摘要:
In the case where variations of environmental temperature or variations with time occur depending on characteristics of a light-emitting element, variations are generated in luminance. In the invention, a display device for suppressing effects due to variations of a current value of a light-emitting element, which is caused by variations of environmental temperature and variations with time.A first substrate having a pixel portion in which pixels constituted by a plurality of transistors are arranged in matrix has a source driver for supplying a video signal, a gate driver for selecting a pixel, a power source circuit, and a compensation circuit for compensating variations in characteristics of a light-emitting element. The first substrate is connected to a second substrate through a connecting wire, and the second substrate has a controller and a video memory. The controller is a piece for making a signal which is necessary for a display device to display from image data to be inputted externally such as a CPU by using a video memory as required.
摘要:
The present invention provides a display device which can display characters clearly and display images smoothly. An area gray scale method is adopted and a configuration of one pixel is changed depending on a mode, by selecting one or more display regions in each pixel. When characters are needed to be displayed clearly, one pixel is configured by selecting a stripe arrangement. Thus, clear display can be conducted. When images are needed to be displayed, one pixel is configured by selecting an indented state. Thus, smooth display can be conducted.
摘要:
The present invention provides a display device which can display characters clearly and display images smoothly. An area gray scale method is adopted and a configuration of one pixel is changed depending on a mode, by selecting one or more display regions in each pixel. When characters are needed to be displayed clearly, one pixel is configured by selecting a stripe arrangement. Thus, clear display can be conducted. When images are needed to be displayed, one pixel is configured by selecting an indented state. Thus, smooth display can be conducted.
摘要:
[Problem] In the case where variations of environmental temperature or variations with time occur depending on characteristics of a light-emitting element, variations are generated in luminance. In the invention, a display device for suppressing effects due to variations of a current value of a light-emitting element, which is caused by variations of environmental temperature and variations with time.[Solving Means] A first substrate having a pixel portion in which pixels constituted by a plurality of transistors are arranged in matrix has a source driver for supplying a video signal, a gate driver for selecting a pixel, a power source circuit, and a compensation circuit for compensating variations in characteristics of a light-emitting element. The first substrate is connected to a second substrate through a connecting wire, and the second substrate has a controller and a video memory. The controller is a piece for making a signal which is necessary for a display device to display from image data to be inputted externally such as a CPU by using a video memory as required.
摘要:
A method of manufacturing, with high mass productivity, liquid crystal display devices having highly reliable thin film transistors with excellent electric characteristics is provided. In a liquid crystal display device having an inverted staggered thin film transistor, the inverted staggered thin film transistor is formed as follows: a gate insulating film is formed over a gate electrode; a microcrystalline semiconductor film which functions as a channel formation region is formed over the gate insulating film; a buffer layer is formed over the microcrystalline semiconductor film; a pair of source and drain regions are formed over the buffer layer; and a pair of source and drain electrodes are formed in contact with the source and drain regions so as to expose a part of the source and drain regions.
摘要:
The present invention provides a driving method of a display device for expressing gray scales with n bits (n is an integer) by dividing one frame into a plurality of subframes. By this driving method, pseudo contours which occur in displaying images by a time gray scale method can be reduced.
摘要:
It is an object of the present invention to provide a display device in which images can be seen under a dark place to intense external light. In the display device, display is performed by changing the gray scale number depending on external light intensity, and display modes can be switched depending on contents displayed on the screen. An analog mode and a digital mode are switched depending on external light intensity. In an analog digital switching circuit, when a video signal is an analog value, a signal is outputted to a pixel array without any change and, when the video signal is a digital value, the signal is outputted to a circuit that performs a digital operation such as a latch circuit. Consequently, display gray scales of a pixel are changed appropriately. Accordingly, a clear image can be displayed. For example, it is possible to ensure visibility in a wide range of a dark place or under indoor florescent light to outdoor sun light.
摘要:
The present invention provides a driving method of a display device for expressing gray scales with n bits (n is an integer) by dividing one frame into a plurality of subframes. By this driving method, pseudo contours which occur in displaying images by a time gray scale method can be reduced.
摘要:
An object is to propose a method of manufacturing, with high mass productivity, liquid crystal display devices having thin film transistors with highly reliable electric characteristics. In a liquid crystal display device having an inverted staggered thin film transistor, the inverted staggered thin film transistor is formed as follows: a gate insulating film is formed over a gate electrode; a microcrystalline semiconductor film which functions as a channel formation region is formed over the gate insulating film; a buffer layer is formed over the microcrystalline semiconductor film; a pair of source and drain regions are formed over the buffer layer; and a pair of source and drain electrodes are formed in contact with the source and drain regions so as to expose a part of the source and drain regions.
摘要:
There is no method combining advantages of both an analog gray scale method and a digital gray scale method. An object is to provide a means that can perform display in a plurality of display modes. In a display mode-specific video signal generation circuit, an input video signal is output as an analog value without any change, as a binary digital value, and as a multi-valued digital value. As a result, a display gray scale of a pixel changes in a timely manner. Accordingly, a clear image can be displayed. In other words, an analog signal and a digital signal are switched and input to a source driver. In addition, the display device also includes a means that switches and outputs an analog signal and a digital signal. By using such means, the display device can have the advantages of both the analog gray scale method and the digital gray scale method, thereby achieving the above object.