JPH1049096A - Display device, driving circuit and gradation display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gradation display technique by which the quality of a moving picture is prevented from being deteriorated. SOLUTION: This display device is provided with a part where plural sub- fields are arrayed in such turn that the display terms thereof become longer. Besides, they are arrayed so that the arraying number of the sub-field actuated last in a preceding field according to first gradation is set to be more delayed than the sub-field actuated first in a following field according to the second gradation within the field when the gradation is changed to the second gradation being one-level higher than the first gradation being at least the almost 1/2-level or the almost 1/4-level of the highest gradation from the first gradation between the adjacent fields at a display time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a gas discharge panel,
The present invention relates to a display technique for an EL display device, a fluorescent display tube, a liquid crystal display device, and the like.

[0002]

2. Description of the Related Art Conventionally, as a technique for displaying a gradation of an image on a matrix panel, for example, Kaji et al .: IEICE Technical Report on Image Engineering, Document No. IT72-45 (197)
3-03) (1973.3.12) There is a memory type gas discharge panel described in "Display of halftone moving image by AC type plasma display". In the prior art, for example, in an 8-bit gray scale, each subfield is divided into b0, b1, b2,
.., B7 (b0: subfield with the shortest display period (lowest subfield), b7: subfield with the longest display period (highest subfield)), arrangement order of subfields for representing gradation Is the order of b0, b1, b2,... B7, in which the display period gradually increases within one field time (for example, 1/60 second (s) (about 16.7 ms for NTSC television signals)). ing.

[0003]

In the above-described subfield arrangement order in the prior art, the moving picture quality is degraded, and the moving picture may appear to be grayed-out or the pixels may appear to be coarse.

The problems to be solved by the present invention will be described below with reference to FIGS. 2 to 5 by taking a gray scale display technique in the case of a gas discharge television as an example.

FIG. 2 is a diagram showing an example of a sectional structure of a cell of a three-electrode gas discharge panel. On the substrate 200, the first electrode (cathode) 220, Ba or Ni, are formed of a material such as LaB _6. On the other hand, a third electrode (display anode) 240 is formed on the face plate 210 by a printing technique or the like. The discharge space (display discharge space 250 and auxiliary discharge space 27)
0) is formed by a laminated structure of spacers and the like, and the second electrode (auxiliary anode) 230 is also provided at a predetermined position.

When a discharge (display discharge) occurs between the first electrode (cathode) 220 and the third electrode (display anode) 240, the gas (Xe or Ne-Xe, H) in the display discharge space 250 is generated.
e-Xe or other mixed gas) to generate ultraviolet rays,
0 is emitted and display is performed. An auxiliary discharge, which is a so-called pilot discharge, is generated between the first electrode 220 and the second electrode (auxiliary anode) 230. Whether or not this auxiliary discharge shifts to a display discharge between the first electrode 220 and the third electrode 240 depends on whether or not a pulse voltage is applied to the second electrode 230.

FIG. 3 shows a matrix type gas discharge panel 30.
It is a figure which shows the example of a connection structure of 0 electrode and an electrode lead wire.
The first and third electrodes of the cell 350 of the gas discharge panel are:
(In this example, and the number of electrode leads 480, K ₁ number from the top in the order of each lead, K _2, ... are the K ₄₈₀₎ the first electrode lead 310 laterally and the third electrode lead wire 3
40 (in this example, the number of electrode leads at 480, A _1, A ₂ from the top the number of each lead wire, ... is set to A ₄₈₀₎ is connected to, the second electrode second electrode in the longitudinal direction Lead wires (auxiliary anode lead wires) 320 and 330 are connected.

FIG. 4 shows a waveform of a voltage applied to the electrodes.

In FIG. 4, V _K denotes a first electrode lead wire 3.
A waveform 400 of a voltage applied to the first electrode via 10 and a pulse 400 for addressing one line in the matrix panel (hereinafter, referred to as a first electrode address pulse).
In FIG. 4, the pulse width of the first electrode address pulse is equal to the time width Δ (= 1H / number of gray scale bits, H: horizontal scanning period) assigned to address one line. . For example, when a television signal is displayed in 8-bit gradation (256 gradations), the time width Δ is Δ
≒ 7.9 μs.

