摘要:
It is an object to provide a display device in which a problem of light leakage from a liquid crystal element in black display is reduced or overcome and the contrast is improved. It is another object to provide a pixel circuit having a function to control a lighting state of a backlight based on each pixel. These objects are achieved by turning off a light-emitting element in display of a black gray scale, and by providing a light-emitting element in each pixel and providing, in a pixel circuit, a function to individually control lighting and non-lighting of the light-emitting element depending on a gray scale to perform display. When a backlight is provided in each pixel, a light-emitting element that is a backlight is turned off when a black gray scale is displayed, whereby reduction in contrast due to light leakage from a liquid crystal element can be prevented.
摘要:
It is an object to achieve downsizing and a thin shape of a display module and an electronic device provided with the display module. The display module includes a first display panel in which a first display screen is formed on one main side; and a second display panel that is smaller than and overlapped with the first display panel, in which a second display screen is formed on an opposite side of the one main side. The display module includes, over a sealing substrate of the first display panel and/or the second display panel, at least one integrated circuit, which is connected to input terminals of the first display panel and the second display panel and controls operation of the both panels, arranged in a peripheral portion of the second display panel, which is a surface on an opposite side of a display surface of the first display panel.
摘要:
An object is to improve the drive capability of a semiconductor device. The semiconductor device includes a first transistor and a second transistor. A first terminal of the first transistor is electrically connected to a first wiring. A second terminal of the first transistor is electrically connected to a second wiring. A gate of the second transistor is electrically connected to a third wiring. A first terminal of the second transistor is electrically connected to the third wiring. A second terminal of the second transistor is electrically connected to a gate of the first transistor. A channel region is formed using an oxide semiconductor layer in each of the first transistor and the second transistor. The off-state current of each of the first transistor and the second transistor per channel width of 1 μm is 1 aA or less.
摘要:
A semiconductor device including a plurality of pixels over a substrate and a display medium including an electronic ink over the substrate, in which at least one pixel of the plurality of pixels comprises first and second subpixels each of which comprises a transistor that comprises an oxide semiconductor including indium, and in which one image of at least one of the plurality of pixels is displayed by a plurality of signals, is provided.
摘要:
A pixel is divided into m (m is an integer of m≧2) sub-pixels, and an area ratio of an s-th (s is an integer of 1 to m) sub-pixel is to be 2s−1. Also, k (k is an integer of k≧2) sub-frame groups including a plurality of sub-frames are provided in one frame, along with dividing one frame into n (n is an integer of n≧2) sub-frames, so that a ratio of a lighting period length of a t-th (t is an integer of 1 to n) sub-frame is 2(t−1)m. Further, each of the n sub-frames is divided into k sub-frames each having a lighting period length that is about 1/k of each of the n sub-frames, and one of these is provided in each of the k sub-frame groups.
摘要:
It is an object of the present invention to reduce a cause of pseudo contour when display is performed with a time gray scale method. According to the present invention, one pixel is divided into m sub-pixels so that an area ratio of each sub-pixel becomes 20:21:22: . . . :2m−3:2m−2:2m−1 (m is an integer number of m≧2), and one frame is divided into n sub-frames so that a ratio of a lighting period in each sub-frame becomes 20:2m:22m: . . . :2(n−3)m:2(n−2)m:2(n−1)m (n is an integer number of n≧2). Then, a gray scale is expressed by controlling a manner of lighting in each of the m sub-pixels in each of the n sub-frames.
摘要:
Outside light is received using a light sensor, and in accordance with the outside light intensity, each of a first display mode which expresses multiple gray scales and a second display-y mode which expresses a gray scale smaller in number than that in the first display mode is switched and used. The switching is controlled by a display controller based on data of the outside light intensity. Accordingly, the visibility can be ensured in a wide range of situations, from under a fluorescent lamp in a dark place or inside, to under sunlight outside. In the second display mode, frequencies of a start pulse and a clock pulse to be inputted to a source signal line driver circuit are reduced and a driving voltage is decreased by the display controller; accordingly, a frame period can be longer than that in the first display mode and power consumption can be reduced.
摘要:
The invention provides an active matrix EL display device which can perform a clear multi-gray scale color display. In particular, the invention provides a large active matrix EL display device at low cost by a manufacturing method which can selectively form a pattern. Power supply lines in a pixel portion are arranged in matrix by the manufacturing method which can selectively form a pattern. Further, capacitance between wirings is reduced by providing a longer distance between adjacent wirings by the manufacturing method which can selectively form a pattern.
摘要:
In an EL display device which performs area grayscale display, image quality is improved and stabilized. A plurality of subpixels each having light emitting elements which emit light of approximately the same color and a plurality of monitor pixels each having the same number of subpixels as the pixel are provided. The light emitting element in the monitor pixel is manufactured at the same time as the light emitting element in the pixel, and the electrode of the light emitting element in the monitor pixel is connected to a different constant current source in each subpixel. A circuit for changing a potential of the electrode of the light emitting element in the pixel for each subpixel in accordance with a potential change of the electrode of the light emitting element of the monitor pixel, thereby the aforementioned purposes are achieved.
摘要:
An e-book reader including a display panel having a thin film transistor with stable electrical characteristics is provided. Alternatively, an e-book reader capable of holding images for a long time is provided. Alternatively, a high-resolution e-book reader is provided. Alternatively, an e-book reader with low power consumption is provided. Display on the display panel of the e-book reader is controlled by a thin film transistor whose channel formation region is formed using an oxide semiconductor which is an intrinsic or substantially intrinsic semiconductor by removal of an impurity that might be an electron donor in the oxide semiconductor and has a larger energy gap than a silicon semiconductor.