JP2908411B2 - Display device, drive circuit and gradation display method - Google Patents

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 in the prior art, the image quality of a moving image deteriorates, and the moving image appears to be grayed-out or the pixels 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 of the subfields b0, b1, b2... B7
, The ratio of the number of pulses of the pulse 420 in each subfield to the subfields b0, b1, b2,.
If the ratio is 2: 4: 8:...: 128, this combination constitutes 256 gray levels of the binary code of the image. It is determined whether or not the panel is to be subjected to display discharge by the voltage of the pulse 420 applied to the third electrode during the period corresponding to the address pulse 400 in each of the subfields b0, b1, b2,. 410).

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 object, according to the present invention, there are provided: (1) a plurality of subfields within one field period;
It has a portion in which three or more subfields are arranged in the order of increasing the number of display pulses assigned to each subfield, and a portion in which three or more subfields are arranged in the order of decreasing number . The display pal within the range
Are arranged so as to include the sub-fields having the largest number of pixels, and at the time of display operation, between adjacent fields, the gray level is at least approximately 1/2 level or approximately 1 level of the maximum gray level.
When the level changes from the first gray level of / 4 level to the second gray level that is one level higher than the first gray level, the second gray level becomes the active state for display among the arranged subfields. And the end of the display period of the last operation subfield in the preceding field and the start of the display period of the one operation subfield in the succeeding field. Are arranged so that the time interval between them is less than one field.

(2) A plurality of subfields within one field period are reduced to a portion where three or more subfields are arranged in the order of increasing the number of display pulses assigned to each subfield. 3 or more sub fees in order
Where the field is arranged and within
Includes subfields with the largest number of display pulses
In the display operation, the gray level is at least approximately 1/2 level or approximately 1/4 level of the highest gray level and lower than the first gray level between adjacent fields during the display operation. When the second gray level changes to the second gray level which is higher by one level, the second gray level is activated for display in the arranged subfields.
Is formed in accordance with the number of display pulses assigned to one subfield, and the subfield which operates last in the preceding field of the first gradation is in the succeeding field of the second gradation. Are arranged in such a way that the arrangement order in the field is later than the one sub-field operated by.

[0029] (3) 1 a plurality of sub-fields in a field period, a first sequence of two or more sub-fields in order of the number is a number of display pulses allocated to each subfield is <br/> sequence Three or more parts
Subfields are arranged and a second sequence portion that is arranged, together with sequence portions of at least the first sub-field number most of display pulses between the both sequences portion
In this case, a portion in which the number of the display pulses increases is formed.
In the display operation, the gray level is at least one-half or one-fourth of the highest gray level between adjacent fields. When the second gray level changes to a higher level, the second gray level becomes active for display in the arranged subfields.
A subfield that is formed corresponding to the number of display pulses allocated to one subfield and that operates last in the preceding field of the first gray scale is used in the succeeding field of the second gray scale. The subfields are arranged so that the arrangement order in the field is later than the one subfield that operates. Also, multiple sub-fields within one field period
Are three or more in the order of increasing the number of display pulses.
The first array part where the subfields are arrayed and less
The second arrangement in which two or more subfields are arranged in
And an array portion having the display portion between the two array portions.
Subfields with the largest number of
The number of the display pulses decreases with the arrangement portion of 2.
Arranged so as to form a sequential part, and at the time of display operation,
Gradients between adjacent fields must be at least
The first gradation of approximately 1/2 level or approximately 1/4 level of the key
Changes from the first gradation to the second gradation one level higher than the first gradation.
A subfield in which the second gradation forms the first gradation
More display pulses assigned than any of
It is formed by the operation of one subfield, and is formed by the first gradation.
The last operated subfield in the preceding field is
The one sub-actuator operating in a subsequent field of the second gradation
Arrangement order within the field is later than the field
Are arranged as follows.

(4) A plurality of subfields formed within one field period have a portion arranged in the order of increasing the number of display pulses assigned to each subfield and a portion arranged in the order of decreasing number of display pulses. In the display operation, the gray scale between adjacent fields is
At least when the first gray level of approximately 1/2 level or approximately 1/4 level of the highest gray level changes to the second gray level which is higher by one level than the first gray level, the second gray level becomes the first gray level. It is formed by the operation of one subfield in which the number of assigned display pulses is larger than that of any of the subfields forming the gray scale, and the last operated subfield in the preceding field of the first gray scale is Are arranged such that the arrangement order in the field is later than the one subfield operating in the subsequent field of the second gradation.

