CN1885934A - Projection type video display apparatus - Google Patents
Projection type video display apparatus Download PDFInfo
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- CN1885934A CN1885934A CN 200610095933 CN200610095933A CN1885934A CN 1885934 A CN1885934 A CN 1885934A CN 200610095933 CN200610095933 CN 200610095933 CN 200610095933 A CN200610095933 A CN 200610095933A CN 1885934 A CN1885934 A CN 1885934A
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- lamp
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- display apparatus
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Abstract
A projection type video display apparatus includes a projection lamp and a video signal processing circuit which performs video processing to an input video signal. The projection type video display apparatus includes means for performing an initializing process of the video signal processing circuit in a period until brightness of the projection lamp reaches brightness enough to project video since the projection lamp is lit and in a period except for a period during which lamp lighting noise is generated immediately after the projection lamp is lit.
Description
Technical field
The present invention relates to projection type video display apparatus such as liquid crystal projector, DLP projector.
Background technology
As liquid crystal projector etc., in the projection type video display apparatus that lamp is used as light source, have from lamp and light, to the brightness of lamp reach projection video the shortcoming grown of the time till the enough brightness.And, the noise effect that when lamp is lighted, takes place, generally adjust circuit or panel for video and light lamp after adjusting the initial setting of circuit being through with, its from power turn-on the brightness to lamp reach projection video need the longer time till the enough brightness.
All the time, try every possible means not allow the user the brightness from the power turn-on to the lamp reach projection video till the enough brightness during feel bored or shade video, or show that starting LOGO replaces video-projection, or projection is reciprocal shows etc.But, in this way can't shorten the time till from the power turn-on to the video, being shown.
Patent document 1: Japanese kokai publication sho 63-212991 communique
Summary of the invention
The projection type video display apparatus that the purpose of this invention is to provide the time shorteningization till the brightness that the brightness from the power turn-on to the lamp can be reached enough.
First aspect present invention is a kind of projection type video display apparatus, it has possessed the video processing circuit that carries out Video processing for projection with lamp and incoming video signal, be provided with in the described projection type video display apparatus: light with lamp from projection the back up to projection reach with the brightness of lamp projection video till the enough brightness during, in during the lamp after lamp has just been lighted is lighted between emergence period of noise, carry out the parts that the initial setting of video processing circuit is handled.
According to a first aspect of the invention, second aspect present invention is characterised in that: be provided with from projection and light the back with lamp till the initial setting processing of video processing circuit finishes, projection blackout parts frequently.
According to of the present invention first or second aspect, third aspect present invention is characterised in that: video processing circuit comprises that the vision signal that incoming video signal is adjusted into best video adjusts circuit and will adjust the panel that vision signal that circuit obtains is adjusted into the video that is fit to display floater by vision signal and adjust circuit.
According to first, second or the third aspect of the present invention, fourth aspect present invention is characterised in that: detect the situation that projection has been lighted with lamp based on projection with the inter-electrode voltage of lamp.
According to first, second, third, fourth aspect of the present invention, the brightness from the power turn-on to the lamp can be reached the time shorteningization till the enough brightness.
According to second aspect present invention, since from projection with lamp light the back till the initial setting processing of video processing circuit finishes during, projection with the brightness of lamp do not reach projection video enough brightness, therefore can prevent to show in the meantime the video that does not see Chu.
According to a third aspect of the present invention, need be in order to not detect the transducer that lamp has been lighted.
Description of drawings
Fig. 1 is the block diagram of the structure of expression liquid crystal projector.
Fig. 2 is the block diagram of the structure of indication lamp ballasting circuit 4.
Fig. 3 is the timing diagram that lamp starting process and lamp brightness change in the expression present embodiment.
Fig. 4 is the timing diagram that lamp starting process and lamp brightness change in the expression conventional case.
(symbol description)
1 liquid crystal projector, 2 key input detecting circuits, 3 power circuits, 5 lamps, 4 lamp ballasting circuits, 6 vision signals are adjusted circuit, and 7 panels are adjusted circuit, 8 panel drive circuits, 9 display device panels, 20 control microcomputers.
Embodiment
Embodiment when with reference to the accompanying drawings, just the present invention being applicable to liquid crystal projector describes.
