JP2007171744A - Image display system, image display method, information processing device, liquid crystal device, control program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display system capable of simplifying the configuration of a liquid crystal display device and reducing the manufacturing cost thereof. <P>SOLUTION: The image display system PC2 comprises: a changeless area determination part 2354 which makes a comparison between the information of the respective hues contained in the previous image information corresponding to an optical image displayed by liquid crystal elements and the following image information one behind the previous information at two or more predetermined positions, to determine an area formed at a position where the change in each hue information has a predetermined relation as the changeless area; an image persistence area determination part 2355 which determines an area in which the duration of the changeless area is a predetermined allowable period or longer as an image persistence area of the liquid crystal elements; and an image persistence compensation processing part 2356 which performs image persistence compensation processing to the image persistence area for the newest image information and outputs the processed image information. A projector of the image display system acquires the processed image information and displays an optical image on the basis of the processed image information by applying a predetermined voltage to the liquid crystal elements based on the processed image information. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image display system, an image display method, an information processing device, a liquid crystal display device, a control program, and a recording medium.

2. Description of the Related Art Conventionally, there has been known a liquid crystal display device using a liquid crystal element that changes an alignment state of liquid crystal by applying a voltage and modulates an incident light beam for each pixel according to the alignment state of the liquid crystal to display an optical image. Yes.
In such a liquid crystal display device, when a substantially constant direct current (DC) voltage is applied to the liquid crystal element for a long time, an internal electric field may be generated and fixed in the liquid crystal. That is, even when the applied voltage is changed, the information displayed before is displayed by the internal electric field generated in the liquid crystal, and the display mark of the image remains like an afterimage. A problem, so-called burning, occurs.
Thus, a technique for suppressing screen burn-in in a liquid crystal element has been proposed (see, for example, Patent Document 1).
In the technique described in Patent Document 1, a burn-in suppression circuit is newly provided in the hardware configuration of the liquid crystal display device. This burn-in suppression circuit reverses the polarity of the pixel electrode voltage applied to the pixel electrode constituting the liquid crystal element at a predetermined cycle with respect to the counter electrode voltage applied to the counter electrode constituting the liquid crystal element, and faces the pixel electrode. The average voltage applied between the electrodes is set to 0 V, and driving is performed so that a DC voltage is not applied to the liquid crystal.

JP 2004-133177 A

However, in the technique described in Patent Document 1, since the burn-in suppression circuit is provided in the hardware configuration of the liquid crystal display device to suppress screen burn-in in the liquid crystal element, the configuration of the liquid crystal display device is simplified, and This hinders the reduction of manufacturing costs.
For this reason, there is a demand for a technique that can correct the burn-in of the screen in the liquid crystal element by software control such as performing image processing on the image information, and can simplify the configuration of the liquid crystal display device and reduce the manufacturing cost. .

  An object of the present invention is to provide an image display system, an image display method, an information processing device, a liquid crystal display device, a control program, and a recording medium that can simplify the configuration of the liquid crystal display device and reduce the manufacturing cost.

  An image display system according to the present invention includes an information processing device that processes image information, and an optical device that changes an alignment state of liquid crystals by applying a voltage and modulates an incident light beam for each pixel according to the alignment state of the liquid crystals. A liquid crystal element that displays an image, and a drive control unit that applies to the liquid crystal element a voltage based on color tone information for each pixel representing a color tone included in the image information based on the image information processed by the information processing device And an information transmission means for connecting the information processing device and the image display device so that information can be transmitted and received, wherein the information processing device is a liquid crystal element. The previous image information and the subsequent image corresponding to the previous image information corresponding to the displayed optical image and the respective color tone information included in the subsequent image information immediately after the previous image information. A non-change region determination unit that determines, as a non-change region, a region constituted by a position where a change in each color tone information has a predetermined relationship by comparing at a plurality of predetermined positions in each image corresponding to information; By comparing the continuous period determined to be a non-change area by the change area determination unit and a predetermined allowable period, an area where the continuous period is equal to or greater than the allowable period is defined as a screen burning area in the liquid crystal element. A burn-in area determination unit that determines as a burn-in correction process unit that performs burn-in correction processing on the burn-in area determined by the burn-in area determination unit with respect to the latest latest image information and outputs processed image information; The drive control unit of the liquid crystal display device obtains the processed image information and applies a predetermined voltage to the liquid crystal element based on the processed image information. Wherein the displaying an optical image based on the serial processed image information.

