KR100768193B1 - Light switch and display apparatus applying the same - Google Patents

Abstract

An optical switch and a display device employing the same are disclosed. The present invention includes a plurality of barriers for providing a passage through which light is irradiated, and a light shielding film disposed in a discharge cell partitioned by the barriers, the light shielding film adjusting a transmission amount of light by lifting and lowering according to an applied voltage. By the power applied to both ends of the means, the light shielding film is bent downward, and light passes through the bent light shielding film, thereby exciting the light emitting means such as the phosphor layer, thereby controlling the optical switch at low power. .

Description

Light switch and display apparatus applying the same

1 is a block diagram showing a display device according to a first embodiment of the present invention;

2 is a configuration diagram illustrating the line switch of FIG. 1;

3A and 3B are diagrams illustrating the operation of the line switch of FIG. 1;

4 is a configuration diagram illustrating an arrangement of pixel switches of the display device of FIG. 1;

5A and 5B are configuration diagrams showing the principle of a pixel switch of the display device of the present invention;

6 is a configuration diagram illustrating a change in light intensity according to an operation of a pixel switch of a display device of the present invention;

7A and 7B are diagrams illustrating the operation of the optical switch according to the first embodiment of the present invention;

8A and 8B are configuration diagrams illustrating the operation of the optical switch according to the second embodiment of the present invention;

9 is a block diagram showing a display device according to a second embodiment of the present invention.

<Brief description of symbols for the main parts of the drawings>

710 Barrier 720 Space

730 ... light shielding membrane 740 ... phosphor layer

830 ... light shield 831 ... through-through

840 phosphor layer 850 permanent magnet

860 Liquid Crystal Magnet

The present invention relates to an optical switch, and more particularly, to an optical switch having a characteristic of bending by light, and a display device to which the same is applied.

In general, display devices are classified into light emitting and light receiving types. The light emitting type includes a flat cathode ray tube, a plasma display panel, an electro luminescent display (EL device), a fluorescent fluorescent display, a light emitting diode (light emitting) diode). The light receiving type is a liquid crystal display.

The light emission type intercepts light emission on a pixel basis, and the passive type uses light switches to intercept light supplied from a separate light source. By the way, the display device using the conventional optical switch has a very low visible light transmittance, and thus the luminous efficiency is very low. In addition, it has a disadvantage that it is difficult to supersize, and the power consumption is large.

An object of the present invention is to provide an optical switch in which light intensity is determined using a light shielding film having a characteristic of bending by an applied voltage, and a display device employing the same.

In order to achieve the above object, an optical switch according to an aspect of the present invention,

A plurality of barriers providing passages through which light is irradiated; And

And a light shielding film disposed in the discharge cell partitioned by the barrier, and configured to adjust the amount of light transmitted by lifting and lowering according to the applied voltage.

In addition, the lower portion of the barrier is thinner than the upper, so that a predetermined space portion is formed so that light is irradiated from the sidewall of the barrier to the upper portion of the light shielding film.

In addition, the light shielding film is characterized in that it is disposed on the upper side of the barrier to selectively shield the path of light.

Further, the light shielding film is made of a piezoelectric material so as to be bent toward the lower side of the barrier by a voltage applied to both ends so that light can be selectively irradiated to the upper surface thereof.

In addition, the surface of the light shielding film is characterized in that the phosphor layer excited by the irradiated light is coated.

Optical switch according to another aspect of the present invention,

A light shielding film disposed in the discharge cell, the light shielding film having a permanent magnet disposed on an outer bottom surface thereof so as to adjust the transmission amount of light introduced into the inner space by lifting and lowering by magnetic; And

And a liquid crystal magnet disposed below the permanent magnet and selectively contacting the permanent magnet according to an applied voltage.

In addition, the light shielding film is bent downward by contacting the liquid crystal magnet by the permanent magnet, the side is characterized in that the through-hole is formed so that the light is introduced into the inner space by the downward movement of the light shielding film.

In addition, the permanent magnet is characterized in that the rubber magnet.

In addition, the liquid crystal magnet is characterized in that a magnetic component is coated on a plurality of liquid crystals to have a constant magnetism by the voltage applied to both ends.

Furthermore, a phosphor layer excited by the irradiated light is coated on the inner bottom surface of the light shielding film.

Display device according to another aspect of the present invention,

A plurality of light lines arranged side by side in the screen area on the plane; And

And an optical switch of any one of claims 1 to 12, which is disposed corresponding to the pixels of the optical lines and adjusts an amount of light transmitted to form an image.

