KR20090072874A - Optical plate, backlight unit and liquid crystal display device having the same - Google Patents

Abstract

An optical plate, a backlight unit and a liquid crystal display device by simplifying a structure are provided to improve assembling efficiency by using the optical plate capable of uniformly irradiating the light the LCD panel. Light is income in an incident unit(135) consisting of one side. A light correcting unit consisting of an upper side condenses the light which is income from the incident unit. A light guide unit is made of the other side surface except for the incident unit. The light guide unit guides the light which is income from the incident unit in the direction of the light correction. A semi-fluid material is injected between the incident unit, and the light correction.

Description

Optical plate, backlight unit and liquid crystal display using the same {OPTICAL PLATE, BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical plate, and more particularly, to an optical plate in which various functions are integrated, a backlight unit and a liquid crystal display using the same.

CRT (Cathode Ray Tube), one of the widely used display devices, is mainly used for monitors such as TVs, measuring devices, information terminal devices, etc., but due to the weight and size of the CRT itself, the miniaturization and weight reduction of electronic products Could not actively respond to the response.

As a solution to this problem, the liquid crystal display device has an advantage that it is possible to realize a light and short and small power consumption compared to the CRT. In particular, liquid crystal displays using thin film transistors have been used in various fields in the notebook PC and monitor market as well as in recent years since they have achieved high quality, large size, and color display screen comparable to CRTs.

In general, a liquid crystal display device applies a voltage to a specific molecular array of a liquid crystal to convert it into another molecular array, and changes optical properties such as birefringence, ray photometry, dichroism, and light scattering characteristics of the liquid crystal cell emitted by the molecular array. It is a light receiving type display apparatus which visually converts and displays information using the modulation of the light by a liquid crystal cell.

Since the liquid crystal display is a light receiving device, the liquid crystal display includes a backlight unit that provides light to express an image.

The backlight unit is classified into a direct type and an edge type according to the arrangement of the light sources. The direct type backlight unit is a method in which a plurality of light sources are disposed at regular intervals directly below the liquid crystal display panel to directly irradiate directly under the liquid crystal display panel, and the edge type backlight unit converts light emitted from the light source into surface light. It is a method of irradiating light to a liquid crystal display panel by a light guide plate.

The edge type backlight unit includes optical sheets including a diffusion sheet, a plurality of light collecting sheets, a protective sheet, and the like in order to improve optical characteristics of light emitted from a light source, for example, luminance uniformity and front luminance.

Conventional liquid crystal display device has a light guide plate and a plurality of optical sheets for irradiating uniform light to all regions of the liquid crystal display panel from the light source disposed on the side of the backlight unit, the assembly is deteriorated due to various configurations There was.

In addition, the light guide plate and the plurality of optical sheets have a problem in that the edge regions of the light guide plate and the plurality of optical sheets are damaged by friction with a support main made of a mold for storing.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical plate having a property that is not damaged even by an external impact.

In addition, an object of the present invention is to provide a backlight unit and a liquid crystal display device which can improve the assemblability.

Optical plate according to an embodiment of the present invention,

An incident part formed of one side to receive light; A light compensator configured to have an upper surface to diffuse and focus light incident from the incident part; A light guide part including other side surfaces and a lower surface except the incident part to guide the light incident from the incident part toward the light correcting part; And a semi-fluid material injected into the incident part, the light compensating part, and the light guide part.

In addition, the backlight unit according to another embodiment of the present invention,

A light source for emitting light; And an incident part to which light emitted from the light source is incident, a light compensating part to diffuse and focus light incident from the incident part, and a light guide part to guide light incident from the incident part toward the light compensating part. And an optical plate made of a semi-fluid material injected between the incident part, the light compensating part, and the light guide part.

In addition, the liquid crystal display device according to another embodiment of the present invention,

A light source for emitting light; An incident part to which the light emitted from the light source is incident, a light correcting part to diffuse and focus light incident from the incident part, a light guide part to guide the light incident from the incident part toward the light correcting part; An optical plate made of a semi-fluid material injected between the incident part, the light compensating part and the light guide part; And a liquid crystal display panel disposed on the optical plate.

