KR100806121B1 - Light guided panel and liquid crystal display device using the same - Google Patents

Abstract

A light guide plate, a front illumination type liquid crystal display device using the same, and an image display method thereof are disclosed. The light reflection pattern formed on the light reflecting surface of the light guide plate to change the optical distribution and prevent the moire phenomenon to block the light leaking to the side of the light guide plate so that the effective display area is not divided into the bright area, the boundary area and the dark area. do. This has the advantage that the display can be performed with improved brightness uniformity, with the possibility of changing the optical distribution and suppressing moiré phenomena.

LCD, LGP, Moire, Reflective Pattern

Description

Light guide plate, liquid crystal display device using the same {LIGHT GUIDED PANEL AND LIQUID CRYSTAL DISPLAY DEVICE USING THE SAME}

1 is a conceptual diagram of a conventional liquid crystal display device.

FIG. 2 is an enlarged view of a portion A of FIG. 1.

3 is a plan view for comparing a light reflection pattern of a light guide plate of a conventional liquid crystal display with a direction of a pixel electrode of a liquid crystal display panel.

FIG. 4A is a plan view illustrating a light reflection pattern of a light guide plate and a pixel electrode of a liquid crystal display panel to prevent moire generated by the structure of FIG. 3.

4B is a plan view illustrating an effective display area of a conventional liquid crystal display device divided into three regions having a large luminance difference by a light guide plate.

5 is a perspective view for explaining the configuration of a light guide plate according to an embodiment of the present invention.

6 is a conceptual diagram illustrating a cross section of a light guide plate, a relationship between a lamp and a light guide plate, and an effective display area of a lamp according to an embodiment of the present invention.

7 is a plan view illustrating another embodiment of a light guide plate according to an embodiment of the present invention.                 

8 is a plan view illustrating another embodiment of a light guide plate according to an embodiment of the present invention.

9 is a diagram illustrating a measuring point for measuring a luminance distribution for each position of a light guide plate according to an embodiment of the present invention.

10 is a graph showing the results of the experiment of FIG. 9.

11 is a conceptual diagram of a liquid crystal display device including a light guide plate according to an embodiment of the present invention.

FIG. 12 is a perspective view of a liquid crystal display according to an exemplary embodiment of the present invention in three dimensions.

13 is an exploded perspective view of a liquid crystal display panel of a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 14 is an enlarged perspective view of the thin film transistor of FIG. 13.

15 is a plan view illustrating a relationship between a pixel electrode and a light reflection pattern of a light guide plate of a liquid crystal display panel according to an exemplary embodiment of the present invention and parting lines.

The present invention relates to a light guide plate, a liquid crystal display device using the same, and an image display method thereof. In particular, the display can be performed using a liquid crystal even in a dark place, and a moiré phenomenon can be suppressed as well as a moiré phenomenon generated in this process. The present invention relates to a light guide plate that overcomes even luminance unevenness caused by a structure for suppressing the light emission, to enable high quality display, a liquid crystal display device using the same, and an image display method in an image display method thereof.

In general, a liquid crystal display device is a display that allows a user to recognize information processed by an information processing device by precisely controlling the light transmittance of the liquid crystal using the electro-optical characteristics of the liquid crystal. It is defined as one of the display devices.

Such liquid crystal display devices are broadly classified into reflection type LCDs and transmission type LCDs. In this case, the reflective liquid crystal display device is mainly used for small and medium sized display devices, and the transmissive liquid crystal display device is used for medium and large display devices.

In this case, the reflective liquid crystal display device receives the light required for the display from the outside of the reflective liquid crystal display device to display information, and the structure is very simple, and only the power for controlling the liquid crystal is required, so the power consumption is very low.

Such a reflective liquid crystal display device has a fatal problem in that the amount of light is insufficient or the information cannot be accurately displayed in a dark night because the light required for the display is completely dependent on the external environment.

This problem can be overcome by the transmissive liquid crystal display. The transmissive liquid crystal display consumes electrical energy supplied into the transmissive liquid crystal display to generate light, thereby generating light necessary for the display by itself, so that information can be freely displayed anywhere regardless of the external environment.

However, such a transmissive liquid crystal display device has another disadvantage in that the amount of power consumption is much higher than that of the reflective liquid crystal display device because additional power is required to produce light in addition to the power required to control the liquid crystal.

