KR20040013821A - LCD device - Google Patents

Abstract

PURPOSE: A liquid crystal display is provided to uniformly transmit light emitted from a light source to a whole liquid crystal display by more certainly diffusing the light through the first diffusion part and the second diffusion part, thereby realizing uniform brightness. CONSTITUTION: An LED(Light Emitting Diode, 40), a light source is installed inside a frame(30) and provides light. A diffusion plate(50) integratedly has at least two more diffusion parts(52,54) diffusing the light emitted from the light source. The diffusion parts are formed vertically to a front direction of the light source at a predetermined gap. A liquid crystal display(60) is installed at a front end of the frame for displaying information by using the light passed through the diffusion plate.

Description

LCD device

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device for displaying a variety of information in electronic products.

As electronic products, display devices for displaying various kinds of information related to the operation or operation of the products are used. One type of display device is a liquid crystal display device using a liquid crystal display (LCD). 1 and 2 illustrate a configuration of a liquid crystal display device according to the prior art.

As shown in FIG. 1, a predetermined chamber 3 having an open front face is formed inside the frame 1 forming the skeleton of the liquid crystal display device. The inlet of the chamber 3 has a shape corresponding to the front shape of the liquid crystal display 10 to be described below. A plurality of light sources 5 are installed inside the chamber 3. LED is generally used as the light source 5. The inner wall surface of the chamber 3 forms a reflective surface 3 ', and is configured in a shape that gradually extends toward the inlet of the chamber 3 in the light source 5.

At the tip of the frame 1, a hook projection 7 is formed at a predetermined distance interval. The hanger 7 serves to hang the front lower end of the liquid crystal display 10. A plurality of terminal holes 9 are formed at the rear of the upper end of the frame 1.

The liquid crystal display 10 is installed at the inlet of the chamber 3 of the frame 1. The liquid crystal display 10 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 display 10 displays various information related to the operation of the electronic product. A connection terminal 11 is provided at an upper end of the liquid crystal display 10 to extend rearward through the terminal hole 9 of the frame 1. The connection terminal 11 serves to receive various information displayed on the liquid crystal display 10 from the main controller of the electronic product.

On the other hand, the diffusion sheet 13 is used so that the light emitted from the light source 5 is evenly spread and transmitted to the liquid crystal display 10. The diffusion sheet 13 is positioned between the light source 5 and the liquid crystal display 10, and is preferably mounted on the rear surface of the liquid crystal display 10. The shape of the diffusion sheet 13 is made to correspond to the liquid crystal display 10.

In the prior art having such a configuration, the signal transmitted to the liquid crystal display 10 through the connection terminal 11 displays electrical information as visual information by using a change in transmittance of the liquid crystal. In addition, illumination is performed by the light emitted from the light source 5 so that the user can visually see it. In this case, the diffusion sheet 13 allows light emitted from the light source 5 to be uniformly transmitted to the liquid crystal display 10.

However, the prior art as described above has the following problems.

The display device of the electronic product is the place where the user's eyes are the most focused, which greatly affects the appearance of the entire product. In particular, the appearance of the display device is beautiful when the light of the light source 5 shining on the liquid crystal display 10 is uniformly diffused by the diffusion sheet 13 during the use of the product, and the liquid crystal display 10 The information displayed can be accurately delivered to the user.

However, the conventional diffusion sheet 13 is relatively thin and consists of a sheet so that the light of the light source 5 is not diffused to the entire liquid crystal display 10. In particular, the distance between the light source 5 and the liquid crystal display 10 cannot be infinitely increased, and in particular, the part corresponding to the light source 5 is bright and the part which is not dark becomes dark when the overall view of the liquid crystal display 10 is performed. However, there is a problem that a difference in contrast occurs.

In order to improve this, the number of the light sources 5 per unit area must be further increased so that light is uniformly transmitted to the entire liquid crystal display 10. In this case, the cost of the product increases and power consumption increases.

In order to eliminate the partial difference in contrast, a method of reducing the amount of light emitted from the light source 5 as a whole can be considered. For example, there is a method of reducing the amount of light emitted from the light source 5 itself, which causes a problem that the screen of the liquid crystal display device shown to the user becomes dark and the user is inconvenient.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, and to maintain the brightness of the liquid crystal display as a whole uniform and above a certain value.

1 is an exploded cross-sectional view showing the configuration of a liquid crystal display device according to the prior art.

