CN100444699C

CN100444699C - Two-side display apparatus

Info

Publication number: CN100444699C
Application number: CNB2006100060900A
Authority: CN
Inventors: 胡闵杰
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2006-01-26
Filing date: 2006-01-26
Publication date: 2008-12-17
Anticipated expiration: 2026-01-26
Also published as: CN1809234A

Abstract

The present invention discloses a double side display device which comprises a first basal plate and a second basal plate, wherein the second basal plate is positioned above the first basal plate. A first organic light emitting diode is arranged on the upper surface of the first basal plate, and the whole surface of the first organic light emitting diode is covered by a first protective layer. A second organic light emitting diode is arranged on the lower surface of the second basal plate, and the whole surface of the second organic light emitting diode is covered by a second protective layer. The first and the second protective layers are used for isolating oxygen gas and water vapor.

Description

Double-side display device

Technical field

The present invention relates to a kind of double-side display device, particularly relating to a kind of can effectively prevent the invasion of steam and oxygen two-sided has a dynamo-electric display unit that swashs.

Background technology

The form of electronic product is variation gradually, and double-sided display function becomes the main characteristic of electronic product of new generation.For example, the double-side display device of mobile phone inside can simultaneously show mobile phone function of tonic chord window, and another side shows the time.At present the double-side display device produced of industry is generally two single face display floaters subsides is formed, and for example a display panels and an organic electroluminescence panel be to pasting, or two organic electroluminescence panels are to subsides.

Fig. 1 is existing double-side display device.Double-side display device 10 is fitted by one first display floater 11 and one second display floater 12 and is formed.First display floater 11 has a transparency carrier 111, one first electrode 112, a luminescent layer 113, one second electrode 114 and a cap 115.First electrode 112 is formed on the transparency carrier 111.Luminescent layer 113 is between first electrode 112 and second electrode 114.The edge of cap 115 and transparency carrier 111 are fitted, and are covered on second electrode 114.In order to protect first display floater 11 not destroyed by steam, be typically provided with a drier 116 in cap 115 inboards.

Second display floater 12 also has a transparency carrier 121, a third electrode 122, a luminescent layer 123, one the 4th electrode 124 and a cap 125.Third electrode 122 is formed on the transparency carrier 121.Luminescent layer 123 is between third electrode 122 and the 4th electrode 124.The edge of cap 125 and transparency carrier 121 are fitted, and are covered on the 4th electrode 124.The cap 115 of

first display floater

11 and 125 pairs of subsides of the cap of second display floater 12 are to form double-side display device 10.Also be provided with a drier 126 in cap 125 inboards.

As mentioned above, existing double-side display device 10 has two

caps

115 and 125 and two

drier

116 and 126, therefore, is difficult to shorten the distance between two

transparency carriers

111 and 121, makes double-side display device 10 be difficult to thinning.Its reason is, in order to design the position of putting drier, must increase thickness, length or the width that shows more.For example, the

drier

116 and 126 of Fig. 1 is located on

cap

115 and 125, has had more the setting of

cap

115 and 125 jointly.In addition, drier absorbs and may cause volumetric expansion behind the steam or discharge gas and destroy light-emitting component.

Summary of the invention

The object of the present invention is to provide a kind of structure of display with double faces to avoid the invasion of steam and oxygen, and can solve the problem that above-mentioned drier is provided with, to possess lighter and thinner design.

Double-side display device of the present invention comprises: first substrate; First Organic Light Emitting Diode is arranged at this first substrate top; First flatness layer is formed at this first Organic Light Emitting Diode top; First protective layer covers all surfaces of this first flatness layer, with starvation and steam; Second substrate is positioned at this first protective layer top; Second Organic Light Emitting Diode is arranged at this second substrate below; Second flatness layer is formed at this second Organic Light Emitting Diode below; And second protective layer, cover all surfaces of this second flatness layer, with starvation and steam.This first and second protective layer comprises respectively silicon nitride film, silicon oxide film and the alundum (Al film that sets gradually from the surface of this first and second flatness layer.

Description of drawings

Fig. 1 is existing double-side display device;

Fig. 2 is first embodiment of double-side display device of the present invention;

Fig. 3 is second embodiment of double-side display device of the present invention; And

Fig. 4 is the 3rd embodiment of double-side display device of the present invention.