The above-described sub-field arrangement disperses the positions of the operation sub-fields (sub-fields in which the display section is driven by the display pulses to bring the display section into a display state) particularly at the gray level of the halftone level. In the meantime, from the end of the display period of the sub-field corresponding to the gray level before the level change in the preceding field, the sub-field corresponding to the gray level after the level change in the subsequent field The time required to start the display period of the first operation subfield is shortened.

[0032]

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 is apparent from the above, in order to improve the image quality degradation, a plurality of sub-fields are basically divided into a display period in which a predetermined number of display pulses are allocated in one field period. What is necessary is just to arrange in the order which performs. In such an arrangement, a light emission period always exists within one field period even if the level 127 and the level 128 in Table 1 change for each field. Hereinafter, the plurality of sub-fields b0,
In the case where b1, b2,..., b7 are used, the subfields are placed next to the uppermost subfield (the subfield of the longest display period (b7 in the above example)) and the subfields b5 and b6 of the shorter display period. , And the uppermost subfield b7 is arranged substantially at the center of the field.
FIG. 6) and a configuration example of the gas discharge television using the same (FIG. 7) will be described.

FIG. 1 shows an example of the configuration of a subfield arrangement according to the present invention. Subfields in one field are represented by b1, b3, b5, b7, b6, b4, b2, b0.
And an example of a voltage waveform V _K applied to the first electrode and a voltage waveform V _A applied to the third electrode. The display period of each subfield is the same as that of the prior art shown in FIG. The number of pulses 420 (pulses for display) applied to the third electrode and assigned to each subfield also corresponds to the display period of each subfield. Is the same as 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 due to a change in a dark display level area. ,
Even if the non-light emitting time is long, the deterioration of the image quality is not noticeable.

FIG. 6 shows another example of a 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 in the prior art of FIG.

FIG. 7 shows an embodiment of the apparatus according to the present invention, showing 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.

A 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.

[0040]

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 Continuing on the front page (72) Shinichi Shinada, Inventor 1-280 Koikurakubo, Kokubunji-shi, Tokyo Inside the Hitachi, Ltd. Central Research Laboratory Co., Ltd. (72) Inventor F.S. C. Curzon 1-280 Koikurakubo, Kokubunji-shi, Tokyo Inside the Central Research Laboratory, Hitachi, Ltd. (72) Inventor Kuni Kitagawa 3681 Hayano, Mobara-shi, Chiba Pref. Hitachi Device Engineering Co., Ltd. (56) References (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) G09G 3/00-3/38

Claims (7)

