CN101059738A - Transparent touch screen with upward-emitting organic light-emitting diodes - Google Patents

Abstract

The invention discloses a transparent touch screen of an upward light-emitting type organic light-emitting diode, which comprises a substrate, an upper cover plate, an organic light-emitting diode display element, a capacitive touch element and a sealing adhesive layer. The organic light-emitting diode device is superposed on the substrate, the capacitive touch element is superposed on the upper cover plate, and the sealing adhesive layer is respectively jointed with the substrate and the upper cover plate, so that the organic light-emitting diode device and the capacitive touch element are sealed between the substrate and the upper cover plate. The capacitive touch element is formed with a first transparent conductive layer, a blocking layer, a second transparent conductive layer and an electromagnetic shielding layer on the upper cover plate in sequence, and the electromagnetic shielding layer can effectively reduce the electric field interference between the organic light emitting diode device and the capacitive touch element. The touch panel can accurately and sensitively sense touch operation and can be widely applied to various display screens capable of clicking input instructions.

Description

Transparent touch screen with upward-emitting organic light-emitting diodes

technical field

The present invention relates to a transparent touch screen, in particular to a transparent touch screen (touch screen) of an upward-emitting organic light emitting diode (Organic Light Emitting Device; OLED).

Background technique

Currently, OLED display devices can be classified into two types of light emitting types: bottom emitting type and upward emitting type. Since the light emitted by the bottom-emitting structure will be shielded by the thin-film transistor (TFT) structure on the substrate and affect the aperture ratio (aperture ratio), the upward-emitting structure is an effective solution to solve the light-emitting area ratio on traditional active light-emitting diode display devices. Countermeasures.

Touch screen is currently the most simple, user-friendly and space-saving input tool. It has been widely used in tourist guide systems, automatic teller machines, palmtop computers, point-of-sale terminals and industrial control systems.

U.S. Patent Publication No. US 2002/0186208 A1 discloses an electroluminescent display device with a touch screen, which includes a transparent substrate, a resistive touch element disposed on the surface of the transparent substrate, and another touch element disposed on the transparent substrate. Electrodisplay elements on the surface. However, preparing the resistive touch element and the electroluminescent display element on the two surfaces of the transparent substrate respectively is prone to scratches during the production process. Furthermore, the resistive touch element has the disadvantage of poor sensitivity.

US Patent Publication No. US 2004/0080267 A1 discloses an integrated component of an organic light emitting display and a touch screen, which pre-prepares a resistive touch element on a cover plate of the organic light emitting display, and then uses the cover plate to package the organic light emitting display. However, the sensitivity of the resistive touch element is not good, and the resistive touch element must be pressed with a pointed object such as a pen to sense, so it is easy to be scratched during use. Furthermore, during the process of using the cover plate to package the organic light emitting display, the resistive touch element prefabricated on the surface of the cover plate is easily damaged by pressure.

US Patent Publication No. US 2004/0080267 A1 discloses an integrated component of an organic light emitting display and a touch screen, which prepares a resistive touch element on the surface of the transparent substrate (or cover) of the packaged organic light emitting display. However, the manufacturing method disclosed in US 2004/0080267 A1 is quite complicated, and the service life of the materials of the organic light-emitting display will be shortened due to the process factor of the resistive touch element. Furthermore, the resistive touch element has the disadvantage of poor sensitivity.

To sum up, the market needs a touch panel capable of accurately and sensitively sensing touch operations, and also needs to have a light-transmitting structure so as to be widely used in various display screens that can input commands by clicking.

Contents of the invention

The purpose of the present invention is to provide a transparent touch screen with upward light-emitting organic light emitting diodes, which has the advantages of high light transmittance, high sensitivity, and not easily scratched.

The transparent touch screen of the upward emitting organic light emitting diode of the present invention comprises a substrate, an upper cover, an organic light emitting diode device, a capacitive touch element and a sealant layer.

The organic light emitting diode device is stacked on the substrate, the capacitive touch element is stacked on the upper cover, and the sealant layer is respectively bonded to the substrate and the upper cover, so that the organic light emitting diode device is sealed on the upper cover. between the substrate and the upper cover.

The capacitive touch element is sequentially formed with a first transparent conductive layer, a barrier layer and a second transparent conductive layer on the surface of the upper cover, and the capacitive touch element is sealed between the substrate and the upper cover.

