JPH07261700A - Method of driving image display discharge tube - Google Patents

Method of driving image display discharge tube

Info

Publication number
JPH07261700A
JPH07261700A JP6054242A JP5424294A JPH07261700A JP H07261700 A JPH07261700 A JP H07261700A JP 6054242 A JP6054242 A JP 6054242A JP 5424294 A JP5424294 A JP 5424294A JP H07261700 A JPH07261700 A JP H07261700A
Authority
JP
Japan
Prior art keywords
luminance
scanning line
sub
displayed
subfields
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6054242A
Other languages
Japanese (ja)
Inventor
Taichi Shino
太一 志野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electronics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electronics Corp filed Critical Matsushita Electronics Corp
Priority to JP6054242A priority Critical patent/JPH07261700A/en
Publication of JPH07261700A publication Critical patent/JPH07261700A/en
Pending legal-status Critical Current

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  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)

Abstract

PURPOSE:To miniaturize and lighten a power source and to reduce the cost by replacing permutation of plural sub-fields at every scanning line when a multi-level image is obtained by successively displaying plural sub-fields weighted with luminance in one field period. CONSTITUTION:The luminance Bj of the picture of the sub-field SF (J) becomes Bj=2<(j-1)>XB<o> (J=1-8), and the luminance B on a display screen in one field period becomes B=SIGMA(AJX2<(>J<-1)>)XBo (AJ=0 or 1, J=1-8) by successively displaying the images of eight sub-fields in one field period, and an image display with 256 gradations is attained. Then, in a first row scanning line, the sub-field SF (8) is the first on the list, and SF (7), SF (6) follow, and in a second row scanning line, the sub-field SF (7) is the first on the list, and SF (6), SF (5) follow. That is, the subfields weighted with eight kinds of luminance are mixed and displayed by the shift of a writing period at every scanning line, and the luminance is averaged.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、画像表示放電管を用い
てTVや広告等の画像を多階調で表示する画像表示放電
管駆動方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of driving an image display discharge tube for displaying an image of a TV, an advertisement or the like in multiple gradations by using the image display discharge tube.

【0002】[0002]

【従来の技術】2階調での画像表示しかできない画像表
示放電管を用いて中間調を含む多階調での画像表示効果
を得るために、それぞれに輝度の重み付けがなされた複
数のサブフィールドの画像信号を1フィールド期間に順
次に表示させる方法が知られている。この場合、それぞ
れに2(J-1)(ただしJ=1,2,…n)の輝度の重み
付けがなされたn個のサブフィールドの画像信号が1フ
ィールド期間に順次に表示されるので、1フィールド期
間における表示画面上の輝度Bは、最小表示輝度をB0
とするとき、B=Σ(AJ×2(J-1))×B0(ただしAJ
=0または1,J=1〜n)となり、n個のサブフィー
ルドの組合せによって2n階調での画像表示が可能とな
る。
2. Description of the Related Art In order to obtain an image display effect in multiple gradations including halftones by using an image display discharge tube capable of displaying an image in only two gradations, a plurality of subfields each having a brightness weighted. There is known a method of sequentially displaying the image signals of (1) during one field period. In this case, the image signals of n subfields, each of which is weighted with a luminance of 2 (J-1) (where J = 1, 2, ... N), are sequentially displayed in one field period. The brightness B on the display screen in the field period is the minimum display brightness B 0.
Then, B = Σ (A J × 2 (J-1) ) × B 0 (where A J
= 0 or 1, J = 1 to n), and it is possible to display an image in 2 n gradations by combining n subfields.

