such as manufacturing, transportation, and storage, and in actual use, but at that time, it is impossible to properly control the torsional phenomenon at that time, and appropriate countermeasures are urgently required.

In order to achieve the above object, the present invention provides a liquid crystal display module having first and second corners and third and fourth corners in a diagonal direction, and connecting the first and second corners on the rear surface of the liquid crystal display module. And a first linear member overlapping the first linear member and the liquid crystal display module, and having a first interval adjusting means, the first linear member and the liquid crystal being controlled by the first interval adjusting means. Provided is a liquid crystal display module that can correct the distortion by changing the distance between the back of the display module.

At this time, the first gap adjusting means is a first adjustment screw penetrating the first linear member and the end is in contact with the rear surface of the liquid crystal display module, the first linear member and the liquid crystal in accordance with the rotation direction of the first adjustment screw The distance between the back surface of the display module is changed, in this case, in particular, it is characterized in that it further comprises a first fixed end of a rubber material attached to the back of the liquid crystal display module is in contact with the end of the first adjustment screw.

The first linear member may include a first sub-linear member having one end connected to the first edge in a state in which a first fitting hole of a predetermined interval is protruded on a rear surface thereof, and a first interval of a predetermined interval into which the first fitting hole is inserted. It is divided into a second sub-linear member having one end connected to the second corner in a state where the fitting hole is perforated, and the first fitting hole and the first fitting hole serve as the first spacing adjusting means, and the first fitting hole and the first fitting hole. The torsion can be corrected according to the fitting position of the fitting hole.

In addition, the present invention further comprises a second linear member connecting the third and fourth corners on the back of the liquid crystal display module, in which case the first and second linear members and the liquid crystal display module back It is possible to correct the torsion by adjusting the interval between each, and overlaps with the second linear member and the liquid crystal display module is provided with one second spacing adjusting means, the second spacing adjusting means A second adjustment screw through which the terminal is in contact with the rear surface of the liquid crystal display module through a second linear member, wherein an interval between the second linear member and the rear surface of the liquid crystal display module is adjusted according to the rotation direction of the second adjustment screw; It is characterized by. In this case, the liquid crystal display module may further include a second fixing end of a rubber material attached to the rear end of the second adjusting screw.

The second linear member and the liquid crystal display module are overlapped with each other, and a second gap adjusting means is provided, and the gap between the second linear member and the rear surface of the liquid crystal display module is changed by adjusting the second gap adjusting means. The second linear member may include: a third sub-linear member having one end connected to the third corner with a second fitting hole having a predetermined interval protruding from the rear surface thereof, and a predetermined interval being inserted with the second fitting hole; The second fitting hole is divided into a fourth sub-linear member having one end connected to the fourth corner in a state where two fitting holes are perforated, and the second fitting hole and the second fitting hole serve as the second spacing adjusting means, and the second fitting hole and the first 2 torsion can be corrected according to the fitting position of the fitting hole.

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

Prior to the full description, the liquid crystal display module according to the present invention is characterized in that a correction means for correcting the torsion is provided on the back, it can be divided into several embodiments according to the detailed form of such a correction means Let's look at each case in detail. At this time, the same reference numerals are assigned to the same parts that play the same role in each embodiment, and thus redundant descriptions are omitted, and common elements will be described as representatives through the first embodiment.

First Embodiment

First, FIG. 4 is a rear view of the liquid crystal display module 100 according to the first embodiment of the present invention. The liquid crystal display module 100 is turned upside down so that the cover bottom 110 faces upward.

At this time, the configuration of the liquid crystal display module 100 according to the present invention except for the first calibration means 132 provided on the rear surface may be based on general technical idea, and thus is not illustrated in a separate drawing, but is stacked up and down. The cover bottom 110 covering the back surface of the backlight and the top cover 120 bordering the front edge of the liquid crystal panel are combined with the support main through the frame main frame surrounded by the rectangular frame-shaped support main. To be integrally modular. The dual liquid crystal panel is composed of first and second substrates bonded to each other with the liquid crystal layer interposed therebetween, and the backlight includes a reflective sheet interposed along an inner surface of the cover bottom, a plurality of fluorescent lamps arranged side by side, and the fluorescent lamp. It may be composed of a plurality of optical sheets interposed between the lamp and the liquid crystal panel.

In addition, the first calibration means 132 according to the first embodiment of the present invention includes a first linear member 142 connecting both corners of the diagonal direction from the back of the liquid crystal display module 100, the first linear member ( The torsion in the diagonal direction of the liquid crystal display module 100 may be corrected by adjusting the distance between the rear surface of the liquid crystal display module 100 and the cover bottom 110.