Here, in the determination of the non-change region in the non-change region determination unit, the tone information included in the previous image information and the subsequent image information may be compared at a plurality of positions in each image, and the comparison is made for every pixel position. A configuration may be used, or a configuration may be used in which comparison is made only at a plurality of predetermined pixel positions instead of all pixel positions.
The information transmission means is not limited to a standard for transmitting information by wire such as a USB (Universal Serial Bus) cable or a LAN (Local Area Network) cable, but via a wireless medium (radio wave, sound, infrared, etc.). It also includes standards for transmitting information.

According to the present invention, in the image display system, the information processing apparatus includes the non-change area determination unit, the burn-in area determination unit, and the burn-in correction processing unit, and the liquid crystal display device includes the liquid crystal element and the drive control unit. As shown below, an image can be displayed on the liquid crystal display device.
First, on the information processing apparatus side, image information is processed and transmitted as shown below.
That is, the non-change area determination unit compares each color tone information included in each of the previous image information and the subsequent image information at a predetermined plurality of positions in each image corresponding to the previous image information and the subsequent image information. An area composed of positions where changes have a predetermined relationship is determined as a non-change area.
Next, the burn-in area determination unit continuously continues the non-change area determined by the non-change area determination unit (for example, the number of frames) and a predetermined allowable period (for example, the number of frames). Are compared with each other, and a region where the duration is equal to or longer than the permissible period is determined as a burn-in region where burn-in has occurred on the screen of the liquid crystal element or burn-in can occur.
The burn-in correction processing unit performs a burn-in correction process such as predetermined image processing on the burn-in area determined by the burn-in area determination unit with respect to the latest latest image information. Further, the information processing apparatus transmits processed image information subjected to the burn-in correction process by the burn-in correction processing unit to the liquid crystal display device side via the information transmission unit.

Next, an image is displayed on the liquid crystal display device side as shown below.
That is, the drive control unit acquires processed image information transmitted from the information processing apparatus side.
And a drive control part applies a predetermined voltage to a liquid crystal element based on processed image information, and displays the optical image (image) based on processed image information.

  With the above configuration, the non-change area determination, the burn-in area determination, and the burn-in correction process are performed on the information processing apparatus side, and the processed image information processed on the information processing apparatus side is displayed on the liquid crystal display apparatus side. Since only the image obtained based on the acquired and processed image information is displayed, it is not necessary to newly provide a burn-in suppression circuit or the like in the hardware configuration of the liquid crystal display device as in the past, and the configuration of the liquid crystal display device is simplified. In addition, it is possible to effectively suppress image quality deterioration due to screen printing in the liquid crystal element while reducing the manufacturing cost. For example, when a personal computer (hereinafter referred to as a PC) is used as the information processing apparatus, the PC originally has a graphic processing function such as a GPU (Graphic Processing Unit), and therefore specially performs image processing. There is no need to provide a new function, and non-change area determination, burn-in area determination, and burn-in correction processing can be performed at high speed and with high accuracy by software control of a GPU or the like.

In the image display system of the present invention, the information processing apparatus includes a burn-in correction information storage unit that stores burn-in correction information regarding a plurality of groups in which all color tones are divided according to the level of a voltage value applied to the liquid crystal element. The non-change area determination unit compares each tone information included in the previous image information and the subsequent image information at a plurality of predetermined positions in each image corresponding to the previous image information and the subsequent image information, It is preferable to determine, as a non-change area, an area configured by positions where each color tone based on each color tone information belongs to the same group among the plurality of groups based on the burn-in correction information.
By the way, as a non-change region determination method, for example, each tone information included in each of the previous image information and the subsequent image information is compared at a predetermined plurality of positions in each image corresponding to the previous image information and the subsequent image information, A configuration is also conceivable in which a change amount of each color tone based on each color tone information is calculated, and an area constituted by a position where the change amount is equal to or less than a predetermined threshold is determined as a non-change area. However, with such a configuration, it is necessary to calculate the amount of change in each color tone and compare the amount of change with a predetermined threshold, which increases the processing load and makes it difficult to quickly determine the non-change region.
In the present invention, the information processing apparatus includes a printing correction information storage unit that stores printing correction information. Here, the burn-in correction information is information regarding a plurality of groups in which all color tones (for example, gradation values) are divided according to the level of the voltage value applied to the liquid crystal element. Then, the non-change region determination unit compares the color information of the previous image information and the subsequent image information at a predetermined plurality of positions, and each color tone based on each color information is the same among a plurality of groups based on the burn-in correction information. An area composed of positions belonging to the group is determined as a non-change area. As a result, the amount of change in each color tone as described above is calculated and compared with a configuration in which the amount of change is compared with a predetermined threshold to determine the non-change region. Can be judged.

