WO2010038180A2

WO2010038180A2 - Passive matrix display

Info

Publication number: WO2010038180A2
Application number: PCT/IB2009/054202
Authority: WO
Inventors: Dirk Hente; Joseph H. A. M. Jacobs
Original assignee: Philips Intellectual Property and Standards GmbH; Koninklijke Philips Electronics NV
Current assignee: Philips Intellectual Property and Standards GmbH; Koninklijke Philips NV
Priority date: 2008-10-01
Filing date: 2009-09-25
Publication date: 2010-04-08
Anticipated expiration: 2011-04-01
Also published as: WO2010038180A3

Abstract

The invention relates to a passive matrix display (10,10') for displaying at least one predetermined sign (15,15'), comprising a carrier element (20) and a cover element (30), a plurality of elongated and generally parallel arranged conductive first strip- elements (21) and second strip-elements (31), a plurality of pixel elements (40), wherein the first strip-elements (21) and the second strip-elements (31) form a grid like structure (50), wherein the pixel elements (40) are connected to the grid like structure (50) and wherein the pixel elements (40) are only applied to those crossings of the first strip- elements (21) and the second strip-elements (31), necessary to form the at least one predetermined sign (15,15').

Description

PASSIVE MATRIX DISPLAY

FIELD OF THE INVENTION

This invention relates to a passive matrix display. Furthermore, the invention relates to a method for assembling a passive matrix display.

BACKGROUND OF THE INVENTION

In the EP 1 814 185 A2 an organic light emitting display is described. The display comprises elongated stripes of anode arranged generally perpendicular to elongated stripes of cathode with an organic layer interposed there between. The intersection of the stripes of cathode and anode define individual pixels, where light is generated and emitted upon appropriate excitation of the corresponding stripes of anode and cathode. In modern advertisement huge luminous letters and/or symbols are used, which have typically a size of a few square meters. Such signs are too big to be realized by standard sized displays. Known large area displays on the other hand are too expensive and have enormous energy consumption. The display described above in the european patent application has the drawback, that a huge amount of organic material is needed to cover the whole area of the light emitting display. Furthermore, such huge advertisement displays are only used to display predetermined signs. Therefore, only very few parts of the organic material are actually used to generate artificial light. The remaining part of the organic material is not used.

SUMMARY OF THE INVENTION

Thus, the invention has for its object to eliminate the above mentioned disadvantages. In particular, it is an object of the invention to provide a passive matrix display for displaying at least one predetermined sign, which uses a reduced amount of energy compared to the mentioned prior art. This object is achieved by a passive matrix display as taught by claim 1 of the present invention. Also the object is achieved by a first method for assembling a passive matrix display for displaying at least one predetermined sign as taught by claim 11 of the present invention. Furthermore, the object is achieved by a second method for assembling a passive matrix display as taught by claim 12 of the present invention. Advantage embodiments of the passive matrix display and the methods are defined in the sub claims. Features and details described with respect to the passive matrix display also apply to the methods and vice versa.

This invention discloses a passive matrix display for displaying at least one predetermined sign, comprising a carrier element and a cover element, a plurality of elongated and generally parallel arranged conductive first strip-elements and second strip- elements, a plurality of pixel elements, wherein the first strip-elements and the second strip-elements form a grid like structure, wherein the pixel elements are connected to the grid like structure and wherein the pixel elements are only applied to those crossings of the first strip-elements and the second strip-elements, necessary to form the at least one predetermined sign.

The leading idea of the present invention is to apply pixel elements only to those positions, needed to form the at least one predetermined sign. The display disclosed in the invention has a reduced energy consumption to the prior art.

In a preferred embodiment of the passive matrix display, the pixel element is an OLED element, wherein in each OLED element a cathode means, an organic means and an anode means form a multilayer structure. Thus, the passive matrix display does not use a single sheet like organic layer, which is positioned between an anode and a cathode. Rather than that, individual pixel elements and/or OLED elements are used. Each of the pixel elements and/or OLED is able to emit artificial light, if electrical power is applied. In an alternative embodiment, the pixel element comprises at least one of the following: an electroluminescence device, a light-emitting diode (LED) or an array of LEDs.