The simple symbol explanation

10 double-side display devices (having now), 221 reflecting electrodes

11 first display floaters, 222 luminescent layers

111 transparency carriers, 223 transparency electrodes

112 first electrodes, 23 protective layers

113 luminescent layers, 24 upper substrates

114 second electrodes, 25 Organic Light Emitting Diodes

115 caps, 251 reflecting electrodes

116 drier, 252 luminescent layers

12 second display floaters, 253 transparency electrodes

121 transparency carriers, 26 protective layers

122 third electrodes, 27 packaging plastics

123 luminescent layers, 30 double-side display devices

124 the 4th electrodes, 32 flatness layers

125 caps, 34 protective layers

126 drier, 342 silicon oxide films

20 double-side display devices, 341 silicon nitride films

21 infrabasal plates, 36 flatness layers

22 Organic Light Emitting Diodes, 38 protective layers

382 silicon oxide films

381 silicon nitride films

39 alundum (Al films

Embodiment

Now cooperate icon that double-side display device of the present invention is described in detail in detail, and enumerate preferred embodiment and be described as follows:

Please refer to Fig. 2, be the structural representation of the first embodiment of the present invention.Double-side display device 20 comprises an infrabasal plate 21 and a upper substrate 24 with a packaging plastic 27 involutions together.The upper surface of infrabasal plate 21 has a transparency electrode 223, a luminescent layer 222 and a reflecting electrode 221 to constitute an Organic Light Emitting Diode 22.The lower surface of upper substrate 24 has a transparency electrode 253, a luminescent layer 252 and a reflecting electrode 251 to constitute another Organic Light Emitting Diode 25.Organic

Light Emitting Diode

22 and 25 is covered by a

protective layer

23 and 26 respectively, and tight involution is in infrabasal plate 21 and upper substrate 24.

Protective layer

23 and 26 function are starvation and steam, therefore should select oxygen and the low material of vapor permeability.More preferably, should make

protective layer

23 and 26 planarizations, can't complete airtight Organic

Light Emitting Diode

22 and 25 with stepped possibly of covering of avoiding last part technology.Therefore, the

protective layer

23 and 26 with a planarized surface can make technologies such as back segment evaporation, deposition carry out more smoothly.Aspect the material of

protective layer

23 and 26, silicon nitride, silica or alundum (Al etc. are possible selection.

Protective layer

23 and 26 is not limited to single layer structure; also can form by a plurality of layer films; for example, with a silicon oxide film and a silicon nitride film, a silicon oxide film and an alundum (Al film, or a silicon nitride film and an alundum (Al film are formed by combining.

It between electrode and the luminescent layer zone of hole or electron transport.In the hole-transfer zone, an alternative hole injection layer or the hole transmission layer of inserting.In the electron transport zone, an alternative electronics hole implanted layer or the electron transfer layer of inserting.

Electron transfer layer can adopt oxine aluminium (Alq), trimerization benzimidazole (TPBI), anthracene (anthracene) derivative, fluorene derivative (fluorine, material such as spirofluorine), more in addition n type alloy such as alkali doped halide, alkaline-earth halide, alkali metal oxide or metal carbonate compound to strengthen its electron mobility.

The material of electron injecting layer can be metallic compound, adopts with good alkali halide, alkaline-earth halide, alkali metal oxide or the metal carbonate compound of light tight electrode work function fitness or comprises the organic layer of said n type alloy.

Hole transport layer material can be NPB, and (N, N-di (naphthalene-1-yl)-N N-diphenyl-benzidene) wait the allyl amine compounds.

The hole injection layer material can be titanium cyanine compounds such as allylic amines or CuPc.

First embodiment is the direct planarization of protective layer, but protective layer also can separate with planarization layer and makes.Please refer to the second embodiment of the invention of Fig. 3.The infrabasal plate 21 of double-side display device 30, upper substrate 24, packaging plastic 27, Organic

Light Emitting Diode

22 and 25 relative position are as described in Figure 2.Different is, second embodiment

protective layer

34 and 38 and Organic

Light Emitting Diode

22 and 25 between import a flatness layer 32 and 36.