In FIG. 4, Vs is a pulse (second electrode pulse) 41 applied to the second electrode via the second electrode lead wire.
0 is a voltage waveform. The second electrode pulse 410 has a smaller pulse width than the first electrode address pulse 400,
It is located behind the time width Δ. The second electrode pulse may or may not be present depending on the content of the television signal.

Further, _VA is applied to the third electrode via the third electrode lead wire.
5 is a waveform of a voltage applied to an electrode. For the same line number of the first electrode lead and the third electrode lead,
The voltage of the pulse 420 is applied to the first electrode address pulse 400
Immediately after, the voltage is continuously applied to the third electrode a number of times corresponding to the display period of the subfield.

Next, the discharge between the electrodes will be described with reference to periods I, II, and III in FIG.

When the voltage of the address pulse 400 is applied to the first electrode, a discharge, that is, an auxiliary discharge occurs between the first electrode and the second electrode in a period I. This auxiliary discharge occurs in the auxiliary discharge space 270 (FIG. 2). Since there is no phosphor on the wall surface of the auxiliary discharge space 270 and the auxiliary discharge space 270 is located at a position hidden from the front side of the panel, the auxiliary discharge has little effect on display image quality.

Next, during the period II in which the voltage of the pulse 410 is applied to the second electrode, the potential difference between the first electrode and the second electrode is reduced, so that the discharge between the first electrode and the second electrode is reduced. Stops. However, as described above, since the pilot discharge (auxiliary discharge) has already been performed in the period I, the first discharge is performed in the period II.
Many space charges exist near the electrodes. Therefore, a new discharge, that is, a display discharge occurs between the first electrode and the third electrode. The transition of the discharge from the second electrode to the third electrode in this manner is referred to herein as switching. When this switching is performed, a large number of charged particles are generated in a discharge path (display discharge space 250) between the first electrode and the third electrode.

Next, in period III, first, the third electrode
The voltage of the pulse 420 having a small width is applied. Period II above
As a result, a large amount of charged particles are present in the display discharge space 250, and a discharge is generated between the first electrode and the third electrode by the voltage of the pulse 420. Due to this discharge, charged particles are further generated in the display discharge space 250, and the discharge is caused by the voltage of the next pulse 430. Thus, in the period III, this discharge continues during the period in which the pulse voltage is continuously applied. This is called a pulse memory. This discharge causes the phosphor 260 to emit light and display is performed. This discharge stops even when the pulse voltage is continuously applied, when a new voltage is applied to the first electrode.

In the case where the panel does not emit light for display, FIG.
Pulse 410 is not applied to the second electrode. In this case, the switching is not performed and the first
No discharge occurs between the electrode and the third electrode. Therefore, the number of charged particles in the display discharge space 250 is small. Therefore, the third
Even if the voltages of the pulses 420 and 430 are applied to the electrodes, no discharge occurs and the phosphor 260 does not emit light. As described above, the discharge between the first and third electrodes can be controlled by controlling the presence or absence of the pulse 410 of the second electrode, and the display light emission of the panel can be controlled.

Next, with reference to FIG. 5, an example of an 8-bit gray scale (256 gray scale) image display in the case of a gas discharge panel will be described.

FIG. 5 is a diagram showing an example of the waveform V _{K of} the voltage applied to the first electrode and the waveform _VA of the voltage applied to the third electrode during one field. A voltage of eight pulses 400 corresponding to the subfield is applied to the first electrode during one field. Each of the eight pulses 400 is referred to as an address pulse in each subfield b0, b1, b2,. As shown in FIGS. 4 and 5, the voltage of the pulse 420 applied to the third electrode is repeatedly applied immediately after the application of the address pulse 400, and ends before the next subfield address pulse 400 comes. Pulse 420 is
In each of the subfields b0, b1, b2,..., A display period corresponding to each subfield is formed.

