Display of organic electroluminescence and method for packing thereof
Technical field
The present invention relates to a kind of display of organic electroluminescence and method for packing thereof, particularly relate to a kind of encapsulating structure of display of organic electroluminescence.
Background technology
Display of organic electroluminescence (Organic Electroluminescence Display, OELD, Organic EL Display) claims Organic Light Emitting Diode (Organic Light Emitting Diode again, OLED) display, owing to have the characteristic of high brightness, fast, compact, full-color, the no subtense angle of screen reaction speed and low power consumption, therefore can replace conventional liquid crystal becomes the display unit that portable information product of new generation, mobile phone, personal digital assistant device and portable computer generally use.
The difference of display of organic electroluminescence and LCD maximum is that display of organic electroluminescence is to utilize the source of self-luminous organic luminous layer as display lighting.Please refer to Fig. 1, show an existing Organic Light Emitting Diode 1 (or claiming electro-luminescent display unit), comprise an anode electrode plate 12, a luminescent layer 14 and a cathode electrode plate 16 at least; Wherein, luminescent layer 14 is sandwiched between two battery lead plates 12 and 16, forms (sandwich) structure of one " hamburger ".Under forward voltage drove, anode electrode plate 12 was to luminescent layer 14 injected holes (hole), and cathode electrode plate 16 injects electronics (electron) to luminescent layer 14.The combination of meeting in luminescent layer 14 of injected holes and electronics makes electronics fall back ground state (base state) by excitation state (excited state), and the form radiation (radiation) of excess energy with light wave is disengaged.
On general the application, electro-luminescent display unit 1 can be subjected to the influence of aqueous vapor, and causes following situation: one, aqueous vapor is attached to luminescent layer 14 surfaces easily, and invades in the luminescent layer 14, and causes the luminous intensity of luminescent layer 14 and uniformity of luminance that apparent reduction is arranged; Two, aqueous vapor is invaded the interface of luminescent layer 14 and two battery lead plates, causes luminescent layer 14 to break away from battery lead plate, and produces dim spot (dark spot).Therefore, the present invention designs an airtight encapsulating structure and protects electro-luminescent display unit 1, avoiding the aqueous vapor invasion in the external environment, the normal demonstration of organic luminous layer 14 is exerted an influence.
Please refer to Fig. 2, it is the encapsulating structure 20 of an existing display of organic electroluminescence, and this encapsulating structure 20 comprises an electro-luminescent display unit 1, a glass substrate 22 and a backboard 24; Wherein, electro-luminescent display unit 1 is located at the lower surface of glass substrate 22, and backboard 24 is with sandblast mode or etching mode, and the groove 241 of processing a broadness is surperficial thereon.Simultaneously, glass substrate 22 is fixed on the backboard 24 by sticker 26, and this sticker 26 is around coating these groove 241 peripheries (being backboard 24 edges), making this groove form a confined space, to hold above-mentioned electro-luminescent display unit 1.
Simultaneously, in order to reduce the aqueous vapor of both having deposited in the above-mentioned confined space, and the extraneous aqueous vapor of prevention is infiltrated in this confined space, electro-luminescent display unit 1 is produced injury, one drying layer 28 is set on the 241a of the bottom surface of this groove, and by the middle position of this groove floor 241a, around this groove 241, extend, to absorb the aqueous vapor in the confined space.
Though above-mentioned encapsulating structure 20 can prevent effectively that electro-luminescent display unit 1 from because of contact aqueous vapor deterioration, still having following shortcoming to wait to improve:
One, for to make confined space have enough degree of depth to hold desiccant layer 28, backboard 24 must have enough thickness, is processed to form the required space of groove 241 to provide, thereby causes the thickness of encapsulating structure 20 to reduce.
Two, above-mentioned groove 241 must possess an evenly broad bottom surface 241a, and therefore making groove 241 needs considerable time, thereby improves production cost, and the control of technology also has suitable difficulty; Simultaneously, fragmentation takes place in the intensity of backboard 24 also corresponding reduction easily.
Three, when make displays when the large scale because area increases, above-mentioned glass substrate 22 increases relative with the phenomenon of backboard 24 bendings (bending), and it is even more serious to make that backboard 24 is pressed onto the situation of negative electrode or luminescent layer.
Four, because the thickness of metal electrode can't be made very thickly,, cause panel to be performed poor so its resistance can be very big when large size panel, thereby cause the uneven problem of pressure drop.
In view of this, the present invention proposes a kind of encapsulating structure of high strength display of organic electroluminescence, to solve the shortcoming of above-mentioned existing encapsulating structure.
Summary of the invention
An object of the present invention is to provide a kind of high strength display of organic electroluminescence, its encapsulating structure and method for packing.
Another object of the present invention provides a kind of display of organic electroluminescence, its encapsulating structure and method for packing that can reduce the impedance of organic electro-luminescent display unit negative electrode.
A kind of display of organic electroluminescence provided by the invention comprises a substrate at least; One electro-luminescent display unit is located at this base lower surface; One backboard; And a metal pattern layer, be formed on backboard and the substrate facing surfaces, and contact, with the impedance that reduces negative electrode and strengthen backboard with negative electrode to the small part of electro-luminescent display unit.