Furthermore, the plurality of light lines further includes at least one light source for supplying light, and an optical switch for supplying light generated from the light source to each light line.

In addition, the light source is an ultraviolet LED, and further includes a fluorescent material in the path of light passing through the pixel to convert the ultraviolet light into visible light.

In addition, the light line is characterized in that it is a self-luminous source.

Further, the light source is an ultraviolet LED, and further includes a fluorescent material in the path of light passing through the pixel to convert the ultraviolet light into visible light.

Hereinafter, with reference to the accompanying drawings will be described in detail an optical switch according to a preferred embodiment of the present invention, and a display device to which it is applied.

1 illustrates a display apparatus 100 according to an embodiment of the present invention.

Referring to the drawings, the display apparatus 100 emits ultraviolet rays (UV) on the substrate 101, and includes a plurality of light lines Y1 and Y2 to Yn disposed parallel to each other, and the light lines Y1 and Y1. A plurality of pixel switch arrays arranged side by side in a direction orthogonal to Y2 to Yn, and having a plurality of unit pixel switches S1 and S2 to Sn corresponding to each light line Y1 and Y2 to Yn arranged in a line ( Z1, Z2 to Zm).

Each said light line Y1, Y2-Yn is connected to the ultraviolet light source 102, and each optical line Y1, Y2-Yn is provided with optical line switches X1, X2-Xn. The unit pixel is defined by the intersection of the light lines Y1 and Y2 to Yn where the pixel switches S1 and S2 to Sn and the pixel switch arrays Z1 and Z2 to Zm are interposed. There is a fluorescent material that generates visible light. The fluorescent material is preferably positioned next to the pixel switch on the light path such that the fluorescent material emits light by ultraviolet rays passing through the pixel switch.

The operation of the display apparatus 100 is as follows.

The ultraviolet rays generated by the light source 102 travel in the direction of each light line Y1, Y2 to Yn, and at this time, travel from one light line selected by the line switches X1, X2 to Xn.

The ultraviolet rays traveling through the light lines Y1, Y2 to Yn are emitted in a direction perpendicular to the plane of the substrate 101 by one selected pixel switch S1, S2 to Sn, and then stimulate the fluorescent material. Expresses visible light.

2 shows that the line switch of FIG. 1 is operated by a mechanical mirror device.

Referring to the drawings, ultraviolet rays from the ultraviolet light source 102 travel through a straight path 201, and the above-described line switches X1, X2 to Xn are disposed, and any selected line switch is selected. By the drive mirror m of, it advances to the said optical line Y1, Y2-Yn.

The switches X1, X2 to Xn can be manufactured in an electrostatic drive type as shown in Figs. 3A and 3B. That is, the mirror m of the switch rotatably disposed by the hinge m1 is in a position to normally close the light line, and in the direction of opening the light line when an electrostatic force is applied by the rear electrode 301. It rotates and reflects the light from the light source 201 to a corresponding light line.

4 illustrates an example of a pixel switch according to an exemplary embodiment of the present invention.

Referring to the drawings, the pixel switches S1, S2, S3, ..., Sn disposed at predetermined intervals on the optical lines Y1, Y2 to Yn are connected to piezoelectric elements, for example, voltages, to control the progress of light. It can be implemented by a piezoelectric shutter that shrinks and expands.

5A and 5B show a shutter driven by a piezoelectric element that contracts and expands with or without voltage. Referring to the drawings, the expansion and contraction of the piezoelectric element is used as a shutter to block or pass light at the switch.

6 illustrates a piezoelectric shutter showing a difference in opening and closing amount according to a voltage difference, and a difference in intensity of light passing through the piezoelectric shutter.

Referring to the figure, the first shutter to which the lowest voltage V1 is applied has a small amount of expansion, thus allowing most of the light to pass through and having the strongest light intensity. And, the second shutter, to which the intermediate voltage V2 is applied, blocks a considerable part of the expanding light path, thus passing only a part of the light and keeping the light intensity medium. The third shutter, to which the highest voltage V3 is applied, expands sufficiently to completely block the passage of light.

By the piezoelectric material, the shutter may be implemented by the display device. As is well known, the above operation can be obtained by using a liquid crystal shutter which controls the passage amount of light in accordance with the arrangement of the liquid crystals.

