JPH0449613Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid crystal display device in which a translucent liquid crystal plate is back-illuminated from the back surface of the liquid crystal panel by irradiation light emitted from a light guide. In particular, one light guide is divided into a plurality of light guide parts by forming slits that penetrate through its upper and lower surfaces, and a light source with a different emission color is arranged and housed in each light guide part to cause each light guide to shine. Accordingly, the present invention relates to a liquid crystal display device that can perform back illumination with different irradiation lights at the same time.

[Prior Art] A conventional liquid crystal display device, as shown in FIG.
The signal circuit to the liquid crystal board 51 is connected to the flexible printed circuit board 5.
2, and had a structure in which light was applied from the back side of the liquid crystal plate 51 to provide back illumination. This means that one light source 55 is provided for each light source accommodating portion 54 formed in a part of one transparent synthetic resin light guide 53.
A liquid crystal plate 51 is placed on top of the light guide 53 and housed inside a frame 56, and a cover 57 is placed over the top of the liquid crystal plate 51 to integrate the entire structure.

However, in the conventional liquid crystal display device described above,
Since there is only one light source 55, the light guide 53 can only be backlit with a single color, and it is impossible to backlight the light guide 53 with multiple colors at the same time. For this purpose, as shown in FIG.
3, 53, and 53 are different luminescent color light sources 5
5, 55, and 55 have been proposed in which the illumination is made to shine.

[Problem that the invention attempts to solve]

However, in the liquid crystal display device having the plurality of light guides 53, 53, 53, the plurality of light guides 53, 5
3, 53 and corresponding light sources 55, 55, 5
5 must be accommodated in a single small frame 56, the number of parts increases, the structure becomes complicated, and the assembly process becomes extremely complicated.

In addition, each light guide 5 may
3, 53, and 53 are displaced within the frame 56, and the light sources 55, 55, and 55 are displaced from the center position, making it impossible to hold the light sources 55, 55, and 55 in proper positions, and the illumination It also had the problem of causing unevenness.

The present invention was devised in view of the above-mentioned problems, and provides a liquid crystal display device that can prevent the occurrence of misalignment of the light guide and provide back illumination in multiple colors or in a single color simultaneously or separately. The purpose is to

[Means for solving problems]

In order to achieve the above object, a liquid crystal display device according to the present invention is a liquid crystal display device in which a liquid crystal plate is back-illuminated from the back side by irradiation light emitted from a light guide. 1 or 2 that penetrates the upper and lower surfaces, leaving a connecting part formed at the end.
The above slits are formed to divide the light guide into a plurality of independent light guide parts, and the light sources are arranged separately in the light source housing part formed intensively at the other end of each light guide facing the connection part. The gist is that it has been accommodated.

Further, the surface of the light guide can be covered with a filter in which a plurality of light-transmitting illumination windows are formed in a direction perpendicular to the slit of the light guide.

The slit of the light guide may be formed obliquely or curved along its longitudinal direction.

[Effect]

According to the liquid crystal display device having the above structure, the portion of each light guide adjacent to the light source where the brightness is highest is completely partitioned by the slit, so that the light emitted from each light source is This prevents the occurrence of uneven brightness by directing the incident light only to the light guide that is connected to the light guide, and also prevents the light that has entered each light guide from dispersing, and directs the incident light to the part of each light guide that is far away from the light source. can be transmitted.

In addition, with the above configuration, the liquid crystal panel can be back-illuminated from the back side simultaneously or in a particularly multicolor or single color, and if the light guide is covered with a filter having a translucent illumination window, the light source can be illuminated. It is also possible to backlight the liquid crystal display device in a matrix manner by reducing the number of lights.

〔Example〕

Embodiments of the liquid crystal display device according to the present invention will be described below with reference to the drawings.

In the drawing, 1 is a frame body, 2 is a light guide made of transparent synthetic resin with a large number of reflective protrusions or stipples 3, 3... formed on the back surface, 4 is a transflective plate, and 5 is a flexible printed circuit board. 6 is a translucent liquid crystal plate connected to it, and 7 is a cover that covers these members.

The inside of the frame 1 includes a portion that accommodates the light guide 2 and the transflective plate 4, and a liquid crystal panel 5 that is slightly wider than this.
It is formed by providing a step between the part that accommodates the

Then, the light guide 2, the transflective plate 4, and the liquid crystal plate 5 are sequentially superimposed and accommodated in the frame 1, and the light guide 2 is
The transflective plate 4 is placed in the lower part of the frame 1, and the liquid crystal plate 5 is placed in the upper part of the frame 1, and a cover 7 is placed over the top to integrate the whole. The liquid crystal display device constructed in this way is constructed so that back illumination can be performed by irradiation light emitted from the light guide 2 disposed on the back surface of the liquid crystal plate 5 having translucent properties.

The above-mentioned light guide 2 has an upper and lower surface of the light guide 2 in order to divide the illumination area into a plurality of independent light guide parts 2a, 2a, etc. arranged in parallel along the longitudinal direction of the light guide 2. Slits 2b, 2b, . . . are formed therethrough. In this embodiment, two slits 2b, 2b are formed in the light guide 2, and the light guide 2 is provided with two slits 2b, 2b.
is shown divided into three light guide portions 2a, 2a, 2a. At one end of each of the divided light guide parts 2a, a connecting part for connecting the light guide parts 2a, 2a... is formed, and a light source for illuminating each light guide part 2a is housed. The portion 2c is formed intensively at the other end opposite to the connecting portion, and each light source accommodating portion 2c, 2c, 2c accommodates a light source 8, 8, 8, respectively.

