Display device and manufacturing method thereof
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsJunya Maruyama, Shunpei Yamazaki
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Abstract
In a display device using an organic light emitting diode (OLED), the occurrence of a dark spot and peeling of a cathode due to moisture are suppressed. An outer edge portion of a sealing substrate (second substrate) (102) is made to have a convex shape and a gap between the sealing substrate and an element substrate are controlled by means of this convex region. Thus, since it is not required that a layer (106) having adhesion for bonding together the sealing substrate and the element substrate has a function for controlling the gap, the thickness of the layer can be minimized. Therefore, the amount of moisture which is transmitted through the layer (having adhesion) made of an organic material and penetrated in a sealed region can be reduced.
Claims48
A display device comprising:
- a first substrate;
- an organic light emitting element over the first substrate;
- and
- a second substrate which is translucent, the second substrate bonded to the first substrate through a layer having adhesion,
- wherein a surface of the second substrate opposing the first substrate comprises a first thickness at a first region and a second thickness at a second region, the first region is adhered with the layer having adhesion, and the second region is located inside the first region and concaved relative to the first region.
A display device comprising;
- a first substrate;
- an organic light emitting element over the first substrate;
- and
- a second substrate which is translucent, the second substrate bonded to the first substrate through a layer having adhesion,
- wherein a surface of the second substrate opposing the first substrate comprises a first region, a second region, and a third region, the first region is adhered with the layer having adhesion, the second region is located inside the first region and concaved relative to the first region, the third region is located inside the second region and concaved relative to the second region, and
- wherein a dry agent is provided in the third region.
A display device comprising:
- a first substrate;
- an organic light emitting element over the first substrate:
- a layer having adhesion for enclosing with a gap an area surrounding a region in which the organic light emitting element is provided on the first substrate;
- and
- a second substrate which is translucent, the second substrate bonded to the first substrate through the layer having adhesion,
- wherein a surface of the second substrate opposing the first substrate comprises a first region, a second region, and a third region, the first region is adhered with the layer having adhesion, the second region is surrounded by the first region and concaved relative to the first region, the third region is located between the layer having adhesion and an upper portion of the region in which the organic light emitting element is provided and concaved relative to the second region, and
- wherein a dry agent is located in the third region.
A passive matrix display device comprising:
- a first substrate;
- an organic light emitting element over the first substrate:
- and
- a second substrate which is translucent, the second substrate is bonded to the first substrate through a layer having adhesion,
- wherein minute unevennesses are formed on a surface of the second substrate.
An active matrix display device comprising:
- a first substrate;
- at least one thin film transistor over the first substrate;
- an insulating film over the thin film transistor;
- an organic light emitting element over the insulating film:
- and
- a second substrate which is translucent, the second substrate bonded to the first substrate through a layer having adhesion,
- wherein minute unevennesses are formed on a surface of the second substrate.
A method of manufacturing a display device in which a first substrate on which an organic light emitting element is provided and a second substrate bonded to the first substrate through a layer having adhesion, the method comprising:
- providing a first mask in at least a first region to which the layer having adhesion is adhered;
- first digging the second substrate by an abrasive machining method to form a second region which is concaved relative to the first region;
- removing the first mask;
- providing a second mask at least in a region where the first mask is provided and in a region located above a region where the organic light emitting element is provided:
- second digging the second substrate by an abrasive machining method to thereby form a third region which is concaved relative to the second region;
- and
- providing a dry agent in the third region.
Dependencies are inferred from the claim text.