TWI520399B - Organic light-emitting device and method for fabricating the same, and image display system employing the same - Google Patents

Description

Organic light-emitting device, manufacturing method thereof, and image display system therewith

The present invention relates to an organic light-emitting device, and more particularly to an organic light-emitting device having an auxiliary electrode.

The organic electroluminescent device is a photovoltaic element that converts electrical energy into light energy and has high conversion efficiency. Its common use is lighting source, or as a display panel. Since the organic electroluminescent device has some characteristics, such as no viewing angle limitation, simple process, low cost, high response speed, wide temperature range, and full color, it meets the requirements of display characteristics in the multimedia era, and has been widely used in recent years. Research.

In order to meet the demand for flat panel displays, in recent years, organic electroluminescent devices have gradually evolved toward large sizes to provide sufficient display areas. The light-emitting side transparent electrode of the organic electroluminescent device is usually made of a transparent conductive material such as indium tin oxide (ITO), but such a material has a relatively high resistance value compared with the metal conductive material. Therefore, when the display area of the organic electroluminescent device is larger, the IR electric drop is more likely to occur in the array of the organic electroluminescent device, resulting in an image mura of the organic electroluminescent device. And seriously affecting organic electricity The display quality of the excitation light element.

In order to improve the above IR voltage drop, a plurality of counter electrodes are further disposed in the active area to be electrically connected to the light-emitting side transparent electrode. In the prior art, in order to ensure a smooth electrical connection between the auxiliary electrode and the light-emitting side transparent electrode, it is necessary to use a high-precision metal mask to form an organic material layer of the organic electroluminescent element in the process. The layer of the organic material is prevented from covering the auxiliary electrode, so that the electrode formed later cannot be smoothly turned on with the auxiliary electrode. However, as the pixel area becomes smaller and the display area becomes larger and larger, the use of high-precision metal masks in the process will result in the complexity and cost of the vapor deposition process of the organic electroluminescent device. The size of the element is getting smaller and smaller, and the high-precision metal mask opening is difficult to shrink to a very small size, and it is difficult to evaporate because the opening is too small. In addition to the high-precision metal mask, the high-precision metal mask is easily bent and deformed due to the weight problem, resulting in a problem of misalignment. Therefore, there is a need to develop a problem that the auxiliary electrode and the light-emitting side transparent electrode can be smoothly electrically connected without using a high-precision metal mask.

The invention discloses an organic light emitting device. The organic light-emitting device includes a substrate, a first electrode and an auxiliary electrode are formed on the substrate, wherein the first electrode and the auxiliary electrode have a gap on the projection surface of the substrate and are electrically insulated from each other, and a pixel a defining layer is disposed between the first electrode and the auxiliary electrode; an organic material layer is formed on the pixel defining layer, the first electrode and the auxiliary electrode; and a second electrode is formed on the organic material layer; A conductive element passes through the organic material layer to electrically connect the second electrode and the auxiliary electrode.

Another embodiment of the present invention provides a manufacturing method of an organic light emitting device. The method includes: forming a first electrode and an auxiliary electrode on a substrate; forming a pixel defining layer between the first electrode and the auxiliary electrode; forming an organic material layer on the pixel defining layer, the method a first electrode and the auxiliary electrode; a conductive paste disposed on the auxiliary electrode; a drying process of the conductive paste to obtain a conductive element in direct contact with the auxiliary electrode; and forming a second electrode Above the organic material layer, the second electrode is electrically connected to the auxiliary electrode by the conductive element.

According to other embodiments of the present invention, the present invention also provides an image display system comprising: an electronic device. The electronic device includes: a display device, wherein the display device comprises the above-mentioned organic light-emitting device; and an input unit coupled to the display device, wherein the input unit transmits a signal to the display device to generate an image .

2-2’‧‧‧ Tangent

3‧‧‧Substrate

4‧‧‧ gate

5‧‧‧ gate insulation

6‧‧‧ source

7‧‧‧Area

8‧‧‧汲polar

9‧‧‧ channel

10‧‧‧Organic lighting device

11‧‧‧Active Area

12‧‧‧Dielectric layer

13‧‧‧flat layer

14‧‧‧First electrode

16‧‧‧Auxiliary electrode

17‧‧‧ first opening

18‧‧‧ pixel definition layer

19‧‧‧ second opening

20‧‧‧Organic material layer

21‧‧‧Conductive adhesive

92‧‧‧Connecting components

24‧‧‧second electrode

31-36‧‧‧Steps

100‧‧‧ display device

150‧‧‧ input unit

200‧‧‧Electronic devices

H1‧‧‧second opening depth

H2‧‧‧Connecting element height

W1‧‧‧second opening width

W2‧‧‧ conduction element width

1 is a flow chart showing the process steps of a method of fabricating an organic light-emitting device according to an embodiment of the present invention.