By the way, screen burning in the liquid crystal element is more likely to occur as the voltage value applied to the liquid crystal element is higher.
Therefore, as the burn-in correction information, for example, it is preferable that the information is classified so that the number of color tones belonging to the group increases as the voltage value applied to the liquid crystal element increases. If the burn-in correction information is set in this way, the non-change area determination unit determines that the color group belonging to the high-level (high voltage level to be applied) group is the same group even if there is some variation. Thus, it is possible to accurately determine the non-change region. On the other hand, since the non-change area determination unit determines that the color tone belonging to the low level (low voltage level to be applied) group is a slight change even if it is a different group, it can avoid unnecessary determination of the non-change area. . Accordingly, the burn-in correction processing unit can appropriately perform the burn-in correction processing based on the non-change region accurately determined by the non-change region determination unit.

In the image display system of the present invention, the burn-in correction information is information in which the permissible periods are individually associated with the plurality of groups, and the burn-in area determination unit is the non-change area determination unit. A continuous period determined to be a non-change region, and the group to which each color tone based on each color information included in the previous image information and the subsequent image information and corresponding to the non-change region belongs It is preferable that an area where the duration is equal to or greater than the allowable period is determined as the burned area by comparing the associated allowable period.
By the way, the burning of the screen in the liquid crystal element tends to occur as shown below.
That is, when the voltage value applied to the liquid crystal element is high, baking occurs in a relatively short period. On the other hand, when the voltage value applied to the liquid crystal element is low, image sticking hardly occurs even when a voltage is applied to the liquid crystal element for a long period of time, compared to when the voltage value applied to the liquid crystal element is high.

  In the present invention, the burn-in correction information is information in which each allowable period is individually associated with a plurality of groups. For example, the burn-in correction information is information in which each allowable period is individually associated with each group so that the period becomes shorter as the voltage value applied to the liquid crystal element becomes higher. The burn-in area determination unit is associated with a group to which each color tone based on each color tone information corresponding to the non-change area belongs in the duration period and each color tone information included in the previous image information and the subsequent image information. The burn-in area is determined by comparing the allowable periods. As a result, the burn-in area determination unit can accurately determine the burn-in area in accordance with the occurrence tendency of screen burn-in in the liquid crystal element. Therefore, the burn-in correction processing unit can appropriately perform the burn-in correction process based on the burn-in area accurately determined by the burn-in area determination unit.

In the image display system of the present invention, it is preferable that the printing correction information storage unit stores the printing correction information for each of the predetermined plurality of positions compared by the non-change area determination unit.
By the way, the burning tendency of the screen in the liquid crystal element differs depending on the position (pixel position) in the screen.
In the present invention, the burn-in correction information storage unit stores the burn-in correction information for each of a plurality of predetermined positions to be compared by the non-change area determination unit. Thus, the non-change area determination unit and / or the burn-in area determination unit can more accurately determine the non-change area and / or the burn-in area by using the burn-in correction information according to the position. Therefore, the burn-in correction processing unit can appropriately perform the burn-in correction process based on the non-change area and / or the burn-in area determined more accurately.

In the image display system of the present invention, the burn-in correction processing unit performs the burn-in correction process by subtracting a predetermined offset value from the burn-in area with respect to the color tone information included in the latest image information. It is preferable to output the completed image information sequentially.
In the present invention, the burn-in correction processing unit performs the burn-in correction process by subtracting a predetermined offset value in the burn-in area with respect to the color tone information included in the latest image information. For this reason, on the liquid crystal display device side, a voltage based on the color tone information obtained by subtracting the offset value is applied to the burned area in the liquid crystal element. Therefore, a voltage that cancels the influence of the internal electric field can be applied to the burn-in area of the liquid crystal element, and the burn-in correction process can be performed with a simple process.

In the image display system of the present invention, the information processing apparatus includes a burn-in correction information storage unit that stores burn-in correction information regarding a plurality of groups in which all color tones are divided according to the level of a voltage value applied to the liquid crystal element. The printing correction information is information in which the offset values are individually associated with the plurality of groups, and the printing correction processing unit applies the printing to the color tone information included in the latest image information. The burn-in correction is performed by subtracting the offset value associated with the group to which each color tone based on the color tone information corresponding to the burn-in area is included in the previous image information and the subsequent image information, respectively. It is preferable to execute the processing and sequentially output the processed image information.
By the way, the burning of the screen in the liquid crystal element tends to occur as shown below.
That is, when the voltage value applied to the liquid crystal element is high, a strong internal electric field is generated by the liquid crystal. On the other hand, when the voltage value applied to the liquid crystal element is low, the generated internal electric field is smaller than when the voltage value applied to the liquid crystal element is high. Therefore, the strength of image sticking varies depending on the voltage value applied to the liquid crystal element.

