JPH11149072A - Liquid crystal display module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display module having back illumination and capable of inexpensively making the module thin. SOLUTION: By printing a reflection material made of resin capable of silk printing as a reflection body 15 over a range equivalent to/larger than the area of a display region on the front surface on the side of a liquid crystal display panel 17 of a printed board 16, the reflection body 15 made of the reflection material is formed so as to become the state integrated with the printed board 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight-equipped liquid crystal display module used as a display device for displaying an image.

[0002]

2. Description of the Related Art Conventionally, as a display device for displaying an image, an OA device or the like displays an image in a display area of a liquid crystal display panel, and light emitted from a light source is reflected by a reflection material reflected by a reflective material. 2. Description of the Related Art A backlit liquid crystal display module configured to illuminate a liquid crystal display panel from the back is widely used.

A conventional liquid crystal display module with backlight will be described with reference to FIG. In FIG.
Is a cold-cathode tube as a light source that emits light for screen illumination, 22 is a light guide plate that is a path of light emitted from the cold-cathode tube 21 as a light source, and 23 is for diffusion correction of luminance unevenness on an irradiation surface on the screen. Diffusion plates 24 and 25 are reflection plates that reflect light emitted from the cold-cathode tube 21 as a light source in a necessary direction in order to use the light efficiently, and 26 is a base of a liquid crystal display module and is used for a liquid crystal display circuit. Printed circuit boards on which electronic components are mounted,
Reference numeral 27 denotes a liquid crystal display panel which forms a screen for displaying an image by driving the liquid crystal.

In the liquid crystal display module with the back illumination configured as described above, light emitted from the cold-cathode tube 21 as a light source is reflected by the reflection plates 24 and 25 as shown by arrows in FIG. The light is transmitted through the light guide plate 22 while passing through the diffusion plate 23 to uniformly irradiate the display area of the liquid crystal display panel 27 from the back surface thereof.

[0005]

However, in the above-mentioned conventional liquid crystal display module, the reflection plates 24 and 25 are not provided.
Are formed of resin sheets, each having a thickness of 0.2 mm or more on the reflection plate 24 side and a thickness of 0.2 mm on the reflection plate 25 side.
mm or more, which hinders the thinning of the liquid crystal display module.

The present invention solves the above-mentioned conventional problems, and provides a liquid crystal display module having back lighting and capable of realizing a thin module at low cost.

[0007]

In order to solve the above-mentioned problems, a liquid crystal display module according to the present invention is characterized in that a reflective material made of a silk-printable resin is provided on a surface of a printed circuit board on a liquid crystal display panel side in an area of a display area. By printing over a range equal to or greater than the above, the reflective material is integrated with the printed circuit board.

As described above, it is possible to realize a low-cost module with back lighting and a thin module.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal display module according to a first aspect of the present invention displays an image on a display area of a liquid crystal display panel disposed on a printed circuit board, and is disposed outside the display area. A back light-equipped liquid crystal display module configured to illuminate the liquid crystal display panel from the back surface with reflected light reflected by a reflective material having a light reflecting function, wherein the reflected light is emitted from a light source. Is formed on the surface of the printed circuit board on the liquid crystal display panel side over a light source side area which is substantially equal to or larger than the display area of the liquid crystal display panel.

[0010] The liquid crystal display module according to claim 2 is
The reflective material according to claim 1 is formed on a printed circuit board surface by silk printing. According to the above configuration, the reflective material made of silk-printable resin is printed on the surface of the printed circuit board on the side of the liquid crystal display panel over a range equal to or greater than the area of the display area, thereby integrating the reflective material with the printed circuit board. I do.

Hereinafter, a liquid crystal display module according to an embodiment of the present invention will be specifically described with reference to the drawings. Here, similarly to the conventional example shown in FIG. 2, a liquid crystal display module with back lighting will be described.

FIG. 1 is a sectional view showing the structure of a liquid crystal display module with back illumination according to the present embodiment. In FIG. 1, reference numeral 11 denotes a cold cathode tube as a light source, 12 denotes a light guide plate, 1
3 is a diffusion plate, 14 is a reflection plate, 16 is a printed circuit board, 17
Denotes a liquid crystal display panel. These functions are the same as those of the conventional example shown in FIG. 2, and therefore detailed description is omitted here.

Reference numeral 15 denotes a reflector, which is formed by applying a silk-printable resin such as an epoxy-based or silicon-based resin containing a white pigment on a surface of the printed circuit board 16 on the side of the liquid crystal display panel 17 in a display area thereof. The reflector 15 made of the above-described reflective material is formed so as to be integrated with the printed board 16 by printing over a range up to the area where the cold cathode tubes 11 are disposed, which is equal to or larger than the area of the cold cathode tube 11. can do.

The operation of the liquid crystal display module with the back illumination configured as described above will be described below. First, the emitted light emitted from the cold-cathode tube 11 as a light source is either directly or as shown by an arrow in FIG.
4, the light is transmitted through the light guide plate 12 and the reflector 1
While being repeatedly reflected by 5, the light is uniformly irradiated on the liquid crystal display panel 17 after being diffusion-corrected by the diffusion plate 13, and the display area is illuminated from the back.

As described above, it is possible to reduce the thickness of the module (actually, about 0.4 mm was realized) with back lighting and at low cost.

[0016]

As described above, according to the present invention, a reflective material made of a silk-printable resin is printed on a surface of a printed circuit board on a liquid crystal display panel side over an area equal to or greater than the area of the display area. The reflective material can be integrated with the printed circuit board.

[0017] Therefore, it is possible to realize a low-cost module with back lighting and at a low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a liquid crystal display module according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a conventional liquid crystal display module.

[Explanation of symbols]

 11, 21 Cold cathode tube 12, 22 Light guide plate 13, 23 Diffusion plate 14, 24, 25 Reflector 15 Reflector 16, 26 Printed circuit board 17, 27 Liquid crystal display panel

Claims (2)

[Claims] 1. An image is displayed on a display area of a liquid crystal display panel provided on a printed circuit board, and light emitted from a light source provided outside the display area is reflected by a reflective material having a light reflecting function. A liquid crystal display module with back illumination configured to illuminate the liquid crystal display panel from the back side with the reflected light, wherein the reflective material is
A liquid crystal display module, wherein the liquid crystal display module is formed on a surface of the printed circuit board on a liquid crystal display panel side, over a light source side area substantially equal to or larger than a display area of the liquid crystal display panel. 2. The liquid crystal display module according to claim 1, wherein the reflective material is formed on the surface of the printed circuit board by silk printing.