【0003】1例として、フィールド周期1/60秒に
256階調のTV画像を表示する場合のサブフィールド
の配列順序を図4に示す。この場合、各サブフィールド
には輝度に関して2(J-1)(ただしJ=1〜8)の重み
付けがなされており、サブフィールドSF(J)の表示
画面上における輝度BJはBJ=2(J-1)×B0(ただしJ
=1〜8)となる。この8サブフィールドの画像信号を
1フィールド期間に順次に表示させるので、1フィール
ド期間における表示画面上での輝度Bは、B=Σ(AJ
×2(J-1)×B0(ただしAJ=0または1,J=1〜
8)となり、256階調での画像表示が可能となる。
As an example, FIG. 4 shows an arrangement sequence of subfields when a TV image of 256 gradations is displayed in a field cycle of 1/60 seconds. In this case, each subfield is weighted with 2 (J-1) (where J = 1 to 8) with respect to the luminance, and the luminance B J on the display screen of the subfield SF (J) is B J = 2. (J-1) × B 0 (J
= 1 to 8). Since the image signals of the eight subfields are sequentially displayed in the one field period, the brightness B on the display screen in the one field period is B = Σ (A J
× 2 (J-1) × B 0 (where A J = 0 or 1, J = 1 to
8), and image display with 256 gradations is possible.

【0004】この場合、図4に示すように走査線ごとに
8サブフィールドが常に同一の順序で配列される。つま
り、1行目の走査線上ではサブフィールドSF(8)を
筆頭にしてSF(7),SF(6)…の順で表示され、
2行目の走査線上でもサブフィールドSF(8)を筆頭
にしてSF(7),SF(6)…の順で表示される。さ
らに続く走査線上でもサブフィールドSF(8)を筆頭
にしてSF(7),SF(6)…の順で表示される。
In this case, as shown in FIG. 4, eight subfields are always arranged in the same order for each scanning line. That is, on the scanning line in the first row, the sub-field SF (8) is displayed first, and then SF (7), SF (6), ...
Also on the scanning line of the second row, the subfield SF (8) is displayed first and SF (7), SF (6), ... Are displayed in this order. Also on the subsequent scanning line, the subfield SF (8) is displayed in the order of SF (7), SF (6), ....

【0005】この場合の画像表示の駆動タイミングは図
5に示すように、まず、1行目の走査がSF(8),S
F(7),SF(6)…の順でなされる。2行目の走査
は1行目のSF(8)の書き込み期間終了後に開始され
て、SF(8),SF(7),SF(6)…の順で表示
される。3行目の走査は2行目のSF(8)の書き込み
期間終了後に開始されて、SF(8),SF(7),S
F(6)…の順で表示されるという具合に以後も順次に
続く。そして、最終行のSF(8),SF(7)…SF
(1)の表示が終了することによって1画面分の画像表
示が完了するのであって、このような動作の繰り返しに
よってTV等の動画が多階調で表示される。
The drive timing of image display in this case is, as shown in FIG. 5, that the scanning of the first row is SF (8), S.
F (7), SF (6) ... Are made in this order. The scanning of the second row is started after the writing period of SF (8) of the first row and is displayed in the order of SF (8), SF (7), SF (6) .... The scanning of the third row is started after the end of the writing period of SF (8) of the second row, and SF (8), SF (7), S
F (6) ... are displayed in this order, and so on. Then, SF (8), SF (7) ... SF in the last row
The image display for one screen is completed by the end of the display of (1), and the moving image of the TV or the like is displayed in multiple gradations by repeating such an operation.

【0006】[0006]

【発明が解決しようとする課題】しかし、上述したよう
なサブフィールド配列であると、図5に示すように輝度
に関して同一の重み付けをされたサブフィールドが、書
き込み期間相当分のずれこそあれ、ほぼ同時に画像表示
されるので、時刻τ1に画像表示される走査線数と、時
刻τ2に画像表示される走査線数との間に大差が生じ
る。つまり、サブフィールドの期間によって表示容量が
大きく変化し、表示放電管の駆動電流が大幅に変化す
る。駆動電流の最大値は図6に示すように、平均駆動電
流の約4倍にも達するので、駆動電流供給電源の電力容
量は平均的必要量の約4倍となる。このため、電源の体
積・重量およびコストがともにかさむという課題があっ
た。
However, in the subfield arrangement as described above, the subfields having the same weighting with respect to the luminance as shown in FIG. Since images are displayed at the same time, a large difference occurs between the number of scanning lines image-displayed at time τ 1 and the number of scanning lines image-displayed at time τ 2 . That is, the display capacity changes greatly depending on the period of the subfield, and the drive current of the display discharge tube changes significantly. Since the maximum value of the drive current reaches about 4 times the average drive current as shown in FIG. 6, the power capacity of the drive current supply power source is about 4 times the average required amount. Therefore, there is a problem that the volume, weight, and cost of the power source are large.

