JPH11133878A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently layout a display part for a prescribed size by providing a drive circuit arranged on a rear surface of a pedestal provided with the display part and generating a signal driving the display part. SOLUTION: A liquid crystal display device 1 is constituted of pixels 2 arranged in matrix, a reflection plate 3 becoming the pedestal arranging the pixels 2 on its surface side, the drive circuit 4 formed on the rear surface side of the reflection plate 3 and through holes 5 penetrating through the reflection plate 3 and respectively making crisscross signal lines and the drive circuit 4 in a conductive state. In such a constitution, the drive circuit 4 is constituted of a horizontal shift register mainly imparting a signal to respective wiring along the vertical direction in a display area and a vertical shift register imparting the signal to respective wiring along the horizontal direction in the display area. By forming these horizontal shift register and vertical shift register on the rear surface side of the reflection plate 3, the majority of a surface area in the reflection plate 3 is used as the display area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device which drives pixels arranged in a matrix to perform display.

[0002]

2. Description of the Related Art As a typical image display device having pixels arranged in a matrix, there is a liquid crystal display device. FIG.
Is a reflective TFT (Thin Film Transistor)
It is a schematic circuit diagram of a liquid crystal display device. In this liquid crystal display device, each of the pixels 2 arranged in a matrix is provided with a driving transistor Tr.

Each transistor Tr is driven by signals sent from a horizontal shift register 41 and a vertical shift register 42, and outputs an image signal corresponding to each pixel 2 to a liquid crystal L.
Give to C.

The driving circuits such as the horizontal shift register 41, the vertical shift register 42, and the H (horizontal) switch 43 are formed around the pixels 2 in a matrix. FIG. 6 is a schematic side view of a reflection type TFT liquid crystal display device,
FIG. 7 is a schematic plan view of a reflection type TFT liquid crystal display device.

That is, the horizontal shift register 41 and the vertical shift register 42 for driving the liquid crystal are formed around the display area of the reflection plate 3 on which the reflection film is formed.

[0006]

However, since the driving circuit including the horizontal shift register and the vertical shift register is provided around the display area as described above,
If the area of the reflector is determined, there is a problem that the area of the display area is reduced by the amount of the drive circuit.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve such problems. That is, the image display device according to the present invention generates a display unit in which pixels are arranged in a matrix, a base on which the display unit is arranged on its surface, and a signal arranged on the back surface of the base to drive the display unit. A drive circuit.

In the present invention, since the driving circuit is provided on the back surface of the base on which the display section is formed, it is necessary to provide the driving circuit on the front surface of the base on which the display section is formed. Thus, most of the surface of the base can be used as a display unit.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of an image display device according to the present invention. In the present embodiment, a description will be given of a reflective liquid crystal display device as an example of the image display device.

FIG. 1 is a schematic side view illustrating the liquid crystal display device according to the first embodiment, and FIG. 2 is a schematic plan view illustrating the liquid crystal display device according to the first embodiment.

That is, the liquid crystal display device 1 has pixels 2 arranged in a matrix, a reflector 3 serving as a base on which the pixels 2 are arranged on the front side, and a drive formed on the back side of the reflector 3. A circuit 4 and a through-hole 5 that penetrates through the reflector 3 and connects the vertical and horizontal signal lines and the drive circuit 4 to each other are provided.

Each pixel 2 has liquid crystal interposed in a predetermined gap formed by two glass substrates. Elements such as TFTs for driving liquid crystal are provided corresponding to each pixel 2.

The reflection plate 3 is, for example, a glass substrate on which a reflection film is deposited, and reflects light incident from the pixel 2 side so that display information by each pixel 2 can be referred to.

The driving circuit 4 mainly supplies a horizontal shift register 41 for applying a signal to each wiring in the display area 10 along the vertical direction in the figure, and a vertical shift register 41 for applying a signal to each wiring in the display area 10 along the horizontal direction in the figure. Shift register 4
And 2.

Since the horizontal shift register 41 and the vertical shift register 42 are formed on the back side of the reflection plate 3, most of the front surface side of the reflection plate 3 is covered with the display area 1.
It can be used as 0.

Each output of the horizontal shift register 41 and the vertical shift register 42 and each of the vertical and horizontal wirings provided on the front side of the reflector 3 are respectively connected by a plurality of through holes 5 penetrating the reflector 3. It is conducting.

The through holes 5 are formed so as to correspond to the vertical and horizontal wirings in the figure, and are provided, for example, in a vertical line and a horizontal line inside the display area 10. Note that the through hole 5 may be provided outside the display area 10.

Each of the through holes 5 is not electrically connected to a reflection film (not shown) formed on the reflection plate 3. That is, after the reflection film is formed on the reflection plate 3, the reflection film is removed slightly larger than the through hole 5 only at the portion where the through hole 5 is disposed, so that each through hole 5 and the reflection film are not conducted. Will be done.

The signals output from the horizontal shift register 41 and the vertical shift register 42 formed on the back surface of the reflection plate 3 by the through holes 5 are as follows.
A signal is given to the wiring on the front side of the reflector 3 along the vertical and horizontal directions in the figure through the through hole 5, and each pixel 2 of the display area 10 can be driven from the back side of the reflector 3. .