2 is a schematic plan view showing an active region of an organic light-emitting device according to an embodiment of the present invention.

3-7 show a series of cross-sectional structural diagrams for explaining the manufacturing process of the organic light-emitting device according to the embodiment of the present invention.

Fig. 8 is an enlarged schematic view of a region 7 of Fig. 7.

Figure 9 is a plan view showing a conductive element according to an embodiment of the present invention as a continuous film layer.

10 and 11 are plan views for explaining that the conduction elements according to other embodiments of the present invention are composed of a plurality of conductive islands.

Fig. 12 is a schematic sectional view showing the structure of an organic light-emitting device obtained by the manufacturing process of the organic light-emitting device according to Figs. 3-7.

13-14 are a series of cross-sectional structural diagrams for explaining the manufacturing steps of the organic light-emitting device according to another embodiment of the present invention.

Figure 15 is a diagram showing a series of cross-sectional structural views for explaining the steps of fabricating an organic light-emitting device according to some embodiments of the present invention.

Figure 16 is a block diagram showing an image display system according to an embodiment of the invention.

The numbers and symbols corresponding to the different features are generally considered to be corresponding parts unless otherwise noted. The features illustrated are clearly labeled in the relevant embodiments and are not necessarily drawn to scale.

The following is a detailed description of the embodiments and examples accompanying the drawings, which are the basis of the present invention. In the drawings, the shape or thickness of the embodiment may be expanded and simplified or conveniently indicated. Furthermore, the components of the drawings will be described separately, and it is noted that the components not shown or described in the drawings are known to those of ordinary skill in the art and, in addition, The examples are merely illustrative of specific ways of using the invention and are not intended to limit the invention.

An embodiment of the invention provides a method of fabricating an organic light emitting device. Please refer to FIG. 1 , which is a flow chart of a manufacturing process of the method for manufacturing the organic light-emitting device. In step 31, a first electrode and an auxiliary electrode are formed on a substrate. In step 32, a pixel definition layer is formed over the first electrode and the auxiliary electrode. In step 33, an organic material layer is formed on the pixel definition layer, the first electrode, and the auxiliary Above the electrode. In step 34, a conductive paste is disposed over the auxiliary electrode. In step 35, a drying process is performed on the conductive paste to obtain a conductive element in contact with the auxiliary electrode. In step 36, a second electrode is formed on the organic material layer, wherein the second electrode is electrically connected to the auxiliary electrode through the conductive element.

Hereinafter, a method of manufacturing an organic light-emitting device according to the present invention will be described in accordance with an embodiment of the present invention.

First, referring to Fig. 2, the substrate 3 and the active region 11 of an organic light-emitting device 10 are shown. For convenience of explanation, only the portions of the substrate 3 and the active region are shown in a simplified manner. A flat layer 13 is disposed in the active region 11 , and a first electrode 14 and an auxiliary electrode 16 are respectively disposed on the flat layer 13 , wherein the first electrode 14 and the auxiliary electrode 16 are not electrically connected, and are mutually connected The first electrode 14 and the auxiliary electrode 16 are not in contact with each other and are separated from each other by a gap. The projection surface is the second view in the direction of the substrate 3 of the organic light-emitting device 10 in a vertical plan. The substrate surface, the first electrode 14 and the auxiliary electrode 16 are spaced apart from each other and electrically insulated from each other. Please refer to FIG. 3 , which is a schematic cross-sectional view of the second tangent line 2-2 ′. The first electrode 14 can be further electrically connected to a drain 8 of a thin film transistor previously disposed on the substrate 3 . . In addition, the thin film transistor may include a source 6, a channel 9, and a gate 4, wherein the gate 4 is separated from the source 6, the drain 8, and the channel 9 by a gate insulating layer 5, and the flat layer The 13 series is formed on a dielectric layer 12.

