JPH08340221A - Variable current consumption amplifier and display device - Google Patents
Variable current consumption amplifier and display deviceInfo
- Publication number
- JPH08340221A JPH08340221A JP7147071A JP14707195A JPH08340221A JP H08340221 A JPH08340221 A JP H08340221A JP 7147071 A JP7147071 A JP 7147071A JP 14707195 A JP14707195 A JP 14707195A JP H08340221 A JPH08340221 A JP H08340221A
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- Japan
- Prior art keywords
- signal
- video
- display device
- transistor
- consumption
- Prior art date
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Abstract
(57)【要約】
マルチスキャンディスプレイ装置で、低解像度信号受信
時及び全白信号受信時にディスプレイ装置の消費電力低
減を図る。
【構成】消費電流可変機能を有する映像増幅回路２０１
と、同期信号２０７を入力して水平同期周波数に応じた
信号を出力する同期信号処理部２０２と、カソード電流
を検出して、カソード電流量に応じた信号を出力するカ
ソード電流検出部２０４と、同期信号処理部２０２及び
カソード電流検出部２０４からの信号に基づき、映像増
幅回路２０１の消費電流を制御する制御部２０３とから
なる。
【効果】マルチスキャンディスプレイ装置で、低解像度
信号受信時及び全白信号受信時にディスプレイ装置の消
費電力低減を図ることができる。
(57) [Summary] In a multi-scan display device, the power consumption of the display device is reduced when a low resolution signal is received and when an all white signal is received. [Structure] Video amplifier circuit 201 having a consumption current variable function
A sync signal processing unit 202 which inputs the sync signal 207 and outputs a signal corresponding to the horizontal sync frequency; a cathode current detection unit 204 which detects a cathode current and outputs a signal corresponding to the cathode current amount; The control unit 203 controls the current consumption of the video amplifier circuit 201 based on the signals from the synchronization signal processing unit 202 and the cathode current detection unit 204. [Effect] With a multi-scan display device, power consumption of the display device can be reduced when a low resolution signal is received and when an all white signal is received.
Description
【０００１】[0001]
【産業上の利用分野】本発明は消費電流可変増幅器およ
びディスプレイ装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable current consumption amplifier and a display device.
【０００２】[0002]
【従来の技術】ディスプレイ装置の多くはマルチスキャ
ン機能を備え、様々な解像度の映像信号に対応してい
る。そして、マルチスキャンディスプレイ装置のＣＲＴ
をドライブするための映像増幅回路は、対応する映像信
号の最も解像度の高い信号に合わせて周波数特性を決め
ている。従来は、映像増幅回路にはカスコード増幅回路
や固定バイアスの能動負荷回路（例えば、特開平５−２
９１８４０号公報）が使用されており、解像度の違う映
像信号を受信しても映像増幅回路は常に同じ電流を消費
している。又、映像増幅回路にカスコード増幅回路を使
用している場合、ディスプレイ装置全体の消費電力が最
大となる全白信号受信時に映像増幅回路の消費電力も最
大となってしまっている。2. Description of the Related Art Most display devices have a multi-scan function and are compatible with video signals of various resolutions. And the CRT of the multi-scan display device
The video amplification circuit for driving the video signal determines the frequency characteristic according to the highest resolution signal of the corresponding video signal. Conventionally, a cascode amplifier circuit or an active load circuit with a fixed bias is used as a video amplifier circuit (for example, Japanese Patent Laid-Open No. 5-2
No. 91840) is used, and the video amplifier circuit always consumes the same current even when receiving video signals having different resolutions. Further, when the cascode amplifier circuit is used as the video amplifier circuit, the power consumption of the video amplifier circuit is maximized at the time of receiving the all-white signal which maximizes the power consumption of the entire display device.
【０００３】[0003]
【発明が解決しようとする課題】従来のディスプレイ装
置の映像増幅回路は固定バイアス回路であるため、特
に、広範囲の水平同期周波数に対応するマルチスキャン
ディスプレイ装置の場合、解像度の低い映像信号を受信
している時、映像増幅回路は過剰な周波数特性となり、
無駄な電力を消費してしまうという問題があった。又、
映像増幅回路にカスコード増幅回路を使用している場
合、ディスプレイ装置全体の消費電力が最大となる全白
信号受信時に、映像増幅回路の消費電力も最大となり、
ディスプレイ装置全体の最大消費電力が増大するという
問題があった。Since the image amplifying circuit of the conventional display device is a fixed bias circuit, a multi-scan display device corresponding to a wide range of horizontal synchronizing frequencies can receive a low resolution image signal. The video amplifier circuit has excessive frequency characteristics,
There was a problem that it wasted power. or,
When the cascode amplifier circuit is used for the video amplifier circuit, the power consumption of the video amplifier circuit also becomes maximum when receiving the all-white signal that maximizes the power consumption of the entire display device.
