KR100600354B1 - Versatile display apparatus - Google Patents

Abstract

The multifunction display apparatus includes a first electrode layer formed on a transparent substrate; An electrochromic layer formed on the first electrode layer; A second electrode layer comprising a plurality of first conductive line groups arranged in a first direction on the electrochromic layer; A light emitting element layer attached to the second electrode layer to emit light; And a third electrode layer formed on the light emitting element layer, the third electrode layer including a plurality of second conductive line groups arranged in a second direction perpendicular to the first conductive line group.

Therefore, the window function and the display function can be simultaneously implemented.

Display, Electrochromic, Light Emitting Device, TCO

Description

Versatile display apparatus             

1 is a view showing an example of a conventional general electrochromic device.

2 is a view showing an example of a display element using a conventional general phosphor.

3 is a schematic view of a multi-function display device according to an embodiment of the present invention.

4 is a view illustrating a light emitting diode arrayed in the multifunction display device of FIG. 3;

5 is a schematic view of a multifunction display device according to another preferred embodiment of the present invention.

FIG. 6 is a view illustrating a state in which heat generated in a light emitting device layer is emitted in the multifunction display device of FIG. 5. FIG.

<Explanation of symbols for the main parts of the drawings>

21: transparent substrate 22, 24, 26: electrode layer

23 electrochromic layer 25 light emitting element layer

27: heat dissipation layer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a multifunctional display device having a window function and a display function.

In general, an electrochromic device (ECD) is an element that uses electrochromism for display or storage, and is used for smart windows, display elements, micro-battery, and the like. do.

Here, electrochromism refers to a phenomenon in which reversible electrolytic oxidation or reduction occurs when a voltage is applied, and reversibly coloring / bleaching.

That is, when the electrochromic device applies a voltage to the electrochromic material, which is a light transmitting body, the electrochromic device displays or transmits a new color by increasing the amount of light absorbed by a redox reaction or an electron transition in which electrons are lost or gain electrons. A device that creates a non-transparent window.

1 is a view showing an example of a conventional general electrochromic device.

As shown in FIG. 1, a conventional electrochromic device has an electrochromic structure between a lower transparent substrate 1 having a lower conductive layer 2 attached thereto and an upper transparent substrate 3 having an upper conductive layer 4 attached thereto. It has a structure for forming the muck layer (5). Here, the upper and lower conductive layers are made of indium-tin-oxide (ITO) material having a transparent conductive material. The electrochromic layer 5 may be colored / decolored by voltage, and may be made of a material having transmission or impermeability. In this case, when the electrochromic layer 5 is made of a material having a specific color, a specific color (for example, green) may be realized by voltage. The lower conductive layer 2 and the upper conductive layer 4 may be formed on the front surface of the lower transparent substrate 1 and the upper transparent substrate 3, respectively.

Accordingly, the electrochromic layer 5 has a transmissive characteristic due to the voltage applied to the upper and lower conductive layers 2 and 4, so that the visible light incident on the lower transparent substrate 1 remains as it is. It can pass through and release to the outside.

If a voltage opposite to the voltage previously applied is applied, the electrochromic layer 5 becomes opaque, and visible light incident on the lower transparent substrate 1 passes through the upper transparent substrate 3 to the outside. Can not be released.

The electrochromic device using this characteristic may be applied to a window of a vehicle, a window of a building, or the like, so that the outside may be invisible or visible if necessary.

In addition, as described above, the electrochromic device may be used as a display device displaying a specific color.

However, the conventional electrochromic device has a long time required for coloring / discoloring, and thus does not meet the display characteristic of displaying color immediately, and thus has not received much attention as a display device.

On the other hand, there is a structure as shown in Fig. 2 as a display element. Such display elements may be used as display devices of automobiles, for example, to display numbers, letters, or images.

2 is a view showing an example of a display element using a conventional general phosphor.

As shown in FIG. 2, a display device using a conventional phosphor has a plurality of first electrode groups 7 arranged in a first direction on a transparent substrate 6 and the first electrode groups 7 arranged therein. A phosphor layer 8 formed on the transparent substrate 6, a black dielectric layer 9 formed on the phosphor layer 8 to enhance the contrast of the phosphor layer 8, and the black dielectric layer 9. And a plurality of second electrode groups 10 formed on and arranged in a second direction perpendicular to the first electrode group 7.

