JP2006308632A5

JP2006308632A5 -

Info

Publication number: JP2006308632A5
Application number: JP2005127494A
Authority: JP
Filing date: 2005-04-26
Publication date: 2008-05-29
Anticipated expiration: 2025-04-26

Claims

An image display device including a spatial light modulator that corrects image data representing an image with a gradation value for each pixel and modulates light emitted from a light source based on the corrected image data,
A setting selection unit for selecting a setting from a plurality of settings including at least the first setting and the second setting;
In response to the selected setting, a dimming rate setting unit for setting a first dimming rate for controlling the amount of light emitted by the light source;
An image data acquisition unit for acquiring the image data;
A brightness correction unit that controls a gradation value of the image data so as to reduce a change in brightness generated in the light modulated by the spatial light modulator by controlling the amount of light according to the first dimming rate;
An image display device comprising: a light amount control unit that controls a light amount emitted from the light source based on the first dimming rate.

The image display device according to claim 1,
When the first setting is selected from the plurality of settings, the dimming rate setting unit sets a first dimming rate for performing control to reduce the amount of light emitted from the light source from a predetermined amount of light. An image display device.

The image display device according to claim 1 or 2,
When the second setting is selected from the plurality of settings, the dimming rate setting unit changes the value of the first dimming rate in accordance with the tone value of the image data. An image display device characterized by that.

In the image display device according to any one of claims 1 to 3,
The image data further includes a gradation conversion unit that converts gradation values so as to expand a range in which the gradation values of pixels are distributed,
The brightness correction unit converts the converted image data so as to reduce a change in brightness generated in light modulated by the spatial light modulator by controlling the amount of light according to the conversion and the first dimming rate. An image display device that controls the gradation value of the image.

The image display device according to claim 4,
The brightness correction unit
The converted image so that the product of the average value of the gradation values of the corrected image data and the first light control rate approaches the average value of the gradation values of the image data before conversion. An image display device which corrects a gradation value of data.

An image display device according to any one of claims 1 to 5,
The brightness correction unit is a brightness generated in the light modulated by the spatial light modulator when the gradation value of the image data before correction is corrected to be close to a predetermined reference gradation value. An image display device that corrects a gradation value of image data before correction so as to reduce a change.

The image display device according to claim 6,
The brightness correction unit calculates a gradation value of the image data before correction by a product of an average value of gradation values of the corrected image data and the first dimming rate, and calculates a predetermined reference gradation An image display device, wherein the gradation value of the image data before correction is corrected so as to approach an average value of gradation values when the correction is performed so as to approach the value.

In the image display device according to any one of claims 1 to 7,
The brightness correction unit maintains the same gradation value for the upper limit value and the lower limit value of the gradation value in the range of gradation values before correction, and the gradation between the upper limit value and the lower limit value. An image display device characterized by changing a value.

The image display device according to any one of claims 1 to 8,
The brightness correction unit
In the range where the gradation value is larger than the average value of the gradation values of the image data before correction when the light control rate for performing the control to reduce the light amount emitted from the light source from the predetermined light amount is set. When the ratio of the brightness of the light modulated based on the corrected image data to the brightness of the light modulated based on the image data before correction is smaller than a predetermined ratio, the ratio of the brightness is set to the predetermined brightness Set a second dimming rate that can be
The light quantity control unit controls the light quantity emitted from the light source based on the second dimming rate.

The image display device according to any one of claims 1 to 9,
The brightness correction unit
In the range where the gradation value is smaller than the average value of the gradation values of the image data before correction when the dimming rate is set for performing control to increase the light amount emitted from the light source from a predetermined light amount, When the ratio of the light brightness modulated based on the corrected image data to the light brightness modulated based on the image data before correction is smaller than a predetermined ratio, the brightness ratio is set to a predetermined ratio. Set a second dimming rate that can be
The light quantity control unit controls the light quantity emitted from the light source based on the second dimming rate.

In the image display device according to any one of claims 2 to 10,
The setting selection unit selects the first setting when the image display device is operating with power stored in a battery and receives power from the outside of the image display device. An image display device that selects the second setting.

The image display device according to any one of claims 2 to 11,
The setting selection unit
The first setting is selected when the image data is data representing text, and the second setting is selected when the image data is data representing a natural image. Display device.

The image display device according to any one of claims 1 to 12,
The first dimming rate and the second dimming rate represent a visual ratio according to a human visual sensitivity characteristic to light;
The light amount control unit calculates a third dimming rate indicating a ratio of the light amount actually emitted from the light source based on the visual sensitivity characteristic from the dimming rate or the limit dimming rate, and An image display device that controls a light source according to a third dimming rate.

An image display method comprising a spatial light modulator that corrects image data representing an image with a gradation value for each pixel and modulates light emitted from a light source based on the corrected image data,
A setting selection step of selecting a setting from a plurality of settings including at least the first setting and the second setting;
A dimming rate setting step for setting a first dimming rate for controlling the amount of light emitted by the light source, corresponding to the selected setting;
An image data acquisition step of acquiring the image data;
A brightness correction step for controlling a gradation value of the image data so as to reduce a change in brightness generated in the light modulated by the spatial light modulator by controlling the amount of light according to the first dimming rate;
A light amount control step of controlling a light amount emitted from the light source based on the first dimming rate.

Image data representing an image is corrected by a gradation value for each pixel, and an image is displayed on an image display device including a spatial light modulator that modulates light emitted from a light source based on the corrected image data. An image display program for
A computer of the image display device;
A setting selection unit for selecting a setting from a plurality of settings including at least the first setting and the second setting;
In response to the selected setting, a dimming rate setting unit that sets a first dimming rate for controlling the amount of light emitted by the light source,
An image data acquisition unit for acquiring the image data;
A brightness correction unit for controlling a gradation value of the image data so as to reduce a change in brightness generated in the light modulated by the spatial light modulator by controlling the amount of light according to the first dimming rate; and ,
An image processing program that functions as a light amount control unit that controls a light amount emitted from the light source based on the first dimming rate.