There is a problem that the maximum power consumption of the entire display device increases.
【０００４】[0004]
【課題を解決するための手段】本発明の消費電流可変増
幅器は、ｎｐｎトランジスタと、ｐｎｐトランジスタ
と、５個の抵抗器と、コンデンサと、定電圧源と、可変
電圧源とから成り、前記ｎｐｎトランジスタのコレクタ
を前記ｐｎｐトランジスタのコレクタに接続し、前記ｎ
ｐｎトランジスタのベースを前記第一の抵抗器を介して
入力端子に接続し、前記ｎｐｎトランジスタのエミッタ
を前記第三の抵抗器を介して接地し、前記ｐｎｐトラン
ジスタのベースを可変電圧源に接続し、前記ｐｎｐトラ
ンジスタのエミッタを第五の抵抗器を介して定電圧源に
接続し、前記ｎｐｎトランジスタのコレクタと前記ｐｎ
ｐトランジスタのコレクタとの接続点を出力端子と、第
四の抵抗器を介してｎｐｎトランジスタのベースに接続
し、前記コンデンサをｎｐｎトランジスタのベースとｐ
ｎｐトランジスタのベースとに接続し、第二の抵抗器を
ｎｐｎトランジスタのベースと大地とに接続して構成し
たことを特徴とする。A consumption current variable amplifier of the present invention comprises an npn transistor, a pnp transistor, five resistors, a capacitor, a constant voltage source, and a variable voltage source. Connecting the collector of the transistor to the collector of the pnp transistor,
The base of the pn transistor is connected to the input terminal through the first resistor, the emitter of the npn transistor is grounded through the third resistor, and the base of the pnp transistor is connected to the variable voltage source. , The emitter of the pnp transistor is connected to a constant voltage source through a fifth resistor, and the collector of the npn transistor and the pn
The connection point between the collector of the p-transistor and the output terminal is connected to the base of the npn-transistor via the fourth resistor, and the capacitor is connected to the base of the npn-transistor and p-type.
The second resistor is connected to the base of the npn transistor and the second resistor is connected to the base of the npn transistor and the ground.
【０００５】本発明のディスプレイ装置は、映像信号を
増幅してＣＲＴへ送る消費電流可変機能を有する映像増
幅回路と、同期信号を検出する同期信号処理部と、同期
信号処理部からの信号を入力し、制御信号を生成して、
前記映像増幅回路を制御する制御部とから成り、水平同
期周波数に応じて映像増幅回路の消費電流を制御し、
又、カソード電流を検出するカソード電流検出部と、カ
ソード電流検出部からの信号を入力し、制御信号を生成
して、前記映像増幅回路を制御する制御部とから成り、
カソード電流量に応じて映像増幅回路の消費電流を制御
することを特徴とする。The display device of the present invention inputs a signal from the video amplifier circuit having the function of varying the consumption current for amplifying the video signal and sending it to the CRT, the sync signal processing section for detecting the sync signal, and the sync signal processing section. And generate a control signal,
And a control unit for controlling the video amplification circuit, controlling the current consumption of the video amplification circuit according to the horizontal synchronizing frequency,
Further, it comprises a cathode current detection unit for detecting a cathode current, and a control unit for inputting a signal from the cathode current detection unit to generate a control signal and controlling the video amplification circuit,
It is characterized in that the current consumption of the video amplifier circuit is controlled according to the cathode current amount.
【０００６】[0006]
【作用】本発明の消費電流可変増幅器では、能動負荷回
路を形成するｐｎｐトランジスタのベース電圧を制御す
ることにより、直流バイアス電流を可変して、増幅器の
消費電流を変えられるようにしている。In the variable current consumption amplifier of the present invention, the DC bias current is varied by controlling the base voltage of the pnp transistor forming the active load circuit, so that the current consumption of the amplifier can be changed.
【０００７】本発明のディスプレイ装置では、同期信号
処理部で水平同期信号の検出を行ない、制御部で水平同
期周波数の低い時、すなわち解像度の低い信号の時には
映像増幅回路の消費電流を下げるように制御している。
又、カソード電流検出部でカソード電流の検出を行な
い、制御部で全白信号受信時に映像増幅回路の消費電流
を下げるように制御している。In the display device of the present invention, the sync signal processing unit detects the horizontal sync signal, and the control unit reduces the current consumption of the video amplifier circuit when the horizontal sync frequency is low, that is, when the signal has a low resolution. Have control.