Each subfield b0, b1, b2,... B
7 is 1: 2: 4: 8:...: 128 corresponding to the subfields b0, b1, b2,. The 256 gray scales of the hexadecimal code are configured. This third
It is determined whether or not the panel is to be discharge-displayed by the voltage of the pulse train 420 applied to the electrodes.
.. In the period corresponding to the address pulse 400 within the second electrode pulse (410 in FIG. 4).

In a conventional gradation display, as shown in FIG.
From the lowermost (shortest display period) subfield b0 to progressively higher (longer display period) subfields,
That is, they are arranged in the order of b0, b1, b2,.
In this case, as shown in Table 1, when the gradation level changes by one level between level 127 and level 128, when the level is 127, display is performed in seven subfields b0 to b6, When the level is 128, display is performed only in the subfield b7.

[0021]

[Table 1]

As is apparent from FIG. 5, in the case of the conventional technique, the level 127 is displayed in a certain field,
When displaying the level 128 in the next field, the time width of one field (about 16.7
ms), there is a period in which the display unit does not emit light at all. Especially in the case of moving images, the image quality is significantly degraded due to this.
The gradation appears to be dropped, or the pixels appear to be coarse.

Table 2 shows the case of another gradation level. As shown in Table 2, when the gray level changes between adjacent fields, when the gray level changes between level 63 and level 64, when the level changes between level 31 and level 32, or when level 15 and level When it changes between 16,
Further, like the change between the level 191 and the level 192, when the level changes between the level 63 and the level 64 with reference to the level 128 of the subfield b7, a long non-light emitting period is generated in the display unit. There is image quality degradation for moving images. This deterioration in image quality is remarkable in the case of a display with high luminance.
If the brightness is low, it is difficult to observe.

[0024]

[Table 2]

As described above, in the above prior art,
Since the order of the subfields is the order of b0, b1,... B7, the image quality of the moving image is degraded.

An object of the present invention is to provide a gradation display technique which does not cause such image quality deterioration.

[0027]

In order to achieve the above-mentioned object, according to the present invention, as a basic configuration, (1)
The arrangement of a plurality of subfields in a field has an arrangement portion in which the display period of the subfield is gradually longer, and at the time of display operation, between adjacent fields, the gradation is at least the highest gradation. About 1/2 level or about 1
When changing from the 階 調 level first gradation to the second gradation that is one level higher than the first gradation, the last subfield that operates in the preceding field corresponding to the first gradation is the 2
The configuration is such that the arrangement order in the field is later than the subfield that operates first in the subsequent field corresponding to the gradation. In addition, (2) an arrangement of a plurality of subfields in a field includes an arrangement portion in which the display period of the subfield is longer and an arrangement portion in which the display period of the subfield is shorter. Between adjacent fields, the gray level changes from a first gray level that is at least approximately 1/2 level or approximately 1/4 level of the highest gray level to a second gray level that is one level higher than the first gray level. The sub-field corresponding to the first gradation and operating last in the preceding field is more than the sub-field corresponding to the second gradation and operating first in the succeeding field. On the rear side. Further, (3) the arrangement of (3) an arrangement of a plurality of subfields in a field has an arrangement portion in which the display period of the subfield is longer and an arrangement portion in which the display period is shorter, and At this time, between adjacent fields, the gray level is at least about 1/2 level or about 1/4 level of the highest gray level.
When changing from the gray level to the second gray level which is one level higher than the first gray level, the display period end time of the last operation subfield in the preceding field and the display period start time of the first operation subfield in the subsequent field Time interval between is 1
It is configured to be less than the field.

A plurality of subfields in the field
The arrangement configuration in which the display period has a portion arranged in the order of longer and a portion arranged in the order of the shorter, the subfields of each display period including the subfield of the longest display period are dispersed in each field. And arrange them. The dispersed arrangement is a display period of a sub-field which is operated last among sub-fields corresponding to the gray level before the level change in the preceding field, especially when the gray level of the gray level is changed between adjacent fields. The transition time from the end point to the display period start point of the first operation subfield of the subfields corresponding to the gradation level after the level change in the subsequent field is shortened.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIGS.