【0007】[0007]

【課題を解決するための手段】本発明によると、それぞ
れに輝度の重み付けがなされた複数のサブフィールドの
画像信号を1フィールド期間に順次に表示させるに当た
り、複数のサブフィールドの配列順序を走査線ごとに入
れ換える。
According to the present invention, when the image signals of a plurality of subfields, each of which is weighted in luminance, are sequentially displayed in one field period, the arrangement order of the plurality of subfields is set to the scanning line. Replace each time.

【0008】[0008]

【作用】このように構成したことによって、輝度に関し
て種々の重みをもつサブフィールドが混成して画像表示
されることになり、1フィールド周期内における表示容
量が平準化される。このため、表示放電のための駆動電
流の変動が抑制されて、駆動電流供給電源の電力容量は
平均的駆動電流を賄い得る程度のもので足りるようにな
り、電源の小型化・軽量化およびコストの低減を図るこ
とが可能となる。
With this structure, subfields having various weights with respect to luminance are mixed and displayed as an image, and the display capacity in one field period is leveled. Therefore, the fluctuation of the drive current due to the display discharge is suppressed, and the power capacity of the drive current supply power supply is sufficient to cover the average drive current, thus reducing the size and weight of the power supply and reducing the cost. Can be reduced.

【0009】[0009]

【実施例】つぎに、本発明の実施例を図1、図2および
図3を参照しながら説明する。
Embodiments of the present invention will now be described with reference to FIGS. 1, 2 and 3.

【0010】図1に示す実施例は、フィールド周期1/
60秒で256階調のTV画像を表示する事例で、各サ
ブフィールドには輝度に関して2(J-1)(ただしJ=1
〜8)の重み付けがなされている。サブフィールドSF
(J)の表示画面上での輝度BJはBJ=2(J-1)×B
0(ただしJ=1〜8)となり、この8サブフィールド
の画像を1フィールド期間に順次に表示することによっ
て、1フィールド期間の表示画面上での輝度Bは、B=
Σ(AJ×2(J-1))×B0(ただしAJ=0または1,J
=1〜8)となり、256階調での画像表示が可能とな
る。
In the embodiment shown in FIG. 1, the field period 1 /
In the case of displaying a TV image with 256 gradations in 60 seconds, each subfield has a luminance of 2 (J-1) (where J = 1.
~ 8) are weighted. Subfield SF
The brightness B J on the display screen of (J) is B J = 2 (J-1) × B
0 (where J = 1 to 8), and the luminance B on the display screen during the 1 field period is B =
Σ (A J × 2 (J-1) ) × B 0 (where A J = 0 or 1, J
= 1 to 8), and image display with 256 gradations is possible.

【0011】この場合、図1に示すように走査線ごとの
サブフィールドの組合せの順序が、走査線ごとに入れ換
えられた配列となっている。すなわち、1行目の走査線
上ではサブフィールドSF(8)を筆頭にしてSF
(7),SF(6)…の順に表示される配列であるのに
対し、2行目の走査線上ではサブフィールドSF(7)
を筆頭にしてSF(6),SF(5)…の順に表示され
る配列になっている。さらに続く走査線上でも、サブフ
ィールドが一つずつずれた順序で表示される配列になっ
ている。
In this case, as shown in FIG. 1, the order of the combination of subfields for each scanning line is switched for each scanning line. That is, on the scanning line of the first row, the subfield SF (8) is the first and SF
(7), SF (6) ... are displayed in this order, whereas subfield SF (7) is displayed on the scanning line in the second row.
Is the first one, and SF (6), SF (5) ... Are displayed in this order. Also on the subsequent scanning lines, the subfields are displayed in the order of being shifted one by one.