The flat layer 13 has a relatively flat surface, and the film layer formed thereon can have a lower roughness. For example, the planar layer 13 is a film layer having insulating properties, which may be, for example, a dielectric material. The first electrode 14 and the auxiliary electrode 16 may be formed simultaneously in the same step or separately by different steps. For example, the first electrode 14 and the auxiliary electrode 16 are formed of the same material in the same step. The formation method can be, for example, chemical vapor deposition (CVD), physical vapor deposition (PVD), plasma enhanced chemical vapor deposition (PECVD), and often Atmospheric pressure chemical vapour deposition (APCVD), high density chemical vapor deposition (HDCVD), low pressure chemical vapor deposition (LPCVD), Or sputtering. The first electrode 14 and the auxiliary electrode 16 may be multilayer electrodes such as ITO/Ag/ITO or ITOACX/Mo.

Here, the organic light-emitting device 10 can be, for example, a top-emission organic light-emitting device, and the first electrode 14 can be, for example, a reflective electrode having a reflectance of about 50-99%, preferably more than 90%. For example, it may be a metal layer having a relatively high film thickness, for example, aluminum (Al), copper (Cu), molybdenum (Mo), titanium (Ti), platinum (Pt), iridium (Ir), nickel (Ni), An opaque metal layer formed of chromium (Cr), silver (Ag), gold (Au), tungsten (W), or an alloy thereof. When the first electrode 14 is a multilayer electrode, the opaque metal layer is located at the bottom (ie, the lowermost layer away from the luminescent layer).

Next, referring to FIG. 4, a pixel defining layer 18 is formed on the flat layer 13, and a first opening 17 and a second opening 19 are defined. The first opening 17 exposes the first electrode 14 and the second opening 19 exposes an auxiliary electrode 16. The material of the pixel defining layer 18 is an insulating material, which may be an organic resin (for example, polyimide) or a dielectric material (such as an oxide, a nitride or an oxynitride). Still referring to FIG. 4, the second opening 19 has a depth H1 and a minimum cross-sectional width W1.

Next, referring to FIG. 5, compliant formation of an organic material layer 20 The pixel defining layer 18, the first electrode 14, and the auxiliary electrode 16 are over. It should be noted that in this embodiment, the organic material layer 20 is formed integrally and covers the active region 11 of the light-emitting device. Therefore, in the step of forming the organic material layer 20, high-precision metal masks may not be used (fine Metal mask) is graphical. However, in other embodiments, the organic material layer 20 can also be patterned, but it is not necessary to use a high-precision metal mask to perform a patterning process in which the pixel area is accurately aligned and the auxiliary electrode region is avoided. That is, for example, the organic material layer may be formed on the active region 11 by a low-precision metal mask, such as a strip pattern or other area-shaped pattern, and the organic material layer may cover the active region 11 at the same time. A portion of the first electrode 14 and a portion of the auxiliary electrodes 16 are disposed instead of being fully covered.

Therefore, the organic material layer 20 is formed on the auxiliary electrode 16 and is in direct contact with the auxiliary electrode 16. Since the present invention electrically connects the auxiliary electrode 16 to the subsequently formed transparent electrode through the organic material layer 20 by using a subsequently formed conductive element, it is not necessary to use a high-precision metal mask to accurately form a size equivalent to the pixel area. The first electrode 14 and the method of avoiding the auxiliary electrode 16 can reduce the complexity and cost of the process compared with the process of the conventional organic light-emitting device, and can avoid the alignment deviation caused by using a high-precision metal mask. And other issues.

The organic material layer 20 may include at least one light emitting layer (for example, a red light emitting layer, a blue light emitting layer, and a green light emitting layer), and may further include other conventional film layers (for example, a hole injection layer, electricity). Hole transport layer, electron transport layer, electron injection layer, or barrier layer).

Each of the film layers of the organic material layer 20 may be a small molecule organic electroluminescent material or a polymer organic electroluminescent material, and the organic light may be formed by vacuum evaporation or by coating, inkjet, screen printing, or the like. A layer of diode material. this In addition, each of the luminescent layers of the organic material layer 20 may comprise an organic electroluminescent material and a dopant, which may be changed by those skilled in the art, depending on the organic electroluminescent material used and the required component characteristics. The doping amount of the dopant. The dopant may be an energy transfer type dopant material or a carrier trapping type dopant material. The organic electroluminescent material can be a fluorescent luminescent material. In some preferred embodiments of the invention, the organic electroluminescent material can also be a phosphorescence luminescent material. Those skilled in the art can change the organic material layer according to the organic electroluminescent material used and the required component characteristics. Therefore, the film composition, material, and thickness of the organic material layer are not characteristic of the present invention, and are not limiting The basis of the scope of the invention.