Further, the cathode current detector detects the cathode current, and the controller controls to reduce the current consumption of the video amplifier circuit when receiving the all-white signal.
【０００８】[0008]
【実施例】本発明について図面を参照しながら説明す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings.
【０００９】図１は本発明による消費電流可変増幅器の
一実施例を示す回路図である。図１で、１０１はｎｐｎ
トランジスタ、１０２はｐｎｐトランジスタ、１０３〜
１０７はそれぞれ五個の抵抗器、１０８はコンデンサ、
１０９は可変電圧源、１１０は定電圧源、１１１は制御
端子、１１２は入力端子、１１３は出力端子である。ｎ
ｐｎトランジスタ１０１のコレクタをｐｎｐトランジス
タ１０２のコレクタに接続し、ｎｐｎトランジスタ１０
１のベースを第一の抵抗器１０３を介して入力端子１１
２に接続し、ｎｐｎトランジスタ１０１のエミッタを第
三の抵抗器１０５を介して接地し、ｐｎｐトランジスタ
１０２のベースを可変電圧源１０９に接続し、ｐｎｐト
ランジスタ１０２のエミッタを第五の抵抗器１０７を介
して定電圧源１１０に接続し、ｎｐｎトランジスタ１０
１のコレクタとｐｎｐトランジスタ１０２のコレクタと
の接続点を出力端子１１３と、第四の抵抗器１０６を介
してｎｐｎトランジスタ１０１のベースに接続し、コン
デンサ１０８をｎｐｎトランジスタ１０１のベースとｐ
ｎｐトランジスタ１０２のベースとに接続し、第二の抵
抗器１０４をｎｐｎトランジスタ１０１のベースと大地
とに接続されている。FIG. 1 is a circuit diagram showing an embodiment of a variable current consumption amplifier according to the present invention. In FIG. 1, 101 is npn
Transistor 102 is a pnp transistor 103-
107 are five resistors each, 108 is a capacitor,
109 is a variable voltage source, 110 is a constant voltage source, 111 is a control terminal, 112 is an input terminal, and 113 is an output terminal. n
The collector of the pn transistor 101 is connected to the collector of the pnp transistor 102, and the npn transistor 10
1 through the first resistor 103 to the input terminal 11
2, the emitter of the npn transistor 101 is grounded through the third resistor 105, the base of the pnp transistor 102 is connected to the variable voltage source 109, and the emitter of the pnp transistor 102 is connected to the fifth resistor 107. Connected to the constant voltage source 110 via the npn transistor 10
The connection point between the collector of 1 and the collector of the pnp transistor 102 is connected to the output terminal 113 and the base of the npn transistor 101 via the fourth resistor 106, and the capacitor 108 is connected to the base of the npn transistor 101 and p.
The second resistor 104 is connected to the base of the np transistor 102, and the second resistor 104 is connected to the base of the npn transistor 101 and the ground.
【００１０】以下、図１に示す消費電流可変増幅器の動
作について説明する。The operation of the variable current consumption amplifier shown in FIG. 1 will be described below.
【００１１】能動負荷回路を形成するｐｎｐトランジス
タ１０２のベース電圧を可変電圧源１０９により上げる
と、ｐｎｐトランジスタ１０２のエミッタ電圧が上が
り、第五の抵抗器１０７の両端電圧が下がるため、能動
負荷回路に流れる電流は下がる。同様にｐｎｐトランジ
スタ１０２のベース電圧を下げるとｐｎｐトランジスタ
１０２のエミッタ電圧が下がり、第五の抵抗器１０７の
両端電圧が上がるため、能動負荷回路に流れる電流は上
がる。この様にして増幅器の消費電流を変えられる。When the base voltage of the pnp transistor 102 forming the active load circuit is increased by the variable voltage source 109, the emitter voltage of the pnp transistor 102 increases and the voltage across the fifth resistor 107 decreases, so that the active load circuit is changed. The flowing current drops. Similarly, when the base voltage of the pnp transistor 102 is lowered, the emitter voltage of the pnp transistor 102 is lowered and the voltage across the fifth resistor 107 is raised, so that the current flowing through the active load circuit is raised. In this way, the current consumption of the amplifier can be changed.
【００１２】図２は本発明のディスプレイ装置の一実施
例を示すブロック図である。FIG. 2 is a block diagram showing an embodiment of the display device of the present invention.