The present invention also provides a kind of method for packing of display of organic electroluminescence, comprises at least:
One backboard is provided;
One metal pattern layer is set on this backboard;
Be coated with the periphery of a sticker in this backboard upper surface; And
Paste a substrate on this backboard, wherein the lower surface of this substrate is provided with organic electro-luminescent display unit, and the negative electrode of this organic electro-luminescent display unit contacts with this metal pattern layer to small part.
Description of drawings
Fig. 1 is prior art one organic LED structure figure;
Fig. 2 is the encapsulating structure figure of prior art one display of organic electroluminescence;
Fig. 3 is the encapsulating structure figure of one embodiment of the present invention display of organic electroluminescence;
Fig. 4 A is the backboard epigraph layout layer schematic diagram of one embodiment of the invention;
Fig. 4 B is the backboard epigraph layout layer schematic diagram of another embodiment of the present invention;
Fig. 4 C is the backboard epigraph layout layer schematic diagram of further embodiment of this invention; And
Fig. 4 D is the backboard epigraph layout layer schematic diagram of further embodiment of this invention.
The simple symbol explanation
1 electro-luminescent display unit, 12 anode electrode plates
14 luminescent layers, 16 cathode electrode plates
241 backboard upper surface groove 241a groove floor
36 metal pattern layer, 20,30 display encapsulating structures
22,32 substrates, 24,34 backboards
26,37 stickers, 28,38 drier
Embodiment
Please refer to Fig. 3, be the schematic diagram of preferred embodiment of the encapsulating structure 30 of the display of organic electroluminescence that illustrates according to the present invention, this encapsulating structure 30 comprises an electro-luminescent display unit 1, a metal pattern layer 36, a drier 38, a substrate 32 and a backboard 34.Substrate 32 and the backboard 34 all flat board of available translucent material are made, and will be that example is explained as substrate 32 and backboard 34 with glass in the following description.
Electro-luminescent display unit 1 is positioned at the lower surface of glass substrate 32, metal pattern layer 36, drier 38 is positioned at the upper surface of glass back plate 34, and drier 38 is positioned at the space of metal pattern layer 36 or in (between metal pattern layer 36 and sticker 37) around the glass back plate 34, glass substrate 32 is fixed on the glass back plate 34 by sticker 37, sticker 37 is around coating glass back plate 34 edges (glass back plate 34 peripheries), make glass substrate 32, glass back plate 34, sticker 37 forms a confined space, to hold above-mentioned electro-luminescent display unit 1, drier 38 and metal pattern layer 36.
Please refer to shown in the figure four, in the present invention, the metal pattern layer on the backboard can be made into linear (Fig. 4 A), latticed (Fig. 4 B), columnar arrays (Fig. 4 C) and film patterns such as (Fig. 4 D).When metal pattern layer is linear, latticed, columnar arrays, be applicable to that display element is two-way luminous or unidirection luminous; When being metallic film, be applicable to that then display element is unidirection luminous and is the pattern through glass substrate upwards luminous (Bottom Emission).
The present invention uses metal pattern layer to have the following advantages:
One, metal pattern layer contacts with the negative electrode of display element, because metallic conductivity is good, can be the extension of metal pattern layer as the display element negative electrode, integral body can be considered as increasing the sectional area (promptly being equal to increases cathode thickness) of negative electrode, so can lower the electro-luminescent display unit cathode impedance, improve the problem of pressure drop, make the performance of display homogeneity preferred.
Two, metal pattern layer can increase display device structure intensity, as the reinforced structure (Spacer) of display, and glass substrate and glass back plate bending (bending) phenomenon is made moderate progress.Because metal pattern layer contacts with display element, makes between glass substrate and the glass back plate to be unlikely to unsettled, in addition, utilize the words of this framework, glass back plate just not necessarily needs processing and manufacturing one groove to hold drier, so the intensity of glass back plate can not lower, also lowers its production cost.
If three, when metal pattern layer linear, latticed or columnar arrays, can be used as the light shield layer (Black Matrix) of display element, can cover pixel openings light source in addition, promote color contrast, prevent the mutual colour mixture of redness, green and blue pixel of adjacency.The position that need consider its pixel (Pixel) circuit when design is a criterion not influence aperture ratio of pixels.
Generally speaking, the control circuit of electro-luminescent display unit and other element all are made in the lower surface of glass substrate, therefore, if electro-luminescent display unit can improve the aperture opening ratio of electro-luminescent display unit for seeing through the pattern of glass back plate luminous (TopEmission) downwards; The design of complexed metal patterned layer again can reach the lifting contrast, increases display device structure intensity, lowers the electro-luminescent display unit cathode impedance, improve the problem of pressure drop, and make the display homogeneity show advantages such as preferred.
The above is to utilize preferred embodiment to describe the present invention in detail, its purpose makes those skilled in the art can better understand content of the present invention and is implementing according to this, but not be used for limiting the scope of the invention, for those of ordinary skill in the art under the prerequisite that does not break away from spirit of the present invention and category, any equivalent modifications or change to the present invention carries out all should be included in the claim of the present invention.