Recently, a so-called "front illumination type liquid crystal display device" has been developed that overcomes the problems of the reflective liquid crystal display device and the problems of the transmissive liquid crystal display device and utilizes the advantages of the reflective liquid crystal display device and the advantages of the transmissive liquid crystal display device. have.

This front lighting type liquid crystal display performs display using external light in an environment rich in external light, and displays using artificial light generated by consuming electric energy in an environment where external light is insufficient. This has the advantage that the display can be performed anywhere.

FIG. 1 shows a conventional front illumination type liquid crystal display device (hereinafter, referred to as a liquid crystal display device).

Referring to the accompanying drawings, the conventional liquid crystal display device 10 is composed of a light source 2, a light guide plate 4, and a liquid crystal display panel assembly 6 as a whole.

Although not shown, the liquid crystal display panel assembly 6 includes a liquid crystal display panel composed of a TFT substrate, a liquid crystal, and a color filter substrate, and a driving module.

Specifically, the color filter substrate is formed with a common electrode and an RGB color pixel to which power of the same size is applied over the entire area. On the other hand, a TFT substrate has a plurality of pixel electrodes formed to have a very small area, and signal lines and thin film transistors for applying power of different sizes to each pixel electrode. The liquid crystal is injected between the color filter substrate and the TFT substrate.

On the other hand, the driving module processes the data applied by the external information processing apparatus and applies the signal to the signal line formed on the TFT substrate so that the display can be performed.

Therefore, as described above, the liquid crystal display panel assembly 6 has a configuration suitable for individually controlling the power output through each thin film transistor. In addition, the liquid crystal display panel assembly 6 has a configuration suitable for individually controlling the intensity of the power applied to the pixel electrode connected to each thin film transistor. As a result, the liquid crystal display panel assembly 6 has a configuration suitable for very precisely controlling the arrangement of liquid crystals in small area units according to the electric field difference adjustment between the pixel electrode and the common electrode.

However, no matter how precisely the arrangement of the liquid crystals is controlled in units of small areas, no information is displayed without light, and thus a light source for generating light is required to perform the display.

At this time, the light source supplied to the liquid crystal display panel assembly 6 is ideally a light source having almost no luminance difference within a predetermined area similar to sunlight, but it is inevitably difficult to manufacture a light source having a brightness distribution similar to sunlight. It is easy to manufacture and high linear or point light source is used.

However, the linear light source or the point light source has the advantages of high manufacturing and local brightness, whereas the brightness distribution according to the distance is very uneven, so that when the light generated from the linear light source or the point light source is supplied to the liquid crystal display panel assembly as it is, there is a serious uneven brightness. Therefore, no matter how precisely the liquid crystal is controlled, the desired image cannot be obtained.

For this reason, the light guide plate 4 is used in the liquid crystal display device 10 as shown in FIG. 1 in order to obtain a surface light source effect similar to sunlight from a light source generated from a line light source or a point light source.

The light guide plate 4 has a thin rectangular parallelepiped shape having a shape similar to that of the effective display area of the liquid crystal display device 10 and an equivalent shape.

The light guide plate 4 is supplied with light having an optical distribution concentrated in a significantly smaller area than the effective display area, and changed to have a uniform optical distribution that is equivalent to the effective display area, and then the liquid crystal display panel assembly 6 described above. ) To be supplied.

Meanwhile, in order to maximize light utilization efficiency by minimizing light loss in the light guide plate 4, a light having a groove shape having a “V” shape in cross section is formed on the top surface of the light guide plate 4 as shown in FIG. 2. A plurality of reflection patterns 3 are formed in succession.

However, in order to maximize the light utilization efficiency, the light reflection pattern 3 formed on the upper surface of the light guide plate 4 is referred to as "moire" according to the arrangement relationship of the pixel electrodes arranged in the matrix form on the liquid crystal display panel assembly 6 described above. It may or may not cause optical interference.

Specifically, as shown in FIG. 3, when the formation direction of the light reflection pattern 3 and the arrangement direction of the pixel electrode 6a of the liquid crystal display panel assembly 6 coincide, the two patterns may overlap. The moiré phenomenon is generated.

According to the recently developed technology, as shown in FIG. 4A, it is known that the moiré phenomenon can be minimized by shifting the direction in which the light reflection pattern 3 extends from the arrangement direction of the pixel electrode 6a by 22.5 °.