(57) [Claims] 1. A display device for displaying an image with gradation by subfields, wherein a plurality of subfields within one field period are divided into three or more in the order of increasing the number of display pulses assigned to each subfield . The display pulse has a portion in which subfields are arranged and a portion in which three or more subfields are arranged in decreasing order, and the number of the display pulses within the range of both portions.
Are arranged so as to include the largest number of subfields , and at the time of display operation, the gradation between adjacent fields is
When the first gray level of at least approximately 1/2 level or approximately 1/4 level of the highest gray level changes to the second gray level which is higher by one level than the first gray level, the second gray levels are arranged. The number of display pulses assigned to one of the sub-fields that are activated for display among the sub-fields that are displayed, and are formed at the end of the display period of the last operation sub-field in the preceding field and in the subsequent field. Wherein the time interval from the start of the display period of the one operation subfield is less than one field. 2. A display device for displaying an image having a gradation by a subfield, wherein a plurality of subfields within one field period are divided into three or more in the order of increasing the number of display pulses assigned to each subfield . The display pulse has a portion in which subfields are arranged and a portion in which three or more subfields are arranged in decreasing order, and the number of the display pulses within the range of both portions.
Are arranged so as to include the largest number of subfields , and at the time of display operation, the gradation between adjacent fields is
When the first gray level of at least approximately 1/2 level or approximately 1/4 level of the highest gray level changes to the second gray level which is higher by one level than the first gray level, the second gray levels are arranged. The number of display pulses assigned to one of the subfields that are activated for display among the subfields that have been activated for display is formed, and the last activated subfield in the preceding field of the first gradation is A display device arranged in such a manner that the arrangement order in the field is later than the one sub-field operated in the subsequent field of the second gradation. 3. A display device for displaying an image having a gradation by subfield, 1,2,2 ² number as a relative value of the display pulse to be allocated to the subfield, 2 ^3, ... a plurality of sub A field within the field, the plurality of subfields comprising:
Two or more subfields are arranged in the order of increasing the number of display pulses.
Order 3 Rudo is reduced a first sequence portion that is arranged
And a second arrangement portion in which at least two subfields are arranged, and between the two arrangement portions, the subfield having the largest number of display pulses is at least the first arrangement portion.
The part where the number of display pulses increases along with the part
And at the time of display operation, between adjacent fields, the gray scale is at least approximately 1/1 / the highest gray scale.
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 second gray level
The gray level is formed by the operation of one sub-field in which the number of display pulses assigned is larger than that of any of the sub-fields forming the first gray level. A display device wherein the activated sub-fields are arranged such that the arrangement order in the field is later than the one sub-field operated in the subsequent field of the second gradation. . 4. A first driving signal for forming a driving signal for driving an electrode of the matrix panel in a driving circuit of a display device for displaying a gradation image by causing a matrix panel to emit light by a subfield. , <br/> plurality of subfields within one field period, three or more sub in the order in which the number of display pulses allocated to each subfield is increased
3 or more fields in ascending order with the area where fields are arranged
Subfield and a portion which is arranged and the both portions
Subfield with the largest number of display pulses in the range of minutes
In the display operation, the gray level is changed from the first gray level of at least approximately 1/2 level or approximately 1/4 level of the highest gray level during the display operation. When changing to the second gradation one level higher than the one gradation,
The second gray level is formed by the operation of one sub-field in which the number of display pulses assigned is larger than any of the sub-fields forming the first gray level. Outputs a drive signal that is arranged such that the subfield operated last in the field is arranged after the one subfield operated in the subsequent field of the second gradation in the field. A driving circuit, comprising: a driving circuit. A plurality of sub-fields wherein one field period, parts and less becomes order three or more three or more sub-fields number in order of increases of display pulses allocated to each subfield is arranged Subfields are arranged in the subfield and the indication is within the two parts.
Are arranged so as to include the subfield in which the number of pulses for use is the largest , and at the time of display operation, between adjacent fields, the gray scale is at least approximately 1/2 level or approximately the highest gray scale. When the first gray level of the 階 調 level changes to the second gray level one level higher than the first gray level, the second gray level becomes the first gray level.
The sub-field which is formed by the operation of one sub-field in which the number of display pulses assigned is larger than any of the sub-fields forming the gray scale, and which operates last in the preceding field of the first gray scale, Forming a display section driving signal arranged such that the arrangement order in the field is later than the one subfield operated in the subsequent field of the second gradation; A brightness of a display unit is controlled by the number of display pulses of a display signal, and an image having a gray scale is displayed. 6. A display device for displaying an image having a gradation by a subfield, wherein a plurality of subfields within one field period are divided into three or more in the order of increasing the number of display pulses assigned to each subfield . The display pulse has a portion in which subfields are arranged and a portion in which three or more subfields are arranged in decreasing order, and the number of the display pulses within the range of both portions.
Are arranged so as to include the largest number of subfields , and at the time of display operation, the gradation between adjacent fields is
At least when the first gray level of approximately 1/2 level or approximately 1/4 level of the highest gray level changes to the second gray level which is higher by one level than the first gray level, the second gray level becomes the first gray level. The one subfield which is formed by the operation of one subfield in which the number of display pulses assigned is larger than any of the subfields forming the gray scale, and which is operated in a field subsequent to the second gray scale The display device is arranged so that a display period of a subfield that operates last in a preceding field of the first gradation is within a time range retroactive by one field from the start of the display period. 7. Displays images with gradation by subfield
In the display device shown, The number of display pulses assigned to the subfields
1, 2, 2 ^Two , 2 ^Three Multiple subfields of…
In the field, and the plurality of sub-fields
Three or more sub-fields in the order of increasing the number of display pulses
2 in ascending order with the first array portion where
A second array portion where at least one subfield is arrayed;
And the display pulse is arranged between the two arrangement portions.
Subfields with the largest number of
The part in the order in which the number of display pulses decreases along with the part
Are arranged to form
Between the fields, the gradation is at least about 1 of the highest gradation.
/ 2 level or approximately 1/4 level first gradation
When changing to the second gradation one level higher than the gradation,
Any of the subfields in which two gradations form the first gradation
The number of display pulses assigned to
The first field is formed by the operation of the
The last active subfield in the field is the second floor
The one subfield operating in a subsequent field of the key
So that the array order in the field is later than the
A display device characterized by being arranged in a matrix.