As apparent from the above, in order to improve the image quality deterioration, basically, a plurality of subfields may be arranged in an order in which display periods are dispersed. In this arrangement, even if the level 127 and the level 128 in the above Table 1 change from field to field, 1
The light emission period always exists within the field period. Hereinafter, the plurality of subfields b0, b1, b2
.. B7 are used, and the subfields are arranged on both sides of the uppermost subfield (the longest display period subfield (b7 in the above example)) and subfields b5 and b6 of a shorter display period. Configuration example of a distributed subfield array in which the uppermost subfield b7 is arranged substantially at the center of the field (FIGS. 1 and 6).
And a configuration example of the gas discharge television using the same (FIG. 7).

FIG. 1 shows a configuration example of a subfield arrangement according to the present invention. A sub-field in one field b1, b3, b5, b7, b6, b4, b2, when arranged in the order of b0, is applied to the voltage waveform V _K and the third electrode to be applied to the first electrode An example of a voltage waveform _VA is shown. The display period of each subfield is the same as that of the prior art shown in FIG. The number of pulses 420 applied to the third electrode also corresponds to the display period of each subfield, and is the same as in the case of the prior art in FIG. In the subfield arrangement of FIG. 1 as well, a change between subfields with low gradation levels, such as a change between b0 and b1 at the time of field switching, is a change in a dark display level range. Even if the non-light-emitting time becomes long, the image quality does not deteriorate remarkably.

FIG. 6 shows another example of the subfield arrangement according to the present invention. That is, subfields within one field are represented by b0, b2, b4, b6, b7, b
5, in a case arranged in the order of b3, b1, showing an example of a voltage waveform V _A applied to the voltage waveform V _K and the third electrode to be applied to the first electrode. In this case, as in the case of the embodiment of FIG. 1, the display period of each subfield is the same as that of each subfield of FIG.

FIG. 7 shows an embodiment of the apparatus of the present invention, and shows a specific example of the structure of a gas discharge television. Video signals 810, 820, 830 separated into R, G, B color signals
Are converted from analog signals to digital signals by A / D converters 840, 850, and 860, respectively, and stored in the frame memory 870. The frame memory 8
The readout of the signal from 70 is performed by a dedicated readout ROM 9.
00, it is performed at a timing that matches the time of the subfield array of the present invention. The ROM 900 is operated by a counter 890 that counts a clock signal 880. The counter 890 outputs a V signal (vertical synchronization signal) of a television signal or an H signal (horizontal synchronization signal) as necessary.
Reset using. The signals read from the frame memory 870 are input to the shift registers 1010 and 1030, where the signals are subjected to serial-parallel conversion, and then converted into high-voltage signals necessary for driving the panel 800 by the second electrode drivers 1020 and 1040. Then, it is input to the second electrode of the panel. In the embodiment shown in FIG. 7, the device configuration is a two-row simultaneous driving system in which the second electrode is driven separately in the upper half and the lower half of the panel. It is provided in.

On the other hand, a signal input to the first electrode (FIG. 1,
The logic signal V _K in FIG. 6) is generated by the ROM 920 and is shifted by 1H in the shift register 98.
0, 970, and after serial-parallel conversion, the signals are converted into high-voltage signals by the drivers 1000, 990 and input to the first electrode of the panel.

The signal input to the third electrode (FIG. 1,
The logic signal V _A in FIG. 6) is generated by the ROM 910 and is shifted by 1H in a shift register 93.
0, 940, and after serial-parallel conversion, converted into a high voltage signal by drivers 950, 960 and input to the third electrode of the panel.

Although the embodiments of the present invention have been described with reference to a gas discharge television, the scope of the present invention is not limited to this.
In addition, for example, an EL display device, a liquid crystal display device, a fluorescent display tube, and the like, such as a matrix panel that digitally performs luminance modulation by a pulse width or the number of pulses are also included.

[0037]

According to the present invention, it is possible to improve the image quality of moving images under a simple configuration.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of a subfield arrangement according to the present invention.

FIG. 2 is a sectional view of a cell of the gas discharge panel.