The present invention eliminates the conventional optical sheets and the light guide plate, and includes an optical plate capable of uniformly irradiating the light emitted from the light source toward the liquid crystal display panel to improve the assemblability and to simplify the structure. And light weight.

In addition, the optical plate of the present invention can improve the problem that the optical guide portion having a constant elasticity, and the semi-fluid material injected therein can function as a shock absorber and broken by an external impact.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention.

1 is an exploded perspective view illustrating a liquid crystal display device having an optical plate according to an exemplary embodiment of the present invention, FIG. 2 is an exploded perspective view illustrating the optical plate of FIG. 1, and FIG. 3 is a Ⅰ-I of FIG. 1. Is a cross-sectional view showing an optical plate cut along a line.

1 to 3, the liquid crystal display according to the exemplary embodiment of the present invention is provided with a liquid crystal display panel 110 on which an image is displayed and disposed on a rear surface of the liquid crystal display panel 110 to provide light. It includes a backlight unit 120 to.

Although not shown in detail in the drawing, the liquid crystal display panel 110 includes a thin film transistor substrate and a color filter substrate bonded together with a liquid crystal layer (not shown) therebetween.

The thin film transistor substrate and the color filter substrate will be described in more detail. The thin film transistor substrate has a plurality of gate lines and data lines intersecting to define pixels, and a thin flim transistor (TFT) is provided in each crossing area. And one-to-one correspondence with the pixel electrode mounted on each pixel.

The color filter substrate includes, for example, color filters of R, G, and B colors corresponding to each pixel, a black matrix bordering each of them, and covering a gate line, a data line, a thin film transistor, and the like, and a common electrode covering all of them. do.

One side of the liquid crystal display panel 110 includes a liquid crystal display panel driver (not shown) mounted with a driving circuit for supplying a driving signal to the liquid crystal display panel 110 in a step (not shown) formed of a tape carrier package (TCP). Can be electrically connected by

The liquid crystal display panel driver is electrically connected to the liquid crystal display panel 110 to supply a control signal and a data signal to a plurality of gate lines and data lines formed in the liquid crystal display panel 110, thereby providing a liquid crystal display panel 110. Drive the pixels.

When the liquid crystal display panel 110 controls the voltage of the data signal applied to the pixel electrode in a state where a voltage is applied to the common electrode, the liquid crystal exhibits dielectric anisotropy according to an electric field between the common electrode and the pixel electrode. By rotating it, light is transmitted or blocked for each pixel to display an image.

The backlight unit 120 for providing light to the liquid crystal display panel 110 includes a bottom cover 190 having an upper surface opened, a light source 150 disposed at one side of the bottom cover 190 to emit light, and An optical plate 130 disposed to form one surface with the light source 150 to convert the light incident from the light source 150 into surface light, and to diffuse and collect the light; and an optical plate 130 disposed below the optical plate 130. The reflective sheet 170 reflects light traveling in the lower direction of the liquid crystal display panel 110.

Although not shown in the drawing, the backlight unit 120 may further include a square main shape support main (not shown) for modularizing the light source 150, the optical plate 130, and the reflective sheet 170 into one.

As the light source 150 emits light, a cold cathod fluorescent lamp (CCFL) and an external electrode fluorescent lamp (EEFL) are used. In the present invention, the light source 150 is limited to a lamp, but the present invention is not limited thereto. A light emitting diode (LED) may be provided.

The optical plate 130 includes an incident part 135 through which light is incident, a light compensating part 131 for diffusing and condensing incident light, and an optical compensating part 131 as well as preventing the loss of the incident light. It includes a light guide portion 133 to guide in the direction.

The incident part 135 is made of a material having excellent light transmittance. For example, the incident part 135 is made of polymethyl methacrylate (PMMA) material. Other materials may also be used.

The incident part 135 includes a role of diffusing. That is, the incident part 135 is excellent in light transmittance and preferably made of a material for diffusing light.

The light compensator 131 includes a first layer 131b for diffusing light and a second layer 131a for condensing light.

The first and second layers 131b and 131a are integrally formed. On the other hand, the first and second layers 131b and 131a may be attached to each other using an adhesive material.