That is, the drive circuit 4 including the horizontal shift register 41 and the vertical shift register 42 does not exist on the surface of the reflection plate 3, and the display area 10 provided on the surface side of the reflection plate 3 can be enlarged. it can.

Next, a second embodiment will be described. FIG. 3 is a schematic side view illustrating the liquid crystal display device according to the second embodiment, and FIG. 4 is a schematic plan view illustrating the liquid crystal display device according to the second embodiment.

That is, in the liquid crystal display device 1 according to the second embodiment, the pixels 2 arranged in a matrix, the reflector 3 on which the pixels 2 are arranged on the front side, and the drive formed on the back side of the reflector 3 The fourth embodiment is similar to the first embodiment in that the second embodiment has a circuit 4, but includes a routing wiring 6 formed along the edge of the reflection plate 3 to make the vertical and horizontal signal lines and the driving circuit 4 conductive. Are different.

Each pixel 2 has a liquid crystal sandwiched in a predetermined gap formed by two glass substrates. Elements such as a TFT for driving a liquid crystal are provided corresponding to each pixel 2.

The reflection plate 3 is formed, for example, by depositing a reflection film on the surface of a glass substrate, and reflects light incident from the pixel 2 side so that display information by each pixel 2 can be referred to.

The drive circuit 4 mainly supplies a horizontal shift register 41 that supplies a signal to each wiring in the display area 10 along the vertical direction in the figure, and supplies a signal to each wiring in the display area 10 along the horizontal direction in the figure. And a vertical shift register 42.

Further, a routing wiring 6 for conducting each output of the horizontal shift register 41 and the vertical shift register 42 to each of the vertical and horizontal wirings provided on the surface side of the reflection plate 3 in the drawing.
Is formed of, for example, a transparent electrode (ITO).

The routing wiring 6 is formed corresponding to each of the vertical and horizontal wirings in the drawing, and is provided, for example, on the left side edge and the lower side edge of the display area 10 in the drawing.

The signals output from the horizontal shift register 41 and the vertical shift register 42 formed on the back surface of the reflection plate 3 by the respective wirings 6 are transmitted through the reflection plate 3 via the wirings 6. A signal can be given to the wiring on the front side of the drawing along the vertical and horizontal directions in the figure, and each pixel 2 of the display area 10 can be driven from the back side of the reflection plate 3.

That is, similarly to the first embodiment, the driving circuit 4 including the horizontal shift register 41 and the vertical shift register 42 does not exist on the surface of the reflection plate 3, and
The display area 10 on the surface side of the reflection plate 3 can be enlarged.

In both the first and second embodiments, the arrangement positions of the through-holes 5 and the lead-out lines 6 for conducting the drive circuit 4 on the back side of the reflector 3 and the vertical and horizontal lines on the front side are described above. It is not limited to what was done.

In each of the embodiments, the drive circuit 4 is formed on the back surface side of the reflection plate 3. However, the drive circuit 4 is formed by a separately packaged IC of the horizontal shift register 41 and the vertical shift register 42. The IC may be mounted on the back side of the reflection plate 3.

In the above embodiments, the reflection type liquid crystal display device 1 has been described as an example. However, other than this, a self-luminous display device such as a plasma display device or LE
The present invention can be applied to a D display device.

[0033]

As described above, the image display device of the present invention has the following effects. That is, since the driving circuit is provided on the back surface of the base on which the display unit is formed on the front surface, the driving circuit does not exist on the front surface of the base, and most of the surface of the base is used as the display unit. It can be used. Thereby, the area ratio of the display unit to the area of the base can be increased, and the display unit can be efficiently laid out for a predetermined size.

[Brief description of the drawings]

FIG. 1 is a schematic side view illustrating a first embodiment.

FIG. 2 is a schematic plan view illustrating the first embodiment.

FIG. 3 is a schematic side view illustrating a second embodiment.

FIG. 4 is a schematic plan view illustrating a second embodiment.

FIG. 5 is a schematic circuit diagram of a reflection type TFT liquid crystal display device.

FIG. 6 is a schematic side view of a conventional reflective TFT liquid crystal display device.

FIG. 7 is a schematic plan view of a conventional reflective TFT liquid crystal display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device, 2 ... Pixel, 3 ... Reflector, 4 ... Drive circuit, 5 ... Through-hole, 6 ... Wiring wiring, 10 ... Display area, 41 ... Horizontal shift register, 42 ... Vertical shift register

Claims (3)

[Claims] 1. A display unit in which pixels are arranged in a matrix, a base on which the display unit is arranged, and a drive circuit arranged on the back surface of the base to generate a signal for driving the display unit An image display device comprising: 2. The image display device according to claim 1, further comprising a through hole formed to penetrate the base and to conduct the signal from the drive circuit to the display unit. 3. The image display device according to claim 1, further comprising a routing line formed along an edge of the base and for conducting the signal from the drive circuit to the display unit.