FIG. 3 is a diagram showing wiring of a gas discharge panel.

FIG. 4 is a diagram illustrating driving of a gas discharge panel.

FIG. 5 is an explanatory diagram of a conventional gradation display technique.

FIG. 6 is a diagram showing another embodiment of a subfield arrangement according to the present invention.

FIG. 7 is a diagram showing one embodiment of the apparatus of the present invention.

[Explanation of symbols]

220: first electrode, 230: second electrode, 240: third electrode, 250: display discharge space, 270: auxiliary discharge space, 400: first electrode address pulse.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinichi Shinada 1-280 Koigakubo, Kokubunji-shi, Tokyo Co., Ltd. Inside the Central Research Laboratory, Hitachi, Ltd. In the Central Research Laboratory (72) Inventor F. C. Curzon 1-280 Koigakubo, Kokubunji-shi, Tokyo Inside the Hitachi, Ltd. Central Research Laboratory Co., Ltd.

Claims (18)

[Claims] 1. A display device for displaying an image with gradation using a subfield, wherein the plurality of subfields has an arrangement portion arranged in the order of increasing the display period of the subfield, and a display operation is performed. Between adjacent fields, the gray level is at least about 1/2 level or about 1/4 level of the highest gray level.
When changing from the gray level to the second gray level which is higher than the first gray level by one level, the sub-field corresponding to the first gray level and operating last in the preceding field corresponds to the second gray level. Than the first subfield that operates in a subsequent field,
A display device characterized by being arranged such that the arrangement order in a field is on the rear side. 2. A display device for displaying a gradation image using subfields, wherein a plurality of subfields are arranged in an order in which display periods of the subfields are longer and an array in which a plurality of subfields are arranged in a shorter order. And at the time of display operation, between adjacent fields, the gradation is at least approximately 1/1 / the highest gradation.
When changing from the first gray level of two levels or approximately 1/4 level to the second gray level which is one level higher than the first gray level, the display period of the last operation subfield in the preceding field ends and the subsequent field ends. Wherein the time interval from the start of the display period of the first operation sub-field is less than one field. 3. A display device for displaying an image with gradation using subfields, wherein a plurality of subfields are arranged in an order in which display periods of the subfields are longer and an array in which a plurality of subfields are arranged in a shorter order. And at the time of display operation, between adjacent fields, the gradation is at least approximately 1/1 / the highest gradation.
When changing from the first gray level of two levels or approximately 1/4 level to the second gray level one level higher than the first gray level,
The subfield which operates last in the preceding field corresponding to the gray level is arranged rearward in the field than the subfield which operates first in the subsequent field corresponding to the second gray level. A display device characterized by being arranged in a matrix. 4. A display device for displaying an image with gradation using subfields, wherein a plurality of subfields are arranged in an order in which display periods of the subfields are longer and an array in which a plurality of subfields are arranged in a shorter order. And a sub-field of the longest display period is arranged between the two arrangement portions, and the gray level between adjacent fields is at least approximately レ ベ ル of the highest gray level during a display operation. Alternatively, when changing from the approximately 1/4 level first gradation to the second gradation that is one level higher than the first gradation,
The subfield that operates last in the preceding field corresponding to the first grayscale has a rearrangement order in the field behind the subfield that operates first in the subsequent field corresponding to the second grayscale. A display device characterized by being arranged so that 5. A display device for displaying an image with gradation using subfields, wherein a plurality of subfields have a portion arranged in order of increasing display period and a portion arranged in order of decreasing display period. And during a display operation, the gray level is at least approximately 1/1 / the highest gray level between adjacent fields.
When changing between the first gray level of two levels and the second gray level different from the first gray level by one level, a subfield corresponding to the first gray level and operating last in the preceding field is: A display device characterized by being arranged such that the arrangement order in a field is later than a subfield that operates first in a subsequent field corresponding to the second gradation. 6. A display device for displaying an image with gradation using subfields, wherein a plurality of subfields having a display period ratio of 1, ² , 22 ² , 2 ³ ,. The plurality of sub-fields have an arrangement portion arranged in the order of increasing the display period of the sub-field and an arrangement portion arranged in the order of decreasing the display period of the sub-field, and the sub-field of the longest display period Are arranged, and in a display operation, between adjacent fields, the gray level is at least about 1/2 level or about 1/4 level of the highest gray level to 1 level higher than the first gray level. When changing to the second gradation higher in level, the last subfield that operates in the preceding field corresponding to the first gradation is:
A display device characterized by being arranged such that the arrangement order in a field is later than a subfield that operates first in a subsequent field corresponding to the second gradation. 7. A display device for displaying a gradation image by causing a matrix panel to emit light by using a display period of a subfield, and a memory means for holding an image input signal, and reading a first signal from the memory means. The control means and the sub-fields are arranged so as to have a portion arranged in the order of increasing the display period and a portion arranged in the order of decreasing the display period. At least changes from the first gray level which is approximately 1/2 level or approximately 1/4 level of the highest gray level to the second gray level which is one level higher than the first gray level. A second arrangement is such that the time interval between the end of the display period of the subfield and the start of the display period of the first active subfield in the subsequent field is less than one field. Array information output means for outputting an information signal as a signal; first drive signal output means for forming and outputting a first drive signal for driving a first electrode of the matrix panel from the first signal; Second drive signal output means for forming and outputting a second drive signal for driving a second electrode of the matrix panel from the information signal; and a panel unit based on the second drive signal with the first drive signal And a matrix panel for controlling the light emission of the device, and displaying a gradation image corresponding to the light emission period of the controlled light emission on the panel unit. 8. A display device for displaying an image having a gradation by causing a matrix panel to emit light by using a display period of a subfield, and a memory means for holding an image input signal, and reading a first signal from the memory means. The control means and the sub-fields are arranged so as to have a portion arranged in the order of increasing the display period and a portion arranged in the order of decreasing the display period. At least changes from the first gray level of approximately 1/2 level or approximately 1/4 level of the highest gray level to the second gray level which is one level higher than the first gray level. The sub-field corresponding to the last operation in the preceding field corresponds to the second gradation, and the arrangement order in the field is later than the sub-field corresponding to the first operation in the subsequent field. Array information output means for outputting an information signal as a second signal arranged in a matrix; and a first signal for forming and outputting a first drive signal for driving a first electrode of the matrix panel from the first signal. Drive signal output means for forming and outputting a second drive signal for driving a second electrode of the matrix panel from the information signal; and a second drive signal output means for outputting the second drive signal based on the first drive signal. 2. A display device, comprising: a matrix panel in which light emission of a panel portion is controlled by the drive signal of No. 2 and a gradation image corresponding to a light emission period of the controlled light emission is displayed on the panel portion. 9. A display device for displaying a gradation image by causing a matrix panel to emit light by using a display period of a subfield, and a memory means for holding an image input signal, and reading a first signal from the memory means. Control means, and the subfields are arranged so as to have an arrangement portion in which the display period is longer and an arrangement portion in which the display period is shorter, and the subfield of the longest display period is arranged between both arrangement portions; and In the display operation, between adjacent fields, the gray level is at least one level higher than the first gray level, which is at least about 1/2 level or about 1/4 level of the highest gray level. When changing to two gray levels, the last active subfield in the preceding field corresponding to the first gray level is more active than the first active subfield in the subsequent field corresponding to the second gray level. Array information output means for outputting an information signal as a second signal arranged so that the arrangement order in the field is rearward, and driving the first electrode of the matrix panel from the first signal First drive signal output means for forming and outputting a first drive signal to be driven, and a second drive signal for forming and outputting a second drive signal for driving a second electrode of the matrix panel from the information signal Output means; and a matrix panel for controlling light emission of the panel unit by the second drive signal by the first drive signal, and displaying on the panel unit a gradation image corresponding to a light emission period of the controlled light emission. A display device comprising: 10. A display device for displaying an image having a gradation by causing a matrix panel to emit light using a display period of a subfield, based on a signal read out from memory means holding an image input signal in accordance with the subfield. First drive signal output means for forming and outputting a first drive signal for driving the first electrode of the matrix panel; and a portion in which a plurality of subfields are arranged in the order of increasing the display period of the subfield. And at least a half level or a quarter level of the highest gray level between adjacent fields during a display operation. Changes from the first gradation to the second gradation one level higher than the first gradation, the sub-field corresponding to the first gradation and operating last in the preceding field. Array information output means for outputting an information signal which is arranged so that the arrangement order in the field is later than the subfield which operates first in the subsequent field corresponding to the second gradation. A second drive signal output unit for forming and outputting a second drive signal for driving a second electrode of the matrix panel from the information signal; and a panel unit for each subfield by using the first drive signal. A portion capable of emitting light by the second drive signal;
