KR102081125B1 - Electronic Device - Google Patents

Abstract

The present invention provides a light emitting device comprising: a light emitting panel including sub pixels emitting light to display an image; And a discoloration panel positioned on one surface of the light emitting panel and discolored by a voltage supplied from the outside, wherein the discoloring panel includes a lower substrate, an upper substrate bonded to the lower substrate, a lower electrode formed on one surface of the lower substrate, An electrochromic layer formed on the lower electrode, and an upper electrode formed on one surface of the upper substrate facing the lower substrate, and at least one of the lower electrode and the upper electrode includes a divided electrode divided to be spaced apart from each other by a predetermined distance Provide the appliance.

Description

Electronic device

The present invention relates to an electronic device.

With the development of information technology, the market for a display device, which is a connection medium between a user and information, is growing. Currently, display devices such as liquid crystal displays and organic light emitting display devices are implemented in small, medium and large sizes.

Unlike the liquid crystal display, the organic light emitting display device has various advantages, such as not only thinning the display panel but also providing ductility and maintaining both sides of the transparent state or displaying a specific image through both sides.

Accordingly, in recent years, there has been an increasing number of applications in various electronic devices such as display devices, smart windows, rearview mirrors, etc. by combining an organic light emitting display device (hereinafter abbreviated as OLED panel) and an electrochromic device.

The electrochromic device includes an electrochromic layer between upper and lower electrodes formed on upper and lower substrates. The electrochromic layer causes a reversible redox reaction and converts colors. The electrochromic layer displays color (colors) or non-colors (colors) by voltages applied to the upper and lower electrodes.

When the electrochromic element is grafted to a transparent OLED panel, the electrochromic element is paneled and attached to the OLED panel, and the attached electrochromic panel is improved to improve the contrast ratio (ACR) of the OLED panel in an outdoor environment. It is used as a shading plate for.

However, conventionally proposed electronic devices are required to improve the reaction rate of displaying (coloring) or non-displaying (discoloring) color and having low light transmittance (or transparency).

The present invention for solving the above problems of the background art is to provide an electronic device that can increase the transmittance, lower the driving voltage, and reduce the process and manufacturing cost.

The present invention provides a light emitting panel including sub-pixels for emitting light to display an image; And a discoloration panel positioned on one surface of the light emitting panel and discolored by a voltage supplied from the outside, wherein the discoloring panel includes a lower substrate, an upper substrate bonded to the lower substrate, a lower electrode formed on one surface of the lower substrate, An electrochromic layer formed on the lower electrode, and an upper electrode formed on one surface of the upper substrate facing the lower substrate, and at least one of the lower electrode and the upper electrode includes a divided electrode divided to be spaced apart from each other by a predetermined distance Provide the appliance.

At least one of the lower electrode and the upper electrode may include a split electrode and a common electrode formed in a plate shape to cover the split electrode.

The division electrode may be made of a low resistance metal material, and the common electrode may be made of a transparent oxide material.

The subpixels may include a transmission area through which external light is transmitted, a light emitting area in which light emitting devices emitting light are formed, and a circuit area in which a driving device driving light emitting devices is formed.

The division electrode may be located in a region corresponding to the light emitting region and the circuit region.

The lower electrode and the upper electrode may be formed in a split electrode form.

The lower electrode may include a split electrode and a common electrode formed in a plate shape to cover the split electrode.

The color change panel may have a color change layer formed on a surface adjacent to the lower substrate.

The electrochromic layer may include a viologen-based material.

The present invention has the effect of providing an electronic device that can increase the transmittance, lower the driving voltage, and reduce the process and manufacturing cost by using a low resistance split electrode.

1 is a schematic cross-sectional view of an electronic device according to a first embodiment of the present invention.
FIG. 2 is a view for explaining a display state of a display panel for each driving state of the electronic device illustrated in FIG. 1.
3 is an exemplary circuit configuration of a subpixel of a light emitting panel.
4 is a diagram for describing a planar structure of a subpixel of a light emitting panel.
5 is a view for explaining the cross-sectional structure of the sub-pixel of the light emitting panel.
6 is a view for explaining the cross-sectional structure of the color change panel according to the first embodiment of the present invention.
7 is a view for explaining the driving characteristics of the color change panel shown in FIG.
8 is a view showing the shape of the upper electrode of the color change panel.
9 is a view for explaining the cross-sectional structure of the color change panel according to the second embodiment of the present invention.
10 is a view for explaining the driving characteristics of the color change panel shown in FIG.