However, when the arrangement directions of the light reflection pattern 3 and the pixel electrode 6a are crossed by 22.5 degrees as shown in FIG. 4A, the moiré phenomenon is minimized, but as shown in FIG. 4B, the effective display area is a bright area. , III), dark areas I, and their boundary areas II, which cause luminance unevenness to occur.

Specifically, referring to FIGS. 1 to 4B, the reason why the effective display area is divided into three areas is that light generated from the lamp 2 having the linear light source shape is reflected by the light reflection pattern 3. This is because the propagation direction of the light is changed according to the angle.

That is, the light reaching the region III of FIG. 4B among the light generated by the lamp 2 is reflected by the light reflection pattern 3 and then reflected in the direction toward the pixel electrode 6a of the liquid crystal display panel assembly 6 to be III. In the region, display is performed with high luminance.

On the other hand, the light reaching the region I of FIG. 4B of the light generated by the lamp 2 is not reflected toward the liquid crystal display panel assembly 6, but is reflected to the side of the light guide plate 4 indicated by reference numeral 4a and leaked to the outside. do. Therefore, in this region I, the amount of light reflected by the pixel electrode 6a of the liquid crystal display panel assembly 6 is insufficient, so that the display is significantly darker than the region III.

On the other hand, region II is a boundary region that is brighter than region I and darker than region III, and has a band shape having a predetermined thickness. At this time, there is a difference in degree of light and dark within the region II, and becomes brighter from the region I to the region III.

 As the three areas are formed on the effective display area, the biggest problem is that the difference in brightness in each area is so significant that the moiré phenomenon is suppressed but the brightness unevenness is intensified.

In conclusion, when the alignment direction of the light reflection pattern 3 formed on the light guide plate 4 and the pixel electrode 6a coincide with each other, the effective display area is not divided into a bright area and a dark area, but a moiré phenomenon occurs. When the light reflection pattern 3 formed on the light emitting pattern 3 and the pixel electrode 6a are tilted out of alignment with each other, the moiré phenomenon is minimized, but the brightness unevenness of the effective display area is intensified.

Accordingly, the present invention has been made in view of such a conventional problem, and a first object of the present invention is to provide a light guide plate which prevents moiré phenomenon and makes the luminance uniformly in the entire effective display area when performing a display in a liquid crystal display device. In providing.

It is also a second object of the present invention to provide a liquid crystal display device which prevents moiré phenomenon while at the same time minimizing display luminance difference over the entire effective display area.                         

Further, a third object of the present invention is to provide an image display method in a liquid crystal display device for preventing the moiré phenomenon while at the same time minimizing the display luminance difference over the entire effective display area.

The light guide plate for implementing the first object of the present invention is parallel to the light guide body including a plurality of side surfaces, an upper surface and a lower surface so that a three-dimensional shape is formed, and a boundary line formed where the first side and the upper surface where light enters meet each other. It is formed on the surface of the upper surface so as not to have an angle so that a part of the light incident on the light incident surface is directed to the lower surface and the second side of the light is not directed toward the lower surface by the light reflection pattern of the side And light reproducing means for reproducing so that the light is directed toward the lower surface.

In addition, a liquid crystal display device for realizing a second object of the present invention includes a) a light guide body including a plurality of side surfaces, an upper surface and a lower surface so that a three-dimensional shape is formed, and b) a first side surface and an upper surface of which light is incident. A light reflection pattern which is formed on the surface of the upper surface so as to have an angle not parallel to the first boundary line formed to meet, so that a part of the light incident on the light incident surface faces the lower surface; A light guide plate including a light reproducing means which is formed on a second side of which light is emitted and which regenerates the light toward a lower surface thereof, and is installed to face the first side, and one end of the effective light emitting area is at least the second side and the first side. The lamp assembly includes a lamp coincident with the second boundary line where the side faces, and is formed in the form of a matrix and a direction in which the light reflection pattern is formed. It includes a liquid crystal display panel so that the direction in which the small electrodes are formed is not parallel to each other.

In addition, an image display method in a liquid crystal display device for realizing a third object of the present invention comprises the steps of: i) generating a first light having a linear light source distribution by an effective light emitting region having a first length, ii) a first Changing the light into a second light having a surface light source distribution having a second length equal to the maximum first length and supplying it toward the liquid crystal display panel, and changing the third light lost during the first light into the second light. Reproducing in the direction of light and feeding it toward the liquid crystal display panel, i) allowing the second and third light supplied to the liquid crystal display panel to pass through the liquid crystal and the color pixel to form a fourth light whose light transmittance and wavelength are modulated. Steps.