And a matrix panel for controlling the light emission period of the light emission by the second drive signal and displaying an image of a gradation corresponding to the light emission period. Display device. 11. A display device for displaying a gradation image by causing a matrix panel to emit light by using a display period of a subfield, wherein a first electrode for driving a first electrode of the matrix panel based on an image input signal. A first means for forming a drive signal; and a plurality of subfields arranged so as to have a portion arranged in the order of increasing the display period of the subfield and a portion arranged in the order of decreasing the display period of the subfield. At this time, between adjacent fields, the second gray level is at least one level higher than the first gray level, which is at least approximately 1/2 level or approximately 1/4 level of the highest gray level. The time interval between the end of the display period of the last active subfield in the preceding field and the start of the display period of the first active subfield in the succeeding field is one Second means for forming a second drive signal for driving a second electrode of the matrix panel from an information signal arranged so as to be less than the first drive signal, and the second drive using the first drive signal A display device, comprising: a matrix panel in which light emission of a panel portion is controlled by a signal, and a gradation image corresponding to a light emission period of the controlled light emission is displayed on the panel portion. 12. A display device for displaying a gradation image by causing a matrix panel to emit light using a display period of a subfield, wherein a first electrode for driving a first electrode of the matrix panel based on an image input signal. A first means for forming a drive signal; and a plurality of subfields arranged so as to have a portion arranged in the order of increasing the display period of the subfield and a portion arranged in the order of decreasing the display period of the subfield. At this time, between adjacent fields, the second gray level is at least one level higher than the first gray level, which is at least approximately 1/2 level or approximately 1/4 level of the highest gray level. , The last active subfield in the preceding field corresponding to the first gray level is more active than the first active subfield in the subsequent field corresponding to the second gray level. Second means for forming a second drive signal for driving a second electrode of the matrix panel from information signals arranged such that the arrangement order in the field is rearward; and the first drive A matrix panel for controlling light emission of the panel unit by the second drive signal by a signal, and displaying an image of a gradation corresponding to a light emission period of the controlled light emission on the panel unit. Display device. 13. A display device for driving a display unit using a display period of a subfield to display an image having a gradation, wherein a first electrode for driving a first electrode of the display unit based on an image input signal. A drive signal is formed, and the plurality of subfields are arranged so as to have a part arranged in the order of increasing the display period of the subfield and a part arranged in the order of decreasing the length of the subfield, and are adjacent to each other during the display operation. Between the combined fields, the gray level changes from the first gray level which is at least approximately 1/2 level or approximately 1/4 level of the highest gray level to the second gray level which is one level higher than the first gray level. Information that is arranged such that the time interval between the end of the display period of the last operation subfield in the preceding field and the start of the display period of the first operation subfield in the succeeding field is less than one field. Means for forming a second drive signal for driving a second electrode of the display unit from the signal; and driving of the display unit by the second drive signal is controlled by the first drive signal. A display device, comprising: a display unit that displays an image having a gradation corresponding to a state. 