【００１３】映像増幅回路２０１は映像信号２０６を入
力してＣＲＴ２０５をドライブする消費電流可変機能を
有する増幅器である。同期信号処理部２０２は同期信号
２０７を入力して水平同期周波数に応じた信号を制御部
２０３に送る。IK（カソード電流）検出部２０４ではＣ
ＲＴ２０５のカソード電流を検出して、カソード電流量
に応じた信号を制御部２０３に送る。制御部２０３では
同期信号処理部２０２及びIK検出部２０４からの信号に
基づき、映像増幅回路２０１の消費電流を制御する。The video amplifier circuit 201 is an amplifier having a function of varying the consumed current for inputting the video signal 206 and driving the CRT 205. The sync signal processing unit 202 inputs the sync signal 207 and sends a signal according to the horizontal sync frequency to the control unit 203. C in the IK (cathode current) detector 204
The cathode current of the RT 205 is detected and a signal corresponding to the cathode current amount is sent to the control unit 203. The control unit 203 controls the current consumption of the video amplification circuit 201 based on the signals from the synchronization signal processing unit 202 and the IK detection unit 204.
【００１４】以下、図２に示すディスプレイ装置の動作
について説明する。The operation of the display device shown in FIG. 2 will be described below.
【００１５】同期信号処理部２０２及び制御部２０３で
は水平同期周波数の低い時、すなわち解像度の低い信号
の時には、映像増幅回路の消費電流を下げるように制御
する。同様に、水平同期周波数の高い時、すなわち解像
度の高い信号の時には、映像増幅回路の消費電流を上げ
るように制御する。又、ＩK検出部２０４及び制御部２
０３では、全白信号受信時に、ＣＲＴ２０５の最大輝度
は一定のままで映像増幅回路２０１の消費電流を下げる
ように制御する。The sync signal processing unit 202 and the control unit 203 control so that the current consumption of the video amplifier circuit is lowered when the horizontal sync frequency is low, that is, when the signal has a low resolution. Similarly, when the horizontal synchronizing frequency is high, that is, when the signal has a high resolution, the current consumption of the video amplifier circuit is controlled to be increased. Also, the IK detector 204 and the controller 2
In 03, when the all-white signal is received, control is performed so that the maximum luminance of the CRT 205 remains constant and the current consumption of the video amplifier circuit 201 is reduced.
【００１６】[0016]
【発明の効果】本発明の消費電流可変増幅器によれば、
能動負荷回路の電流を可変して増幅器のバイアス電流を
制御できるようにしたので、この消費電流可変増幅器を
マルチスキャンディスプレイ装置内の映像増幅回路に使
用することにより解像度の低い信号を受信している時や
全白信号受信時に、ディスプレイ装置の消費電力を低減
することができる。According to the variable consumption current amplifier of the present invention,
Since the bias current of the amplifier can be controlled by varying the current of the active load circuit, the variable current consumption amplifier is used for the image amplifying circuit in the multi-scan display device to receive a low resolution signal. It is possible to reduce the power consumption of the display device at the time of receiving an all-white signal.
【００１７】本発明のディスプレイ装置によれば、消費
電流可変機能を有する映像増幅回路と、同期信号を入力
して水平同期周波数に応じた信号を出力する同期信号処
理部と、カソード電流を検出して、カソード電流量に応
じた信号を出力するＩK検出部と、同期信号処理部及び
ＩK検出部からの信号に基づき、映像増幅回路の消費電
流を制御する制御部とを備えるようにしたので、解像度
の低い信号を受信している時や全白信号受信時にディス
プレイ装置の消費電力を低減することができる。According to the display device of the present invention, a video amplifier circuit having a variable current consumption function, a sync signal processing section for receiving a sync signal and outputting a signal corresponding to a horizontal sync frequency, and detecting a cathode current. Thus, the IK detection unit that outputs a signal according to the cathode current amount and the control unit that controls the current consumption of the video amplifier circuit based on the signals from the synchronization signal processing unit and the IK detection unit are provided. It is possible to reduce the power consumption of the display device when receiving a low-resolution signal or when receiving an all-white signal.
【図１】本発明の消費電流可変増幅器の回路図。FIG. 1 is a circuit diagram of a variable current consumption amplifier according to the present invention.
【図２】本発明のディスプレイ装置の一実施例を示すブ
ロック図。FIG. 2 is a block diagram showing an embodiment of a display device of the present invention.
２０１…映像増幅回路、２０２…同期信号処理部、２０
３…制御部、２０４…カソード電流検出部、２０５…Ｃ
ＲＴ。201 ... Video amplifier circuit, 202 ... Sync signal processing unit, 20
3 ... Control unit, 204 ... Cathode current detection unit, 205 ... C
RT.