In a preferred embodiment of the passive matrix display, the first strip- elements are arranged generally perpendicular to the second strip-elements with the pixel elements interposed there between. This arrangement has the advantage, that the carrier element and the cover element may possess the same configuration. Furthermore, there is no need to electrically isolate the first and second strip elements from each other, as the pixel elements keep the first and second strip elements at bay. If a huge display is needed to depict a predetermined sign, a carrier element may be taken, which possesses a plurality of first strip-elements. Onto this carrier element and onto the first strip-elements pixel elements are attached. These pixel elements are arranged in such a way that they form the predetermined sign. In areas of the carrier element, which are not needed to display the predetermined sign no pixel elements will be attached. Onto this assembly the cover element is attached. In the described embodiment, the configuration of the carrier element and the cover element may be equal, only rotated by 90°. Thus, the first strip-elements and second strip-elements form a grid like structure, between which the pixel elements are interposed. By the usage of a carrier element and a cover element with the same configuration a very easy assembly of the disclosed passive matrix display is possible.

In another embodiment the first strip-elements are arranged generally perpendicular to the second strip-elements, wherein the first strip-elements are overlayed by the second strip-elements to form the grid like structure. The crossing points of the first and second strip elements are electrically isolated from each other. Furthermore, the remaining parts of the first and second strip elements do not have to be electrically isolated from each other. In this embodiment the grid like structure is formed before the pixel elements are attached there onto. Therefore, at first the first strip-elements are applied to the carrier element followed by the mounting of the second strip-elements onto the first strip-elements. Thus, a grid like structure is formed. The pixel elements are attached for example at the crossing points of the first and second strip-element. Again, pixel elements are solely attached to those crossings of the grid like structure, which are needed to form the predetermined sign.

The origins of the light - in the following also referred to as artificial light - emitted by the passive matrix display are the pixel elements. In one embodiment, the pixel elements are OLED elements, comprising a multilayer structure. Normally a anode means is formed by a thin layer of a transparent conductive material like indium tin oxide (ITO). Furthermore, the OLED element consists of at least one thin layer with a layer thickness of approximately 5 to 500 nm of organic substances. The organic means is regularly covered with a layer of metal, like aluminum, forming the cathode means, whereas the metal layer features a thickness of approximately 100 nm and a thickness like to ITO-layer. In the context of the invention, the term organic means comprises a single layer of an organic material as well as an element, build of several layers, and comprises organic and inorganic material. The OLED element can be categorized based on the direction of the light emission. In one embodiment referred to as "top emission" type, the pixel element emits light through the cathode means. In this arrangement, the cathode means is made of a material transparent or at least partially transparent with respect to the visible and/or artificial light generated by the organic means. To increase the output of the artificial light generated by the OLED element, the anode means may be made of a material substantially reflective of the visible and/or artificial light. A second embodiment of the OLED element emits light through the anode means and is called "bottom emission" type. In the bottom emission type, the anode means is made of a material, which is at least partially transparent with respect to visible and/or artificial light. Often, in bottom emission type OLED elements the cathode means is made of a material substantially reflective of the visible and/or artificial light. A third type of OLED elements is able to emit light through the cathode means as well as through the anode means. Therefore, the cathode and anode means are made of a material, which is at least partially transparent with respect to the visible and/or artificial light generated by the organic means.

In another preferred embodiment the cover element is transparent. Transparent in the context of the present invention means that the light emitted by the pixel element and/or OLED element can travel through the cover element with no or just minor attenuation. As the light emitted by the pixel element and/or OLED element may be in the visible range between 400 to 800 nm, the cover element may also be transparent for ambient light falling onto the passive matrix display. In an additional embodiment, the cover element may be laminated onto the carrier element. By using a heat activated film, the cover element is adhered to the carrier element. Such a connection of the cover element and the carrier element can easily be done, so that the passive matrix display can even be build in a copy shop etc., where a customer wants to buy an customized display.