Fig. 2 is a front view showing the components constituting the liquid crystal display device according to the related art from the front, respectively.

3 is a cross-sectional view showing the configuration of a preferred embodiment of a liquid crystal display device according to the present invention;

4 is a perspective view showing the configuration of a diffusion plate constituting an embodiment of the present invention.

5 is a front view showing the components of the embodiment of the present invention in turn.

Explanation of symbols on the main parts of the drawings

30: frame 32: chamber

34: Reflective surface 36: Hanger

38: terminal hole 40: light source

42: connection terminal 50: diffuser plate

52: first diffusion unit 54: second diffusion unit

56: connecting portion 58: guide stones

According to a feature of the present invention for achieving the above object, the present invention provides a frame, a light source provided inside the frame and providing light, and at least two or more diffusion parts for diffusing the light from the light source And a diffuser plate integrally formed at predetermined intervals perpendicular to the light source front direction, and a liquid crystal display installed at the front end of the frame to display information by using light passing through the diffuser plate.

The diffusion plate is a translucent material formed by an injection operation, the first diffusion portion is installed perpendicular to the front direction of the light source, and the first diffusion portion at a predetermined interval in the front direction of the light source from the first diffusion portion And a second diffusion portion provided in parallel with the portion and a connection portion connecting the first and second diffusion portions.

A chamber in which the light source and the diffusion plate are provided is formed in the frame, and the chamber has a shape in which the cross-sectional area is gradually widened toward the front end of the frame.

The first diffusion part and the second diffusion part of the diffusion plate installed in the chamber are each formed to have an area corresponding to the cross-sectional area of the corresponding position of the chamber.

According to the present invention having such a configuration, since the light emitted from the light source is diffused and transmitted to the whole of the liquid crystal display while passing through the plurality of diffusion parts, the screen brightness of the liquid crystal display is generally uniform and brightened.

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

3 is a cross-sectional view of a preferred embodiment of a liquid crystal display according to the present invention, FIG. 4 is a perspective view of a diffuser plate constituting an embodiment of the present invention, and FIG. 5 is a front view of components of the present embodiment. Shown in turn.

As shown in these figures, the frame 30 serves as a bone of the liquid crystal display, and a chamber 32 is formed therein. The chamber 32 is configured in such a shape that its cross-sectional area becomes wider from the inside to the entrance corresponding to the tip of the frame 30. The inlet shape of the chamber 32 has a shape corresponding to the front shape of the liquid crystal display 60 to be described below. In this embodiment, as shown in FIG. 5, the inlet shape of the chamber 32 is a quadrangular shape formed long to the left and right. The inner wall surface of the chamber 32 serves as a reflecting surface 34 reflecting light from the light source 40 to be described below.

Hook frame 36 is formed in the frame 30 corresponding to the front lower end of the chamber (32). The hook protrusion 36 is a portion of the lower end of the liquid crystal display 60 to be described below. In addition, a plurality of terminal holes 38 are formed at the rear of the upper end of the frame 30.

The light source 40 is installed inside the chamber 32. The light source 40 is for backlighting the liquid crystal display 60, and as shown in FIG. 5, a plurality of light sources 40 are arranged at regular intervals. LED may be used as the light source 40. Reference numeral 42 is a connection terminal for supplying power to the light source 40.

The diffusion plate 50 is installed inside the chamber 32 to diffuse the light emitted from the light source 40. The diffusion plate 50 is injection molded of a translucent material, preferably made of milky translucent material. The diffusion plate 50 is integrally provided with a first diffusion unit 52 and a second diffusion unit 54 that diffuse light. The first and second diffusion parts 52 and 54 are installed in a direction perpendicular to the front direction of the light source 40, that is, the direction from the light source 40 toward the inlet of the chamber 32. The first diffusion unit 52 and the second diffusion unit 54 are vertically passed while being diffused. For reference, in the present embodiment, only the first and second diffusers 52 and 54 are shown as portions for diffusing the light, but the present invention is not necessarily the case, and various types of diffusers may be provided according to design conditions.