Hereinafter, with reference to the accompanying drawings, the specific content for the practice of the present invention will be described.

The present invention provides an electronic device that can be applied in various fields such as a display device, a smart window, a rearview mirror, and the like by integrating an organic electroluminescent display panel and an electrochromic device.

<First Embodiment>

1 is a schematic cross-sectional view of an electronic device according to a first embodiment of the present invention, FIG. 2 is a view for explaining a display state of a display panel for each driving state of the electronic device shown in FIG. 1, and FIG. It is an example of the circuit structure of the subpixel of a panel.

As shown in FIG. 1, the electronic device according to the first embodiment of the present invention includes a display panel 150 including a light emitting panel 110 and a color change panel 130.

The light emitting panel 110 emits light to display an image in response to a scan signal and a data signal supplied from the outside. The color change panel 130 displays the color (colors) or non-displays (colors) the color by a voltage supplied from the outside. The color change panel 130 is positioned on the rear side (or rear side) of the light emitting panel 110.

As shown in FIG. 2A, when the scan signal and the data signal are supplied from the outside, the display panel 150 of the electronic device according to the first embodiment of the present invention displays an image such as a video or an image.

As shown in FIG. 2B, the display panel 150 of the electronic device according to the first embodiment of the present invention displays the transmitted background when the scan signal and the data signal supplied from the outside are blocked. That is, the display panel 150 transmits a specific object or a background existing on the back or front surface as it is.

As shown in (c) of FIG. 2, the display panel 150 of the electronic device according to the first embodiment of the present invention displays a black light and the like so that a specific object or background is not transmitted when a voltage is supplied from the outside. That is, the display panel 150 does not transmit a specific object or a background existing on the back side or the front side.

The light emitting panel 110 is implemented as an OLED panel including an organic light emitting diode (OLED). The subpixel SP of the light emitting panel 110 implemented as an OLED panel is formed in a top-emission method, a bottom-emission method, or a dual-emission method according to a structure.

As shown in FIG. 3, a subpixel SP of the light emitting panel 110 includes a switching transistor SW, a driving transistor DR, a capacitor Cst, and an organic light emitting diode OLED. It may be configured as a 1C (Capacitor) structure.

The switching transistor SW switches so that the data signal supplied through the first data line DL1 is stored as a data voltage in the capacitor Cst in response to the scan signal supplied through the first scan line SL1. The driving transistor DR operates so that a driving current flows between the high potential power wiring VDD that delivers the high potential power and the low potential power wiring VSS that transfers the low potential power according to the data voltage stored in the capacitor Cst. do. The organic light emitting diode OLED operates to emit light according to the driving current formed by the driving transistor DR.

However, a compensation circuit CC may be added to the subpixels SP as shown. The compensation circuit CC compensates for the threshold voltage and the like of the driving transistor DR. For example, the compensation circuit CC is configured by a diode connection method or a source follower method to compensate for the threshold voltage of the driving transistor DR. To this end, the compensation circuit CC is composed of one or more transistors and capacitors. In addition, an initialization voltage, a reference voltage, or an auxiliary voltage is further supplied to a specific node of the compensation circuit CC. Therefore, when the compensation circuit CC is added, the subpixel SP of the light emitting panel 110 includes 3T1C, 4T2C, 5T2C, 6T2C, and the like.

4 is a diagram for describing a planar structure of a subpixel of a light emitting panel, and FIG. 5 is a diagram for explaining a cross-sectional structure of a subpixel of a light emitting panel.

As shown in FIG. 4, the light emitting panel 110 includes a plurality of sub pixels SP emitting light. The subpixel SP may be arranged in a matrix form, but is not limited thereto.

The subpixel SP includes a transmission area TA through which external light is transmitted, a light emission area AA in which a light emitting device for emitting light is formed, and a circuit area DA in which a driving device for driving the light emitting device is formed. .

As described above with reference to FIG. 3, an organic light emitting diode is positioned in the light emitting region AA, and a switching transistor, a driving transistor, and a capacitor are positioned in the circuit region DA.

As shown in FIG. 5, the subpixel SP of the light emitting panel 110 is formed between the first substrate 111 and the second substrate 119. The first substrate 111 and the second substrate 119 of the light emitting panel 110 are selected as transparent substrates. The first substrate 111 and the second substrate 119 are selected from glass, polyester sulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), and polycarbonate (PC). It may be one, but is not limited thereto.

