Projection-type image display device
AssigneeHitachi Maxell, Ltd.
InventorsEriko Nagata, Shinji Onodera, Satomi Morishita, Naoya Oka, Masaaki Iwanaga
Life of this patent
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Abstract
This projection-type image display device is provided with: a lamp drive unit that drives a lamp; a lamp voltage detection unit that detects a lamp interelectrode voltage (hereinafter referred to as a lamp voltage); an image correction unit that corrects image qualities of image signals to be supplied to an image display element; and a control unit that controls a correction quantity of the image correction unit on the basis of the lamp voltage detected by means of the lamp voltage detection unit. Consequently, deterioration of visibility of a projection image can be suitably suppressed.
Claims10
A projection-type image display device including a discharge lamp as a light source, comprising:
- a lamp driving unit configured to drive the discharge lamp;
- a lamp voltage detection unit configured to detect a voltage between electrodes (hereinafter, a lamp voltage) of the discharge lamp;
- an image correction processing unit configured to perform an image quality correction of an image signal supplied to an image display element;
- a control unit configured to control an amount of correction for the image correction processing unit based on the lamp voltage detected by the lamp voltage detection unit, and
- a menu screen creating unit,
- wherein, via a menu screen created by the menu screen creating unit, both a first setting item regarding an image quality adjustment and a second setting item regarding an image quality adjustment are settable,
- the first setting item is configured to control the amount of correction for the image correction processing unit based on the lamp voltage detected by the lamp voltage detection unit, and
- the second setting item is configured to allow a user to select a parameter regarding the amount of correction not based on the lamp voltage detected by the lamp voltage detection unit.
A projection-type image display device including a discharge lamp as a light source, comprising:
- a lamp driving unit configured to drive the discharge lamp;
- a lamp voltage detection unit configured to detect a voltage between electrodes (hereinafter, a lamp voltage) of the discharge lamp;
- an image correction processing unit configured to perform an image quality correction of an image signal supplied to an image display element;
- a control unit configured to control an amount of correction for the image correction processing unit based on the lamp voltage detected by the lamp voltage detection unit;
- and
- a lighting period managing unit configured to manage an accumulated lighting period (hereinafter, a lamp usage period) of the discharge lamp,
- wherein the control unit is configured to control the amount of correction for the image correction processing unit based on the lamp voltage detected by the lamp voltage detection unit and the lamp usage period obtained from the lighting period managing unit,
- the discharge lamp is housed in a lamp block, the lamp block including a microcomputer, the microcomputer storing deterioration characteristic data unique to the discharge lamp, the microcomputer being configured to be communicable with the control unit, and
- the control unit is configured to calculate a rate of decrease in illuminance of the discharge lamp from the lamp voltage and the lamp usage period using deterioration characteristic data unique to the discharge lamp obtained from the microcomputer through the communication, the control unit being configured to control the amount of correction for the image correction processing unit according to the rate of decrease in illuminance.
Dependencies are inferred from the claim text.