By turning on each light source 8, each light guide part 2a can be made to shine separately, and at the same time, in the part adjacent to each light source 8 and having the highest brightness, each light guide part 2a can be made to shine separately. light source 8
The light emitted from the light source 8 enters only the light guide section 2a corresponding to each light source 8, does not enter the other connected light guide sections 2a, and does not enter the light source 8 on the side of the adjacent light guide section 2a. It is possible to completely prevent uneven brightness caused by light incident from the slits 2b and the light dispersion effect that occurs when the light guide portions 2a are not completely partitioned by the slits 2b. The light incident on the light source 8 can be transmitted to a part remote from the light source 8.

Each of the light sources 8 extends from one side of a flexible printed circuit board 6 connected to the liquid crystal board 5, and extends to the back side of a valve chamber 9 formed on the back surface of the frame 1. The bulb sockets supporting each light source 8 are fitted and fixed into mounting holes provided on the bulb chamber 9 side. The other end 6b of the flexible printed circuit board 6 configured in this way is configured so that it can be connected to the connector 10 and power can be applied to the liquid crystal panel 5.

The light guide 2 includes a light source housing section 2 of each light guide section 2a.
The light source 8 housed in the light source accommodating part 2c is formed so that it is thick on the c side and gradually becomes thinner in the longitudinal direction away from the c side, and a large number of dots 3, 3... are formed on the lower surface of each light guide part 2a. It is configured so as to face the entire reflective surface formed by applying.

In this embodiment, each of the three light sources 8, 8, 8 is coated with a different color cap, such as a red, yellow, and green cap, in a desired arrangement order, and each guide is divided correspondingly. Light part 2
a, 2a, 2a are configured to shine in red, yellow, green, etc. Thus, the liquid crystal plate 5 located on the surface thereof can be back-illuminated with light of a desired plurality of colors.

In this embodiment, the light guide 2 is divided into three light guide parts 2a, 2a, 2a, but the number of divisions can be increased or decreased depending on the size and shape of the liquid crystal display device. Of course.

Furthermore, the direction in which the slits 2b, 2b are formed is
As shown in FIGS. 3 and 3, the shape is not limited to a straight line, and the light guide 2 may be inclined obliquely along the longitudinal direction of the light guide 2 or curved to form a desired illumination shape. Is possible.

FIG. 4 shows a second embodiment of the present invention, in which a plurality of light transmitting elements are arranged between the light guide 2 and the liquid crystal plate 5 in a direction perpendicular to the slits 2b, 2b of the light guide 2. The filter 11 is covered with a filter 11 in which light windows 11a, 11a, . . . are formed. This filter 1
1, the irradiated light from each light source 8, 8, 8 can exert a matrix-like illumination effect on the liquid crystal plate 5.

FIG. 5 shows another embodiment of the light guide 2, in which one end of the light guide 2 is formed into a chevron shape or a wave shape to change the luminous effect within the light guide 2. I can do it.

Furthermore, it goes without saying that the light guide can be used for backlighting text or graphic displays.

[Effect of idea]

Since the liquid crystal display device according to the present invention is configured as described above, it can perform back illumination in multiple colors at the same time or separately, improve its design, and have a single light guide.
Since it is a single sheet and is easy to handle, the parts assembly process can be performed easily and quickly.

Furthermore, since the liquid crystal plate and light source are securely integrated and fixed within the frame, the liquid crystal plate and light source can be held in the proper position within the liquid crystal display device, completely preventing the occurrence of uneven lighting, etc. The practical effects after implementation of this invention are extremely large.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a liquid crystal display device according to the present invention, FIG. 2 is a perspective view showing another embodiment of a light guide in which slits are formed obliquely, and FIG. FIG. 4 is a perspective view showing a light body in which the slits are formed in a curved shape, and FIG. Fig. 5 is a perspective view showing another embodiment of the light guide in which one end of the light guide is formed into a chevron shape, and Fig. 6 is a perspective view showing the conventional one.
FIG. 7 is an exploded perspective view showing a liquid crystal display device having two light guides, and FIG. 7 is a perspective view showing three conventional light guides and three light sources. 1... Frame body, 2... Light guide body, 2a... Light guide part,
2b...slit, 2c...light source housing section, 5...
Liquid crystal plate, 8...Light source, 11...Filter, 11
a... Translucent lighting window.

Claims (1)

[Claims for Utility Model Registration] (1) In a liquid crystal display device in which a liquid crystal panel is back-illuminated from the back side by irradiated light emitted from a light guide, the light guide is formed at one end. Leaving a connecting portion, one or more slits are formed through the upper and lower surfaces of the light guide to divide it into a plurality of independent light guide portions, and the light is concentrated at the other end of each light guide facing the connection portion. 1. A liquid crystal display device, characterized in that light sources are individually arranged and housed in light source housing portions formed in different shapes. (2) The liquid crystal display device according to claim 1, wherein the light source is covered with filters or color caps that emit light of different colors. (3) The liquid crystal display device according to claim 1 or 2 of the utility model registration claim, wherein the slit is formed in an oblique or curved shape. (4) Utility model registration claim 1 or 2, characterized in that the surface of the light guide is coated with a filter in which a plurality of translucent illumination windows are formed in a direction perpendicular to the slit of the light guide. The liquid crystal display device according to item 2.