JPH0426886A - Plate type display device - Google Patents

Abstract

PURPOSE:To obtain a plate type display device whose power consumption is low by preventing a pulse for driving an electrode on a scanning side from being impressed on the plate type display device main body so that power for driving may not be consumed in the case that all the picture elements of one scanning line are turned off. CONSTITUTION:This device is provided with a circuit 10 which detects the presence or absence of a picture element turn-on signal in the data signals of one scanning line and a generation circuit of the pulse for driving the electrode on the scanning side 13 which is actuated only when the data signal for turning on the picture element exists in the data signals of one scanning line. In the case of detecting the data that all the picture elements of one scanning line are turned off, the pulse for driving the scanning electrode is not generated. Thus, the pulse for driving the scanning electrode which does not contribute to turn-on and an output from a semiconductor device for driving an electrode or a refresh pulse thereto are prevented from being generated, thereby obtaining the plate type display device whose power consumption is low.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to reducing the power consumption of a flat panel display device used for displaying characters, graphics, and the like.

BACKGROUND OF THE INVENTION FIG. 6 shows a block diagram of a driving circuit for a flat panel display device according to a conventional example.

In FIG. 6, 60 is a flat panel display main body, 61 is a pulse generation circuit for driving scanning side electrodes of the flat panel display main body 6o, 62 is a group of semiconductor devices for driving scanning side electrodes of the flat panel display main body 6o, Reference numeral 63 denotes a group of semiconductor devices for driving data-side electrodes of the flat panel display device main body 6o, 64 denotes a data signal input terminal for taking in pixel lighting data into the semiconductor device group 63 for driving data-side electrodes, and 65 denotes a refresh pulse generation circuit r6. .

In the flat panel display device configured as described above, the flat panel display device main body 6o is driven by the scanning side electrode driving semiconductor device group 62 by the scanning side electrode driving pulse generated by the scanning side electrode driving pulse generation circuit 61. Then, the scanning electrodes are sequentially driven line-by-line based on the pixel on/off data of the data-side electrode driving semiconductor device group 63 read from the data signal input terminal 64.

In addition, in a flat panel display device that applies a refresh pulse after completing line sequential scanning for one screen, after completing line sequential scanning for one screen, the refresh pulse generating circuit 65 further applies a refresh pulse to a group of semiconductor devices for driving scan side electrodes. 62, all scanning electrodes of the flat panel display main body 6o are driven regardless of whether the pixels are on or off.

Problems to be Solved by the Invention However, in the flat panel display device as described above, even when all the pixels for one scanning line are off, it is difficult to apply a pulse for driving the scanning side electrode to the flat panel display device main body 6o. Since the pixels are driven line-sequentially, driving power is consumed in the flat panel display device main body 60 and the semiconductor device group 62 for driving the scan-side electrodes even though the pixels are not actually lit. .

In view of this point, the present invention provides that when all the pixels for one scanning line are off, the pulse for driving the scanning side electrode is not applied to the flat panel display device main body 60, so that the flat panel display device main body 60 and the scanning Side electrode driving semiconductor device group 62
An object of the present invention is to provide a flat panel display device with lower backpower by eliminating the consumption of driving power in the device.

Furthermore, in the above-mentioned flat panel display device, even when all the pixels for one screen are off, the refresh pulse is applied to all scanning electrodes of the flat panel display device body 6o, so they are not actually lit. Even though this is not the case, driving power is consumed in the flat panel display device main body 60 and the scanning side electrode driving semiconductor device group 62.

In view of this, the present invention does not generate a fresh pulse when all the pixels for one screen are turned off, so that the driving force in the flat panel display device body 60 and the semiconductor device group 62 for driving the scanning side electrodes can be improved. The purpose of the present invention is to eliminate power consumption and provide a flat panel display device with lower power consumption.

Means for Solving the Problems (1) The present invention is characterized in that when data is detected that causes all pixels of one scanning line to turn off, a pulse for driving the scanning type is not generated.

(2) The present invention is characterized in that when data is detected that causes all pixels for one scanning line to turn off, the output of the scanning side electrode driving semiconductor device is turned off.

(3) If data is detected in which all pixels for one screen are turned off, a refresh pulse is not generated after one screen is scanned.

Function: With this configuration, it is possible to omit the generation of scanning electrode driving pulses, outputs of electrode driving semiconductor devices, or refresh pulses that do not contribute to lighting.

Embodiment FIG. 1 shows a block diagram according to a first embodiment of the present invention.

In FIG. 1, 10 is a circuit for detecting the presence or absence of a pixel lighting signal in a data signal for one scanning line, 11 is a flat panel display device body, and 12 is a group of semiconductor devices for driving scan-side electrodes of the flat panel display device body 11. , 13 is a pulse generation circuit for driving the scanning electrode of the flat panel display device main body 11, 14 is a semiconductor device group for driving the data side electrode of the flat panel display device main body 11, and 15 is a pixel in the semiconductor device group 14 for driving the data side electrode. This is a data signal input terminal for taking in lighting data.

