Light-emitting device with alternating arrangement of anode pads and cathode pads
The invention relates to a light-emitting device like an OLED comprising a light emission region between an anode ( 5 ) and a cathode ( 6 ). An alternating arrangement ( 9 ) of anode pads ( 11 ) for electrically connecting the anode and cathode pads ( 10 ) for electrically connecting the cathode and an encapsulation ( 8 ) are configured such that the anode and cathode pads are electrically connectable by straight anode and cathode electrical connectors ( 3, 4 ) through openings ( 12 ) of the encapsulation. The alternating arrangement of the anode and cathode pads can lead to a more homogenous electrical field between the anode and the cathode and therefore allows for an improved degree of homogeneity of light emission. More, since the alternating arrangement of the anode and cathode pads is connectable by corresponding straight connectors, the contacting of the pads can be performed technically relatively easily.
1. A light-emitting device comprising a light emission source between a substrate and a thin-film encapsulation,
wherein the light emission source comprises a light emission region between an anode and a cathode, the light emission region being adapted to emit light if a voltage is applied between the anode and the cathode, the light emission source further comprising an alternating arrangement of anode pads for electrically connecting the anode and cathode pads for electrically connecting the cathode, the alternating arrangement of anode and cathode pads being supported by the substrate,
wherein the thin-film encapsulation overlies the anode and cathode pads and comprises openings for accessing the alternating arrangement of anode and cathode pads from outside the thin-film encapsulation,
wherein the light-emitting device further comprises an anode electrical connector for electrically interconnecting the anode pads through the openings of the thin-film encapsulation over the anode pads and for electrically connecting the anode pads to a voltage source, and a cathode electrical connector for electrically interconnecting the cathode pads through the openings of the thin-film encapsulation over the cathode pads and for electrically connecting the cathode pads to the voltage source,
wherein the alternating arrangement of anode and cathode pads, the thin-film encapsulation, the anode electrical connector and the cathode electrical connector are configured such that the anode pads are electrically connected by a straight part of the anode electrical connector and the cathode pads are electrically connected by a straight part of the cathode electrical connector, the straight parts of the anode and cathode electrical connectors being metal stripes that have been deposited on the thin-film encapsulation, and
wherein the alternating arrangement of anode and cathode pads, the thin-film encapsulation, the anode electrical connector and the cathode electrical connector are further configured such that the thin-film encapsulation electrically insulates the anode pads from the overlying straight part of the cathode electrical connector and electrically insulates the cathode pads from the overlying straight part of the anode electrical connector.
2. The light-emitting device as defined in claim 1 , wherein the light emission source comprises several sides, and wherein the alternating arrangement of anode and cathode pads is located at one side of the light emission source only.
3. The light-emitting device as defined in claim 1 , wherein an insulator is arranged in regions connecting the anode pads with the anode for electrically insulating these regions from the cathode.
4. The light-emitting device as defined in claim 1 , wherein the light-emitting device is an organic light-emitting device.
5. The light-emitting device of claim 1 wherein the alternating arrangement of anode and cathode pads are on one side of a face of the light-emitting device, wherein the anode extends to remaining sides of the face of the light-emitting device, and wherein the anode electrical connector is further electrically connected to metal stripes deposited on the anode along the remaining sides of the light-emitting device.
6. A production method for producing a light-emitting device, wherein the production method comprises the steps of:
providing a substrate,
providing a light emission source on a substrate, wherein the light emission source comprises a light emission region between an anode and a cathode, the light emission region being adapted to emit light if a voltage is applied between the anode and the cathode, the light emission source further comprising an alternating arrangement of anode pads for electrically connecting the anode and cathode pads for electrically connecting the cathode, the alternating arrangement of anode and cathode pads being supported by the substrate,
depositing the thin-film encapsulation on the light emission source,
providing openings in the thin-film encapsulation for accessing the alternating arrangement of anode and cathode pads from outside the thin-film encapsulation,
depositing a first metal stripe as a straight part of an anode electrical connector on the thin-film encapsulation to electrically interconnect the anode pads through the openings of the thin-film encapsulation over the anode pads for electrically connecting the anode pads to a voltage source,
depositing a second metal stripe as a straight part of a cathode electrical connector on the thin-film encapsulation to electrically interconnect the cathode pads through the openings of the thin-film encapsulation over the cathode pads for electrically connecting the cathode pads to the voltage source,
wherein the thin-film encapsulation electrically insulates the anode pads from the overlying straight part of the cathode electrical connector and electrically insulates the cathode pads from the overlying straight part of the anode electrical connector.