  In the present invention, the information processing apparatus includes a printing correction information storage unit that stores printing correction information. Here, the burn-in correction information is information regarding a plurality of groups in which all color tones (for example, gradation values) are divided according to the level of the voltage value applied to the liquid crystal element. The burn-in correction information is information in which each offset value is individually associated with a plurality of groups. For example, the burn-in correction information is information in which each offset value whose value increases toward a group with a higher voltage value applied to the liquid crystal element is individually associated with each group. Then, the burn-in correction processing unit performs each of the color tone information included in the latest image information based on the color tone information corresponding to the burn-in area in the color tone information included in the previous image information and the subsequent image information. The burn-in correction process is performed by subtracting the offset value associated with the group to which the color tone belongs. As a result, the burn-in correction processing unit uses a relatively large offset value when a relatively strong internal electric field is generated in the liquid crystal, and compares it when a relatively weak internal electric field is generated in the liquid crystal. Thus, the burn-in correction process can be performed using a relatively small offset value, and the burn-in correction process can be appropriately performed in accordance with the tendency of the screen burn-in in the liquid crystal element.

In the image display system according to the aspect of the invention, the information processing apparatus includes the burn-in correction information regarding a plurality of groups in which all the colors are divided according to the level of the voltage value applied to the liquid crystal element, and the inter-group information regarding the different groups. A burn-in correction information storage unit that stores offset value information associated with each offset value individually, and the burn-in correction processing unit performs the color tone information included in the latest image information with respect to the color tone information. A pre-transition group to which each color tone based on each color tone information corresponding to the burn-in area, which is included in the previous image information and the subsequent image information, respectively, is included in the burn-in area, and the latest image information is included in the burn-in area. The inter-group information related to the group with the transition destination group to which the color tone belongs based on the corresponding color tone information The baking correction processing by implementing the processed image information sequentially by subtracting the offset value associated, it is preferable to output.
By the way, when image sticking occurs on the screen of the liquid crystal element, the voltage value (corresponding to the color tone) applied to the liquid crystal element at the time of occurrence and the voltage value (corresponding to the color tone) applied to the liquid crystal element after the occurrence are generated. Depending on the change width, even if the internal electric field generated in the liquid crystal is the same, the printing effect recognized by the user is different.

  In the present invention, the burn-in correction information storage unit stores burn-in correction information and offset value information. Here, the burn-in correction information is information regarding a plurality of groups in which all color tones (for example, gradation values) are divided according to the level of the voltage value applied to the liquid crystal element. The offset value information is information in which each offset value is individually associated with the inter-group information regarding different groups. For example, as offset value information, information between groups having a large difference (difference between levels) between a group having a high voltage value applied to the liquid crystal element and a group having a low voltage value applied to the liquid crystal element is larger. It is information associated with an offset value. Then, the burn-in correction processing unit belongs to each color tone based on each color tone information corresponding to the burn-in area included in the previous image information and the subsequent image information, which corresponds to the voltage value applied to the liquid crystal element when the burn-in occurred. Recognize the group before transition. Further, the burn-in correction processing unit recognizes a transition destination group to which a color tone based on the color tone information corresponding to the burn-in area included in the latest image information corresponding to the voltage value applied to the liquid crystal element after the occurrence of the burn-in belongs. Then, the burn-in correction processing unit subtracts the offset value associated with the inter-group information of the recognized pre-transition group and the transition-destination group from the color tone information included in the latest image information to the burn-in area. Perform the process. As a result, when the variation range between the voltage value applied to the liquid crystal element at the time of occurrence of baking and the voltage value applied to the liquid crystal element after generation is relatively large in the burn-in correction processing unit, a relatively large offset. If the change width is relatively small, the burn-in correction process can be performed using a relatively small offset value, and the burn-in correction process can be appropriately performed so that the effect of the burn-in is not recognized by the user.