Embodiment 1
[1] explanation of relevant liquid crystal projector structure
Fig. 1 represents the structure of liquid crystal projector.
Liquid crystal projector 1 possesses: the key input detecting circuit 2 that detects the key input, power circuit 3 to each circuit supply power, become the lamp (projection lamp) 5 of light source, the lamp ballasting circuit 4 that control lamp 5 drives, display device panel 9, the vision signal that incoming video signal is adjusted into best video is adjusted circuit 6, to adjust the panel that vision signal that circuit 6 obtained is adjusted into the video that is fit to display device panel 9 by vision signal and adjust circuit 7, to adjust the panel drive circuit 8 that vision signal that circuit 7 obtained writes display device panel 9 by panel, optical lens 10 and control the control microcomputer 20 of each circuit.The light of lamp 5 is by display device panel 9 and optical lens 10, thereby the video-projection that writes display device panel 9 is to projection screen 11.
Vision signal is adjusted circuit 6 and is comprised A/D change-over circuit, video demodulator circuit, image quality adjustment circuit etc.Panel is adjusted circuit 7 and is comprised gamma adjustment circuit, look irregular adjustment circuit, image quality adjustment circuit etc.Adjust circuit 7 by vision signal adjustment circuit 6 and panel and constitute video processing circuit.
Control is during microcomputer 20 and control the starting of power circuit 3, the time and control lighting/extinguishing of lamp 5, the time and control of video signal adjustment circuit 6, panel are adjusted the setting of circuit 7 and panel drive circuit 8.
The structure of Fig. 2 indication lamp ballasting circuit 4.
As everyone knows, lamp ballasting circuit 4 possesses: be used to control modulating voltage modulating voltage control circuit 41, light firing circuit (lighting circuit) 42 and control microcomputer 43 that lamp uses.
Control microcomputer 43 is connected with control microcomputer 20, communicates by UART communication between two microcomputers 43,20.Control microcomputer 43 carries out lighting, extinguish and brightness adjustment control of lamp for modulating voltage control circuit 41.The interelectrode voltage of lamp (discharge voltage) is sent to control microcomputer 43 by firing circuit (lighting circuit) 42 and modulating voltage control circuit 41.
[2] explanation of lamp starting process
Fig. 3 represents the lamp starting process of present embodiment and the variation of lamp brightness.Transverse axis express time among Fig. 3, the brightness of longitudinal axis indication lamp.
The user pushes the power turn-on button, if this measure is detected by key input detecting circuit 2, then controls the starting control of microcomputer 20 beginning liquid crystal projectors.That is, at first, control microcomputer 20 startup power supply circuit 3 for to each circuit supply power.
Secondly, light the minimal setting that lamp is used.Specifically, when carrying out the setting of lamp initial voltage, carry out panel driving for panel drive circuit 8 and set for lamp ballast 4.Then, carry out in order to lighting the control of lamp, thereby lamp is lighted.
If detect lamp and lighted, then for avoid lighting noise during, through behind the certain hour, carry out the initial setting that vision signal is adjusted circuit 6.Specifically carry out vision signal and adjust the initial setting that circuit 6 interior A/D change-over circuit, video demodulator circuit, image quality are adjusted circuit.Also have, the situation that lamp has been lighted, whether the lamp inter-electrode voltage that is sent to control microcomputer 20 according to the control microcomputer 43 in lamp ballasting circuit 4 is that predetermined value detects.After this, carry out the initial setting that panel is adjusted circuit 7.Specifically carry out panel and adjust the initial setting that circuit 7 interior gammas are adjusted circuit, look irregular adjustment circuit, image quality adjustment circuit.Then, when the brightness of lamp reach projection video during enough brightness, the projection of beginning video.
In addition, when drive circuit 8 carries out the panel driving setting over there, carry out projection blackout black display setting frequently.Then, adjust initial setting process last of circuit 7 at panel, remove black display setting.As a result, light the back till the initial setting of panel adjustment circuit 7 finishes from lamp, video when panel is adjusted the initial setting end of circuit 7, is begun common video-projection by shade.