14. A display device for driving a display unit using a display period of a subfield to display an image having a gray scale, wherein a first electrode for driving a first electrode of the display unit based on an image input signal. A drive signal is formed, and the plurality of subfields are arranged so as to have a part arranged in the order of increasing the display period of the subfield and a part arranged in the order of decreasing the length of the subfield, and are adjacent to each other during the display operation. Between the combined fields, the gray level changes from the first gray level which is at least approximately 1/2 level or approximately 1/4 level of the highest gray level to the second gray level which is one level higher than the first gray level. At this time, the subfield that operates last in the preceding field corresponding to the first grayscale has a lower arrangement order in the field than the subfield that operates first in the subsequent field corresponding to the second grayscale. On the back side Means for forming a second drive signal for driving a second electrode of the display unit from the information signals arranged as described above, and the first drive signal is used to generate a second drive signal for the display unit by the second drive signal. A display device, comprising: a display unit whose driving is controlled and which displays an image having a gradation corresponding to the driving state. 15. A display device for driving a display unit by using a display period of a subfield to display an image with gradation, wherein a first electrode for driving a first electrode of the display unit based on an image input signal. A drive signal is formed, and the plurality of subfields have a portion arranged in the order of increasing display period and a portion arranged in the order of decreasing display period, and the sub-field of the longest display period is provided between the two portions. Fields are arranged , and at the time of display operation, between adjacent fields, the gray level is at least from the first gray level of approximately 1/2 level or approximately 1/4 level of the highest gray level to the first level. When changing to the second gray level one level higher than the gray level, the sub-field corresponding to the first gray level and operating last in the preceding field corresponds to the second gray level and operates first in the subsequent field. Fees rather than subfields Means for forming a second drive signal for driving a second electrode of the display unit from information signals arranged such that the arrangement order in the field is rearward; A display unit that controls driving of the display unit by a second drive signal and displays a grayscale image corresponding to the driving state. 16. A driving circuit of a display device for displaying a gradation image by causing a matrix panel to emit light in a display period of a subfield, a memory means for holding an image input signal, and a driving means for driving an electrode of the matrix panel. A first signal for forming one drive signal, wherein the plurality of subfields are arranged so as to have a portion arranged in the order of increasing the display period of the subfield and a portion arranged in the order of decreasing the display period of the subfield. In the display operation, the gray scale between adjacent fields is at least approximately の of the highest gray scale.
A second level different from the first level by a level different from the first level;
When changing to a gray level, the last active subfield in the preceding field corresponding to the first gray level is more active than the first active subfield in the subsequent field corresponding to the second gray level. An array information output unit for outputting an information signal arranged such that an array order is rearward, and a second drive signal for driving a second electrode of the matrix panel from the memory unit. Control means for reading out a second signal for the subfield in accordance with the subfield. 17. A driving circuit for driving a display section by a subfield, a memory means for holding an image input signal, and a first driving signal for forming a first driving signal for driving a first electrode of the display section. Wherein the plurality of subfields have a first arrangement portion arranged in the order of increasing the display period of the subfield and a second arrangement portion arranged in the order of decreasing the display period of the subfield. A subfield of the longest display period is arranged between the arrangement portion and the second arrangement portion, and at the time of a display operation, the gradation between adjacent fields is at least approximately 1/1 / the highest gradation. When changing from the first gray level of two levels or approximately 1/4 level to the second gray level one level higher than the first gray level, the sub-actor corresponding to the first gray level and operating last in the preceding field Field corresponds to the second gradation An array information output unit that outputs an information signal that is arranged so that the arrangement order in the field is later than the subfield that operates first in the subsequent field; and Control means for reading a second signal for forming a second drive signal for driving the two electrodes in accordance with the subfield. 18. A display apparatus comprising: a plurality of subfields arranged in a field so as to have an arrangement portion arranged in the order of increasing the display period of the subfield and an arrangement portion arranged in the order of decreasing the display period; At least, a first field corresponding to at least a half level or a quarter level of the highest gray level and a level adjacent to the first field and one level higher than the first gray level Between the second field corresponding to the higher second gray level, the last active subfield in the first field has a higher value in the field than the first active subfield in the second field. Based on the information signals arranged so that the arrangement order is on the rear side, a display unit driving signal corresponding to the information signal is formed, and the display time of the display unit is controlled by the display unit driving signal, and the gradation is adjusted. An image Gradation display method is characterized in that so as to display on the display unit.