According to the present invention, even when the liquid crystal display device lacks light or no light, the information display can be performed at a uniform brightness, and the information display can be performed at a uniform brightness, and at the same time, a moire phenomenon can be prevented to perform a high quality display. To help.

Hereinafter, an image display method in a light guide plate, a liquid crystal display, and a liquid crystal display according to an embodiment of the present invention will be described in detail.

In the present invention, the display is performed in a dark place, the light reflection pattern of the light guide plate necessary for performing the display in the dark place and the moire phenomenon caused by the relationship between the pixel electrode and the light reflection pattern for suppressing the moiré phenomenon In order to overcome the luminance unevenness, first, the shape of the light guide plate is changed, and secondly, the relationship between the lamp and the light guide plate is changed to implement the object of the present invention.

Hereinafter, a light guide plate according to the present invention will be described first, and then a liquid crystal display device including a light guide plate, a lamp, and a liquid crystal display panel assembly will be described, and finally, an image display method in the liquid crystal display device will be described.

5 is a diagram illustrating a light guide plate and a light guide plate and a lamp according to an embodiment of the present invention.

Referring to FIG. 5, the light guide plate 200 includes a light guide body 210, a light reflection pattern 220, and a light regeneration unit 230 in a preferred embodiment.

Specifically, the light guide body 210 has a rectangular parallelepiped plate shape in one embodiment, the plane is rectangular. At this time, the light guide body 210 in one embodiment of the present invention has a rectangular parallelepiped plate shape, because the shape of the effective display area of the liquid crystal display panel assembly to be described later in detail has a rectangular shape. That is, the shape of the light guide body 210 may be variously changed to correspond to the shape of the liquid crystal display panel assembly.

More specifically, the light guide body 210 according to the embodiment of the present invention is composed of four side surfaces 212, 214, 216, 218, an upper surface 217 (see FIG. 6), and a lower surface 215 (FIG. 6).

As such, the light guide body 210 including the four side surfaces 212, 214, 216, 218, the upper surface 217, and the lower surface 215 is configured to change the light having the optical distribution in the form of a line light source to the light having the optical distribution in the form of a surface light source. Light is incident through one or more of the two sides 212, 214, 216, 218.

Hereinafter, one or more of four side surfaces 212, 214, 216, and 218 to which light having an optical distribution in the form of a linear light source is incident will be specifically defined as a first side. In the present invention, the side shown by reference numeral 212 is the first side. Hereinafter, reference numeral 212 will be given to the first side.

On the other hand, some of the first side 212 defined above is a portion that meets the upper surface 217 of the light guide body 210 as defined above. In the present invention, the corner portion where the first side surface 212 and the upper surface 217 of the light guide body 210 meet is defined as a first boundary line 213.

The first boundary line 213 serves as a reference line for determining the formation direction of the light reflection pattern formed on the upper surface 217 of the light guide body 210.

As described above, in the state where the first boundary line 213 is defined, the light reflection pattern 220 is formed on the upper surface 217 of the light guide body 210. In this case, the light reflection pattern 220 is manufactured by forming a groove having a profile of “V” shape on the upper surface 217 of the light guide body 210 in a continuous manner.

At this time, in one embodiment, the directions formed by the light reflection pattern 220 and the first boundary line 213 are not parallel to each other. In detail, the light reflection pattern 220 is formed at an angle greater than 0 ° and less than 22.5 ° based on the first boundary line 213. In the present invention, in one preferred embodiment, the light reflection pattern 220 and the first boundary line 213 are formed to be tilted at 22.5 degrees.                     

As such, the light reflection pattern 220 based on the first boundary line 213 is larger than 0 ° and smaller than 22.5 ° so as not to be parallel to the pixel electrode of the liquid crystal display panel assembly which will be described later in detail. This is to minimize this.

In this case, the pixel electrode of the liquid crystal display panel assembly is parallel to the first boundary line 213.

Meanwhile, the light reflection pattern 220 tilted with respect to the first boundary line 213 is formed on the upper surface 217 of the light guide body 210 so that the moiré phenomenon is minimized. When light having different incidence angles is supplied to the light reflection pattern 220 through one side 212, some light is reflected by the light reflection pattern 220 to be reflected toward the liquid crystal display panel to be described later. It is not reflected toward the display panel and is directed toward the side of the light guide body 210.