Depending on the type of pixel element and/or OLED element used, it has been appropriate that at least one of the following elements comprises a transparent and/or flexible material: The carrier element, a cover element, at least one of the pixel elements, at least on of the first strip-elements or at least one of the second strip-elements.

The pixel element and/or OLED element can suffer damage or deterioration from exposure to water, oxygen or other harmful gases. Therefore, the pixel elements and/or OLED elements are sealed or laminated or encapsulated to inhibit the exposure to moisture and/or other harmful gases. Using to thin films to embed the pixel element and laminate the two films together, one achieves a pixel element, which is protected from environmental impacts. The laminating of a multilayer structure can easily be done, is price worthy and stable.

In another advantageous embodiment the pixel element comprises a first connection means and a second connection means, wherein the first connection means is designed to enable a connection of the first strip-element to the pixel element and wherein the second connection means is designed to enable a connection of the second strip- element to the pixel element. The first and second strip-elements are used to deliver electrical power to the pixel elements. Therefore, they are made of a conductive material. Obviously the said is also true, if an OLED element is used as a pixel element. The first and second connection means may be formed by conductive bridges, wherein the first connection means is bond on the one hand to the cathode means and on the other hand to the first strip-element. Additionally, the second connection means is also formed as a connective bond, connecting the anode means and the second strip-element. This conductive bridge like first and second connection means may be glued to the first and second strip-element with an electrically conductive adhesive. Such an electrically conductive adhesive may be achieved by an organic matrix (like an epoxy- or silicon adhesive) in which conductive metal flakes are embedded. In an alternative embodiment, the bridge like first and second connection means may be connected with the first and second strip-element by heat. To prevent any damage of the organic means, the bond may possess a length, which ensures, that the heat applied to the first and second connection means will be attenuated before reaching the organic means.

In another embodiment the enclosure in which the pixel element is embedded is some kind of encapsulation. Then the first and second connection means may be formed by recesses in the encapsulation. Therefore, a direct connection of the pixel element with the first and/or second strip-element is possible. In this case, the first and/or second connection means may be an electrically conductive adhesive.lt is also possible, that the first and/or second connection means are formed by conductive pins. Those conductive pins may be positioned onto the grid like structure. These pins not only connect the pixel element with the first and/or second strip-element, but are also helpful for the positioning of the pixel elements. An electrically conductive adhesive may be used to connect the pixel elements and the pin-like first and/or second connection means.

In another embodiment, the first and/or second connection means are formed by magnets. These magnetic first and/or second connection means may be connected to the pixel element and allow a connection of the pixel elements to the first and/or second strip-element by magnetic force. The first and/or second strip-element may not be insulated at those positions, at which the pixel elements are to be applied. Therefore the pixel elements may only be positioned to the grid like structure according to a predetermined pattern. Those magnets may also be positioned in the recesses of the encapsulation of the pixel elements. In a further preferred embodiment the passive matrix display comprises at least one first driver element and one second driver element. The at least one first driver element is connected to at least one first strip-element. The at least one second driver element is connected to at least one strip-element. As has been mentioned before, the first and second strip-element comprise a conductive material - preferably a metal -, which is needed to transport the electrical current form an outside power source to the pixel element. The first and second driver element may be part of this external power source. Therefore, it is needed, that the first/second strip-element is connected to the first/second driver element. To illuminate the predetermined sign and/or parts of it each pixel element may be addressed individually. This can be done by applying electrical powers to predetermined first and second strip-elements. In a further preferred embodiment a plurality of first strip-elements are grouped together in a first group. Furthermore, a plurality of second strip-elements may be merged in a second group. By connecting the first group to the first driver element not just individual pixel elements are addressed and powered, but a whole group of pixel elements. This group may form the predetermined sign. As a result of this, the driving current needed to achieve a relatively high brightness is reduced, compared to individual addressing of the pixel elements. This saves costs and energy.