Owing to when drive circuit 8 carries out the panel driving setting over there, carry out projection blackout black display setting frequently, can not be subjected to the influence of its front stage circuits (vision signal adjusts circuit 6 and panel is adjusted circuit 7), projection blackout reliably is frequently.
Fig. 4 represents the lamp starting process of conventional case and the variation of lamp brightness.
All the time, when pushing the power turn-on button by the user, power circuit 3 is just started.And, light noise in order to avoid lamp, before lighting lamp, carry out vision signal and adjust in the initial setting of circuit 6, carry out the initial setting that panel is adjusted circuit 7.
After this, when carrying out the setting of lamp initial voltage, carry out the panel driving of counter plate drive circuit 8 and set.Then, light the control of lamp.Thereby lamp is lighted.The brightness that lamp is lighted back light reach projection video during enough brightness, the projection of beginning video.In addition, from lamp light the back up to the brightness of lamp reach projection video till the enough brightness, video is by shade.
When present embodiment and conventional case were compared, in the present embodiment, the time of being started till lighting to lamp from power circuit was shortened.This is because adjust circuit 6 and panel and adjust the initial setting of circuit 7 and compare with carrying out vision signal before lamp is lighted in conventional case, in the present embodiment, does not carry out vision signal and adjust the initial setting that circuit 6 and panel are adjusted circuit 7 before lamp is lighted.
In the present embodiment, vision signal is adjusted the initial setting of circuit 6 and panel adjustment circuit 7, be lamp by light the back up to the brightness of lamp reach projection video till the enough brightness during, carry out during the modulation noise after lamp has just been lighted is between the emergence period.Promptly, in the present embodiment, by effectively utilize lamp light the back up to the brightness of lamp reach projection video enough brightness during, shortened from power circuit and started the time of back till lamp is lighted, in other words, shortened from the power turn-on button be pressed the back up to lamp by the time till lighting.Thus, the power turn-on button is pressed after (from power turn-on), and the time (time till video is projected) till the brightness of lamp reaches enough brightness is shortened.
Claims (4)
1. projection type video display apparatus, it has possessed for projection carries out the video processing circuit of Video processing with lamp and incoming video signal, is provided with in the described projection type video display apparatus:
Light with lamp from projection the back up to projection reach with the brightness of lamp projection video till the enough brightness during, in during the lamp after lamp has just been lighted is lighted between emergence period of noise, carry out the parts that the initial setting of video processing circuit is handled.
2. projection type video display apparatus as claimed in claim 1 is characterized in that: be provided with from projection and light the back with lamp till the initial setting processing of video processing circuit finishes, projection blackout parts frequently.
3. projection type video display apparatus as claimed in claim 1 or 2 is characterized in that: video processing circuit comprises that the vision signal that incoming video signal is adjusted into best video adjusts circuit and will adjust the panel that vision signal that circuit obtains is adjusted into the video that is fit to display floater by vision signal and adjust circuit.
4. as each described projection type video display apparatus in the claim 1,2 or 3, it is characterized in that: detect the situation that projection has been lighted with lamp with the inter-electrode voltage of lamp based on projection.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005182791 | 2005-06-23 | ||
| JP2005182791 | 2005-06-23 | ||
| JP2006069046 | 2006-03-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1885934A true CN1885934A (en) | 2006-12-27 |
Family
ID=37583880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610095933 Pending CN1885934A (en) | 2005-06-23 | 2006-06-23 | Projection type video display apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1885934A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101682713B (en) * | 2007-05-31 | 2011-08-17 | Nec显示器解决方案株式会社 | Apparatus for displaying an image and method for controlling power supply |
| CN105093788A (en) * | 2014-05-13 | 2015-11-25 | 株式会社理光 | Image projector and image projector control method |
-
2006
- 2006-06-23 CN CN 200610095933 patent/CN1885934A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101682713B (en) * | 2007-05-31 | 2011-08-17 | Nec显示器解决方案株式会社 | Apparatus for displaying an image and method for controlling power supply |
| CN105093788A (en) * | 2014-05-13 | 2015-11-25 | 株式会社理光 | Image projector and image projector control method |
| US9733559B2 (en) | 2014-05-13 | 2017-08-15 | Ricoh Company, Ltd. | Dual controller image projector |
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Application publication date: 20061227 |