The first diffusion unit 52 and the second diffusion unit 54 are connected at both ends thereof through a connection unit 56. In addition, since the first diffuser 52 is relatively adjacent to the light source 40, the cross-sectional area of the chamber 32 is in a relatively small position, so that the first diffuser 52 is relatively smaller than the second diffuser 54. The area is formed small. Guide protrusions 58 are formed at the lower end of the second diffusion part 24 to correspond to the hook protrusion 36. The guide piece 58 is seated in a groove (not shown) formed in a portion corresponding to the hook projection 36 of the frame 20 to guide the installation position of the diffusion plate 50.

The liquid crystal display 60 is installed at the inlet of the chamber 32 of the frame 30. The liquid crystal display 60 displays various information related to the operation and control of the product. To this end, the upper end of the liquid crystal display 60 is provided with a connection terminal 62 for receiving information transmitted from the main controller. The connection terminal 62 is installed through the terminal through hole 38.

Hereinafter, the operation of the liquid crystal display device according to the present invention having the configuration as described above will be described in detail.

In order to operate the liquid crystal display of the present invention, it is transferred from the main controller to the liquid crystal display 60 through the connection terminal 62 of the liquid crystal display 60. The signal transmitted to the liquid crystal display 60 is represented by letters, numbers and symbols that can be seen by the user.

The light transmitted through the light source 40 illuminates the liquid crystal display 60 so that a user can see a signal displayed on the liquid crystal display 60. At this time, the light emitted from the light source 40 is diffused while passing through the first diffusion portion 52 and the second diffusion portion 54 of the diffusion plate 50 and evenly transmitted to the entire rear surface of the liquid crystal display 60. To be.

In particular, since light diffuses through the first and second diffusion parts 52 and 54 constituting the diffusion plate 50 and doubles, light is evenly transmitted to the entire rear surface of the liquid crystal display 60. A particular position, that is, a position corresponding to the front of the light source 40 becomes relatively brighter does not occur.

Therefore, even though the light of the light source 40 is relatively brighter, it is sufficiently diffused in the process of passing through the diffusion plate 50, and when viewed from the front of the liquid crystal display 60, the entire screen has a uniform brightness. Have. That is, a portion corresponding to the light source 40 is relatively bright and a part far from the light source 40 is darkened.

In other words, even if the intensity of the light emitted from the light source 40 is relatively high, it is sufficiently diffused in the process of passing through the first and second diffusers 52 and 54, so that the screen of the liquid crystal display 60 is uniform throughout. It means brighter.

On the other hand, in the diffusion plate 50 of the present invention, the first and second diffusion portions 52, 54 are provided in the chamber 32 in parallel with each other at regular intervals. This is because the first and second diffusers 52 and 54 are integrally formed so that once the diffuser plate 50 is correctly installed in the chamber 32, the diffusers 52 and 54 are provided with the light source ( It is accurately seated between the 40 and the liquid crystal display 60 at the same time.

The liquid crystal display device according to the present invention as described in detail above uses a diffusion plate having first and second diffusion portions to more reliably diffuse the light emitted from the light source.

Therefore, since the light emitted from the light source is diffused more reliably and is evenly transmitted to the whole of the liquid crystal display, the LCD display screen has a uniform brightness as a whole, and the light emitted from the light source is diffused relatively more, so that a brighter light source can be used. There is an advantage that can make it brighter.

In addition, since the first and second diffusion parts are integrally provided in the diffusion plate, if only the diffusion plate is properly assembled in the frame during the assembly process, the first and second diffusion parts are in the correct position, and thus, the assembling operation may be relatively easy.

Claims (4)

Frame, A light source installed in the frame and providing light; At least two diffusers for diffusing the light from the light source are integrally formed with a predetermined interval perpendicular to the light source front direction; And a liquid crystal display which displays information by using the light passing through the diffusion plate and is installed at the front end of the frame. The method of claim 1, wherein the diffusion plate is formed by injection molding as a translucent material, A first diffusion unit installed perpendicular to the front direction of the light source; A second diffusion unit provided in parallel with the first diffusion unit at a predetermined interval in a front direction of the light source from the first diffusion unit; And a connection part connecting the first and second diffusion parts. The chamber of claim 1 or 2, wherein a chamber in which the light source and the diffusion plate are provided is formed inside the frame, and the chamber has a shape in which the cross-sectional area is gradually widened toward the tip of the frame. Liquid crystal display device. 4. The liquid crystal display device according to claim 3, wherein the first diffusion part and the second diffusion part of the diffusion plate installed in the chamber are formed to have an area corresponding to the cross-sectional area of the corresponding position of the chamber.