The above mentioned object of the present invention is also solved by a method for assembling a passive matrix display for displaying at least one predetermined sign, with a carrier element, wherein the carrier element comprises a plurality of elongated and generally parallel arranged conductive first strip-elements, a cover element, wherein the cover element comprises a plurality of elongated and generally parallel arranged conductive second strip-elements, a plurality of pixel elements, the method comprising the following steps:

Connecting only those pixel elements with the first strip-elements necessary to form the at least one predetermined sign,

Superimposing the cover element onto the carrier element in such a way, that the first strip-elements and the second strip-elements form a grid like structure, wherein the pixel elements are interposed there between, Connecting only those pixel elements with the second strip-elements necessary to form the at least one predetermined sign.

Additionally, the object mentioned above is also solved by a method for assembling a passive matrix display for displaying at least one predetermined sign, with a carrier element and a cover element, a plurality of elongated and generally parallel arranged conductive first strip-elements and second strip-elements, a plurality of pixel elements, wherein the first strip-elements and the second strip-elements form a grid like structure onto the carrier element, the method comprising the following step:

Linking of the pixel elements only to those crossings of the first strip- elements and the second strip-elements necessary to form the at least one predetermined sign,

Covering the carrier element and pixel elements at least partially with the cover element.

Obviously, in both methods, the described pixel element may be formed by at least one of the following light sources: an OLED element, a LED (light emitting diode) or an electroluminescence device. Features and details described with respect to the passive matrix display also apply to both methods.

In the context of the two disclosed methods, the terms "Linking" and/or "Connecting" refer to a junction between the pixel elements and one or both of the strip- elements. As has been disclose above, this junction may be formed by the first and/or second connection means. Those first and/or second connection means the may be an electrically conductive adhesive. It is also possible, that the first and/or second connection means are formed by conductive pins. Those conductive pins may be positioned onto the grid like structure. An electrically conductive adhesive may be used for "Linking" and/or "Connecting" the pixel elements and the pin- like first and/or second connection means. In another advantage step for both methods, the first strip-elements and/or second strip-elements are printed onto the carrier element and/or the cover element. Such printing can easily be done in copy shops etc. Therefore the method for assembling a passive matrix display enables a lot of businesses to form passive matrix display for displaying at least one predetermined sign, as described above. The aforementioned passive matrix display and/or methods for assembling, as well as claimed components and the components to be used in accordance with the invention in the described embodiments are not subject to any special exceptions with respect to size, shape, material selection. Technical concepts such that the selection criteria are known in the pertinent field can be applied without limitations. Additional details, characteristics and advantages of the object of the present invention are disclosed in the subclaims and the following description of the respective figures - which are an exemplary fashion only - showing a plurality of preferred embodiments of the passive matrix display according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Further embodiments of the invention will be described with respect to the following figures, which show: Fig. 1 a first embodiment of a passive matrix display,

Fig. 2 a pixel element,

Fig. 3 a second embodiment of a passive matrix display,

Fig. 4 a possible driving schema for the disclosed passive matrix display and Fig. 5 a second driving schema for the passive matrix display

DETAILED DESCRIPTION OF EMBODIMENTS

Figure 1 shows a passive matrix display 10 according to the present invention. The passive matrix display 10 - in the following also labeled as display 10 - is used to display at least one predetermined sign 15. The display 10 comprises a carrier element 20 and a cover element 30. The carrier element 20 and the cover element 30 are made of a transparent and flexible material like a polymer. Arranged onto the carrier element 20 is a plurality of elongated and generally parallel arranged conductive first strip- elements 21. Onto these first strip-elements 21 a plurality of pixel elements 40 are arranged. In the all shown embodiments, the pixel element 40 is an OLED element. This should not be seen as a limitation, but just a way to explain the invention. Therefore, the in the following, pixel element 40 and OLED element 49 may be used as a synonym. In the shown embodiment, the first 21 and second strip elements 21 are not electrically isolated from each other, as the pixel elements 40 keep the first 21 and second strip elements 21 at bay from each other.

