Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
1998-12-02
2001-07-24
Wu, Xiao (Department: 2774)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S211000
Reexamination Certificate
active
06266040
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an integrated circuit for liquid crystal display apparatus drive which is employed in a liquid crystal display apparatus (hereafter referred to as a TFT panel) driven at a high potential.
TFT panels have been employed in an increasingly wide range of applications in recent years. This has resulted regarding an intensified effort in technological developments for liquid crystal display system in all technical areas in which image display is required. The need for achieving larger scale and higher resolution display are particularly urgent.
In order to achieve larger scale, it is crucial to increase the scale of the integrated circuit for liquid crystal display apparatus drive and a reduction in the power consumption, since one drive circuit ls required per liquid crystal dot and the number of drive circuits, therefore, increases in proportion to increases in scale and in resolution.
In other technological areas, source voltages for integrated circuits have been steadily reduced in order to reduce power consumption, and at present, the source voltages for most integrated circuits are already down to 2.7V.
However, a drive voltage of approximately 10V is still required for integrated circuits for liquid crystal display apparatus drives, some of which require a large electric field intensity due to the unique quality of liquid crystal drive.
Thus, since a drive voltage of approximately 10V is required to fully realize liquid crystal drive performance, a low voltage portion where signal processing is performed and a high voltage portion where liquid crystal drive is performed coexist in an integrated circuit for liquid crystal display apparatus drive.
However, in an integrated circuit, the pattern area of the high voltage portion is larger relative to the pattern area of the low voltage portion, even when the pattern is otherwise identical.
Consequently, the greatest interest is focused on how the size of this high voltage portion can be reduced in order to achieve a larger scale for the integrated circuit for liquid crystal display apparatus drive.
SUMMARY OF THE INVENTION
An object of the present invention, which has been completed by addressing the problem of integrated circuits for liquid crystal display apparatus drive in the prior art discussed above, is to achieve a larger scale for an integrated circuit for liquid crystal display apparatus drives by reducing the pattern area of the high voltage portion.
In order to achieve the object described above, the present invention adopts the following structures.
(Structure 1)
An integrated circuit for liquid crystal display apparatus drives that comprises an input unit that performs input of a digital signal for liquid crystal display drive, a digital/analog conversion unit that converts the digital signal, which has undergone specific processing after it has been input, to an analog signal and an amplifier unit that amplifies the output from the digital/analog conversion unit to a signal level required for driving the liquid crystal apparatus.
(Structure 2)
An integrated circuit for liquid crystal display apparatus drives that comprises an input unit that performs input of a digital signal for liquid crystal apparatus drive, a digital/analog conversion unit that converts the digital signal, which has undergone specific processing after it has been input, to an analog signal and an amplifier unit that amplifies the output from the digital/analog conversion unit to a signal level required for driving the liquid crystal apparatus, with the amplifier unit constituted of an operating amplifier and a resistor for amplification factor selection.
(Structure 3)
An integrated circuit for liquid crystal display apparatus drives that comprises an input unit that performs input of a digital signal for liquid crystal apparatus drives; a digital/analog conversion unit that converts the digital signal, which has undergone specific processing after it has been input, to an analog signal; and an amplifier unit that is provided at the output side of the digital/analog conversion unit and drives the liquid crystal apparatus. The amplifier unit having an operating amplifier that outputs a signal achieved by processing the output from the digital/analog conversion unit and a reference voltage which it has received; a first switch that transfers either the output from the digital/analog conversion unit or the reference voltage to a first input terminal of the operating amplifier in response to a specific signal; and a second switch that transfers the output from the digital/analog conversion unit to a second input terminal of the operating amplifier when the reference voltage is being transferred to the first input terminal by the first switch and does not transfer the output from the digital/analog conversion unit to the second input terminal when the output from the digital/analog conversion unit is being transferred to the first input terminal by the first switch.
(Structure 4)
An integrated circuit for liquid crystal display apparatus drives that comprises; an input unit that performs input of a digital signal for liquid crystal apparatus drives; a digital/analog conversion unit that converts the digital signal, which has undergone specific processing after it has been input, to an analog signal; and an amplifier unit that is provided at the output side of the digital/analog conversion unit and drives the liquid crystal apparatus. The amplifier unit includes an operating amplifier that outputs a signal achieved by processing an output signal from the digital/analog conversion unit and a reference voltage which it has received; a first switch that transfers either the output from the digital/analog conversion unit or the reference voltage to a first input terminal of the operating amplifier in response to a specific signal; a second switch that transfers the output from the digital/analog conversion unit to a second input terminal of the operating amplifier when the reference voltage is being transferred to the first input terminal by the first switch and does not transfer the output from the digital/analog conversion unit to the second input terminal when the output from the digital/analog conversion unit is being transferred to the first input terminal by the first switch; and a resistor for determining a circuit constant for the operating amplifier.
(Structure 5)
An integrated circuit for liquid crystal display apparatus drives that comprises: an input unit that performs input of a digital signal for liquid crystal apparatus drives; a digital/analog conversion unit that converts the digital signal, which has undergone specific processing after it has been input, to an analog signal; and an amplifier unit that amplifies the output from the digital/analog conversion unit to a signal level required for driving the liquid crystal apparatus. The amplifier unit has an operating amplifier that receives an input signal achieved by adding a specific bias signal to an output signal from the digital/analog conversion unit and amplifies the input signal at a preset amplification factor.
(Structure 6)
An integrated circuit for liquid crystal display apparatus drives that comprises an input unit that performs input of a digital signal for liquid crystal apparatus drives; a digital/analog conversion unit that converts the digital signal, which has undergone specific processing after it has been input, to an analog signal; and an amplifier unit that amplifies the output from the digital/analog conversion unit to a signal level required for driving the liquid crystal apparatus. The amplifier unit has an operating amplifier that receives an input signal achieved by adding a specific bias signal to an output signal from the digital/analog conversion unit and amplifies the input signal at a preset amplification factor; a resistor for determining a circuit constant for the operating amplifier.
(Structure 7)
An integrated circuit for liquid crystal display apparatus drives that comprises; an input unit that
OKI Electric Industry Co., Ltd.
Rabin & Champagne, P.C.
Wu Xiao
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