JPH031120A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To make a display having no irregularity in density by providing 1st and 2nd resistances which are connected in series with a capacitor between the inverted input terminal and output terminal of an operational amplifier circuit and driving a liquid crystal panel by using a voltage developed between the resistance. CONSTITUTION:Voltages developed across resistances 1 - 5 are denoted as V0 - V5. The capacitor 7 and series-connected resistances 8 and 9 are connected between the uninverted input terminal and output terminal of the operational amplifier circuit 6 and the voltage developed between the resistances 8 and 9 is denoted as V4'. Similar circuit constitution is formed as to the voltages V1 - V3 and the voltages V1' - V4' and voltages V0 and V5 are used to drive the liquid crystal panel. In this case, the resistance 9 prevents a rush current which is discharged by the capacitor formed of the liquid crystal panel from flowing to the output of the operational amplifier circuit 6 and the resistance 8 and capacitor 7 correct the phase to reduce the disturbance of the voltages V1' - V4'. Consequently, the display having a small irregularity in density is made.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a circuit groove bottom of a power supply section of an IL1 item display device.

(Prior art) The conventional technology is shown in Figure 2.As shown in the figure, resistors 1 to
A voltage obtained by dividing the voltage applied to both ends at 5 is input to the non-inverting input of the arithmetic amplification circuit 6, and the inverting input and output are directly connected, and the voltage generated at this output is used to drive the liquid crystal panel. Was.

[Problem to be solved by the invention]

However, with conventional technology, since the liquid crystal panel is electrically equivalent to a capacitor, depending on the displayed content, a large current flows directly from the liquid crystal panel to the output of the arithmetic amplification circuit in a short period of time. The output voltage has become distorted.

As a result, there is a problem in that unevenness of display density occurs in the display of the liquid crystal panel, and the display quality is significantly degraded.

The present invention solves this problem by preventing disturbances in the voltage that drives the liquid crystal panel, and the purpose of the present invention is to provide a liquid crystal display device that can perform uniform display without causing unevenness in the display. It is in.

[Means to solve the problem]

The liquid crystal display device of the present invention is a liquid crystal display device that drives a liquid crystal panel using a plurality of voltages divided by resistors, etc., in which at least one voltage among the plurality of voltages is is input to the non-inverting input of the arithmetic amplification circuit, a capacitor is provided between the inverting input and the output of this arithmetic amplification circuit, and the first and second resistors connected in series are connected to the arithmetic amplification circuit described above. It is characterized by having means provided between the inverting input and the output of the circuit, and driving the liquid crystal panel using the voltage generated between the first and second resistors.

〔Example〕

The present invention will be explained using an example.

FIG. 1 shows the circuit configuration of the present invention.

1 to 5 are resistors, and a voltage is applied to both ends.

Therefore, a voltage is generated across each of the resistors 1 to 5.

From the top of the voltage, VOlvl, v2, v3, V4, V5
I'll leave it as that.

First, regarding the voltage V4, 6 is an arithmetic amplification circuit, and one to four of them are constituted by integrated circuits housed in the same package. Here, the voltage V4 is input to the non-inverting input of the arithmetic amplification circuit 6. A capacitor 7 and a first resistor 8 and a second resistor 9 connected in series are connected between the non-inverting input and the output of the arithmetic amplification circuit 6.

The voltage generated between the first resistor 8 and the second resistor 9 is defined as a voltage V4'. The above is the configuration.

Similarly, the circuit configurations are similar for voltages v1 to v3, and the generated voltages are expressed as voltages Vl' to Vl' to V3 as shown in the figure.
Let it be V3'. Voltages v1 to v4 and voltages v1' to V4'
have the same voltage. And this voltage Vl' ~ V4'
and VO1v5 are used to drive the liquid crystal panel.

Here, the capacitance of the capacitor formed between each scanning electrode of the liquid crystal panel (not shown) and the signal electrode is set to 00, and the first,
The resistance of the second resistor 8.9 is set as R8 and R2, and the capacitor 7
Letting the capacity of C be C, C-R1- has -C, -R2K-0,
The capacitance of each resistor 8.9 and capacitor 7 is determined to be 1 to 10.

With the above configuration, the second resistor 9 prevents the rush current discharged by the capacitor formed by the liquid crystal panel (not shown) from flowing to the output of the arithmetic amplification circuit 6. or,
Since phase correction is performed by the first resistor 8 and capacitor 7, disturbances in the voltages V1' to V4' become extremely small.

As a result, a uniform display with less uneven display density could be achieved.

Further, although the voltages v1 to v4 are constant voltages due to resistance division in this embodiment, even when changing the voltages V1 to v4 as necessary, the present invention similarly applies to changes in the voltages v1 to v4. The voltages Vl' to V4' follow smoothly without any disturbance in the voltage, and the same effect can be obtained.

Further, even if a similar circuit is configured for the voltage vO1v5, the same effect can be obtained.

〔Effect of the invention〕

As described above, the first and second resistors connected in series with the capacitor are provided between the inverting input and the output of the operational amplifier circuit, and the voltage generated between the first and second resistors is By using this to drive a liquid crystal panel, it has become possible to display a uniform display with no unevenness in display density.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the circuit configuration of a liquid crystal display device according to the present invention. FIG. 2 is a diagram showing a circuit configuration of a conventional technique. 1-5・ 6・・φ 71　φ 81 dispute 9.1 ·resistance ・Operation amplification circuit conflict capacitor ・First resistance ・Second resistance that's all No. ? figure

Claims (1)

[Claims] In a liquid crystal display device that drives a liquid crystal panel using a plurality of voltages divided by resistors, etc., at least one voltage among the plurality of voltages is converted into a non-inverting circuit of an arithmetic amplification circuit. a capacitor is provided between the inverting input and the output of the arithmetic amplification circuit, and first and second resistors connected in series are provided between the inverting input and the output of the arithmetic amplification circuit; A liquid crystal display device comprising means for driving the liquid crystal panel using a voltage generated between the first and second resistors.