Display device
The invention provides a technique to manufacture a display device with high image quality and reliability at low cost with high yield. According to the invention, a spacer is provided over a pixel electrode layer in a pixel region. Moreover, a surface of an insulating layer which functions as a partition which covers the periphery of the pixel electrode layer is formed at a high position from the surface of the pixel electrode due to stacked layers under the insulating layer. These spacer and insulator which function as a spacer support a mask used for selectively forming a light emitting material over a pixel electrode layer, thereby preventing the mask from contacting the pixel electrode layer due to a twist and deflection of the mask. Accordingly, such a damage as a crack does not occur in the pixel electrode layer which results in having no defect in shape. Therefore, a display device which performs a high resolution display with high reliability can be manufactured.
1. A display device comprising:
a pixel comprising:
a substrate;
a semiconductor layer over the substrate;
a gate insulating layer over the semiconductor layer;
a gate electrode layer over the gate insulating layer;
an insulating layer over the gate electrode layer;
a source electrode layer or a drain electrode layer over the insulating layer;
a first electrode layer in contact with the source electrode layer or the drain electrode layer over the insulating layer;
an insulator covering and being in contact with the insulating layer, the source electrode layer or the drain electrode layer, and a portion of the first electrode layer;
an electroluminescent layer over and in contact with a first surface of the first electrode layer and the insulator; and
a second electrode layer over and in contact with the electroluminescent layer and the insulator,
wherein the insulator has a first projection portion over a region where the source electrode layer or the drain electrode layer overlaps with the gate electrode layer,
wherein the insulator has a second projection portion over the source electrode layer or the drain electrode layer, wherein the second projection portion does not overlap with the gate electrode layer,
wherein a height of the first projection portion from a surface of the substrate is higher than a height of the second projection portion from the surface of the substrate;
wherein the insulator covers a periphery of the first electrode layer, and
wherein the insulator crosses over the first surface of the first electrode layer parallel to a short side of the first surface of the first electrode layer in two places so that the insulator has a first aperture, a second aperture and a third aperture overlapping with the first surface of the first electrode layer.
2. The display device according to claim 1 , wherein the first electrode layer is a pixel electrode layer.
3. The display device according to claim 1 , further comprising:
a passivation film over the second electrode layer and the insulator.
4. An electronic device having the display device according to claim 1 , wherein the electronic device is one selected from the group consisting of a video camera, a digital camera, a projector, a head mounted display, a car navigation, a car stereo, a personal computer, a game machine, a mobile computer, a portable phone, an electronic book, and an image reproducing device.
5. The display device according to claim 1 , the insulator has a depressed portion between the first projection portion and the second projection portion.
6. A display device comprising:
a pixel comprising:
a substrate;
a thin film transistor including a semiconductor layer, a gate electrode layer and a gate insulating layer between the semiconductor layer and the gate electrode layer over the substrate;
an insulating layer over the thin film transistor;
a source electrode layer or a drain electrode layer over the insulating layer;
a first electrode layer in contact with the source electrode layer or the drain electrode layer over the insulating layer;
an insulator covering and being in contact with the insulating layer, the source electrode layer or the drain electrode layer, and a portion of the first electrode layer;
an electroluminescent layer over and in contact with a first surface of the first electrode layer and the insulator; and
a second electrode layer over and in contact with the electroluminescent layer and the insulator,
wherein the insulator has a first projection portion over a region where the source electrode layer or the drain electrode layer overlaps with the gate electrode layer,
wherein the insulator has a second projection portion over the source electrode layer or drain electrode layer, wherein the second projection portion does not overlap with the gate electrode layer,
wherein a height of the first projection portion from a surface of the substrate is higher than a height of the second projection portion from the surface of the substrate;
wherein the insulator covers a periphery of the first electrode layer, and
wherein the insulator crosses over the first surface of the first electrode layer parallel to a short side of the first surface of the first electrode layer in two places so that the insulator has a first aperture, a second aperture and a third aperture overlapping with the first surface of the first electrode layer.
7. The display device according to claim 6 , wherein the first electrode layer is a pixel electrode layer.
8. The display device according to claim 6 , further comprising:
a passivation film over the second electrode layer and the insulator.
9. An electronic device having the display device according to claim 6 , wherein the electronic device is one selected from the group consisting of a video camera, a digital camera, a projector, a head mounted display, a car navigation, a car stereo, a personal computer, a game machine, a mobile computer, a portable phone, an electronic book, and an image reproducing device.
10. The display device according to claim 6 , the insulator has a depressed portion between the first projection portion and the second projection portion.