The subpixel SP of the light emitting panel 110 includes a light emitting area AA in which the organic light emitting diode OLED is located, a circuit area DA in which a transistor TFT including a switching transistor and a driving transistor is located, and an external device. A transmission area TA through which light is transmitted is included.

The color change panel 130 includes a lower substrate 131, a lower electrode 133, an electrochromic layer 135, an upper electrode 137, and an upper substrate 139. The lower substrate 131 and the upper substrate 139 of the color change panel 130 are selected as transparent substrates. The lower substrate 131 and the upper substrate 139 may be one selected from glass, polyester sulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), and polycarbonate (PC). But it is not limited thereto.

The light emitting panel 110 and the color change panel 130 are bonded by a transparent adhesive or a transparent adhesive 140. For example, the transparent adhesive or the transparent adhesive 140 is formed between the first substrate 111 of the light emitting panel 110 and the upper substrate 139 of the color fading panel 130. However, when the light emitting panel 110 and the color changing panel 130 are configured to share the first substrate 111 of the light emitting panel 110 or the upper substrate 139 of the color changing panel 130, the transparent adhesive or the transparent adhesive 140 ) May be omitted.

The electrochromic layer 135 causes a reversible redox reaction and converts colors. The electrochromic layer 135 displays (colors) or non-displays (colors) a color such as black by the voltage supplied through the lower electrode 133 and the upper electrode 137.

The electrochromic layer 135 may use a viologen-based material. Viologen consists of a mixture of solution or gel type. Since viologen discolors in the reduction reaction, it reacts in the cathode region and is distributed around the cathode. Viologen has the property of improving the light blocking rate when the driving voltage is increased, so that the light blocking performance can be adjusted according to the voltage intensity.

The lower electrode 133 is formed on one surface of the lower substrate 131. The lower electrode 133 may be selected as a cathode electrode. The lower electrode 133 selected as the cathode electrode is made of a transparent oxide material. The lower electrode 133 may be formed of, for example, indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), indium gallium zinc oxide (IGZO), and graphene. It may be made of the same transparent conductive film.

The upper electrode 137 is formed on one surface of the lower substrate 131 or the upper substrate 139 facing the lower electrode 133. The upper electrode 137 may be selected as an anode electrode. The upper electrode 137 selected as the anode electrode is made of a low resistance metal material. The upper electrode 137 is, for example, one selected from the group consisting of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), and copper (Cu). It may be an alloy of, may be made of a single layer or multiple layers.

The upper electrode 137 selected as the anode electrode is composed of divided electrodes separated by a predetermined distance. The upper electrode 137 including the split electrodes is positioned in regions corresponding to the light emitting area AA and the circuit area DA so that the viewing angles of the upper, lower, left, and right sides of the subpixel SP are considered and the transmittance is not lowered.

To this end, the upper electrode 137 is formed to correspond to or smaller than the area where the light emitting area AA and the circuit area DA are combined. The upper electrode 137 composed of the split electrodes improves the transmittance of the color fading panel, and serves to reduce the driving voltage and reduce the power consumption by the low resistance electrode (or wiring).

6 is a view for explaining the cross-sectional structure of the color change panel according to the first embodiment of the present invention, Figure 7 is a view for explaining the driving characteristics of the color change panel shown in Figure 6, Figure 8 is a view of the color change panel A diagram showing the shape of the upper electrode.

In FIG. 5, the sub-pixel is illustrated based on one subpixel. However, as shown in FIG. 6, the upper electrode 137 is formed in the form of a split electrode over the entire color change panel 130.

As shown in FIG. 7A, when the switch SW connected to the lower electrode 133 and the upper electrode 137 is turned off and the voltage is not supplied to the color change panel 130, the electrochromic layer 135 ) Does not cause a redox reaction. For this reason, the electrochromic layer 135 is non-displayed with a color such as black and becomes a transmission state.

As shown in FIG. 7B, when the switch SW connected to the lower electrode 133 and the upper electrode 137 is turned on and a voltage is supplied to the color change panel 130, the electrochromic layer 135 is formed. It causes a redox reaction. Therefore, the electrochromic layer 135 displays a color such as black and is in a non-transmissive state. In this case, the electrochromic layer 135 has the darkest color change layer 135b formed in the region adjacent to the lower electrode 133, and a non-color change layer or a light color change layer 135a is formed on the color change layer 135b.

