EP0590837A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
CRT display unit and power supply control method therefor
Assignee: Nanao Corp
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Filing: 1993-09-20
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Granted: —
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Expires: 2013-09-20
Abstract
Abstract After a screen saver has displayed a homogeneous black picture for a limited period of time (e.g. 3 minutes) a main power supply (3) of the CRT display unit is switched off. After an other preset period of time (5 to 60 minutes), the heater (14) power supply is in turn switched off. The operation of the screen saver may be carried on by an extension graphic board (51) installed in a computer of an open architecture type. When no manipulation of the key board (57) and of the mouse (58) is detected (68) before a preset period of time, a blank signal is supplied to the CRT display unit.
Inventors
- 👤 Katsuhisa c/o Nanao Corporation Takase
- 👤 Yuichi c/o Nanao Corporation Komatsu
- 👤 Hajime c/o Nanao Corporation Torii
- 👤 Toshihisa c/o Nanao Corporation Tanabe
- 👤 Kazuhiro c/o Nanao Corporation Konishi
- 👤 Hideo c/o Nanao Corporation Katada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 14:35
CPC Classifications
G; G06; G06F; G06F1/00; G06F1/26; G06F1/32; G06F1/3203; G06F1/3206; G06F1/3215; G06F1/3218; G06F1/3234; G06F1/325; G06F1/3265; G09; G09G; G09G1/00; G09G1/005; H; H04; H04N; H04N5/00; H04N5/63; G09G2330/00; G09G2330/02; G09G2330/021; G09G2330/022; H04N5/66; H04N5/68; Y; Y02; Y02D; Y02D10/00
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
297 words
A CRT display unit being connected to a central unit generating a synchronizing signal and a video signal for displaying an image of said video signal, said CRT display unit comprising: a power supply circuit (3) including a main power supply (4) and an auxiliary power supply (5); a power circuit (9), being driven by said main power supply (4), including a high voltage circuit (6), a deflection circuit (7) and a video circuit (8); a synchronous processing circuit (16) for processing said synchronizing signal from said central unit and supplying processed said synchronizing signal to said high voltage circuit (6) and said deflection circuit (7); a video input processing circuit (17), including video signal detection means (20) for detecting presence/absence of said video signal from said central unit, for processing said video signal and supplying processed said video signal to said video circuit (8); a CRT (10) comprising an anode (11) being supplied with a high dc voltage from said high voltage circuit (6), a deflection yoke (12) being supplied with a deflecting current from said deflection circuit (7), a cathode (13) being supplied with a cathode drive signal from said video circuit (8), and a heater (14) being supplied with a current from said auxiliary power supply (5); main power supply control means (15) for controlling said main power supply (4) to turn on/off said power circuit (9) upon detection of presence/absence of said video signal by said video signal detection means (20); first timer means for clocking at least a turnoff period of time of said power circuit (9); and auxiliary power supply means (45) for controlling said auxiliary power supply (5) to turn off said heater (14) after a lapse of a period of time being previously set in said first timer means.
Claim 2
Dependent Claim
59 words
A CRT display unit in accordance with claim 1, wherein said main power supply control means (15) comprises second timer means for clocking a state with absence of said video signal, and power circuit turnoff means for turning off said power circuit (9) after a lapse of a period of time being previously set in said second timer means.
Claim 3
Dependent Claim
24 words
A CRT display unit in accordance with claim 1, wherein said period of time being previously set in said first timer means is variable.
Claim 4
Dependent Claim
52 words
A CRT display unit in accordance with claim 1, wherein said main power supply control means (15) comprises blanking signal generation means for supplying a picture blanking signal to said video circuit (8) for a prescribed period of time when said video signal detection means (20) detects presence of said video signal.
Claim 5
Dependent Claim
51 words
A CRT display unit in accordance with claim 1, further comprising means for controlling said power supply circuit (3) to turn off said power circuit (9) and said heater (14) after a lapse of a prescribed period of time upon detection of absence of said synchronizing signal from said central unit.
Claim 6
Dependent Claim
38 words
A CRT display unit in accordance with claim 1, wherein said video signal includes video signals of respective colors of red, green and blue, said video signal detection means detecting presence/absence of said red or blue color signal.
Claim 7
Dependent Claim
169 words
An extension graphics board (51), to be inserted in an option slot being provided in a computer (56) of an open architecture type, comprising a circuit for supplying a video signal to a CRT display unit (60) in accordance with claim 1 for displaying an image based on an input signal from external input means (57, 58), said extension graphics board (51) comprising: an input detection part (68) for monitoring presence/absence of an interruption request being generated upon receiving of said input signal and detecting presence/absence of said input signal from said external input means (57, 58); timer means (69) starting a clocking operation upon detection of presence of said input signal by said input detection part (68); and means (61, 63, 64) for supplying a blank signal to said CRT display unit (60) as said video signal upon no re-detection of presence of said input signal by said input detection part (68) before a lapse of a period of time being previously set in said timer means (69).