【0012】かかるサブフィールド配列での駆動タイミ
ングを図2に示す。画像表示の仕方は、まず、1行目の
表示がSF(8),SF(7),SF(6)…の順序で
行われ、2行目は1行目のSF(8)の書き込み期間終
了直後に開始されて、SF(7),SF(6),SF
(5)…の順に表示される。3行目は2行目のSF
(7)の書き込み期間終了直後に開始されて、SF
(6),SF(5),SF(4)…の順に表示される。
続く行の表示も前行のサブフィールドの書き込み期間終
了直後に開始されて、上述と同様に前行に対し一つずつ
ずれ込む。このようにして最終行の8サブフィールドの
表示が終了した時点で1画面分の画像表示が完了するの
であり、このような動作の繰り返しによって動画が多階
調に表示される。
FIG. 2 shows the drive timing in such a subfield array. Regarding the image display, first, the first line is displayed in the order of SF (8), SF (7), SF (6), and the second line is the writing period of SF (8) of the first line. Started immediately after the end, SF (7), SF (6), SF
(5) ... are displayed in this order. 3rd line is the 2nd line SF
SF is started immediately after the end of the writing period of (7).
(6), SF (5), SF (4) ... Are displayed in this order.
The display of the following row is also started immediately after the end of the writing period of the subfield of the preceding row, and is shifted one by one with respect to the preceding row as described above. In this way, the image display for one screen is completed when the display of the eight subfields in the final row is completed, and the moving image is displayed in multiple gradations by repeating such an operation.

【0013】かかるサブフィールドの配列では、図2に
示すように時刻τ1において同時に表示される走査線数
と、時刻τ2において同時に表示される走査線数とが近
似したものとなる。すなわち、8種の輝度重みをもつサ
ブフィールドが、走査線ごとに書き込み期間のずれでも
って混成して表示されるので、平準化が得られ、サブフ
ィールドごとに表示容量が大きく変化することがなくな
る。このように、フィールド周期内での表示容量がほぼ
一定に抑えられるので、表示放電のための駆動電流の変
化量を軽減させることができる。
In such an arrangement of subfields, as shown in FIG. 2, the number of scanning lines simultaneously displayed at time τ 1 and the number of scanning lines simultaneously displayed at time τ 2 are close to each other. That is, since the subfields having eight kinds of luminance weights are mixed and displayed with the writing period shifted for each scanning line, leveling is obtained and the display capacity does not change greatly for each subfield. . In this way, since the display capacity within the field period can be suppressed to a substantially constant value, the amount of change in the drive current for display discharge can be reduced.

【0014】駆動電流の最大値は図3に示すように、平
均駆動電流よりもほんのわずか上回る程度(約+5%)
のものとなるので、駆動電流を供給する電源の電力容量
は平均的必要容量を賄える程度の比較的小さいもので足
りるようになる。
The maximum value of the driving current is, as shown in FIG. 3, slightly higher than the average driving current (about + 5%).
Therefore, the power capacity of the power supply for supplying the drive current is relatively small enough to cover the average required capacity.

【0015】上述した実施例では、サブフィールドの配
列に関して、1行目の走査線上でSF(8),SF
(7),SF(6)…の順とし、2行目の走査線上で
は、SF(7),SF(6),SF(5)…の順とした
が、1行目の走査線上でSF(8),SF(7),SF
(6)の順とし、2行目の走査線上でSはF(1),S
F(8),SF(7)…の順とし、3行目の走査線上で
はSF(2)から始まる順にという具合に配列すること
も可能である。さらに、2行目の走査線上のサブフィー
ルドをSF(7)やSF(1)から始めないで、それ以
外のサブフィールドから始めてもよく、種々の組合せか
ら選択することができる。
In the above-described embodiment, regarding the arrangement of subfields, SF (8), SF (8), SF
(7), SF (6), ... In the order of SF (7), SF (6), SF (5) ,. (8), SF (7), SF
In the order of (6), S is F (1), S on the second scanning line.
It is also possible to arrange them in the order of F (8), SF (7), ... In the order starting from SF (2) on the scanning line of the third row. Furthermore, the subfields on the scanning line in the second row may not start from SF (7) or SF (1) but may start from other subfields, and various combinations can be selected.