DC voltage is supplied to the lower electrode 133 and the upper electrode 137. Since the lower electrode 133 is selected as the cathode electrode, a negative voltage is supplied, and since the upper electrode 137 is selected as the anode electrode, a positive voltage is supplied.

As shown in FIG. 7B, when a negative voltage is supplied to the lower electrode 133, a color change layer 135b is formed on a surface adjacent to the lower substrate 131. When the color change layer 135b is formed on a surface adjacent to the lower substrate 131, the transmitted light transmitted through the lower substrate 131 may be minimized. Therefore, when the color change panel is discolored to black color, the light blocking property can be improved, thereby preventing the problem of light leakage in the direction of the upper substrate 139 or the light emitting panel.

As shown in FIGS. 8A and 8B, the upper electrode 137 is formed in a stripe form (a) or in a mesh form (b). When the upper electrode 137 is formed in a stripe shape (a) or a mesh shape (b), the resistance of the electrode can be reduced. 8 illustrates only an example in which the upper electrode 137 is configured as a stripe form (a) or a mesh form (b). However, the upper electrode 137 may be formed to occupy all regions except the transmissive region of the light emitting panel.

Second Embodiment

9 is a view for explaining the cross-sectional structure of the color change panel according to the second embodiment of the present invention, Figure 10 is a view for explaining the driving characteristics of the color change panel shown in FIG.

As shown in FIG. 9, the color change panel 130 according to the second embodiment of the present invention includes a lower substrate 131, a lower electrode 133, an electrochromic layer 135, an upper electrode 137, and an upper substrate. 139 is included.

The lower substrate 131 and the upper substrate 139 of the color change panel 130 are selected as transparent substrates. The lower substrate 131 and the upper substrate 139 may be one selected from polyester sulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), and polycarbonate (PC). It is not limited to this.

The electrochromic layer 135 causes a reversible redox reaction and converts colors. The electrochromic layer 135 displays (colors) or non-displays (colors) a color such as black by the voltage supplied through the lower electrode 133 and the upper electrode 137.

The electrochromic layer 135 may use a viologen-based material. Viologen consists of a mixture of solution or gel type. Since viologen discolors in the reduction reaction, it reacts in the cathode region and is distributed around the cathode. Since viologen has a characteristic in that a light blocking rate is improved by increasing a driving voltage, light blocking performance can be adjusted according to voltage.

The lower electrode 133 is formed on one surface of the lower substrate 131. The lower electrode 133 may be selected as a cathode electrode. The lower electrode 133 selected as the cathode electrode is composed of divided electrodes spaced apart from each other by a predetermined distance.

The lower electrode 133 is formed in a plate shape to cover the divided electrode 133a made of a low resistance metal material and the divided electrode 133a, and is formed of a common electrode 133b made of a transparent oxide material. When the lower electrode 133 is composed of a split electrode 133a made of a low resistance metal material and a common electrode 133b made of a transparent oxide material, voltage can be applied in a wider area. In addition, as the low-resistance metal material is included, the voltage for driving the electrochromic layer 135 may be lowered.

The split electrodes 133a are positioned in areas corresponding to the light emitting area AA and the circuit area DA so as to consider the vertical, horizontal, left, and right viewing angles of the subpixels and not to decrease the transmittance. On the other hand, the common electrode 133b is positioned to occupy the entire surface of the lower substrate 131.

The division electrode 133a is, for example, one selected from the group consisting of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), and copper (Cu). It may be an alloy of, may be made of a single layer or multiple layers. As shown in FIG. 8, the split electrode 133a may have a stripe form (a) or a mesh form (b).

The common electrode 133b may be formed of, for example, indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), indium gallium zinc oxide (IGZO), and graphene. It may be made of the same transparent conductive film.

The upper electrode 137 is formed on one surface of the lower substrate 131 or the upper substrate 139 facing the lower electrode 133. The upper electrode 137 may be selected as an anode electrode. The upper electrode 137 selected as the anode electrode is formed of a divided electrode formed to occupy the entire surface of the upper substrate 139 or divided to be spaced a predetermined distance apart.

The upper electrode 137 is made of a transparent oxide material. The upper electrode 137 may be formed of, for example, indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), indium gallium zinc oxide (IGZO), and graphene. It may be made of the same transparent conductive film. The upper electrode 137 is positioned in an area corresponding to the light emitting area AA and the circuit area DA.