The OLED element 49 is formed by a multilayer structure, which will be described in the following. The pixel elements 40 and/or OLED elements 49 are able to emit light 90 if an electrical current is applied. Therefore, the cover element 30 possesses also a plurality of elongated and generally parallel arranged conductive second strip- elements 31. The first strip-elements 21 and the second strip-elements 31 in figure 1 are arranged generally perpendicular to each other, forming a grid like structure 50. The pixel elements 40 and/or OLED elements 49 are interposed between the first strip-elements 21 and the second strip-elements 31. The first strip-elements 21 as well as the second strip- elements 31 are used to deliver an electrical current to the pixel elements 40. Therefore, the first respectively second strip-elements 21, 31 have to be conductive.

In the shown embodiment the pixel element 40 and/or OLED element 49 is able to emit light 90 through a bottom face and a top face. Therefore, it is appropriate, that also the cover element 30 and the carrier element 20 are transparent. As shown, the artificial light 90 leaves the display 10 through a top surface 11 as well as through a bottom surface 12. To reduce possible absorption and attenuation of the artificial light 90 it is advantageous, if the first strip-elements 21 and/or the second strip-elements 31 are also transparent. To achieve this aim, the first and/or second strip-element 21, 31 may comprise conductive polymeric materials, transparent conductive oxides or metals. The described display 10 has a major advantage compared to the prior art. The pixel elements 40 are only attached to those places on the grid like structure 50 of the carrier element 20, which are needed to form the at least one predetermined sign. Furthermore, each of the pixel elements 40 is an individual device sealed or encapsulated to inhibit exposure to environmental impacts. Obviously, the described OLED elements 49 may be replaced by pixel elements 40, having other technical layout, like LED (light emitting diodes) or electroluminescence devices.

In figure 2 an example for a pixel element 40 is shown. In the depicted example, the pixel element 40 is an OLED element 49. As can be seen, the OLED element 49 comprises three different layers, which form a multilayer structure 44. The bottom layer is formed by an anode means 41. Onto this anode means 41 an organic means 42 is superimposed. The multilayer structure 44 is completed by a cathode means 43 and a substrate layer 85. To connect the pixel element 40 and/or the OLED element 49 to the first strip-element 21 respectively to the second strip-element 31, each of the pixel elements 40 and/or the OLED element 49 comprises a first connection means 60 and a second connection means 65. In the shown embodiment the multilayer structure 44 is embedded in an encapsulation 45. This encapsulation 45 may be formed by two thin films, which are laminated together with the pixel element 40 interposed there between. To connect the pixel element 40 and/or the OLED element 49 to the grid like structure 50 the encapsulation 45 comprises at a side face the first connection means 60. This first connection means 60 is a recess, enabling the direct contact of the anode means 41 with the first strip-element 21. In the upper side of the encapsulation 45 the second connection means 65 is arranged. Also this second connection means 65 is formed by a recess, enabling the second strip-element 31 to be connected with the cathode means 43.

The substrate layer 85 is preferably glass but may also be a flexible substrate such as polymers. Thus, the substrate layer 85 may comprise one of the following materials: polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or high temperature polymers such as polyether sulfone (PES), polyimides (PI, Kapton Dupon), or Transphan; metal; paper; fabric; and combinations thereof. The substrate layer 85 may also comprise a rigid material like: ceramics, metals, or semiconductors .The type of material being used depends on the desired rigidity, peel and adhesion properties, temperature resistance, UV-blocking, transparency, resistance with respect to flexibility, water and oxygen barrier properties.

A suitable material for the transparent first strip-element 21 and/or second strip-element 31 and/or cathode means 43 and/or anode means 41 may include conductive polymeric materials, transparent conductive oxides (TCOs) and metals. Furthermore the first strip-element 21 and/or the second strip-element 31 and/or the cathode means 43 and/or anode means 41 may comprise indium-tin-oxide (ITO), zinc-indium-oxide (ZIO), aluminum-doped ZnO, Ga- In-Sn-O (GITO), SnO2, Zn-In-Sn-O (ZITO), and Ga-In-O (GIO). Suitable metals include gold (Au), silver (Ag), aluminum (Al), iridium (Ir), nickel (Ni) and chromium (Cr). Instead of using a transparent layer also a fine, almost invisible layer of metal lines may be used to form the first and/or second strip-elements 21 , 31. In this case methods like printing or lamination can be used to realize the grid-like 50 structures. The contacting between first and/or second strip-elements 21, 31 and the pixel elements 40 may be done via electrical conductive adhesive, ultrasonic welding etc.