Claim 8
Dependent Claim
45 words
An extension graphics board in accordance with claim 7, wherein said input means includes a keyboard (57), said input detection part (68) including means (78) for detecting an address signal being supplied to an address bus (66) in response to manipulation of said keyboard (57).
Claim 9
Dependent Claim
44 words
An extension graphics board in accordance with claim 7, wherein said external input means includes a mouse (58), said input detection part (68) including means (77) for detecting an interruption signal being supplied as an output in response to manipulation of said mouse (58).
Claim 10
Dependent Claim
51 words
An extension graphics board in accordance with claim 7, wherein a plurality of said external input means (57, 58) are provided, said timer means (69) starting a clocking operation when said input detection part (68) detects presence of an input signal from any one of said external input means (57, 58).
Claim 11
Dependent Claim
35 words
An extension graphics board in accordance with claim 10, wherein said input detection part (68) comprises means (79) for selecting said external input means (57, 58) generating a signal whose presence is to be detected.
Claim 12
Dependent Claim
281 words
A CRT display unit being connected to a central unit generating a synchronizing signal and a video signal for displaying an image of said video signal, said CRT display unit comprising: a power supply circuit (3) including a main power supply (4) and an auxiliary power supply (5); a power circuit (9), being driven by said main power supply (4), including a high voltage circuit (6), a deflection circuit (7) and a video circuit (8); a synchronous processing circuit (16) for processing said synchronizing signal from said central unit and supplying processed said synchronizing signal to said high voltage circuit (6) and said deflection circuit (7); a video input processing circuit (17), including video signal detection means (20) for detecting presence/absence of said video signal from said central unit, for processing said video signal and supplying processed said video signal to said video circuit (8); a CRT (10) comprising an anode (11) being supplied with a high dc voltage from said high voltage circuit (6), a deflection yoke (12) being supplied with a deflecting current from said deflection circuit (7), a cathode (13) being supplied with a cathode drive signal from said video circuit (8), and a heater (14) being supplied with a current from said auxiliary power supply (5); timer means (15) starting clocking upon detection of absence of said video signal by said video signal detection means (20) for clocking a state with absence of said video signal; and power supply circuit control means (15) for controlling said power supply circuit (3) to turn off said power circuit (9) and said heater (14) after a lapse of a period of time being previously set in said timer means (15).
Claim 13
Dependent Claim
51 words
A CRT display unit in accordance with claim 12, further comprising means for controlling said power supply circuit (3) to turn off said power circuit (9) and said heater (14) after a lapse of a prescribed period of time upon detection of absence of said synchronizing signal from said central unit.
Claim 14
Dependent Claim
38 words
A CRT display unit in accordance with claim 12, wherein said video signal includes video signals of respective colors of red, green and blue, said video signal detection means detecting presence/absence of said red or blue color signal.
Claim 15
Dependent Claim
169 words
An extension graphics board (51), to be inserted in an option slot being provided in a computer (56) of an open architecture type, comprising a circuit for supplying a video signal to a CRT display unit (60) in accordance with claim 12 for displaying an image based on an input signal from external input means (57, 58), said extension graphics board (51) comprising: an input detection part (68) for monitoring presence/absence of an interruption request being generated upon receiving of said input signal and detecting presence/absence of said input signal from said external input means (57, 58); timer means (69) starting a clocking operation upon detection of presence of said input signal by said input detection part (68); and means (61, 63, 64) for supplying a blank signal to said CRT display unit (60) as said video signal upon no re-detection of presence of said input signal by said input detection part (68) before a lapse of a period of time being previously set in said timer means (69).
Claim 16
Dependent Claim
45 words
An extension graphics board in accordance with claim 15, wherein said input means includes a keyboard (57), said input detection part (68) including means (78) for detecting an address signal being supplied to an address bus (66) in response to manipulation of said keyboard (57).
Claim 17
Dependent Claim
44 words
An extension graphics board in accordance with claim 15, wherein said external input means includes a mouse (58), said input detection part (68) including means (77) for detecting an interruption signal being supplied as an output in response to manipulation of said mouse (58).
Claim 18
Dependent Claim
51 words
An extension graphics board in accordance with claim 15, wherein a plurality of said external input means (57, 58) are provided, said timer means (69) starting a clocking operation when said input detection part (68) detects presence of an input signal from any one of said external input means (57, 58).
Claim 19
Dependent Claim
35 words
An extension graphics board in accordance with claim 18, wherein said input detection part (68) comprises means (79) for selecting said external input means (57, 58) generating a signal whose presence is to be detected.