As shown in FIG. 10A, when the switch SW connected to the lower electrode 133 and the upper electrode 137 is turned off and the voltage is not supplied to the color change panel 130, the electrochromic layer 135 ) Does not cause a redox reaction. For this reason, the electrochromic layer 135 is non-displayed with a color such as black and becomes a transmission state.

As shown in FIG. 10B, when the switch SW connected to the lower electrode 133 and the upper electrode 137 is turned on to supply a voltage to the discoloration panel 130, the electrochromic layer 135 is formed. It causes a redox reaction. Therefore, the electrochromic layer 135 displays a color such as black and is in a non-transmissive state. In this case, the electrochromic layer 135 has the darkest color change layer 135b formed in the region adjacent to the lower electrode 133, and a non-color change layer or a light color change layer 135a is formed on the color change layer 135b.

DC voltage is supplied to the lower electrode 133 and the upper electrode 137. Since the lower electrode 133 is selected as the cathode electrode, a negative voltage is supplied, and since the upper electrode 137 is selected as the anode electrode, a positive voltage is supplied.

As shown in FIG. 10B, when a negative voltage is supplied to the lower electrode 133, the color change layer 135b is formed on a surface adjacent to the lower substrate 131. When the color change layer 135b is formed on a surface adjacent to the lower substrate 131, the transmitted light transmitted through the lower substrate 131 may be minimized. Therefore, when the color change panel is discolored to black color, the light blocking characteristic can be improved, thereby preventing the problem of light leakage in the direction of the upper substrate 139 or the light emitting panel.

As can be seen through the first and second embodiments, the electronic device according to the first and second embodiments of the present invention displays an image by using the display panel 150 and the color change panel 130, Since the background is displayed or not displayed, the transmittance is important. In order to increase the transmittance, a high driving voltage must be supplied to the electrode of the color fading panel 130. However, the present invention can implement an electronic device capable of increasing transmittance and lowering a driving voltage by using a low resistance split electrode. In addition, the present invention can implement an electronic device that can reduce the process and manufacturing cost by changing the upper and lower electrode structure of the color change panel.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the above-described technical configuration of the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention by those skilled in the art to which the present invention pertains. It will be appreciated that it may be practiced. Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in every respect. In addition, the scope of the present invention is represented by the following claims rather than the detailed description. In addition, all changes or modifications derived from the meaning and scope of the claims and equivalent concepts shall be construed as being included in the scope of the present invention.

110: light emitting panel 130: color change panel
SP: subpixel AA: light emitting area
DA: circuit area TA: transmission area
131: lower substrate 133: lower electrode
135: electrochromic layer 137: upper electrode
139: upper substrate 133a: split electrode
133b: common electrode

Claims (11)

A light emitting panel including sub pixels emitting light to display an image; And
Located on one surface of the light emitting panel and includes a color change panel that is discolored by a voltage supplied from the outside,
The discoloration panel
A lower substrate, an upper substrate bonded to the lower substrate, a lower electrode formed on one surface of the lower substrate, an electrochromic layer formed on the lower electrode, and on one surface of the upper substrate facing the lower substrate. It includes a formed upper electrode,
The sub pixels
A transmission region through which external light is transmitted,
A light emitting area in which a light emitting device emitting light is formed;
A circuit region in which a driving device for driving the light emitting device is formed;
The upper electrode is located only in an area corresponding to the light emitting area and the circuit area,
At least one of the lower electrode and the upper electrode includes a divided electrode divided to be separated from each other by a predetermined distance. The method of claim 1,
At least one of the lower electrode and the upper electrode
And the common electrode formed in a plate shape to cover the divided electrode and the divided electrode. The method of claim 2,
The split electrode is made of a metal material,
The common electrode is an electronic device, characterized in that made of a transparent oxide material. delete delete The method of claim 1,
The lower electrode and the upper electrode
Electronic device characterized in that formed in the form of the split electrode. The method of claim 6,
The lower electrode is
And the common electrode formed in a plate shape to cover the divided electrode and the divided electrode. The method of claim 1,
The discoloration panel
An electronic device, characterized in that the discoloration layer is formed on the surface adjacent to the lower substrate. The method of claim 1,
The electrochromic layer comprises a viologen-based material. The method of claim 1,
The upper electrode is
The electronic device is positioned to correspond to all areas except the transmission area of the light emitting panel. The method of claim 1,
The display panel including the light emitting panel and the color change panel
An electronic device displaying an image through the light emitting area and passing a background through the light transmitting area or displaying black.

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