JPH05281479A - Display device - Google Patents

Abstract

PURPOSE:To provide the power-saving type display device which is suitable for a large-screen display. CONSTITUTION:Plural reflecting members 9 are arranged on the back surface of a light interference generating member 4 which causes interference with the reflecting members, and those reflecting members 9 and light interference generating member 4 are fitted mutually across piezoelectric elements 5 which vary the gaps between both the members according to an applied voltage; and interference colors are controlled by adjusting the applied voltage to obtain desired colors when the display is viewed from the front surface side at a specific angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power saving type display device suitable for a large screen display.

[0002]

2. Description of the Related Art Recently, a display having a very large screen is provided on the street. Such a large-screen display displays various images by controlling the light emission of the pixels forming the screen. In addition, it seems that liquid crystal displays, which consume relatively little power, have recently been used.

[0003]

However, in such a conventional display device, a light emitting type device requires a certain amount of light emission because it is required to be viewed from a distance. Therefore, the size of the pixel inevitably becomes large, which causes a problem that the resolution is lowered and the power consumption becomes very large.

In addition, although the liquid crystal type is satisfactory in terms of power consumption, it is difficult to produce intermediate colors because the colorization is performed by using a color filter.
There is also a drawback that the structure is complicated and expensive. Further, since the liquid crystal is manufactured by using a fine processing technique, it has a drawback that it is not suitable for a large screen.

The present invention has been made in order to solve such conventional problems, and an object thereof is to provide a display device which consumes less power and is suitable for a large screen.

[0006]

SUMMARY OF THE INVENTION The present invention for achieving the above object comprises a mirror-like reflecting member for reflecting white light.
It is characterized in that transparent optical interference forming members which cause optical interference in a gap formed between the reflecting member and the reflecting member are arranged to face each other.

The reflecting member and the light interference forming member are
It is characterized in that they are attached to each other via a piezoelectric element that changes the gap between the two members in accordance with the applied voltage.

[0008]

In the present invention having the above-mentioned structure, the color to be displayed can be expressed by adjusting the distance between the reflecting member and the light interference forming member, and the color is generated by the interference of natural light. As a result, the power required for display is only the amount of power supplied to the piezoelectric element. In addition, a large screen can be dealt with by increasing the number of reflecting members, so that it becomes possible to flexibly meet the demand for the screen size.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an external view showing a part of a display device according to the present invention when viewed from the front. As shown in FIG. 1, the display device 1 has a structure in which a large number of independent circular elements 2 are arranged vertically and horizontally. 1 of this element 2
Each one constitutes a pixel, but unlike a normal CRT display, one pixel 2 outputs various colors by a light interference phenomenon.

An example of a mechanism for forming each pixel 2 is shown in FIG.
It is shown in. A glass 3 functioning as a light interference forming member is attached to the front side of the display device 1. A transparent conductive film 4 is formed on the rear surface side of the glass 3. Then, on the rear surface side of the glass 3, one side of the piezoelectric element 5 having a predetermined size is brought into contact with the conductive film 4, and the glass element is distorted in the front-rear direction with respect to the glass surface in accordance with the applied voltage. Install it in such a direction. And glass 8
A transparent conductive film 7 similar to the above is formed on one surface of
A member 9 having a surface formed of silicon or the like and functioning as a reflecting member is attached to this. Further, the other end of the piezoelectric element 5 is attached to the side of the glass 8 on which the conductive film 7 is formed so that the conductive film 7 is in contact therewith. At this time, the member 9 is prevented from coming into contact with the piezoelectric element 5. The conductive film 4 is connected to the ground, and the conductive film 7 is connected to a piezoelectric element group voltage control unit, which will be described later, which applies a voltage to each of the piezoelectric elements 5 independently for each pixel.

The interference color is generated by such a structure for the following reason. If the gap between the mirror-finished silicon and the glass is set to a very small value (on the order of several hundreds of nanometers), the light incident through the glass and the light reflected by the silicon cause interference, which causes the glass An interference color is generated between the silicon and the silicon. In other words, this feeling of color is created by subtracting the part that disappears due to the canceling interference between the incident light and the reflected light.

FIG. 3 is a block diagram showing the configuration of a control system for driving the display device of the present invention. Memory 1
In 0, image information for each pixel used when displaying a still image on the display device 1 and image information for colorizing the image are stored. In other words, this image information is information about what color is output to which pixel, and more specifically, information about the voltage to be applied to the piezoelectric element forming each pixel corresponding to the color to be expressed. .. External device 11
Is a television tuner, a VTR, or the like, and a color image signal is output from the external device 11. When displaying a still image based on the image information stored in the memory 10, the CPU 12 determines which voltage should be applied to which piezoelectric element based on the image information and the image information for colorization. On the other hand, when displaying a moving image, the colorization information stored in the memory 10 is referred to based on the color image signal output from the external device 11 to determine which piezoelectric element and to what extent. Is calculated. The piezoelectric element group voltage controller 13 applies a voltage to each piezoelectric element forming the piezoelectric element group 5 based on the calculation result of the CPU 12.