The sensing principle of the capacitive touch element is to use the first transparent conductive layer and the second transparent conductive layer to externally connect power and signal lines, so that a capacitance structure is formed between the two transparent conductive layers and a fixed The power line, and the strength of the power line will directly affect the capacitance value. When a conductive material or a finger touches the upper cover, the strength of the electric force line between the first transparent conductive layer and the second transparent conductive layer will be changed, and the capacitance value will change accordingly. Detect the change of the capacitance value to achieve the purpose of distinguishing the touch position.

The capacitive touch element may further include an electromagnetic shielding layer, and the electromagnetic shielding layer includes a polymer insulating layer and a transparent conductive layer. The electromagnetic shielding layer can effectively reduce the electric field interference between the organic light emitting diode structure and the capacitive touch element.

The material of the polymer insulation layer is selected from epoxy resin, polyimide or methyl methacrylate. The material of the above-mentioned transparent conductive layer is selected from indium tin oxide, indium zinc oxide or aluminum zinc oxide.

The touch panel of the present invention can accurately and sensitively sense touch operations, and can be widely used in various display screens where commands can be clicked and input.

Description of drawings

1 is a schematic cross-sectional view of a transparent touch screen with an upward-emitting organic light-emitting diode according to a first embodiment of the present invention;

2 is a schematic cross-sectional view of a transparent touch screen with upward-emitting organic light-emitting diodes according to a second embodiment of the present invention;

3 is a schematic cross-sectional view of a transparent touch screen with an upward-emitting organic light-emitting diode according to another embodiment of the present invention; and

FIG. 4 is a schematic cross-sectional view of a transparent touch screen with upward emitting organic light emitting diodes according to another embodiment of the present invention.

Wherein, the reference signs are explained as follows:

10, 20, 30, 40 transparent touch screen

100 capacitive touch element 101 first transparent conductive layer

102 barrier layer 103 second transparent conductive layer

120 organic light emitting diode device 121 anode layer

122 light-emitting layer 123 cathode layer

130 Substrates 150 Sealing Layers

200 capacitive touch element 204 electromagnetic shielding layer

204a polymer insulation layer 204b transparent conductive layer

Detailed ways

FIG. 1 is a schematic cross-sectional view of a transparent touch screen 10 with upward emitting organic light emitting diodes according to a first embodiment of the present invention. The transparent touch screen 10 includes a substrate 130 , a top cover 110 , an OLED device 120 , a capacitive touch element 100 and a sealant layer 150 .

The organic light emitting diode device 120 is stacked on the substrate 130, the capacitive touch element 100 is stacked on the surface of the upper cover 110, the sealant layer 150 is respectively bonded to the substrate 130 and the upper cover 110, The OLED device 120 is sealed in a closed space.

In the capacitive touch element 100 , a first transparent conductive layer 101 , an insulating layer 102 and a second transparent conductive layer 103 are sequentially formed on the upper cover 110 . However, the structure of the capacitive touch element is not limited to this embodiment, and the second transparent conductive layer and the first transparent conductive layer can also be formed on the surface of the upper cover 110 together.

The working principle of the capacitive touch structure 100 is to use the external power supply and signal lines of the first transparent conductive layer 101 and the second transparent conductive layer 103 to make the first transparent conductive layer 101 and the second transparent conductive layer 103 A capacitive structure is formed and a fixed power line is generated, and the strength of the power line will directly affect the capacitance value.

When a conductive substance or a finger touches the upper cover 110, the strength of the electric force line between the first transparent conductive layer 101 and the second transparent conductive layer 103 will be changed, and the capacitance value will change accordingly. Through the external signal The line detects the change of the capacitance value to achieve the identification of the touch position.

In the OLED device 120 , an anode layer 121 , a light emitting layer 122 and a cathode layer 123 are sequentially formed on the substrate 130 .

The material of the first transparent conductive layer 101 and the second transparent conductive layer 103 is selected from indium tin oxide (indium tin oxide; ITO), indium zinc oxide (indium zinc oxide; IZO) or aluminum zinc oxide (aluminum zinc oxide; AZO) ). The material of the barrier layer 102 is selected from materials such as epoxy resin (Epoxy), polyimide (Poly-Imide) or methyl methacrylate.

Materials of the substrate 130 and the upper cover 110 are selected from transparent materials such as glass, polycarbonate (PC) or polyvinyl chloride (PVC).