FIG. 7A illustrates a state in which a switch for controlling light according to the first embodiment of the present invention blocks light, and FIG. 7B illustrates a state in which the light control switch in FIG. 7A passes light.

7A and 7B, each discharge cell is partitioned by a barrier 710. The barrier 710 has a strip shape, and provides a path through which light travels between the pair of barriers 710. The barrier 710 has a lower thickness than the upper thickness, and forms a cross-sectional area of a “T” shape. Accordingly, a predetermined space portion 720 is formed in the lower portion of the barrier 710 in the width direction, and a passage of the ultraviolet light emitted from the light source is formed.

The light shielding film 730 is provided on the upper ends of the pair of barriers 710. The light shielding film 730 may selectively shield ultraviolet rays in the barrier 710. The light shielding film 730 is a material that is bent using a piezoelectric effect, for example, a movable ribbon.

The light shielding film 730 is made of a piezoelectric material that does not pass ultraviolet rays, and when using a light source for generating visible light, may be made of a piezoelectric material that does not pass visible light. That is, the material of the light shielding film 730 may be appropriately selected according to the light source, and in the case of using an ultraviolet LED as the light source, a material such as glass may be used. A red, green, and blue phosphor layer 740 is formed on the top surface of the light shielding film 730.

In the optical switch having the above configuration, when a predetermined DC voltage, for example, 5 V, is applied to both ends of the shielding film 730, the shielding film 730 is bent downward due to a piezoelectric effect. Accordingly, the ultraviolet rays in the space 720 below the barrier 710 are transferred to the upper portion of the shielding layer 730.

For this reason, the phosphor layer 740 formed on the upper surface of the shielding film 730 is excited to form an image. At this time, since the shielding film 730 is bent downward and does not shield the passage of ultraviolet rays, the transmittance of ultraviolet rays is maximized.

On the other hand, when the light is not emitted from the pixel, when the voltage applied to both ends of the shielding film 730 is removed, the shielding film 730 moves to the upper part of the barrier 710 again, thereby completely preventing ultraviolet rays. Will be blocked.

As a result, the transmittance of ultraviolet rays is minimized. By appropriately controlling the voltage applied in this manner, the light transmittance can be adjusted, and the gray scale can be expressed by adjusting the light transmittance. On the other hand, when the light source emits visible light, it may be replaced by a color filter instead of the phosphor layer 740.

Although not shown in the drawings, a light source, such as an ultraviolet LED or a white LED, may be provided at one end of the light lines Y1, Y2, Y3, ..., Yn. According to this structure, the light source of each line is operated by a separate drive circuit. Thus, the mechanical line switch described above is not necessary.

8A illustrates a state in which a switch for controlling light according to the second embodiment of the present invention blocks light, and FIG. 8B illustrates a state in which the switch for controlling light of FIG. 8A passes light.

8A and 8B, a light shielding film 810 is provided in the optical switch. The light shielding film 810 is made of a material having elasticity. In the light shielding film 810, a through hole 831 is formed along a side surface of the light shielding film 810 so that ultraviolet light may flow through the internal space. The through hole 831 provides a path through which light travels.

Red, green, and blue phosphor layers 840 are formed on the inner bottom surface of the light shielding film 810. In addition, a permanent magnet 850 such as a rubber magnet is attached to the outer bottom surface of the light shielding film 810.

In this case, the liquid crystal magnet 860 is disposed under the light shielding film 810 spaced apart from the permanent magnet 850. The liquid crystal magnet 860 is a magnet in which magnetic components are coated on both ends of the liquid crystal, and when a predetermined voltage is applied, the liquid crystal is arranged in a predetermined direction.

In the optical switch having the above configuration, when a predetermined DC voltage, for example, 5V, is applied to both ends of the liquid crystal magnet 860, the liquid crystal included in the liquid crystal magnet 860 is arranged in a predetermined direction by magnetism. do.

Accordingly, the permanent magnet 850 located on the upper portion of the liquid crystal magnet 860 interacts with the liquid crystal magnet 860 and is bent under the elastic light shielding film 830. Accordingly, ultraviolet rays are introduced through the through holes 831 formed in the light shielding film 830 and irradiated into the internal space.

As a result, the phosphor layer 840 deposited on the upper surface of the light shielding film 830 is excited to form an image. At this time, the light shielding film 830 is bent downward, so that the passage of the ultraviolet rays is not shielded, and thus the transmittance of the ultraviolet rays is maximized.