Here, the first electrode group 7 is made of ITO having a transparent conductive material so that the color generated in the phosphor layer 8 can be transmitted and exposed to the outside through the transparent substrate 6. In contrast, the second electrode group 10 may not transmit the color generated in the phosphor layer 8 by the black dielectric layer 9, and the generated color may be emitted only toward the transparent substrate 6. Therefore, any conductive material that is transparent or unknown may be used.

The phosphor layer 8 is made of a fluorescent material that converts electricity into light, and a color set by a predetermined voltage is generated. For example, when the phosphor layer 8 is made of a fluorescent material having red (R) color, red (R) color may be generated when a voltage is applied to the phosphor layer 8. Thus, by forming the phosphor layer 8 with a fluorescent material to realize a specific color, a specific color can be produced.

On the other hand, if it is desired to implement a variety of colors, the phosphor layer 8 may be formed of a fluorescent material having a corresponding color. For example, when a plurality of pixels arranged in a matrix form fluorescent materials having red (R) color, green (G) color, and blue (B) color, respectively, are formed on the phosphor layer 8 vertically. Various colors are generated by the pixels having respective color fluorescent materials by the voltage applied between the plurality of arranged first electrode groups 7 and the plurality of second electrode groups 10. The predetermined image can be displayed by.

As described above, the electrochromic device may control transmission / non-transmission, and the display device using the phosphor may implement a predetermined image.

However, a display device having a transmission / non-transmission function, that is, a display function as well as a window function has not been proposed.

An object of the present invention is to provide a multi-function display device having a window function and a display function at the same time.

According to a preferred embodiment of the present invention for achieving the above object, the multi-function display device, the first electrode layer formed on a transparent substrate; An electrochromic layer formed on the first electrode layer; A second electrode layer comprising a plurality of first conductive line groups arranged in a first direction on the electrochromic layer; A light emitting element layer attached to the second electrode layer to emit light; And a third electrode layer formed on the light emitting element layer, the third electrode layer including a plurality of second conductive line groups arranged in a second direction perpendicular to the first conductive line group.

According to another preferred embodiment of the present invention, the multi-function display device, the first electrode layer formed on a transparent substrate; An electrochromic layer formed on the first electrode layer; A second electrode layer comprising a plurality of first conductive line groups arranged in a first direction on the electrochromic layer; A light emitting element layer attached to the second electrode layer to emit light; A third electrode layer formed on the light emitting element layer and including a plurality of second conductive line groups arranged in a second direction perpendicular to the first conductive line group; And a heat dissipation layer for dissipating heat generated in the light emitting device layer.

Hereinafter, a preferred embodiment of the present invention with reference to the accompanying drawings.

3 is a diagram schematically illustrating a multifunction display apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 3, a multifunctional display device according to an embodiment of the present invention includes a transparent substrate 21 having a transparent material, a first electrode layer 22 formed on the front surface of the transparent substrate 21, and the first substrate. A second electrode layer 24 including an electrochromic layer 23 formed on the electrode layer 22, a plurality of first conductive line groups arranged in a first direction on the electrochromic layer 23, and And a light emitting device layer 25 attached to the second electrode layer 24 to emit light, and a plurality of light emitting device layers 25 formed on the light emitting device layer 25 and arranged in a second direction perpendicular to the first conductive line group. A third electrode layer 26 made of the second conductive line group is provided.

The transparent substrate 21 has a transparent material having excellent light transmittance.

The first electrode layer 22 is made of a transparent conductive oxide (TCO) material having excellent light transmittance and is integrally formed on the entire surface of the transparent substrate 21.

The electrochromic layer 23 is made of a material capable of transmitting or non-transmitting light by being colored / discolored by an externally applied voltage.

The second electrode layer 24 may include a plurality of first conductive line groups arranged in a first direction (eg, a horizontal direction), and may be made of a TCO material. The second electrode layer 24 may be used as a common electrode for controlling the electrochromic layer 23 and the light emitting device layer 25. That is, to control the electrochromic layer 23, a predetermined voltage may be applied between the first electrode layer 22 and the second electrode layer 24. In addition, another voltage may be applied between the second electrode layer 24 and the third electrode layer 26 to control the light emitting device layer 25. As such, by using the second electrode layer 24 as a common electrode, the number of electrode layers can be reduced, thereby achieving a cost reduction effect.

The light emitting device layer preferably includes a plurality of pixel regions arranged in a matrix.

A black matrix made of a metal material or an oxidized material having low light transmittance may be provided between the pixel areas to separate the pixel areas. Such a black matrix can prevent the color generated in the pixel area from leaking into the peripheral pixel area.

