Display device
A technology for display devices and digital images, applied in static indicators, optics, signal transmission systems, etc., can solve problems such as low voltage and low power consumption of liquid crystal display devices that are difficult to achieve
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no. 1 Embodiment
[0030] Next, a display device according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram of a display device according to a first embodiment. In the figure, only one pixel portion is shown for simplicity, but in an actual display device, the pixel portions are arranged in a plurality of rows and columns.
[0031] A gate signal line G1 is arranged in one direction on an insulating substrate (not shown). A scanning signal is supplied to the gate signal line G1 by a gate drive (not shown). Four drain signal lines D0 to D3 are arranged in a direction crossing the gate signal line G1 . The digital data drive circuit 1 outputs a 4-bit digital video signal according to the sampling signal. Data corresponding to each bit of the digital video signal is output to the drain signal lines D0 to D3 . The lowest bit is output to the drain signal line D0, and the highest bit is output to the drain signal line D3. ...
no. 2 Embodiment
[0053] Next, a display device according to a second embodiment of the present invention will be described with reference to the drawings. Figure 4 It is a circuit diagram of the display device of the second embodiment. In the figure, only one pixel portion is shown for simplicity, but in an actual display device, the pixel portions are arranged in a plurality of rows and columns. In addition, the same reference numerals are attached to the same structural parts as those in FIG. 1 for explaining the first embodiment, so the description thereof will be omitted.
[0054] In this embodiment, there is a big difference in that static memory circuits 5 to 8 are provided instead of the capacitors CS0 to CS3 for data storage in the first embodiment. The static memory circuits 5-8 can be constituted by two inverter circuits of positive feedback. In the first embodiment, a reset operation was required to hold data, but in this embodiment, data can be held more reliably because it is a...
no. 3 Embodiment
[0056] Next, a display device according to a third embodiment of the present invention will be described with reference to the drawings. As described above, in the first and second embodiments, the voltage ΔV corresponding to the digital video signal data is generated at the pixel electrode 19 as shown in the formula (2). According to the formula (2), the variation range of the voltage ΔV decreases with the increase of the digital video signal data. In particular, when the number of bits of the digital video signal data increases, there are problems such as that the range of change in the voltage ΔV is significantly reduced at the side where the data is larger, and the γ characteristic is deteriorated. This problem is further explained with reference to FIG. 5 .
[0057] Figure 5 is a graph showing the liquid crystal voltage-luminance characteristics of a liquid crystal display device, where the horizontal axis represents the liquid crystal voltage V LC (voltage applied be...
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