The characteristics of the power consumption reduction circuit of the first embodiment configured as described above will be explained below.

According to the present embodiment, as shown in FIG. When the circuit 1o that detects the presence or absence of a pixel lighting signal in the pixel lighting signal detects that all the data signals for one scanning line are pixel lighting data, a signal is sent to the scanning side electrode driving pulse generation circuit 13. By applying a signal so as not to emit scanning side electrode driving pulses,
Power consumption in the scan-side electrode driving semiconductor device group 12 and the flat panel display device main body 11 does not occur.

As described above, according to this embodiment, power consumption can be reduced by not emitting unnecessary pulses.

Next, a second embodiment will be described with reference to FIG.

In FIG. 2, 20 is a circuit for detecting the presence or absence of a pixel lighting signal in a data signal for one scanning line, 21 is a flat panel display device body, and 22 is a group of semiconductor devices for driving scan-side electrodes of the flat panel display device body 21. , 23 is a pulse generation circuit for driving the scanning side electrode of the flat panel display device body 21, 24 is a semiconductor device group for driving the data side electrode of the flat panel display device body 21, and 26 is a pixel in the semiconductor device group 24 for driving the data side electrode. This is a data signal input terminal for taking in lighting data.

The features of the second embodiment configured as described above will be explained below.

According to this embodiment, as shown in FIG. 2, in the process of reading one scanning line's worth of data signals from the data signal input terminal 25 into the data side electrode driving semiconductor device group 24, one scanning line's worth of data signals are When the circuit 2o that detects the presence or absence of a pixel inversion signal detects that all the data signals for one scanning line are pixel off data, the circuit 2o detects the presence or absence of a pixel inversion signal, Give a signal so that no output is produced.

As described above, according to this embodiment, power consumption can be reduced by preventing unnecessary output from being output.

Next, a third embodiment will be described with reference to FIG.

In FIG. 3, 30 is a circuit for detecting the presence or absence of a pixel lighting signal in a data signal for one screen, 31 is a flat panel display device body, 32 is a group of semiconductor devices for driving scan-side electrodes of the flat panel display device body 31, 33 is a refresh pulse generation circuit, 3
4 is a group of semiconductor devices for driving data-side electrodes of the flat panel display main body 31; 35 is a semiconductor device group 34 for driving data-side electrodes;
This is a data signal input terminal for taking in pixel lighting data.

The characteristics of the low power consumption circuit of the third embodiment configured as described above will be explained below.

According to this embodiment, as shown in FIG. 3, in the process of sequentially reading display data from the data signal input terminal 35 into the data-side electrode driving semiconductor device group 34 and performing line-sequential driving for one screen, When the circuit 3o that detects the presence or absence of pixel lighting signals in the data signals for one screen detects that all the data signals for one screen are pixel off data, the refresh pulse generating circuit 33 By giving a signal so as not to output an output,
No power is consumed in the flat panel display device main body 31 and the scanning side electrode driving semiconductor device group 32.

As described above, according to this embodiment, power consumption can be reduced by preventing unnecessary output from occurring.

Next, a fourth embodiment will be described with reference to FIG.

Next, in FIG. 4, 40 is a flip-flop for detecting the presence or absence of a pixel lighting signal in the data signal for one scanning line, 41 is a transistor element for generating a pulse for driving the scanning side electrode, and 42 is a transistor element 41 43 is the KL display device main body, 44 is the KL
Semiconductor device group for driving scan-side electrodes of display device main body 43, 4
5 is a group of semiconductor devices for driving data-side electrodes of the KL display device main body 43, and 46 is a data signal input terminal for inputting pixel lighting data into the semiconductor device group 46 for driving data-side electrodes.

The characteristics of the low power consumption circuit of the fourth embodiment configured as described above will be explained below.

According to this embodiment, as shown in FIG. 4, in the process of reading one scanning line's worth of data signals from the data signal input terminal 46 into the data-side electrode driving semiconductor device group 45, the clock terminal of the flip-flop 4o receive the data signal,
If there is a lighting signal for even 1 bit in the data for one scanning line, the output of the flip-flop 4o is changed from 0 to 1. In the control signal generation circuit 42 for driving the transistor element 41 that generates the scanning side electrode driving pulse, 1
Semiconductor device group 4 for driving data-side electrodes transfers data for scanning lines.
6, the output signal of the flip-flop 40 is read, and if it is 1, a scan-side electrode drive pulse is generated, and if it is 0, a scan-side electrode drive pulse is not generated. The flip-flop 4o is cleared after determining whether to generate a scan-side electrode driving pulse, and its output becomes 0, and the content of the data for the next scan line is checked again. As described above, when all the data for one scanning line is pixel-off data, by not generating the scanning side electrode driving pulse, the scanning side electrode driving semiconductor device group 44 and the KL display device main body 43 can be Power consumption is eliminated.

As described above, according to this embodiment, power consumption can be reduced by omitting the generation of unnecessary refresh pulses.

Next, a sixth embodiment will be described with reference to FIG.