Preferably, the black matrix preferably has a function of preventing electro-static discharge (ESD). That is, in general, electrostatic discharge is likely to occur in a display element having a small pixel area. Therefore, by adding a function capable of preventing such an electrostatic discharge to the black matrix, it is possible to prevent breakage due to electrostatic discharge and a decrease in operating characteristics.

Each pixel area may be provided with a light emitting diode as shown in FIG. 4.

The pixel region may be defined by the intersection of the first electrode line group and the second electrode line group.

The light emitting diode 32 is provided between the electrode line 30 included in the second electrode layer 24 and the electrode line 31 included in the third electrode layer 26. In this case, it is preferable that the P layer of the light emitting diode 32 is connected to the electrode line 30, and the N layer is connected to the electrode line 31. Therefore, in order to emit light of the light emitting diode 32, a positive voltage should be applied to the electrode line 30 and a negative line should be applied to the electrode line 31. Such a light emitting diode typically consists of a P layer, an N layer, an active layer, and the like. At this time, the electron and the electron are coupled by the voltage applied between the P layer and the N layer to emit light.

The light emitting diode may have a chip shape and may be connected to the electrode lines 30 and 31 by wire bonding.

Alternatively, the light emitting diode may be grown on the second electrode layer 24 or the third electrode layer 26 by a semiconductor process. At this time, it is preferable to grow on the transparent nitride or oxide substrate.

The light emitting device layer is preferably made of a combination of a red light emitting diode, a green light emitting diode, and a blue light emitting diode. Only then, by controlling the light emission of each light emitting diode, full color implementation can be achieved.

The third electrode layer 26 may include a plurality of second conductive line groups arranged in a second direction (for example, a vertical direction) perpendicular to the first conductive line group, and any conductive material may be used. That is, since light is not emitted to the third electrode layer 26, it is not necessary to use a TCO material. In other words, the third electrode layer 26 may be any material of TCO material or non-transparent material. However, it is preferable that the third electrode layer 26 is made of a conductive material through which a current flows well when voltage is applied.

In the multifunctional display device of the present invention configured as described above, the electrochromic layer 23 is controlled by the voltage applied to the first electrode layer 22 and the second electrode layer 24 to have transmission / non-transmission characteristics.

Thus, this transmissive / non-transmissive property allows for window functionality.

In this case, the same voltage must be applied to all of the plurality of first conductive line groups included in the second electrode layer 24. If there is a conductive line group to which no voltage is applied among the plurality of conductive line groups, the electrochromic layer 23 positioned in the region corresponding to the conductive line group does not apply a predetermined voltage to provide transmission / non-transmissive characteristics. It may not work properly.

In addition, the plurality of light emitting diodes included in the light emitting device layer 25 may be controlled by voltages applied to the second electrode layer 24 and the third electrode layer 26 to display desired numbers, letters, or images.

For example, blue may be emitted by a voltage applied between the electrode line included in the second electrode layer 24 connected to the blue light emitting diode and the electrode line included in the third electrode layer 26.

The color light emitted as described above is recognized by the human eye through the second electrode layer 24, the electrochromic layer 23, the first electrode layer 22, and the transparent substrate 21. At this time, the electrochromic layer 23 is adjusted to have a transmission characteristic by a predetermined voltage.

FIG. 5 is a view schematically illustrating a multifunction display device according to another exemplary embodiment of the present invention, which is useful when a dozen or more light emitting diodes are provided to generate considerable heat, thereby deteriorating operating characteristics.

Referring to FIG. 5, a multifunctional display device according to another embodiment of the present invention includes a transparent substrate 21 having a transparent material, a first electrode layer 22 formed on the front surface of the transparent substrate 21, and the first substrate. An electrochromic layer 23 formed on the electrode layer 22, a second electrode layer 24 formed of a plurality of first conductive line groups arranged in a first direction on the electrochromic layer 23, and A light emitting element layer 25 attached to the second electrode layer 24 to emit light, and a plurality of second formed on the light emitting element layer 25 and arranged in a second direction perpendicular to the first conductive line group A third electrode layer 26 made of a conductive line group and a heat dissipation layer 27 for dissipating heat generated by the light emitting element layer 25 are provided.

5 is similar to FIG. 3, but further includes a heat dissipation layer 27 for quickly dissipating heat generated in the light emitting element layer 25 to the outside.

Hereinafter, the description of the same parts as in FIG. 3 will be omitted since it has been described in detail above.