Accordingly, the light guide body 210 illustrated in FIG. 5 is provided with a bright line (IV), a dark area (V), and a boundary line shown by reference numeral 211.

This is because the reflection angle of the light is different depending on the angle at which the light is reflected on the light reflection pattern 220. Specifically, some of the light reaching the bright region (IV) of the light is reflected in the vertical direction based on the upper surface of the light guide body 210 on which the light reflection pattern 220 is formed, but the remaining light reaching the dark region (V) is The light is reflected in the left and right directions by the light reflection pattern 220.

In this case, the side surface of the light guide body 210 that is reflected by the light reflection pattern 220 in the left and right directions will be defined as a second side surface. In FIG. 5, a side corresponding to reference numeral 214 is a second side.                     

In conclusion, as a result of adjusting the angle of the light reflection pattern 220 not to be parallel to the arrangement direction of the pixel electrode in order to minimize the display quality deterioration caused by the moiré phenomenon, the moiré phenomenon is minimized but luminance unevenness occurs.

In order to minimize such luminance unevenness, the present invention minimizes light leaking to the second side surface 214.

In this case, in order to minimize light leakage from the second side surface 214, the optical regeneration unit 230 is formed in the second side surface 214.

At this time, in the present invention, two embodiments of the optical regeneration unit 230 are presented, which will be described in detail as follows.

In the first embodiment, the optical regenerator 230 is a reflective mirror attached to the second side surface 214 to reflect light as shown in FIG. 6. Specifically, the optical regenerator 230 reflects the light to be lost from the second side 214 back to the liquid crystal display panel assembly by using a reflective mirror having a very thin sheet shape on the second side 214. The luminance of the dark region V can be further improved.

In this case, as shown in FIG. 7, the optical regeneration unit 230 may be partially formed at the second side 214 and partially included in the dark area of the side 216 opposite to the first side 212. Can be.

In addition, the remaining side surface 218 may be selectively formed.

In the second embodiment, as illustrated in FIG. 8, the optical regeneration unit 232 is formed on the second side surface 214 and has a smooth surface to reflect light. The surface-treated second side surface 214 may cause the light, which has been leaked, to reach the liquid crystal display panel assembly to be reflected back toward the liquid crystal display panel assembly, thereby improving the brightness of the dark region V. FIG.

Alternatively, the optical regeneration unit 232 may be installed on some or all of the side surfaces 212, 216, and 218 including the first side surface 212 and the second side surface 214, so that the display can be made with improved luminance.

The light guide plate 200 according to an embodiment of the present invention as described above allows a liquid crystal display to display in a dark place first, and secondly, to provide uniform luminance over a relatively wide effective display area. Third, it suppresses moiré phenomena generated in the process of supplying light to have uniform luminance, and fourthly, overcomes the luminance unevenness generated in the process of suppressing moiré phenomena to enable high quality display.

9 and 10 are graphs showing how the luminance is improved by forming the light regenerators 230 and 232 on the second side surface 214 of the light guide body 210.

The luminance measurement is performed when the optical regenerators 230 and 232 are formed on the second side surface 214 of the light guide body 210 and when the optical regenerators 230 and 232 are not formed on the second side surface 214 of the light guide body 210. When not divided into two experiments. The luminance is measured at all nine places, and the nine points at which the luminance is measured are all measured while being adjusted to maintain the same distance. At this time, the angle formed by the light reflection pattern 220 formed on the light guide body 210 and the first boundary line 213 and the first side surface 212 on which light is incident are the same conditions.

As a result of the luminance measurement, referring to FIG. 10, the luminance in the case of forming the optical reproducing unit was generally higher than in the case of not forming the optical regenerating unit.

On the other hand, even when the optical regeneration unit is formed, the luminance at the positions of the measuring point 1, the measuring point 4, and the measuring point 7 appears somewhat lower than that of the remaining measuring points.

Meanwhile, the light guide plate 200 adopting the optical reproducing unit to improve the brightness as described above to obtain improved display brightness compared with the related art, together with the lamp assembly 350 and the liquid crystal display panel assembly 400 as shown in FIG. 11. Combined to form a Liquid Crystal Display (500).

More specifically, as shown in FIG. 11, the lamp assembly 350 includes a lamp 300 and a lamp reflector 310 that emits light generated in the lamp 300 in one direction.