More specifically, the liquid crystal display module 100 according to the present invention has a rectangular shape having first and second corners 102 and 104 and third and fourth corners 106 and 108 in a diagonal direction. Both ends of the 142 may be arbitrarily coupled to the first and second edges 102 and 104, respectively, to cross the rear surface of the liquid crystal display module 100 in a diagonal direction. In this case, the first linear member 142 may have a strip shape made of a metal material that maintains a certain degree of elasticity and strength, and thus may have a structure similar to a leaf spring. Therefore, the first linear member 142 and the liquid crystal display module 100 may be formed. When the gap between the back surface is reduced, the first and second corners 102 and 104 are extended to the opposite side of the cover bottom 110, that is, the top cover 120, and conversely, the first linear member 142 and the liquid crystal display module 100. As the distance between the back surfaces increases, the first and second edges 102 and 104 are closed in the cover bottom 110 direction.

In order to finely adjust the gap between the first linear member 142 and the rear surface of the liquid crystal display module 100, a first screw hole 152 having a screw thread is penetrated through an intermediate point of the first linear member 142. Here, the first adjusting screw 162 is inserted so that the end thereof comes into contact with the rear surface of the liquid crystal display module 100, that is, the cover bottom 110. Accordingly, when the first adjustment screw 162 is rotated in one direction, the distance between the first linear member 142 and the rear surface of the liquid crystal display module 100 increases, and when rotated in the opposite direction, the first linear member 142 and the liquid crystal display are rotated. Since the distance between the back surface of the module 100 is reduced, the distance between the first linear member 142 and the back surface of the liquid crystal display module 100 is properly adjusted through the rotational direction of the first adjustment screw 162, thereby torsion in the diagonal direction. Can be corrected.

In this case, preferably, the position of the first screw hole 152 is an accurate intermediate point of the first linear member 142, which is more effective for torsion correction, and the cover bottom contacting the end of the first adjustment screw 162 ( The back cover 110 may prevent damage due to direct friction between the cover bottom 110 and the first adjusting screw 162 via the first supporting end 172 such as rubber.

Second Example

Next, FIG. 5 is a view showing the second calibration means 134 according to the second embodiment of the present invention. Like FIG. 4, the cover bottom 110 of the liquid crystal display module 100 faces upward. It is a rear view.

In this embodiment, in addition to the first linear member 142, the first adjustment screw 162, and the first support end 172 described above with reference to FIG. 4, the third and fourth corners 106 and 108 are disposed on the rear surface of the liquid crystal display module 100. A second adjustment screw 164 and a second adjustment screw 164 through which a second end of the second linear member 144 and a second screw hole 154 penetrate the back of the liquid crystal display module 100. ) And a second support end 174 interposed between the back of the liquid crystal display module 100, that is, the cover bottom 110. In addition, the second linear member 144 and the second adjustment screw 164 are the same as the first linear member 142 and the first adjustment screw 162 by the same principle as the third and third of the liquid crystal display module 100. The twist of the four corners (106, 108) direction is corrected, and during this process, the second support end 174 prevents direct contact between the second adjusting screw 164 and the cover bottom 110 to prevent damage.

Accordingly, the first and second linear members 142 and 144 may have the first and second corners 102 and 104 and the third and fourth corners 106 and 108, respectively, according to the rotation direction and the degree of rotation of the first and second adjustment screws 162 and 164. Correction of the twist in the diagonal direction connecting the bar, compared to the first embodiment is possible to correct for the twist in a variety of directions. In addition, the correct through position of the first and second adjustment screws 162 and 164 is preferably the exact intermediate point of the first and second linear members 142 and 144, respectively. As shown in the first and second linear members 142 and 144, penetrates a certain position away from the center.

Third Embodiment

6 shows a third calibration means 136 according to the third embodiment of the present invention. As shown in the second embodiment, the first and second edges 102 and 104 of the liquid crystal display module 100 are connected to each other. Although the second linear member 144 connecting the first linear member 142 and the third and fourth corners 106 and 108 is used, the first linear member 142 is the first corner of the liquid crystal display module 100. The first sub-linear member 142a having one end connected to the 102 and the second sub-linear member 142b having one end connected to the second corner 104 are divided into second liquid crystal display modules (144). A third sub linear member 144a having one end connected to the third edge 106 of the 100 and a fourth sub linear member 144b having one end connected to the fourth corner 108 are divided.