An aim achieved by the present invention is to reduce the amount of needed electrical power for a display. Therefore, it is disclosed, that only those parts of the passive matrix display 10' are covered with pixel elements 40, which are needed to display a predetermined sign 15. In figure 3 the predetermined signs 15 are the two letters "Fi". Those two signs 15, 15' shall be displayed by the display 10'. The display 10' comprises the carrier element 20 onto which a plurality of elongated and generally parallel arranged conductive first strip-elements 21 are applied. In contrast to the embodiment of the passive matrix display 10 shown in figure 1 also the second strip-elements 31 are applied to the carrier element 20. Those second strip-elements 31 are arranged generally perpendicular to the first strip-elements 21, forming a grid like structure 50. The crossing points of the first 21 and second strip elements 31 are electrically isolated from each other. In the shown embodiment, the remaining parts of the first 21 and second strip elements 21 are not electrically isolated from each other. Onto this grid like structure 50 a plurality of pixel elements 40 are applied. The pixel elements 40 are only applied to those crossing of the first strip-elements 21 and the second strip-elements 31, necessary to form the at least one predetermined sign 15, 15'. To all other crossing points - not necessary to form the predetermined sign 15, 15' - no pixel elements 40 are applied. Obviously, the described pixel element 40 may be formed by OLED element 49, a LED (light emitting diodes) or an electroluminescence device.

To drive the different pixel elements 40 of the passive matrix display 10 different schemata are possible. First of all every single first strip-element 21 and second strip-element 31 may comprise its own driving element. Therefore, it is possible to drive each of the first respectively second strip-elements 21, 31 individually. Another possible scheme is shown in figure 4. Here the first strip-elements 21 are all connected to one first driver element 70. Also all second strip-elements 31 are connected to one second driver element 75. Therefore, a steering element controlling the organic luminescent display 10' has just to steer the first and second driver element 70, 75. In figure 5 another embodiment of a possible scheme is shown. To increase the on time per pixel element 40 one can form groups of pixel elements 40. This is done by connecting a plurality of first strip- elements 21 to a first group, which is connected to its own first driver element 70. The same may apply to a plurality of second strip-elements 31, which are combined to a second group. In figure 6 two second groups are formed. Each of the group presents one of the signs 15, 15', which should be displayed by the display 10. It therefore needs just two second driver elements 75, 75' to individually drive the signs 15, 15' of the disclosed display 10. Obviously, the described pixel elements 40 may be formed by OLED element 49, a LED (light emitting diodes) or an electroluminescence device. LIST OF NUMERALS:

10, 10' passive matrix display

11 top surface

12 bottom surface

15, 15' predetermined sign

20 carrier element

21 first strip-element

30 cover element,

31 second strip-element

40 pixel element

41 anode means

42 organic means

43 cathode means

44 multilayer structure

45 encapsulation

49 OLED element

50 grid like structure

60 first connection means

65 second connection means

70 first driver element

75 second driver element

85 substrate layer

90 artificial light

Claims

CLAIMS:

1. Passive matrix display (10,10') for displaying at least one predetermined sign (15,15'), comprising a carrier element (20) and a cover element (30), a plurality of elongated and generally parallel arranged conductive first strip- elements (21) and second strip-elements (31), a plurality of pixel elements (40), wherein the first strip-elements (21) and the second strip-elements (31) form a grid like structure (50), wherein the pixel elements (40) are connected to the grid like structure (50) and wherein the pixel elements (40) are only applied to those crossings of the first strip- elements (21) and the second strip-elements (31), necessary to form the at least one predetermined sign (15,15').