Lamp 300 may be a variety of types, for example, a point light source LED, a line light source cold cathode ray tube type lamp (CCFL lamp) and the like can be used. In the present invention, white light similar to sunlight is generated, and the amount of heat generated is small when light is generated to minimize the change in physical properties of the liquid crystal, and a cold cathode ray tube lamp having a long lifetime is used. Hereinafter, reference numeral 300 will be given to the cold cathode ray tube lamp.

The cold cathode ray tube lamp 300 includes two first electrodes 310, a second electrode 320, and a lamp tube 330 as shown in FIG. 6.

In this case, the first electrode 310 and the second electrode 320 are coupled to both ends of the lamp tube 330 coated with the fluorescent material on the inner wall. At this time, mercury is sealed in the lamp tube 330 sealed by the first electrode 310 and the second electrode 320.

The AC power boosted by an inverter is applied to the first electrode 310 and the second electrode 320 of the cold cathode ray tube lamp 300 such that the first electrode 310 and the second electrode 320 are applied. Electrons are emitted from any one of the spaces) and spatially move to the remaining electrodes. In this process, the electrons moving at high speed collide with the mercury electrons to generate ultraviolet rays, and the ultraviolet rays stimulate the fluorescent material formed inside the lamp tube 330 to generate visible light.

When the entire length of the cold cathode ray tube lamp 300 is defined as the first length, uniform luminance is not generated over the entire surface of the cold cathode ray tube lamp 300. For this reason, a predetermined criterion is required to determine the characteristics of all the cold cathode ray tube lamps 300, and an "effective light emitting area" is used as the criterion.

The effective light emitting region L is defined as a section that generates at least 80% of the highest luminance among the lights generated by the cold cathode ray tube lamp 300.

Referring to the graph of FIG. 6, the luminance is the lowest in the portions adjacent to both the first electrode 310 and the second electrode 320 of the cold cathode ray tube lamp 300, and the cold cathode ray tube lamp 300. Increases toward the center of the loop to produce the highest luminance.

For this reason, the effective light emitting region L is formed mostly at a predetermined distance from the first electrode 310 and the second electrode 320 of the cold cathode ray tube lamp 300.

That is, the cold cathode ray tube type lamp 300 is divided into an effective light emitting area L and an invalid light emitting area T, and only the light generated in the effective light emitting area L is effectively used.

This means that the invalid light emitting area T may adversely affect the display depending on the positional relationship between the cold cathode ray tube lamp 300 and the light guide plate 200.

In fact, both ends of the conventional cold cathode ray tube lamp 300 are installed so as to coincide with both ends of the first side surface 4a of the light guide plate 4 simply as shown in FIG. 4B without consideration of the effective light emitting area.

As described above, when both ends of the cold cathode ray tube type lamp and the first side surface 4a of the LGP are aligned without considering the effective light emitting area, the boundary region II as shown in FIG. 4B is generated.

At this time, the width of the boundary region II is increased in proportion to the distance difference between the cold cathode ray tube type lamp 2 and the end of the effective light emitting region, and sometimes reaches a degree visually recognized by the user, causing serious display defects.

The removal of the boundary region II and the minimization of the width of the boundary region II are determined according to the position of the effective light emitting region of the cold cathode ray tube type lamp 2.

At this time, the width of the boundary region can be minimized by making the length of the effective light emitting region of the cold cathode ray tube lamp the same as the entire length of the cold cathode ray tube lamp, but it is almost impossible to manufacture such cold cathode ray tube lamp. .

In order to overcome this, in the present invention, the boundary region is minimized by precisely adjusting the position of the cold cathode ray tube lamp.                     

Specifically, referring to FIG. 6, the first side 212 is adjacent to both the side 218 included in the bright area IV and the second side 214 included in the dark area V. The boundary between the second side 214 and the first side 212 will be defined as a second boundary line 214a. A second boundary line 214a is shown in FIGS. 5, 6 and 12 attached.

The second boundary line 214a of the light guide body 210 is formed such that one end of the effective light emitting region L of the cold cathode ray tube type lamp 300 is at least aligned or protrudes about 10 mm from the maximum boundary line 214a. . This minimizes or eliminates border areas that significantly degrade display characteristics.

Meanwhile, the light generated in the cold cathode ray tube type lamp assembly 300 is uniformly changed in the light guide plate 200 and then supplied to the liquid crystal display panel assembly 400 to perform display.