The display device according to the present invention having the above-described structure displays color in the following manner. First, assuming that a signal related to a color image is input from the external device 11 to the CPU 12, the CPU 12 calculates the voltage to be applied to each piezoelectric element 5 from the information stored in the memory 10 based on this color signal. For example, in FIG. 2, for each of the three pixels A, B, and C, it is assumed that the signals to be displayed are red for A, green for B, and metal for C, respectively. In the information stored in
Assuming that 1.0V is assigned to display red, 0.8V is assigned to represent green, and 0V is assigned to represent metal color.
2 calculates the voltage of what voltage should be applied to which piezoelectric element while taking into consideration the contents of the memory based on the input image signal. The calculation result is the piezoelectric element group voltage control unit 13
Will be output to. The piezoelectric element group voltage controller 13 applies this voltage to each piezoelectric element based on the input calculation result.

When this voltage is applied, the piezoelectric element expands and contracts in the glass surface direction according to the applied voltage.
In this embodiment, the amount of contraction of the piezoelectric element increases as the applied voltage increases. Therefore, 1.0
In the pixel A to which the voltage of V is applied, the deformation ratio of the piezoelectric element 5 is the largest among the piezoelectric elements forming the three pixels, and the gap between the silicon surface and the glass surface is the largest among the three pixels. The biggest. The gap between the silicon surface and the glass surface at this voltage is set in advance at the design stage so that it can be seen from the outside that the silicon surface is emitting red light. Similarly, the deformation of the piezoelectric element that constitutes the pixel B is only an amount corresponding to the applied voltage of 0.8 V, and the gap between the silicon surface and the glass surface is different from that of a person who looks at the pixel at an angle from the outside. Is set to a distance that makes it appear to glow green. Furthermore, since no voltage is applied to the pixel C, the silicon surface remains in contact with the glass surface, and the metallic color (color of silicon itself) is visible from the outside.

In forming each pixel, the color generated by the silicon surface changes even with a very slight plane error with respect to the glass surface, so that the parallelism between the glass surface and the silicon surface is very high. It is necessary to set in. In addition, as the screen becomes larger, it is necessary to maintain the strength of the framework that supports the members forming these pixels. As described above, in the display device of the present invention, an image is generated by utilizing the interference color generated by the gap between the silicon surface and the glass surface and the natural light. Therefore, the power required for the display is that of the conventional large screen. Remarkably less than. In addition, when configuring a large screen, it is only necessary to increase the number of members that configure this pixel and increase the number of voltage controls applied to the piezoelectric elements that configure this pixel. You will be able to do it. Further, it becomes possible to easily control the intermediate color, which is difficult in the liquid crystal display, by finely adjusting the voltage applied to the piezoelectric element.

Since the display device of the present invention uses the reflection of the silicon surface by natural light to generate an image, it cannot display at night without light. However, if the display device is illuminated from the side surface side, an image similar to that in the daytime can be obtained, although the display color changes slightly depending on the characteristics of the illumination light.

[0017]

As described above, according to the present invention, the color to be displayed is expressed by adjusting the distance between the reflection member and the light interference forming member, so that the power required for display is very high. Less. In addition, to support a large screen,
Since it can be dealt with by increasing the number of reflecting members, it becomes possible to flexibly meet the demand for the screen size.

[Brief description of drawings]

FIG. 1 is a partial external view of a display device according to the present invention.

FIG. 2 is a specific configuration diagram of a pixel of the pixel of the device shown in FIG.

FIG. 3 is a schematic block diagram of a control unit that causes the apparatus shown in FIG. 1 to generate an image.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Display device 2 ... Pixel 3, 8 ... Glass (light interference forming member) 4, 7 ... Transparent electrode 5 ... Piezoelectric element 9 ... Member having silicon or the like formed on its surface (reflection member)

Claims (2)

[Claims] 1. A mirror-like reflecting member for reflecting white light,
A display device, wherein transparent optical interference forming members that cause optical interference in a gap formed between the reflecting member and the reflecting member are arranged so as to face each other. 2. The reflecting member and the light interference forming member,
A display device, wherein the display devices are attached to each other via a piezoelectric element that changes a gap between the two members according to an applied voltage.