On the other hand, although not shown, a barrier is provided outside the light shielding film 830 to selectively pass ultraviolet rays into the through hole 831 of the light shielding film 830.

On the other hand, when the light is not emitted from the pixel, when the voltage applied to both ends of the light shielding film 830 is removed, the light shielding film 830 moves to the upper part of the barrier 830 again, thereby preventing ultraviolet rays. Completely blocked.

As a result, the transmittance of ultraviolet rays is minimized. In this way, by controlling the voltage to be applied, the light transmittance can be adjusted, and the gray scale can be expressed by adjusting the light transmittance. On the other hand, when the light source emits visible light, it may be replaced by a color filter instead of the phosphor layer 840.

9 schematically illustrates a display apparatus 200 according to a second embodiment of the present invention.

Referring to the drawings, the display apparatus 200 uses light lines Y1 and Y2 to Yn as light sources. For example, the linear cold cathode fluorescent lamp CCFL or the external electrode fluorescent lamp EFFL may be used as the light source K1. , K2, K3 to Kn).

Accordingly, in the display apparatus 200, a plurality of cold cathode tubes K1, K2, and K3 to Kn are arranged in parallel with each other. The display apparatus 200 may be driven for each line by switching each cold cathode tube. In addition, the light control switch applied here can apply what was demonstrated by 1st Embodiment as it is. In this case, the light passing through the light control switch is converted by the color filter to implement an image.

On the other hand, the display devices described above can be applied to bent display devices such as electronic paper by using a substrate such as plastic having flexibility.

As described above, the optical switch of the present invention and the display device to which the present invention is applied can obtain the following effects.

By the power applied to both ends of the light shielding means, the light shielding film is bent downward, and light passes through the curved light shielding film to excite the light emitting means such as the phosphor layer, thereby controlling the optical switch at low power. Done.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (19)

A plurality of barriers providing passages through which light is irradiated; A light shielding film disposed in a cell partitioned by the barrier, the light shielding film disposed on an upper side of the barrier to selectively shield a path of light, and configured to move in accordance with an applied voltage to adjust the amount of light transmitted therethrough; The lower portion of the barrier is thinner than the upper portion so that a predetermined space portion is formed so that light is radiated from the sidewall of the barrier to the upper portion of the light shielding film. And the light shielding film is made of a piezoelectric material such that the light shielding film is bent in a lower direction of the arrangement by a voltage applied to both ends so that light can be selectively irradiated to the upper surface thereof. delete delete delete The method of claim 1, The surface of the light shielding film is coated with a phosphor layer which is excited by the light to be irradiated. The method of claim 1, The light is an optical switch, characterized in that any one selected from ultraviolet light or visible light. A light shielding film disposed in the discharge cell, the light shielding film having a permanent magnet disposed on an outer bottom surface thereof so as to adjust the transmission amount of light introduced into the inner space by lifting and lowering by magnetic; And And a liquid crystal magnet disposed in a lower portion corresponding to the permanent magnet and selectively contacting the permanent magnet according to an applied voltage. The method of claim 7, wherein The light shielding film is an optical switch characterized in that the through-hole is formed so that the liquid crystal magnet is in contact with the permanent magnet by the permanent magnet, the through hole is formed so that the light can be introduced into the inner space by the downward motion of the light shielding film. The method of claim 7, wherein And the permanent magnet is a rubber magnet. The method of claim 7, wherein The liquid crystal magnet is a light switch, characterized in that the magnetic component is coated on a plurality of liquid crystal so as to have a constant magnetism by the voltage applied to both ends. The method of claim 7, wherein And a phosphor layer which is excited by the irradiated light is coated on the inner bottom surface of the light shielding film. The method of claim 7, wherein The light is an optical switch, characterized in that any one selected from ultraviolet light or visible light. A plurality of light lines arranged side by side in the screen area on the plane; And And a light switch according to any one of claims 1 and 5 to 12, which is disposed corresponding to the pixels of the light lines and adjusts a transmission amount of light irradiated to form an image. The method of claim 13, The plurality of light lines further comprises at least one light source for supplying light and an optical switch for supplying light generated from the light source to each light line. The method of claim 14, The light source is an ultraviolet LED, and further comprising a fluorescent material in the path of light passing through the pixel to convert the ultraviolet light into visible light. The method of claim 14, The light source may be any one selected from a cold cathode fluorescent lamp, an external electrode fluorescent lamp, and a white LED. The method of claim 13, And the light line is a self-luminous source. delete delete

Images