Seiko Epson Corporation

Intellectual Keystone Technology LLC

Tokuroh Ozawa

Mutsumi Kimura

Yojiro Matsueda

Michael Quinn

Mitsutoshi Miyasaka

Satoshi Inoue

Satoshi Takenaka

Seiichiro Higashi

Takashi Nakazawa

Kiyofumi Kitawada

Minoru Matsuo

Hiroyuki Ohshima

Matsumi Kimura

A display apparatus is provided which is capable of improving display quality by expanding the light-emission area of pixels by improving the layout of pixels and common power-feed lines formed on a substrate. Pixels including a light-emission element, such as an electroluminescence element or an LED element, are arranged on both sides of common power-feed lines so that the number of common power-feed lines is reduced. Further, the polarity of a driving current flowing between the pixels and the light-emission element is inverted so that the amount of current flowing through the common power-supply lines is reduced.

Display apparatus

A transistor circuit is provided including a driving transistor where conductance between the source and the drain is controlled in response to a supplied voltage, and a compensating transistor where the gate is connected to one of the source and the drain, the compensating transistor being connected so as to supply input signals to the gate of the driving transistor through the source and drain. In a transistor circuit where conductance control in a driving transistor is carried out in response to the voltage of input signals, it is possible to control the conductance by using input signals of a relatively low voltage and a variance in threshold characteristics of driving transistors is compensated. With this transistor circuit, a display panel that can display picture images with reduced uneven brightness is achieved.

Transistor circuit, display panel and electronic apparatus

A display apparatus, that includes current driving type luminescent elements, has a driving system that takes the conduction types of TFTs to control the emission of the luminescent elements into consideration. In order to reduce driving voltage and improve display quality simultaneously, the arrangement is provided such that if the second TFT which performs the 'on-off' function of the current for the luminescent element is of an N channel type, the potential of the common power supply line ('com') is lowered below the potential of the opposite electrode (&#x201c;op&#x201d;) of the luminescent element to obtain a higher gate voltage (&#x201c;Vgcur&#x201d;). In this case, if the first TFT connected to the gate of the second TFT is of a P channel type, when using the potential of the potential-holding electrode (&#x201c;st&#x201d;) at the &#x201c;on&#x201d; state as a reference, potentials of the scanning signal (&#x201c;Sgate&#x201d;) at the lower potential and the common power supply line (&#x201c;com&#x201d;) are rendered of the same polarities with respect to this potential of the potential-holding electrode (&#x201c;st&#x201d;). Therefore, the potential of the image signal (&#x201c;data&#x201d;) to turn &#x201c;on&#x201d; can be shifted within the range of the driving voltage in the display apparatus in the direction to reduce resistances at the &#x201c;on&#x201d; states of the first TFT and the second TFT to reduce driving voltage and improve display quality.

For the purpose of providing a display apparatus capable of improving display quality by expanding the light-emission area of pixels by improving the layout of pixels and common power-feed lines formed on a substrate, pixels (A,B) including a light-emission element (), such as an electroluminescence element or an LED element, are arranged on both sides of common power-feed lines (com) so that the number of common power-feed lines (com) is reduced. Further, the polarity of a driving current flowing between the pixels (A,B) and the light-emission element () is inverted so that the amount of current flowing through the common power-supply lines 'com' is reduced.

A display device having a substrate, a power supply line, and a pixel electrode. The display device also having a transistor having a gate electrode and electrically coupled between the power supply line and the pixel electrode, a opposite electrode, and an organic semiconductor film disposed between the pixel electrode and the opposite electrode. The display device further having a holding capacitor having a first electrode electrically coupled to the gate electrode of the transistor, a second electrode, and a first insulation film disposed between the first electrode and second electrode and a second insulation film. The holding capacitor of the display device being disposed between the substrate and the second insulation film and at a part of the second insulation film being disposed between the pixel electrode and the substrate.

An electroluminescent apparatus having a substrate and a transistor formed above the substrate and having a gate electrode and a semiconductor film. The electroluminescent apparatus having a first insulation film including a first contact hole and a junction electrode contacted to the semiconductor film through the first contact hole. The electroluminescent apparatus having a second insulation film formed above the junction electrode and the first insulation film and including a second contact hole and a pixel electrode formed on the second insulation film and contacted to the junction electrode through the second contact hole. The electroluminescent apparatus having an insulating layer formed above the second insulation film, an organic semiconductor film formed at an emitting region above the pixel electrode, and an opposite electrode formed above the organic semiconductor film and insulating layer. The insulating layer surrounding the emitting region and overlapping the second contact hole.

A display device having a scanning line, a data line, a power supply line, and a pixel. The pixel having a first transistor supplied with a selecting pulse of a scanning signal, a holding capacitor having a first electrode and a second electrode that holds an image signal from the data line and the first thin film transistor. The pixel also having a second transistor controlled by the image signal, a gate of the second transistor being electrically connected to the second electrode, and a luminescent element provided between a pixel electrode and an opposite electrode opposed to the pixel electrode driven by current that flows between the pixel electrode and the opposite electrode. A potential of the gate electrode of the second transistor being able to be shifted by supplying to the first electrode of the holding capacitor with a predetermined signal after the selecting pulse becomes non-selective.

It is an object to provide a high-performance display element driving device or the like which can be easily reduced in power consumption and scale. A display element driving device () drives a liquid crystal serving as a capacitive display element. A D/A converter () includes first to Nth charge storage sections (-) to (-N) for receiving first to Nth digital data corresponding an image signal and storing charges corresponding to the values of the first to Nth digital data, and first to Nth connection sections (-) to (-N) for electrically connecting the first to Nth charge storing sections (-) to (-N) and an electrode line () to each other and discharging the stored charges to the electrode line () at a given timing. In this manner, &#x3b3;-correction of a liquid crystal and D/A conversion can be simultaneously performed, and conversion from RGB to YUV and D/A conversion can be simultaneously performed.

Growing community of inventors

Suwa, Japan

Tokuroh Ozawa