Next, referring to FIG. 6, a layer of organic material 20 on the auxiliary electrode 16 in the second opening 19 is disposed. Among them, a method of imparting the conductive paste 21 to the organic material layer 20 may be, for example, a screen printing method, an inkjet method, or a dispenser method.

The conductive paste used in this embodiment is not limited and may be a suitable conductive paste composition which is conventionally used. For example, the conductive paste may comprise a conductive material, and a solvent. The conductive material includes gold, silver, copper, aluminum, titanium, or a mixture thereof, and the conductive material may be in the form of a pellet, a tube, a rod, a sheet, or a combination thereof. For example, the electrically conductive material can be silver particles having a particle size between 0.01 μm and 3 μm. The solvent used for the conductive paste may be, for example, a ketone solvent, an alcohol solvent, an ether solvent, an ester solvent, or a mixture thereof. In certain embodiments of the invention, the ketone solvent may be, for example, acetone, cyclohexanone or isophorone; the alcohol solvent may include ethanol, terpineol, or ethylene glycol; the ether solvent may include ethylene glycol. Methyl ether, or ethylene glycol butyl ether; the ester solvent may include ethyl acetate or butyl lactate. Furthermore, other implementations in accordance with the invention For example, the conductive paste may further comprise a resin such as acrylic resin, epoxy resin, ethylene vinyl acetate resin, polycarbonate (PC), polystyrene (PS). , polyvinyl alcohol, or polyvinyl pyrrolidone.

When the conductive paste 21 is disposed on the organic material layer 20, the solvent having a proper composition ratio in the conductive paste 21 further dissolves the organic material layer 20, thereby causing the conductive paste 21 to contact the auxiliary electrode 16 through the organic material layer 20. Therefore, after the step of applying the conductive paste 21 to the organic material layer 20 and after a period of time, the conductive paste is subjected to a drying process, so that the solvent in the conductive paste is removed, and a conductive element 22 is traversed through the organic material layer. 20 is in direct contact with the auxiliary electrode 16, please refer to Fig. 7. The process temperature of the above drying process may be, for example, between 50 and 120 ° C, and the drying time may be between 1 and 60 minutes. In other embodiments, the process temperature may vary depending on the ratio of the conductive adhesive material to the composition, and is not limited thereto.

Further, please refer to Fig. 8, which is an enlarged schematic view of a region 7 of Fig. 7, from which the conduction element 22 has a width W2 and a height H2. It should be noted that the width W2 of the resulting conduction element 22 can be adjusted by controlling the volume of the conductive paste 21, and the height H2 of the resulting conduction element 22 can be adjusted by controlling the composition ratio and viscosity of the conductive paste 21. The ratio of the width W2 of the conductive element 22 to the width W1 of the second opening 19 may be between 0.05-1; and the ratio of the height H2 of the conductive element 22 to the depth H1 of the second opening 19 may be 0.05. Between -1.

Referring to FIG. 9, according to an embodiment of the present invention, the resulting conductive element 22 can be a continuous film layer, that is, the conductive adhesive is in the range of the second opening 19 and does not extend beyond the second opening 19 to be continuously coated. The cloth pattern is formed on the organic material layer 20, and then dried to form the conductive element 22; further, according to other embodiments of the present invention, The resulting conductive element 22 can also be a discontinuous film layer (ie, the conductive paste is formed on the organic material layer 20 in a discontinuous coating manner). Furthermore, according to another embodiment of the present invention, the distance between any two adjacent conducting elements 22 is equal, please refer to FIG. 10; and according to other embodiments of the present invention, the distance between any two adjacent conducting elements 22 is If they are not equal, or are connected in a straight line, please refer to Figure 11 for the spacing.