Flatness layer

32 and 36 material can be selected a high molecular polymer or inorganic material for use; except avoiding

protective layer

34 and 38 to seal the incomplete problem because of ladder covers; also can solve

protective layer

34 and 38 excessive, cause the low excessively problem of fabrication yield because of internal stress.

The preferred surface slope of the protective layer of above-mentioned planarization or flatness layer should be between positive and negative 60 degree, and lip-deep peak and nadir distance should be less than 5 microns.Also can contain water-repellent substances such as silicon nitride, silica or alundum (Al in the flatness layer.

Please refer to Fig. 4, be the third embodiment of the present invention.The protective layer 34 of the 3rd embodiment can be single silicon oxide film 342, or is made up of a silicon oxide film 342 and a silicon nitride film 341 as icon.Protective layer 38 also can be single silicon oxide film 382, or is made up of a silicon oxide film 382 and a silicon nitride film 381 as icon.Then cover an alundum (Al film 39 at

protective layer

34 and 38 outsides.

In the technology of the 3rd embodiment, at first on substrate 21, form transparency electrode, luminescent layer and reflecting electrode in regular turn to be manufactured with OLED 22, this part-structure please be simultaneously with reference to Fig. 2.Deposition one deck macromolecular compound on Organic Light Emitting Diode 22 again is with as flatness layer 32.On flatness layer 32, form silicon nitride film 341 comprehensively, on silicon nitride film 341, form silicon oxide film 342 more comprehensively.At last, on silicon oxide film 342, form alundum (Al film 39 more comprehensively.

Then, on another substrate 24,, be formed with OLED 25, flatness layer 36, silicon nitride film 381, silicon oxide film 382 and alundum (Al film 39 in regular turn with identical technology.Can connect drive circuit individually on the

substrate

21 or 24, can show two independently video pictures simultaneously in the top and the below of double-side display device 30.At last, coating one deck packaging plastic 27 is combined into double-side display device 30 with two

plate bases

21 and 24 again on substrate 21 or 24.Above-mentioned each layer structure can be made by existing evaporation coating method.Except being necessary to provide photomask carrying out the patterned process being manufactured with OLED 22 processes, all the other are evaporation all comprehensively, therefore can simplify the technology of display with double faces 30.

Among above-mentioned all embodiment, transparency electrode can be tin indium oxide (ITO), indium zinc oxide transparent conductive material or thin metal layers such as (IZO), and transparency carrier can be selected from glass or plastic material substrate.Therefore structure of the present invention is not limited to be applied in passive type display or the active display, can merge with driving element such as thin-film transistor and use.

When the present invention and prior art compare mutually, have more and get row characteristic and advantage ready:

1. preferred waterproof, anti-oxygen performance.

2. easy technology.

Above-listed detailed description specifies at the preferred embodiment of the present invention, and only the foregoing description is not in order to limiting claim of the present invention, does not allly break away from the equivalence that skill spirit of the present invention does and implements or change, all should be contained in the claim of the present invention.

Claims

1. double-side display device comprises:

First substrate;

First Organic Light Emitting Diode is arranged at this first substrate top;

First flatness layer is formed at this first Organic Light Emitting Diode top;

First protective layer covers all surfaces of this first flatness layer, with starvation and steam;

Second substrate is positioned at this first protective layer top;

Second Organic Light Emitting Diode is arranged at this second substrate below;

Second flatness layer is formed at this second Organic Light Emitting Diode below; And

Second protective layer covers all surfaces of this second flatness layer, with starvation and steam;

Wherein, this first and second protective layer comprises respectively silicon nitride film, silicon oxide film and the alundum (Al film that sets gradually from the surface of this first and second flatness layer.

2. double-side display device as claimed in claim 1, wherein this first flatness layer and this second flatness layer all have the surface, and the distance of peak and minimum point is less than 5 microns on this surface.

3. double-side display device as claimed in claim 1, wherein the surface slope of this first flatness layer and this second flatness layer is all between positive and negative 60 degree.

4. double-side display device as claimed in claim 1, wherein this first flatness layer is a high molecular polymer.

5. double-side display device as claimed in claim 1, wherein this second flatness layer is a high molecular polymer.

6. double-side display device as claimed in claim 1, wherein this first flatness layer contains silica.

7. double-side display device as claimed in claim 1, wherein this second flatness layer contains silica.