The heat dissipation layer 27 is provided to more quickly discharge heat generated from the light emitting device layer 25 to the outside, and may be made of a TCO material having high thermal conductivity. At this time, in order to release heat faster, it is advantageous to have a large cross-sectional area of the heat dissipation layer 27, so that the heat dissipation layer 27 is preferably formed as thick as possible. In addition, the heat dissipation layer 27 preferably has a thermal conductivity at least two times higher than that of the first and second electrode layers 22 and 24.

Thus, by providing a thick heat radiation layer 27 having a high thermal conductivity on the third electrode layer 26, rather than the heat generated in the light emitting element layer 25 proceeds to the electrochromic layer 23 The heat dissipation layer 27 may be advanced to the outside via the third electrode layer 26.

As shown in FIG. 6, heat generated in the light emitting element layer 25 is mainly emitted to the outside through the heat dissipation layer 27.

In the multifunctional display device of the present invention configured as described above, the electrochromic layer 23 is controlled by the voltage applied to the first electrode layer 22 and the second electrode layer 24 to have transmission / non-transmission characteristics.

In this case, the same voltage must be applied to all of the plurality of first conductive line groups included in the second electrode layer 24. If there is a conductive line group to which no voltage is applied among the plurality of conductive line groups, the electrochromic layer 23 positioned in the region corresponding to the conductive line group does not apply a predetermined voltage to provide transmission / non-transmissive characteristics. It may not work properly.

In addition, the plurality of light emitting diodes included in the light emitting device layer 25 may be controlled by voltages applied to the second electrode layer 24 and the third electrode layer 26 to display desired numbers, letters, or images.

The color light emitted as described above is recognized by the human eye through the second electrode layer 24, the electrochromic layer 23, the first electrode layer 22, and the transparent substrate 21. At this time, the electrochromic layer 23 is adjusted to have a transmission characteristic by a predetermined voltage.

As described above, according to the present invention, a window function and a display function may be simultaneously implemented. For example, if the multi-function display device is applied to the glass window, it is possible to normally adjust the transmission / non-transmission state so that it can be seen from the outside or invisible, and if necessary, a vivid image implemented in various colors can be seen through the display function.

Therefore, such a multifunctional display device is expected to be actively applied to various applications such as automobiles, airplanes, glasses, building windows, etc. in the future.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (16)

A first electrode layer formed on the transparent substrate; An electrochromic layer formed on the first electrode layer; A second electrode layer comprising a plurality of first conductive line groups arranged in a first direction on the electrochromic layer; A light emitting element layer attached to the second electrode layer to emit light; And A third electrode layer formed on the light emitting element layer and comprising a plurality of second conductive line groups arranged in a second direction perpendicular to the first conductive line group Multifunction display device comprising a. The heat dissipation layer of claim 1, wherein the heat dissipation layer dissipates heat generated in the light emitting element layer. Multifunction display device further comprising. The multifunction display apparatus of claim 1 or 2, wherein the first electrode layer is formed on a front surface of the transparent substrate. The multifunction display apparatus of claim 1 or 2, wherein the first and second electrode layers and the heat dissipation layer are made of a TCO material. The multifunction display apparatus according to claim 1 or 2, wherein the pixel region is defined by an intersection point of the first electrode line group and the second conductive line group. The multifunction display apparatus of claim 1 or 2, wherein the light emitting device layer includes a light emitting diode for each pixel area. The multifunction display apparatus of claim 6, wherein the light emitting diode emits light by combining electrons and electrons. The multifunction display apparatus of claim 6, wherein the light emitting diode is formed in a chip shape and connected to the conductive line group by wire bonding. The multifunction display apparatus of claim 6, wherein the light emitting diode is grown by a semiconductor process on one of the second electrode layer and the third electrode layer. The multifunction display apparatus of claim 1 or 2, wherein the light emitting device layer is provided with a black matrix between pixel areas. The multifunction display apparatus of claim 10, wherein the black matrix is made of one of a metallic material and an oxidizing material. The multifunction display apparatus of claim 10, wherein the black matrix has an antistatic discharge function. The multifunction display apparatus of claim 1 or 2, wherein the light emitting element layer is formed of a combination of a red light emitting diode, a green light emitting diode, and a blue light emitting diode. The multifunction display apparatus of claim 1 or 2, wherein the second electrode layer is used as a common electrode for controlling the electrochromic layer and the light emitting element layer. The multifunction display apparatus of claim 2, wherein the heat dissipation layer has at least twice as high thermal conductivity as the first and second electrode layers. The multifunction display apparatus of claim 2, wherein the heat dissipation layer is formed on a third electrode layer .

Images