Driving circuit and voltage generating circuit and display equipment using them

Abstract

A drive circuit with a first voltage supply, and a second voltage supply that provides a voltage that is lower than the first voltage supply. The drive circuit also has a first transistor with either a drain or a source terminal connected to the first voltage supply, and a second transistor with either a drain or source terminal connected to the second voltage supply. A signal line is connected to each gate terminal of the first and second transistors, and at least one capacitance load is connected to respective terminals of the first and the second transistors that are not connected to the first and second voltage supplies. The signal line conveys signals having a high level that is substantially the same or higher than the voltage of the first voltage supply and a low level that is substantially the same or lower than the voltage of the second voltage supply.

Description

technical field [0001] The present invention relates to a driving circuit and a voltage generating circuit and a display unit, and in particular to integrating the circuits in the load driving circuit and the voltage generating circuit on the same substrate as that of the display unit and the arrangement therein. Background technique [0002] A liquid crystal display device is used in various fields due to its advantages, such as light weight, thin cross-section, and low power consumption, compared with a CRT (cathode ray tube). [0003] As shown in FIG. 1, an active matrix liquid crystal display device has a liquid crystal display portion 11 in which pixels having amorphous silicon (a-Si) thin film transistors (TFTs) as switching elements are arranged in a matrix in a glass substrate. [0004] The liquid crystal display device is externally equipped with: data driver ICs (integrated circuits) 21-1 to 21-5 for driving data lines; gate driver ICs 31-1 to 31-8 for controlling ...

AI Technical Summary

Problems solved by technology

Therefore, in order to mount the common drive circuit IC 40 on the same substrate 10 as that of the pixels in the liquid crystal display device, a large area for placing the common drive circuit IC 40 must be reserved in the form of a non-display portion, thus making the frame narrower. become difficult

[0013] Although a symmetrical frame design is required for the entire liquid crystal display device including the driving circuit, it is not easy to make the frame symmetrical in arranging the common driving circuit IC40

[0014] As described above, in conventional liquid crystal display devices, there is a problem that a common drive circuit using TFTs requires a larger area because TFTs have lower current capacity than bipolar transistors and monocrystalline silicon MOSFETs.

[0015] In addition, in the conventional liquid crystal display device, there is another problem that the common driving circuit has a large current area and is easily affected by line resistance, and in order to place the TFT on the same substrate as the pixel in the liquid crystal display device common drive circuit, requiring wide and asymmetric frame

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