FIG. 2 is a schematic cross-sectional view of a transparent touch screen 20 with up-emitting organic light emitting diodes according to a second embodiment of the present invention. Different from the transparent touch screen 10 of the first embodiment of the present invention, the capacitive touch element 200 further includes an electromagnetic shielding layer 204, and the electromagnetic shielding layer 204 includes a polymer insulating layer 204a and a transparent conductive layer 204b. The capacitive touch element 200 sequentially forms the first transparent conductive layer 101, the barrier layer 102, the second transparent conductive layer 103, the polymer insulating layer 204a and the transparent conductive layer 204b on the upper cover 110. .

The electromagnetic shielding layer 204 can effectively reduce the electric field interference between the OLED device 120 and the capacitive touch element 201 .

The material of the polymer insulation layer 204a is selected from materials such as epoxy resin, polyimide, or methyl methacrylate. The material of the transparent conductive layer 204b is selected from indium tin oxide, indium zinc oxide or aluminum zinc oxide.

The transparent touch screens of upward-emitting organic light-emitting diodes in the first and second embodiments of the present invention can also be implemented in the manner of the transparent touch screens 30 and 40 in FIGS. and 200 are disposed on the upper surface of the upper cover 110 .

The technical content and technical features of the present invention have been disclosed above, but those skilled in the art may still make various substitutions and modifications based on the inspiration and disclosure of the present invention without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should not be limited to the scope disclosed in the embodiments, but should include various replacements and modifications that do not depart from the present invention, and are covered by the scope of the appended claims.

Claims (13)

1, a kind of upwards transparent touch-sensitive panel curtain of luminescent organic LED comprises:

Substrate;

Upper cover plate;

Oled device is stacked and placed on this substrate; And

The capacitive touch control elements is stacked and placed on the surface of this upper cover plate, and this upper cover plate engages this substrate, and this oled device is closed between this substrate and this upper cover plate.

2, the upwards transparent touch-sensitive panel curtain of luminescent organic LED according to claim 1, wherein this transparent touch-sensitive panel curtain also comprises adhesive layer, engage this substrate and this upper cover plate, and this oled device is closed between this substrate and this upper cover plate.

3, the upwards transparent touch-sensitive panel curtain of luminescent organic LED according to claim 1, wherein this capacitive touch control elements forms first transparency conducting layer, barrier layer and second transparency conducting layer in regular turn in the upper surface of this upper cover plate, and this first transparency conducting layer and this second transparency conducting layer form the structure of electric capacity.

4, the upwards transparent touch-sensitive panel curtain of luminescent organic LED according to claim 3, wherein this capacitive touch control elements also comprises electro-magnetic screen layer, and this electro-magnetic screen layer is stacked and placed between this first transparency conducting layer and this upper cover plate.

5, the upwards transparent touch-sensitive panel curtain of luminescent organic LED according to claim 1, wherein this capacitive touch control elements forms first transparency conducting layer, barrier layer and second transparency conducting layer in regular turn in the lower surface of this upper cover plate, and this first transparency conducting layer and this second transparency conducting layer form the structure of electric capacity.

6, the upwards transparent touch-sensitive panel curtain of luminescent organic LED according to claim 5, wherein this capacitive touch control elements also comprises electro-magnetic screen layer, and this electro-magnetic screen layer is stacked and placed on this second transparency conducting layer.

7, the upwards transparent touch-sensitive panel curtain of luminescent organic LED according to claim 3, wherein this electro-magnetic screen layer comprises polymeric dielectric layer and transparency conducting layer.

8, the upwards transparent touch-sensitive panel curtain of luminescent organic LED according to claim 7, wherein the material of this polymeric dielectric layer is selected from epoxy resin, pi or methyl methacrylate.

9, the upwards transparent touch-sensitive panel curtain of luminescent organic LED according to claim 7, wherein the material of this transparency conducting layer is selected from tin indium oxide, indium zinc oxide or aluminum zinc oxide.

10, the upwards transparent touch-sensitive panel curtain of luminescent organic LED according to claim 1, wherein this organic light-emitting diode element forms anode layer, luminescent layer and cathode layer in regular turn on this substrate.

11, the upwards transparent touch-sensitive panel curtain of luminescent organic LED according to claim 3, wherein the material of this first transparency conducting layer and this second transparency conducting layer is selected from tin indium oxide, indium zinc oxide or aluminum zinc oxide.

12, the upwards transparent touch-sensitive panel curtain of luminescent organic LED according to claim 3, wherein the material of this barrier layer is selected from epoxy resin, pi or methyl methacrylate.

13, the upwards transparent touch-sensitive panel curtain of luminescent organic LED according to claim 1, wherein the material of this substrate and this upper cover plate is selected from transparent materials such as glass, polycarbonate or Polyvinylchloride.

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