The second layer 131a is formed with a prism pattern having peaks and valleys on its lower surface.

The light guide part 133 is formed in a wedge shape in which the thickness decreases as it moves away from the light source 150.

Although not shown in the drawing, a prism pattern having peaks and valleys for guiding light to the light compensator 131 may be formed on a lower surface of the light guide part 133.

The light guide part 133 reflects the light incident from the incident part 135 toward the light correcting part 131. That is, the light guide portion 133 is preferably made of a reflective material.

The light guide part 133 is made of a plastic material having a certain elasticity.

The semi-fluid material 137 is injected into the incident part 135, the light compensating part 131, and the light guide part 133.

Semi-fluid material 137 is mixed with a plurality of beads 139 to change the light path.

In the optical plate 130 of the present invention described above, the semi-fluid material 137 is injected while the light compensating part 131 and the light guide part 133 are bonded to each other, and the incident part 135 is formed of the light. It is assembled in the form of being fixed to the correction unit 131 and the guide unit 133.

The liquid crystal display according to the exemplary embodiment of the present invention described above removes the conventional optical sheets and the light guide plate, and an optical plate capable of uniformly irradiating the light emitted from the light source 150 to the liquid crystal display panel 110. In addition to the 130 to improve the assemblability, the structure is simplified to have an advantage in slim and light weight.

In addition, the optical plate 130 of the present invention has a problem that the light guide portion 133 having a constant elasticity and the semi-fluid material 137 injected therein can function as a shock absorber and thus be damaged by external shocks. It can be improved.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is an exploded perspective view illustrating a liquid crystal display device having an optical plate according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view illustrating the optical plate of FIG. 1. FIG.

3 is a cross-sectional view illustrating an optical plate cut along the line II ′ of FIG. 1.

Claims (17)

An incident part formed of one side to receive light; A light compensator configured to have an upper surface to diffuse and focus light incident from the incident part; A light guide part including other side surfaces and a lower surface except the incident part to guide the light incident from the incident part toward the light correcting part; And And an anti-fluid material injected between the incident part, the light compensating part and the light guide part. According to claim 1, And the light compensator comprises a first layer for diffusing light and a second layer for condensing light. The method of claim 2, And a prism pattern having peaks and valleys is formed on a lower surface of the second layer. According to claim 1, The semi-fluid material includes beads that diffusely reflect light. According to claim 1, And a prism pattern having peaks and valleys formed on a lower surface of the light guide portion. A light source for emitting light; And An incident part to which the light emitted from the light source is incident, a light correcting part to diffuse and focus light incident from the incident part, a light guide part to guide the light incident from the incident part toward the light correcting part; And an optical plate made of a semi-fluid material injected between the incident part, the light compensating part and the light guide part. The method of claim 6, And the incident part is located on one side of the optical plate, the light compensating part is located on an upper surface of the optical plate, and the light guide part is located on other side surfaces and a lower surface except for the incident part. The method of claim 6, And the light compensator comprises a first layer for diffusing light and a second layer for condensing light. The method of claim 8, And a prism pattern having peaks and valleys is formed on a lower surface of the second layer. The method of claim 6, And the semi-fluid material includes beads which diffusely reflect light. The method of claim 6, And a prism pattern having peaks and valleys is formed on a lower surface of the light guide portion. A light source for emitting light; An incident part to which the light emitted from the light source is incident, a light correcting part to diffuse and focus light incident from the incident part, a light guide part to guide the light incident from the incident part toward the light correcting part; An optical plate made of a semi-fluid material injected between the incident part, the light compensating part and the light guide part; And And a liquid crystal display panel disposed on the optical plate. The method of claim 12, Wherein the incidence part is located on one side of the optical plate, the light compensating part is located on an upper surface of the optical plate, and the light guide part is located on other side surfaces and a lower surface except for the incidence part. The method of claim 12, And the light compensator comprises a first layer for diffusing light and a second layer for condensing light. The method of claim 14, And a prism pattern having peaks and valleys is formed on a lower surface of the second layer. The method of claim 12, And the semi-fluid material includes beads which diffusely reflect light. The method of claim 12, And a prism pattern having peaks and valleys formed on a lower surface of the light guide portion.

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