Claims (3)
タと、五個の抵抗器と、コンデンサと、定電圧源と、可
変電圧源とを含み、前記ｎｐｎトランジスタのコレクタ
を前記ｐｎｐトランジスタのコレクタに接続し、前記ｎ
ｐｎトランジスタのベースを前記第一の抵抗器を介して
入力端子に接続し、前記ｎｐｎトランジスタのエミッタ
を前記第三の抵抗器を介して接地し、前記ｐｎｐトラン
ジスタのベースを可変電圧源に接続し、前記ｐｎｐトラ
ンジスタのエミッタを第五の抵抗器を介して定電圧源に
接続し、前記ｎｐｎトランジスタのコレクタと前記ｐｎ
ｐトランジスタのコレクタとの接続点を出力端子と、前
記第四の抵抗器を介してｎｐｎトランジスタのベースに
接続し、前記コンデンサを前記ｎｐｎトランジスタのベ
ースと前記ｐｎｐトランジスタのベースとに接続し、前
記第二の抵抗器を前記ｎｐｎトランジスタのベースと大
地とに接続して構成したことを特徴とする消費電流可変
増幅器。1. An npn transistor, a pnp transistor, five resistors, a capacitor, a constant voltage source, and a variable voltage source, the collector of the npn transistor is connected to the collector of the pnp transistor, N
The base of the pn transistor is connected to the input terminal through the first resistor, the emitter of the npn transistor is grounded through the third resistor, and the base of the pnp transistor is connected to the variable voltage source. , The emitter of the pnp transistor is connected to a constant voltage source through a fifth resistor, and the collector of the npn transistor and the pn
A connection point between the collector of the p-transistor and an output terminal is connected to the base of the npn transistor through the fourth resistor, the capacitor is connected to the base of the npn transistor and the base of the pnp transistor, and A consumption current variable amplifier characterized in that a second resistor is connected to the base of the npn transistor and the ground.
映像信号を増幅してＣＲＴへ送る請求項１の前記消費電
流可変機能を有する映像増幅回路と、同期信号を検出す
る同期信号処理部と、前記同期信号処理部からの信号を
入力し、制御信号を生成して、映像増幅回路を制御する
制御部とから成り、水平同期周波数に応じて前記映像増
幅回路の消費電流を制御するディスプレイ装置。2. In a video circuit of a display device,
A video amplifier circuit having the consumption current variable function according to claim 1, which amplifies a video signal and sends it to a CRT, a sync signal processing unit for detecting a sync signal, and a signal from the sync signal processing unit, and a control signal And a control unit for controlling the video amplifier circuit for controlling the current consumption of the video amplifier circuit according to the horizontal synchronizing frequency.
映像信号を増幅してＣＲＴへ送る請求項１の前記消費電
流可変機能を有する映像増幅回路と、カソード電流を検
出するカソード電流検出部と、前記カソード電流検出部
からの信号を入力し、制御信号を生成して、前記映像増
幅回路を制御する制御部とから成り、カソード電流量に
応じて前記映像増幅回路の消費電流を制御するディスプ
レイ装置。3. In a video circuit of a display device,
A video amplification circuit having the consumption current variable function according to claim 1, which amplifies a video signal and sends it to a CRT, a cathode current detection unit for detecting a cathode current, and a signal from the cathode current detection unit, and a control signal. And a control unit for controlling the video amplification circuit, and controlling the current consumption of the video amplification circuit according to the cathode current amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7147071A JPH08340221A (en) | 1995-06-14 | 1995-06-14 | Variable current consumption amplifier and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7147071A JPH08340221A (en) | 1995-06-14 | 1995-06-14 | Variable current consumption amplifier and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08340221A true JPH08340221A (en) | 1996-12-24 |
Family
ID=15421821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7147071A Pending JPH08340221A (en) | 1995-06-14 | 1995-06-14 | Variable current consumption amplifier and display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08340221A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003019934A1 (en) * | 2001-08-23 | 2003-03-06 | Thomson Licensing S.A. | Adaptive bandwidth control in a kinescope amplifier |
-
1995
- 1995-06-14 JP JP7147071A patent/JPH08340221A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003019934A1 (en) * | 2001-08-23 | 2003-03-06 | Thomson Licensing S.A. | Adaptive bandwidth control in a kinescope amplifier |
| CN1317883C (en) * | 2001-08-23 | 2007-05-23 | 汤姆森特许公司 | Adaptive Bandwidth Control in CRT Amplifiers |
| US7277136B2 (en) | 2001-08-23 | 2007-10-02 | Thomson Licensing | Adaptive bandwidth control in a kinescope amplifier |
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