Claim 20
Dependent Claim
197 words
A power supply control method for a CRT display unit being connected to a central unit generating a video signal for displaying an image of said video signal, said CRT display unit comprising a CRT (10) including an anode (11), a deflection yoke (12), a cathode (13) and a heater (14), a power circuit (9) including a high voltage circuit (6) for applying a high dc voltage to said anode (11), a deflection circuit (7) for supplying a deflecting current to said deflection yoke (12) and a video circuit (8) for supplying a cathode drive signal to said cathode (13), and a power supply circuit (3) including a main power supply (4) providing a power supply for driving said power circuit (9) and an auxiliary power supply (5) for supplying a current to said heater (14), said power supply control method comprising the steps of: controlling said main power supply (4) to turn off said power circuit (9) in response to absence of said video signal; and controlling said auxiliary power supply (15) to turn off said heater (14) after a lapse of a prescribed period of time in an OFF state of said power circuit (9).
Claim 21
Dependent Claim
75 words
A power supply control method in accordance with claim 20, wherein said step of controlling said main power supply (4) to turn off said power circuit (9) comprises a step of maintaining said power circuit (9) in an ON state until a prescribed period of time elapses in a state with absence of said video signal, and a step of turning off said power circuit (9) after a lapse of said prescribed period of time.
Claim 22
Dependent Claim
31 words
A power supply control method in accordance with claim 20, wherein a period of time from turnoff of said power circuit (9) to turnoff of said heater (14) is rendered variable.
Claim 23
Dependent Claim
189 words
A power supply control method for a CRT display unit being connected to a central unit generating a video signal for displaying an image of said video signal, said CRT display unit comprising a CRT (10) including an anode (11), a deflection yoke (12), a cathode (13) and a heater (14), a power circuit (9) including a high voltage circuit (6) for applying a high dc voltage to said anode (11), a deflection circuit (7) for supplying a deflecting current to said deflection yoke (12) and a video circuit (8) for supplying a cathode drive signal to said cathode (13), and a power supply circuit (3) including a main power supply (4) providing a power supply for driving said power circuit (9) and an auxiliary power supply (5) for supplying a current to said heater (14), said power supply control method comprising the step of: controlling said main power supply (4) and said auxiliary power supply (15) to turn off said power circuit (9) and said heater (14) respectively after a lapse of a prescribed period of time from starting of a state with absence of said video signal.
Claim 24
Dependent Claim
164 words
An extension graphics board (51), to be inserted in an option slot being provided in a computer (56) of an open architecture type, comprising a circuit for supplying a video signal to a CRT display unit (60) for displaying an image based on an input signal from external input means (57, 58), said extension graphics board (51) comprising: an input detection part (68) for monitoring presence/absence of an interruption request being generated upon receiving of said input signal and detecting presence/absence of said input signal from said external input means (57, 58); timer means (69) starting a clocking operation upon detection of presence of said input signal by said input detection part (68); and means (61, 63, 64) for supplying a blank signal to said CRT display unit (60) as said video signal upon no re-detection of presence of said input signal by said input detection part (68) before a lapse of a period of time being previously set in said timer means (69).
Claim 25
Dependent Claim
45 words
An extension graphics board in accordance with claim 24, wherein said input means includes a keyboard (57), said input detection part (68) including means (78) for detecting an address signal being supplied to an address bus (66) in response to manipulation of said keyboard (57).
Claim 26
Dependent Claim
44 words
An extension graphics board in accordance with claim 24, wherein said external input means includes a mouse (58), said input detection part (68) including means (77) for detecting an interruption signal being supplied as an output in response to manipulation of said mouse (58).
Claim 27
Dependent Claim
51 words
An extension graphics board in accordance with claim 24, wherein a plurality of said external input means (57, 58) are provided, said timer means (69) starting a clocking operation when said input detection part (68) detects presence of an input signal from any one of said external input means (57, 58).
Claim 28
Dependent Claim
35 words
An extension graphics board in accordance with claim 27, wherein said input detection part (68) comprises means (79) for selecting said external input means (57, 58) generating a signal whose presence is to be detected.
Claim 29
Dependent Claim
57 words
A control circuit for controlling the power supply of a CRT monitor coupled to a computer, the control circuit including means for monitoring the video signals supplied to the computer to determine the existence of a blank display, and means operable to switch off the heater of the CRT at a predetermined delay time following said determination.
Claim 30
Dependent Claim
63 words
A control circuit as claimed in claim 29, wherein the power supply includes a first supply circuit for supplying power to the heater, and a second supply circuit for supplying power to at least some other parts of the CRT monitor, the control circuit being operable to disable the second power circuit at a predetermined period prior to disabling the first power circuit.
Claim 31
Dependent Claim
46 words
A monitoring circuit for monitoring the video signal supplied by a computer to a CRT monitor, the monitoring circuit being operable to detect the absence of a video signal in response to the red and/or blue components, but not the green component, of the video signal.
References Cited (Backward Citations)
No citation records indexed.
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