Next, in FIG. 5, 6o is a flip-flip for detecting the presence or absence of a pixel lighting signal in the data signal for one screen, and 51 is a transistor element for generating refresh pulses;
52 is a control signal generation circuit for driving the transistor element 61; 53 is a KL display device main body; 64 is an ICI; a group of semiconductor devices for driving scan-side electrodes of the display device main body 63; 65
56 is a data signal input terminal for inputting pixel lighting data to the data side electrode driving semiconductor device group 65 of the KL display device main body 53.

The features of the sixth embodiment configured as above will be described below.

According to this embodiment, as shown in FIG. 6, in the process of sequentially reading data signals for one screen from the data signal input terminal 56 to the data-side electrode driving semiconductor device group 55, receives a data signal for one screen, and if there is a lighting signal for even one bit in the data for one screen, the output of the flip-flop 50 is changed from 0 to 1. The control signal generation circuit 52 for driving the refresh pulse generation transistor element 61 reads the output signal of the flip-flop 5o after the display operation for one screen is completed, and if it is 1, a refresh pulse is generated, and if it is 0, it generates a refresh pulse. This is to avoid generating refresh pulses. The flip-flop 50 is cleared after determining whether or not to generate a refresh bar/l/swo, the output becomes 0, and the content of the data of the next screen hand is checked again.

In this way, in the KL display device, it is possible to reduce wasteful power consumption due to refresh drive when one screen is turned off.

According to the above-described embodiment, since unnecessary fresh pulses are not generated, power consumption can be reduced.

4th. As a result of application to the EL display device described in the fifth embodiment, the power consumption when the entire light is turned off can be reduced by 20 to 30%.

In addition, even when the background is off and the display parts such as characters and figures are lit, the average power consumption of the display is reduced because the power consumption of the non-display parts, such as the part between two figures between the lines of text, is reduced. can be reduced. As a result, it has become possible to make power supply equipment more compact.Although this embodiment has been explained using an XL display device as an example, it can also be applied to flat panel display devices other than EL display devices such as plasma display devices. can.

As described in detail, according to the present invention, by reducing wasted power when the lights are turned off, it is possible to reduce the power consumption of a flat surface water device.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a flat panel display device according to a first embodiment of the present invention, FIG. 2 is a block diagram of a flat panel display device according to a second embodiment of the present invention, and FIG. 3 is a block diagram of a flat panel display device according to a second embodiment of the present invention. FIG. 4 is a block diagram of a flat panel display device according to the first embodiment of the present invention applied to a KL display device, and FIG. 6 is a block diagram of a flat panel display device according to the first embodiment of the present invention. A block diagram of a flat panel display device according to an embodiment in which the third embodiment is applied to an ICL display device, and FIG. 6 is a block diagram of a conventional flat panel display device. 10.20...Circuit for detecting the presence or absence of a pixel lighting signal in the data signal for one scanning line, 3o...1
A circuit for detecting the presence or absence of a pixel lighting signal in a data signal for a screen, 11.21.31...Flat type display device main body, 41...Transistor for generating pulses for driving scanning side electrodes Element, 61...Transistor element for refresh pulse generation, 42...Control signal generation circuit for driving the transistor element 41, 52.
. . . Control signal generation circuit for driving the transistor element 61, 43.53. ICL display device main body, 13.23 . . . Pulse generation circuit for driving the scanning side electrode, 33.・・IJ fresh pulse generation time i1.
12, 22°32.44.54...Semiconductor device group for driving scanning side electrodes. Name of agent: Patent attorney Shigetaka Awano and one other person

Claims (3)

[Claims] (1) A flat panel display device main body, a semiconductor device group for driving scan side electrodes of the flat panel display device main body, a semiconductor device group for driving data side electrodes of the flat panel display device main body, and data for one scanning line. A flat panel display device comprising a circuit for detecting the presence or absence of a pixel lighting signal in a signal, and a scanning side electrode drive pulse generating circuit that operates only when the data signal for one scanning line includes a data signal for lighting a pixel. (2) A flat panel display device main body, a semiconductor device group for driving scan side electrodes of the flat panel display device main body, a semiconductor device group for driving data side electrodes of the flat panel display device main body, and a semiconductor device group for driving the data side electrodes of the flat panel display device main body, and a semiconductor device group for driving the data side electrodes of the flat panel display device main body, A flat panel display device comprising a circuit that outputs an enable signal when the data signal does not include a data signal for lighting a pixel, and a scanning side electrode drive pulse generation circuit that operates only when the enable signal is not output. (3) A flat panel display device main body, a semiconductor device group for driving the scanning side electrode of the flat panel display device main body, a semiconductor device group for driving the data side electrode of the flat panel display device main body, and a data signal for one screen. a circuit for detecting the presence or absence of a pixel lighting signal in the data signal; a scanning-side electrode drive pulse generation circuit that operates only when the circuit detects that a pixel lighting signal exists in the data signal for one screen; A flat panel display device comprising a refresh pulse generation circuit for applying a refresh pulse to all scanning electrodes of the flat panel display device main body after scanning is completed.