Finally, referring to FIG. 12, a second electrode 24 is formed on the organic material layer 20, and the second electrode 24 is directly in contact with the conduction element 22 to complete the organic light-emitting device 10 of the present invention. The second electrode 24 is electrically connected to the auxiliary electrode 16 via the conduction element 22 . Here, the second electrode is located on the light exiting side of the organic light emitting device and is a transparent electrode. The material of the second electrode may be a metal oxide, a light transmissive metal layer, or a combination thereof. For example, the material of the second electrode may be, for example, indium oxide, indium tin oxide (ITO), titanium dioxide, cadmium oxide, gallium oxide, Zinc oxide, ZnO, Gallium Zinc Oxide, GZO, tantalum oxide, gallium indium oxide (GIO), niobium pentoxide, zinc dioxide (zinc dioxide), zinc stannate, cadmium Stannate, zinc indium oxide (IZO), aluminum zinc oxide (AZO), indium oxide (magnesium indium oxide) , or tin dioxide, cerium-containing oxides, titanium-containing oxides, zirconium-containing oxides, hafnium-containing oxides and/or An oxide of tantalum. The method for forming the second transparent electrode 24 is not limited, and may be, for example, chemical vapor deposition (CVD), physical vapor deposition (PVD), plasma-assisted chemical vapor deposition (plasma). Enhanced chemical vapor Deposition, PECVD, atmospheric pressure chemical vapor deposition (APCVD), high density chemical vapor deposition (HDCVD), low pressure chemical vapor deposition (low pressure) Chemical vapor deposition, LPCVD), or sputtering.

In the manufacturing method of the above organic light-emitting device 10, the step of disposing the conductive paste on the auxiliary electrode is completed after the step of forming the organic material layer, so that the conductive adhesive is disposed on the organic material layer and is in direct contact therewith. . Since the proper amount of the conductive paste dissolves the organic material layer, the conductive paste is in contact with the auxiliary electrode through the organic material layer. Therefore, after the conductive paste is subjected to a drying process, the conductive member passes through the organic material layer to be in contact with the auxiliary electrode.

In addition, according to another embodiment of the present invention, the conductive paste may be disposed on the auxiliary electrode before the step of forming the organic material layer, so that the conductive adhesive is disposed on the auxiliary electrode and is in direct contact therewith. Referring to FIG. 13, after the step of forming the pixel defining layer 18 on the planar layer 13 and defining the first opening 17 and the second opening 19 is completed, a conductive paste 21 is disposed in the second opening. On the auxiliary electrode 16 in the 19, the conductive paste 21 is directly in contact with the auxiliary electrode 16, and a conductive element 22 is formed after the conductive paste is dried. Next, an organic material layer 20 is formed on the pixel defining layer 18, the first electrode 14, the auxiliary electrode 16, and the conductive element 22 in compliance. Therefore, after the conductive paste 21 is subjected to a drying process, the resulting conductive member 22 can be convex so that a difference is formed when the organic material layer 20 is applied without completely covering the conductive member 22. Referring to FIG. In this way, since the organic material layer 20 has a difference in coverage to expose a portion of the conductive element 22, when the second electrode 24 is formed on the organic material layer 20, the conductive element 22 can be in contact with the second electrode 24, so that The second electrode 24 can be electrically connected to the auxiliary electrode 16 through the conductive element 22 . Therefore regardless of the organic material layer The second electrode 24 and the conductive element 22 can be electrically connected to each other on the active region 11 or on the portion of the auxiliary electrode 16 that covers the active region 11 by the patterning portion. Therefore, it is not necessary to consider complicated process problems that cannot be covered to the auxiliary electrode when using a conventional high-precision metal mask.

In addition, according to other embodiments of the present invention, the conductive paste may be disposed on the second electrode after the step of forming the second electrode, such that the conductive paste is disposed on the second electrode and in direct contact therewith. Referring to FIG. 15, after the second electrode 24 is formed, a conductive paste 21 is disposed on the second electrode 24 in the second opening 19. It should be noted that, in addition to the conductive material, the solvent, and the resin, the conductive paste 21 used herein must further contain an acidic solution of a suitable composition ratio for etching the second electrode 24 so that the conductive paste 21 penetrates the first portion. The two electrodes and the organic material layer 20 do not penetrate the auxiliary electrode 16 and are in contact with the auxiliary electrode 16. For example, the second electrode 24 can be indium tin oxide (ITO), and the conductive paste 21 can comprise a suitable ratio of oxalic acid solution for etching indium tin oxide. Finally, the conductive paste 21 is subjected to a drying process, and the conductive element 22 can pass through the second electrode 24 and the organic material layer 20, so that the second electrode 24 can be electrically connected to the auxiliary electrode 16 through the conductive element 22.