【0016】[0016]

【発明の効果】以上のように本発明によると、それぞれ
に輝度の重み付けがなさた複数のサブフィールドを、1
フィールド期間に順次に表示して多階調画像を得るに当
たり、複数のサブフィールドの順列を走査線ごとに入れ
換えるのであって、最大駆動電流値の平準化によって駆
動電流供給電源の電力容量を抑え得ることから、電源の
小型軽量化およびコストの低減が可能となる。
As described above, according to the present invention, a plurality of sub-fields, each of which is weighted with brightness, are set to one.
When sequentially displaying in the field period to obtain a multi-gradation image, the permutation of a plurality of subfields is switched for each scanning line, and the power capacity of the drive current supply power supply can be suppressed by leveling the maximum drive current value. Therefore, it is possible to reduce the size and weight of the power supply and reduce the cost.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例における複数のサブフィール
ドの配列図
FIG. 1 is an array diagram of a plurality of subfields according to an embodiment of the present invention.

【図2】本発明の一実施例における複数のサブフィール
ドの駆動タイミング図
FIG. 2 is a drive timing chart of a plurality of subfields according to an embodiment of the present invention.

【図3】本発明の一実施例における複数のサブフィール
ドの駆動電流の波形図
FIG. 3 is a waveform diagram of drive currents of a plurality of subfields according to an embodiment of the present invention.

【図4】従来例における複数のサブフィールドの配列図FIG. 4 is an array diagram of a plurality of subfields in a conventional example.

【図5】従来例における複数のサブフィールドの駆動タ
イミング図
FIG. 5 is a drive timing diagram of a plurality of subfields in a conventional example.

【図6】従来例における複数のサブフィールドの駆動電
流の波形図
FIG. 6 is a waveform diagram of drive currents of a plurality of subfields in a conventional example.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 1フィールドの画像表示を多階調で行う
ために、それぞれに輝度の重み付けがなされた複数のサ
ブフィールドの画像信号を1フィールド期間に順次に表
示させるに当たり、複数のサブフィールドの配列順序を
走査線ごとに入れ換えることを特徴とする画像表示放電
管駆動方法。
1. To display image signals of a plurality of sub-fields, each of which is weighted in luminance, in order to display an image of one field in multiple gradations, in order to sequentially display the image signals of the plurality of sub-fields, An image display discharge tube driving method characterized in that the arrangement order is changed for each scanning line.
JP6054242A 1994-03-25 1994-03-25 Method of driving image display discharge tube Pending JPH07261700A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6054242A JPH07261700A (en) 1994-03-25 1994-03-25 Method of driving image display discharge tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6054242A JPH07261700A (en) 1994-03-25 1994-03-25 Method of driving image display discharge tube

Publications (1)

Publication Number Publication Date
JPH07261700A true JPH07261700A (en) 1995-10-13

Family

ID=12965083

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6054242A Pending JPH07261700A (en) 1994-03-25 1994-03-25 Method of driving image display discharge tube

Country Status (1)

Country Link
JP (1) JPH07261700A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6340960B1 (en) 1998-02-24 2002-01-22 Lg Electronics Inc. Circuit and method for driving plasma display panel
KR100517862B1 (en) * 1998-11-30 2005-11-25 오리온전기 주식회사 Driving Method of Plasma Display Panel
KR100596238B1 (en) * 1999-05-21 2006-07-05 엘지전자 주식회사 Driving Method of Plasma Display Panel and Driving Apparatus Thereof
CN100365679C (en) * 2005-04-11 2008-01-30 东南大学 Driving method for field emission displays
US8373625B2 (en) 2001-08-03 2013-02-12 Semiconductor Energy Laboratory Co., Ltd. Display device and method of driving thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6340960B1 (en) 1998-02-24 2002-01-22 Lg Electronics Inc. Circuit and method for driving plasma display panel
KR100517862B1 (en) * 1998-11-30 2005-11-25 오리온전기 주식회사 Driving Method of Plasma Display Panel
KR100596238B1 (en) * 1999-05-21 2006-07-05 엘지전자 주식회사 Driving Method of Plasma Display Panel and Driving Apparatus Thereof
US8373625B2 (en) 2001-08-03 2013-02-12 Semiconductor Energy Laboratory Co., Ltd. Display device and method of driving thereof
CN100365679C (en) * 2005-04-11 2008-01-30 东南大学 Driving method for field emission displays

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