Therefore, in order to display the information accurately, the development of the liquid crystal display panel assembly 400 in addition to the light guide plate 200 and the lamp assembly 350 is required.

11 to 13, the liquid crystal display panel assembly 400 is composed of a liquid crystal display panel 425 and a driving device 460.

Specifically, the liquid crystal display panel 425 is composed of a color filter substrate 420, a liquid crystal 415, and a TFT substrate 410 again.

More specifically, the TFT substrate 410 is composed of the thin film transistor 408 formed on the glass substrate 409, the pixel electrode 407, and the signal lines 405 and 406.

In this case, a plurality of thin film transistors 408 are formed in a matrix on a glass substrate 109, and each of the thin film transistors 408 has a gate electrode 408 a, a drain electrode 408 c, and a thin film transistor 408. The source electrode 408b is formed.

On the other hand, the gate line 406 is commonly connected to the gate electrode 408a of the thin film transistors belonging to each column among the thin film transistors 408 formed in a matrix form.

In addition, the data line 405, which is the remaining signal line, is commonly connected to the source electrode 409b of the thin film transistors belonging to each row among the thin film transistors 408 formed in a matrix form.

In addition, a contact hole is formed on the top surface of all the thin film transistors 408 so that the drain electrode 408c is exposed, and a pixel electrode 407 is formed on the top surface of the insulating film so as to be connected to the contact hole. . In this case, the pixel electrode 407 is made of metal having high reflectance.

In this case, the pixel electrode 407 formed to have a matrix shape is set such that a column direction is parallel to the first boundary line 213 of the light guide body 210 as shown in FIG. 13.

Therefore, the light reflection patterns 220 formed on the upper surface of the pixel electrode 407 and the light guide body 210 are formed to be offset from each other by more than 2 ° at least greater than 0 °.

On the other hand, the color filter substrate 420 is composed of an RGB color pixel 418 and a common electrode (not shown) formed at a position facing the pixel electrode 407 on the glass substrate 419.

The RGB filter 418 of the color filter substrate 420 having the above configuration and the pixel electrode 407 of the TFT substrate 410 overlap with each other so that the color filter substrate 420 and the TFT substrate 410 overlap each other. The liquid crystal 415 is injected in between.

As shown in FIG. 11 or 12, the liquid crystal display panel 425 having the above configuration is provided with a driving device 460 for turning on the thin film transistor at a predetermined time and applying a specified power to the pixel electrode. The driving device 460 includes a printed circuit board 450, a tape carrier package 440, and the like.

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

First, referring to FIG. 11, light having a line light source optical distribution radially formed in a cold cathode ray tube type lamp 300 having a first length is concentrated in one direction by a lamp reflector 310 and then a lamp reflector 310. It is emitted outside of). Hereinafter, the light emitted from the lamp reflector 310 will be defined as the first light 311.

Thereafter, a process of changing the optical distribution of the first light 311 having the emitted line light source optical distribution to have the surface light source optical distribution is performed again. At this time, the traveling angle of the first light 311 emitted from the lamp reflector 310 is changed so that the moiré phenomenon in which the optical distribution is changed is supplied to the liquid crystal display panel assembly 400.

At this time, the traveling direction of the first light 311 was in a direction parallel to the liquid crystal display panel assembly 400 when it was emitted from the lamp reflector 310, but toward the liquid crystal display panel assembly 400 when the optical distribution was changed. Direction.

In addition, the first light 311 is directed toward the liquid crystal display panel assembly 400 and has a direction not parallel to the pixel electrode 407 formed in the liquid crystal display panel assembly 400. Hereinafter, the light reflected from the first light 311 to the light reflection pattern 220 toward the liquid crystal display panel assembly 400 will be referred to as a second light 313.

Meanwhile, during this process, a part of the first light 311 may have a path different from the path of the second light 313, that is, a path that does not face the liquid crystal display panel assembly 400. In other words, the leakage to the outside acts as a factor for lowering the brightness, but the light lost in this way will be defined as the third light 315.

In the present invention, in order to minimize the third light 315 acting as a factor of lowering the luminance, the third light is formed by using the optical reproducing unit 230 installed or formed in a part of the traveling path of the third light 315. The traveling path of 315 is changed to have a traveling path of the second light 313.

