摘要:
Problems exist in areas such as image visibility, endurance of the device, precision, miniaturization, and electric power consumption in an information device having a conventional resistive film method or optical method pen input function. Both EL elements and photoelectric conversion elements are arranged in each pixel of a display device in an information device of the present invention having a pen input function. Information input is performed by the input of light to the photoelectric conversion elements in accordance with a pen that reflects light by a pen tip. An information device with a pen input function, capable of displaying a clear image without loss of brightness in the displayed image, having superior endurance, capable of being miniaturized, and having good precision can thus be obtained.
摘要:
Etching of a semiconductor layer including a part over a gate wiring and formation of a contact hole for connection between a pixel electrode and a drain electrode are performed by one-time photolithography step and one-time etching step; thus, the number of photolithography steps is reduced. The exposed part of the gate wiring is covered by an insulating layer, and this insulating layer also functions as a spacer for maintaining a space for a liquid crystal layer. By the reduction in the number of photolithography steps, a liquid crystal display device can be provided at lower cost and higher productivity. Using an oxide semiconductor for the semiconductor layer can realize a liquid crystal display device with low power consumption and high reliability.
摘要:
An object of the invention is to suppress degradation in image quality of a liquid crystal display device which performs display by field sequential method and to reduce power consumption of a backlight. The highest brightness of a first color light in a pixel region is detected. Gamma correction is performed so that transmittance of a pixel of the region displaying the highest brightness of the first color light is set to maximum and transmittance of other pixel of the region is decreased in accordance with lowering of the first color light intensity, and the region is irradiated with the highest brightness of the first color light. Similarly, a second color light is irradiated in another region concurrently with irradiation of the first color, whereby input of an image signal and lighting of the backlight are performed simultaneously in every region of the pixel portion.
摘要:
An object is to provide a liquid crystal display device capable of image display according to an environment around the liquid crystal display device, e.g., in a bright environment or a dim environment. Another object is to provide a liquid crystal display device capable of displaying an image in both modes of a reflective mode in which external light is used as a light source and a transmissive mode in which a backlight is used. In order to achieve at least one of the above objects, a liquid crystal display device is provided with a region (a reflective region) where display is performed with reflection of incident light through a liquid crystal layer and a region (a transmissive region) where display is performed with transmission of light from a backlight and can switch the transmissive mode and the reflective mode. In the case where a full-color image is displayed, a pixel portion includes at least a first region and a second region, a plurality of lights of different hues are sequentially supplied to the first region according to a first order, and a plurality of lights of different hues are also sequentially supplied to the second region according to a second order which is different from the first order.
摘要:
In an active matrix type liquid crystal display device, in which functional circuits such as a shift register circuit and a buffer circuit are incorporated on the same substrate, an optimal TFT structure is provided along with the aperture ratio of a pixel matrix circuit is increased. There is a structure in which an n-channel TFT, with a third impurity region which overlaps a gate electrode, is formed in a buffer circuit, etc., and an n-channel TFT, in which a fourth impurity region which does not overlap the gate electrode, is formed in a pixel matrix circuit. A storage capacitor formed in the pixel matrix circuit is formed by a light shielding film, a dielectric film formed on the light shielding film, and a pixel electrode. Al is especially used in the light shielding film, and the dielectric film is formed anodic oxidation process, using an Al oxide film.
摘要:
Included are a display panel including first to third pixel regions and a driver circuit; a backlight portion divided into a first light source region where light is emitted in response to input of a video signal to the first pixel region, a second light source region where light is emitted in response to input of a video signal to the second pixel region, and a third light source region where light is emitted in response to input of a video signal to the third pixel region; a video signal selection circuit used to supply the video signals from plural memory circuits to the driver circuit; a control circuit that supplies a control signal for controlling the driver circuit; a sequence determination circuit that supplies a backlight control signal and a selection signal; and a random number generation circuit used for selection from colors in the sequence determination circuit.
摘要:
In a conventional display device comprising a sub-display, the display device is increased in thickness and in the number of components as the number of displays is increased. In the present invention, a dual emission display device is used so that either surface of a display is used as a main display or a sub-display. Accordingly, the display device can be reduced in thickness and in the number of components. Further, mechanical reliability can be enhanced when the invention is applied to a tablet PC, a video camera and the like.
摘要:
It is an object to provide a transmissive liquid crystal display device in which power consumption is reduced and deterioration in display quality is suppressed. As a backlight, a surface-emission light source is employed. The light source is a light source which performs surface light emission, so that the light emission area is large. Accordingly, the backlight can effectively radiate heat. Thus, even in the case where an image signal is not input to a pixel for a long period, the pixel can hold the image signal. In other words, both a reduction in power consumption and a suppression of deterioration in display quality can be realized.
摘要:
The purpose of the present invention is to provide a reliable semiconductor device comprising TFTs having a large area integrated circuit with low wiring resistance. One of the features of the present invention is that an LDD region including a region which overlaps with a gate electrode and a region which does not overlap with the gate electrode is provided in one TFT. Another feature of the present invention is that gate electrode comprises a first conductive layer and a second conductive layer and portion of the gate wiring has a clad structure comprising the first conductive layer and the second conductive layer with a low resistance layer interposed therebetween
摘要:
A semiconductor device which includes a thin film transistor having an oxide semiconductor layer and excellent electrical characteristics is provided. Further, a method for manufacturing a semiconductor device in which plural kinds of thin film transistors of different structures are formed over one substrate to form plural kinds of circuits and in which the number of steps is not greatly increased is provided. After a metal thin film is formed over an insulating surface, an oxide semiconductor layer is formed thereover. Then, oxidation treatment such as heat treatment is performed to oxidize the metal thin film partly or entirely. Further, structures of thin film transistors are different between a circuit in which emphasis is placed on the speed of operation, such as a logic circuit, and a matrix circuit.