The other ends of the first and second sub-linear members 142a and 142b overlap with each other by a predetermined length, and the other ends of the third and fourth sub-linear members 144a and 144b also overlap with each other. A plurality of first fitting ends 156 having a predetermined interval protrude from the rear surface of the first sub linear member 142a, and a first fitting end 156 is attached to the second sub linear member 142b. A plurality of first through holes 158 having a predetermined interval along the longitudinal direction are perforated to allow insertion of the first through holes 158. In addition, although not shown in the drawings, a plurality of second fitting ends having a predetermined interval protrude from the rear surface of the third sub linear member 144a along a longitudinal direction, and a second fitting is fitted to the fourth sub linear member 144b. A plurality of second through holes representing a predetermined distance along the longitudinal direction is perforated so that the stage can be inserted.

Accordingly, the length of the first linear member 142 may be substantially contracted and extended by adjusting the insertion positions of the first fitting end 156 and the first through hole 158. Similarly, the second fitting end and the second through hole may be extended. By adjusting the insertion position, the length of the second linear member 144 may be substantially contracted and extended. In the second embodiment, the first and second linear members 142 and 144 have the same function as the first and second linear members 142 and 144 far from the rear surface of the liquid crystal display module 100 in the second embodiment. In the case of length extension, the first and second linear members 142 and 144 have the same function as being closer to the rear surface of the liquid crystal display module 100, thereby correcting the twist of the liquid crystal display module 100.

In this case, only one of the first and second linear members 142 and 144 may be used. In this case, the same operation as that of the first embodiment may be expected.

As described above, the present invention provides a specific method for correcting a twist in a diagonal direction of the liquid crystal display module. In addition, the calibration means disclosed in the present invention can remove the luminance non-uniformity phenomenon such as fixed light leakage by correcting the twist in the diagonal direction of the liquid crystal display module through a relatively simple operation, there is an advantage that can be corrected from time to time according to the user's intention.

Claims (9)

A back panel positioned on the back of the liquid crystal panel and the liquid crystal panel, a square frame-shaped support main bordering the outside of the backlight and the liquid crystal panel, a cover bottom covering the back surface of the backlight, and a top cover bordering the front edge of the liquid crystal panel. Is a liquid crystal display module which is integrally modularized by being coupled through a support main, and has first and second corners and third and fourth corners in a diagonal direction. And a first linear member connecting the first and second corners on the rear surface of the liquid crystal display module, overlapping the first linear member and the liquid crystal display module, and having a first interval adjusting means. And a gap between the first linear member and the rear surface of the liquid crystal display module by adjusting the gap adjusting means to correct the twist. The method of claim 1, The first gap adjusting means is a first adjustment screw penetrating the first linear member and having a distal end contacting the rear surface of the liquid crystal display module. Liquid crystal display module in which the distance between the back of the module is changed. 3. The method of claim 2, And a first fixing end of a rubber material attached to a rear surface of the liquid crystal display module to contact the end of the first adjusting screw. The method of claim 1, The first linear member, The first sub-linear member whose one end is connected to the first corner with the first fitting hole of the predetermined interval protruding from the rear surface, and the first fitting hole of the predetermined interval into which the first fitting hole is inserted are perforated. It is divided into a second sub-linear member having one end connected to two corners, wherein the first fitting hole and the first fitting hole serve as the first gap adjusting means, and are twisted according to the coupling position of the first fitting hole and the first fitting hole. LCD display module that can calibrate. The method according to any one of claims 1 to 4, wherein And a second linear member connecting the third and fourth corners on the rear surface of the liquid crystal display module. 6. The method of claim 5, A liquid crystal display module that can correct the torsion by adjusting the distance between the first and second linear members and the rear surface of the liquid crystal display module. 6. The method of claim 5, A second gap adjusting means overlapping with the second linear member and the liquid crystal display module, the second gap adjusting means passing through the second linear member and having an end contacting the rear surface of the liquid crystal display module; 2. The liquid crystal display module of claim 2, wherein an interval between the second linear member and the rear surface of the liquid crystal display module is adjusted according to the rotation direction of the second adjustment screw. 8. The method of claim 7, And a second fixing end of a rubber material attached to a rear surface of the liquid crystal display module to contact the end of the second adjusting screw. 6. The method of claim 5, The second linear member and the liquid crystal display module overlap the second linear adjustment means is provided and the distance between the second linear member and the rear surface of the liquid crystal display module is changed by the adjustment of the second gap adjusting means. The second linear member may include: a third sub-linear member having one end connected to the third corner in a state in which a second fitting hole of a predetermined interval is protruded on a rear surface thereof, and a second interval of a predetermined interval into which the second fitting hole is inserted; It is divided into a fourth sub-linear member having one end connected to the fourth corner while the fitting hole is perforated, and the second fitting hole and the second fitting hole become the second gap adjusting means, and the second fitting hole and the second Liquid crystal display module that can correct the torsion according to the fitting position of the fitting hole.

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