Thereafter, the second light 313 and the third light 315 reach the pixel electrode 407 of the liquid crystal display panel assembly 400, are reflected, and then pass through the arranged liquid crystal 415 to adjust the light transmittance. Hereinafter, the wavelength of the second light 313 and the third light 315 in which light transmittance is adjusted is adjusted while passing through the color pixels. Hereinafter, light whose light transmittance and wavelength are adjusted will be defined as a fourth light 317. The fourth light 317 is incident on the eyes of the user so that the user can recognize the information included in the fourth light.

Meanwhile, in the process of manufacturing the light guide plate 200 by injection method, as shown in FIG. 15, a parting line 290 is inevitably formed, and the parting line 290 has a second side surface 214. ), It is possible to further increase the luminance non-uniformity of the dark region, which may be formed on the remaining side surfaces 216 and 218 except for the second side surface 214 and the first side surface 212.

As described in detail above, the liquid crystal display device not only ensures that the information display is performed at a uniform brightness even where there is a lack of light or no light, but also makes the information display at a uniform brightness and at the same time prevents the moiré phenomenon. It has the effect of enabling display.

As mentioned above, although this invention was demonstrated by the said Example, this invention is not restrict | limited by this, It is clear that a deformation | transformation and improvement are possible for a person skilled in the art within the range of ordinary knowledge.

Claims (17)

A light guide body including a plurality of side surfaces, an upper surface, and a lower surface such that a three-dimensional shape is formed; Light which is formed on the surface of the upper surface to have an angle that is not parallel to the boundary line formed where the first side and the upper surface where light is incident and the upper surface of the side faces so that a portion of the light incident to the first side is directed toward the lower surface Reflective patterns; And And a light reproducing means disposed on a second side of the side of the side surface, the light of which is not directed toward the bottom surface, by the light reflection pattern to reproduce the light toward the bottom surface. The light guide plate of claim 1, wherein the second side surface is orthogonal to the first side surface. The light guide plate according to claim 1, wherein the light reproducing means is a reflective mirror. 4. The light guide plate according to claim 3, wherein the reflection mirror is a light reflection sheet attached to the second side surface. The light guide plate according to claim 3, wherein the reflective mirror is smoothly surface treated. The light guide plate according to claim 5, wherein the reflective mirror is further formed in an area adjacent to the second side of the third side facing the first side. The light guide plate of claim 1, wherein the light reflection pattern comprises a groove formed in a forming direction that intersects the boundary line, and a cross section of the groove is V-shaped. The light guide plate of claim 1, wherein an angle formed between the light reflection pattern and the boundary line is greater than 0 ° and less than or equal to 22.5 °. A light guide body including a plurality of side surfaces, an upper surface, and a lower surface to form a three-dimensional shape, a first side from which light is incident, and an upper surface of the upper surface to have an angle that is not parallel to a first boundary line formed to meet the upper surface; A light guide plate formed by the light reflection pattern, the light guide plate including a first region and a second region darker than the first region, and including a second side surface included in the second region; A lamp assembly installed to face the first side, the lamp assembly including a lamp whose center is moved toward the second region with respect to the center of the light guide plate; And a liquid crystal display panel disposed under the light guide plate, the liquid crystal display panel comprising a pixel electrode reflecting light and a liquid crystal adjusting a transmittance of the reflected light. 10. The liquid crystal display device according to claim 9, wherein a second boundary line between the first side and the second side of the light guide plate and one end of the effective light emitting area of the lamp coincide with each other. The liquid crystal display of claim 10, wherein the one end of the effective light emitting area protrudes within 10 mm from the second boundary line. 10. The liquid crystal display device according to claim 9, wherein the second side surface is provided with light reproducing means for reproducing light toward the lower surface of the light guide plate. 13. The liquid crystal display device according to claim 12, wherein the light reproducing means is a reflective mirror with a smooth surface treatment. The light guide plate of claim 12, wherein a parting line is formed on the light guide plate, and the parting line is formed on any one of the second side on which the light reproducing means is formed and the other side except the first side on which light is incident. Liquid crystal display device characterized in that. 10. The liquid crystal display device according to claim 9, wherein a direction in which the light reflection pattern is formed and a direction in which the pixel electrode are formed are not parallel to each other. The method of claim 15, wherein the forming direction of the light reflection pattern and the forming direction of the pixel electrode are formed to be shifted at an angle of greater than 0 ° and 22.5 ° or less, and the directions of the first boundary line and the pixel electrode are parallel to each other. Liquid crystal display device characterized in that. delete

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