FIG. 16 is a block diagram showing an image display system according to another embodiment of the present invention, which can be implemented on a display device 100 or an electronic device 200, such as a notebook computer, a mobile phone, a digital camera, a personal digital assistant, and a desktop device. Computer, TV, car display, or portable player. The organic light-emitting device 10 according to the present invention may be disposed on the display device 100, and the display device 100 may be a full-color organic electroluminescent display. In other embodiments, the display device 100 can be disposed in the electronic device 200. As shown in FIG. 16, the electronic device 200 includes a display device 100 and an input unit 150. The input unit 150 is coupled to the flat display device 100 for providing an input signal. A number (eg, an image signal) is applied to the display device 100 to generate an image.

The foregoing has been described in terms of the embodiments of the invention It will be apparent to those skilled in the art that the present invention can be understood and utilized in the <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; A person skilled in the art should be able to understand the corresponding description without departing from the spirit and scope of the invention, and various changes, substitutions and modifications can be made without departing from the spirit and scope of the invention.

2-2’‧‧‧ Tangent

3‧‧‧Substrate

4‧‧‧ gate

5‧‧‧ gate insulation

6‧‧‧ source

7‧‧‧Area

8‧‧‧汲polar

9‧‧‧ channel

12‧‧‧Dielectric layer

13‧‧‧flat layer

14‧‧‧First electrode

16‧‧‧Auxiliary electrode

18‧‧‧ pixel definition layer

20‧‧‧Organic material layer

22‧‧‧Connecting components

24‧‧‧second electrode

Claims (10)

An organic light-emitting device includes: a substrate; a first electrode and an auxiliary electrode are formed on the substrate, wherein the first electrode and the auxiliary electrode have a gap on a projection surface of the substrate and are electrically insulated from each other, and a pixel defining layer is disposed between the first electrode and the auxiliary electrode; an organic material layer is formed on the pixel defining layer, the first electrode and the auxiliary electrode; and a second electrode is formed on the organic material layer And a conductive element passing through the organic material layer to electrically connect the second electrode and the auxiliary electrode. The organic light-emitting device of claim 1, wherein the pixel defining layer has a first opening and a second opening, wherein the first opening exposes the first electrode and the second opening exposes the auxiliary electrode . The organic light-emitting device of claim 2, wherein a width ratio of the conductive element to the width of the second opening is between 0.05 and 1. The organic light-emitting device of claim 2, wherein a height ratio of the conductive element to the second opening is between 0.05 and 1. A method of manufacturing an organic light-emitting device, comprising: forming a first electrode and an auxiliary electrode on a substrate; forming a pixel defining layer between the first electrode and the auxiliary electrode; forming an organic material layer on the drawing a definition layer, the first electrode, and the a conductive paste is disposed on the auxiliary electrode; a drying process is performed on the conductive paste to obtain a conductive element in direct contact with the auxiliary electrode; and a second electrode is formed on the organic material layer, wherein The second electrode is electrically connected to the auxiliary electrode by the conductive element. The method of manufacturing an organic light-emitting device according to claim 5, wherein the step of disposing the conductive paste on the auxiliary electrode is after the step of forming the organic material layer, and the conductive element is after the drying process The organic material layer is passed through to contact the auxiliary electrode. The method of manufacturing an organic light-emitting device according to claim 5, wherein the step of disposing the conductive paste on the auxiliary electrode is before the step of forming the organic material layer, and the conductive element is after the drying process Contact with the auxiliary electrode. The method of fabricating an organic light-emitting device according to claim 5, wherein the step of arranging the conductive element over the auxiliary electrode is after the step of forming the second electrode, and the conductive element is after the drying process The organic material layer and the second electrode are passed through to contact the auxiliary electrode. An image display system comprising: an electronic device, wherein the electronic device comprises: a display device, wherein the display device comprises the organic light-emitting device according to claim 1; An input unit is coupled to the display device, wherein the input unit transmits a signal to the display device to generate an image. The image display system of claim 9, wherein the electronic device is a mobile phone, a digital camera, a personal digital assistant, a notebook computer, a desktop computer, a television, a car display, or a portable digital audio and video disc. player.