2. Passive matrix display (10,10') according to claim 1, characterized in that the pixel element (40) is an OLED element (49), wherein in each OLED element (49) a cathode means, an organic means and an anode means form a multilayer structure (44).

3. Passive matrix display (10,10') according to claim 1, characterized in that the pixel element (40) comprises at least one of the following light sources: an electroluminescence device, a light-emitting diode (LED) or an array of LEDs.

4. Passive matrix display (10,10') according to any claims 1 to 3, characterized in that the first strip-elements (21) are arranged generally perpendicular to the second strip-elements (31) with the pixel elements (40) interposed there between.

5. Passive matrix display (10,10') according to any claims 1 to 3, characterized in that the first strip-elements (21) are arranged generally perpendicular to the second strip-elements (31), wherein the first strip-elements (21) are overlayed by the second strip-elements (31) to form the grid like structure (50) with electrically isolated crossings and with the pixel elements (40) attached to the grid like structure.

6. Passive matrix display (10,10') according to any preceding claims, characterized in that the cover element (30) is transparent and/or is laminated onto the carrier element (20).

7. Passive matrix display (10,10') according to any preceding claims, characterized in that at least one of the following elements comprise a transparent and/or flexible material: the carrier element (20), the cover element (30), at least one of the pixel elements (40), at least one of the first strip-elements (21) or at least one of the second strip-elements (31).

8. Passive matrix display (10,10') according to any preceding claims, characterized in that the pixel element (40) comprises a first connection means (60) and a second connection means (65), wherein the first connection means (60) is designed to enable a connection of the first strip-element (21) to the pixel element

(40) and wherein the second connection means (65) is designed to enable a connection of the second strip-element (31) to the pixel element (40).

9. Passive matrix display (10,10') according to any preceding claims, characterized in that the passive matrix display (10,10') comprises at least one first driver element (70) and at least one second driver element (75), wherein the at least one first driver element (70) is connected to at least one first strip-element (21) and the at least one second driver element (75) is connected to at least one second strip- element (31).

10. Passive matrix display (10,10') according claim 9, characterized in that a first group of first strip-element (21) is connected with the first driver element (70) and/or that a second group of second strip-element (31) is connected with the second driver element (75).

11. Method for assembling a passive matrix display (10,10') for displaying at least one predetermined sign (15,15'), with a carrier element (20), wherein the carrier element (20) comprises a plurality of elongated and generally parallel arranged conductive first strip-elements (21), a cover element (30), wherein the cover element (30) comprises a plurality of elongated and generally parallel arranged conductive second strip-elements (31), a plurality of pixel elements (40), the method comprising the following steps:

Connecting only those pixel elements (40) with the first strip-elements (21) necessary to form the at least one predetermined sign (15,15'), - Superimposing the cover element (30) onto the carrier element (20) in such a way, that the first strip-elements (21) and the second strip- elements (31) form a grid like structure (50), wherein the pixel elements (40) are interposed there between,

Connecting only those pixel elements (40) with the second strip- elements (31) necessary to form the at least one predetermined sign

(15,15').

12. Method for assembling a passive matrix display (10,10') for displaying at least one predetermined sign (15,15'), with a carrier element (20) and a cover element (30), a plurality of elongated and generally parallel arranged conductive first strip-elements (21) and second strip- elements (31), a plurality of pixel elements (40), wherein the first strip-elements (21) and the second strip-elements (31) form a grid like structure (50) onto the carrier element (20), the method comprising the following steps:

Linking of the pixel elements (40) only to those crossings of the first strip-elements (21) and the second strip-elements (31) necessary to form the at least one predetermined sign (15,15'), Covering the carrier element (20) and pixel elements (40) at least partially with the cover element (30).

13. Method according to claim 11 or 12, characterized in that the first strip-elements (21) and/or the second strip-elements (31) are printed onto the carrier element (20) and/or the cover element (30).

14. Passive matrix display (10,10') according to any claims 1 to 10, characterized in that the passive matrix display (10,10') is assembled in accordance with a method according to any claims 11 to 13.