In the image display system of the present invention, the burn correction processing unit is configured to reduce the offset value gradually with respect to the latest image information after the burn region determination unit determines the burn region. It is preferable to perform burn-in correction processing and sequentially output processed image information.
By the way, the intensity of the internal electric field generated in the liquid crystal when the screen is burned on the liquid crystal element decreases with time.
In the present invention, after the burn-in area determination unit determines the burn-in area, the burn-in correction processing unit performs the burn-in correction process while gradually reducing the offset value to be used. As a result, the burn-in correction process corresponding to the time change of the internal electric field generated in the liquid crystal can be performed, and the burn-in correction process can be performed more appropriately.

In the image display system of the present invention, the printing correction processing unit changes the color tone based on the color tone information within a predetermined range in the printing area with respect to the color tone information included in the latest image information. It is preferable to perform correction processing and sequentially output the processed image information whose color tone varies within the predetermined range.
In the present invention, the burn-in correction processing unit corrects the burn-in by changing the color tone based on the color tone information within a predetermined range to a burn-in area where the burn-in can occur in the liquid crystal element with respect to the color tone information included in the latest image information. Processing is performed, and processed image information whose color tone fluctuates within a predetermined range is sequentially output. For this reason, on the liquid crystal display device side, the voltage value is applied while changing the voltage value within a predetermined range to the burn-in area where the burn-in in the liquid crystal element can occur. Therefore, it is possible to avoid applying a certain voltage to the burn-in area where burn-in can occur in the liquid crystal element, that is, it is possible to efficiently suppress the occurrence of burn-in on the screen in the liquid crystal element.

In the image display system of the present invention, the burn correction processing unit applies a Cb value and a Cr value to the burn area while keeping the Y value in the YCbCr color space constant for the color tone information included in the latest image information. The burn-in correction process is performed by changing within a predetermined range, and the processed image information in which the Y value in the YCbCr color space is constant and the Cb value and the Cr value vary within the predetermined range is sequentially output. It is preferable to do.
In the present invention, the burn-in correction processing unit applies the Cb value and the Cr value while keeping the Y value in the YCbCr color space constant in the burn-in area where the burn-in can occur in the liquid crystal element with respect to the color tone information included in the latest image information. Is changed within a predetermined range, and a burn-in correction process is performed, and processed image information in which the Y value in the YCbCr color space is constant and the Cb value and the Cr value vary within the predetermined range is sequentially output. As a result, the image displayed on the liquid crystal display device has a constant Y value in the YCbCr color space, so that the burn correction processing unit can perform the burn correction processing without being recognized by the user.

In the image display system of the present invention, the information processing device includes an image correction processing unit that performs a predetermined image correction process on the image information, and image information that has been subjected to image correction processing by the image correction processing unit. The non-change area determination unit is configured to sequentially store the image information storage unit, and the non-change region determination unit includes a conventional image corresponding to an optical image displayed on the liquid crystal element among the image information stored in the image information storage unit. Each tone information included in the image information and the subsequent image information after the previous image information subjected to the image correction processing by the image correction processing unit corresponds to the previous image information and the subsequent image information. It is preferable that a comparison is made at a plurality of predetermined positions in each image, and an area constituted by positions at which changes in the color tone information have a predetermined relationship is determined as a non-change area.
In the present invention, the information processing apparatus sequentially executes, for example, an image correction processing unit that performs an image correction process such as a shape conversion process and a color tone correction process, and image information that has been subjected to the image correction process by the image correction process unit. And an image information storage unit for storing. Then, the non-change area determination unit determines the non-change area based on the previous image information stored in the image information storage unit and the subsequent image information subjected to the image correction processing in the image correction processing unit. Accordingly, the non-change area determination unit determines the non-change area after the image correction process is performed on the image information. For example, the non-change area is determined before the image correction process is performed. Compared with the configuration, the non-change region can be determined more accurately. Accordingly, the burn-in correction processing unit can appropriately perform the burn-in correction processing based on the non-change region accurately determined by the non-change region determination unit.

The image display system of the present invention includes an imaging device that captures an image displayed on the liquid crystal display device, and the information processing device sequentially stores image information related to the image captured by the imaging device. An information storage unit, wherein the non-change area determination unit includes the previous image information corresponding to the optical image displayed on the liquid crystal element among the image information stored in the image information storage unit; Each tone information included in each subsequent image information after the image information is compared at a plurality of predetermined positions in each image corresponding to the previous image information and the subsequent image information, and a change in each tone information is detected. It is preferable to determine an area composed of positions having a predetermined relationship as a non-change area.
In the present invention, the image display system includes an imaging device. In addition, the information processing apparatus includes an image information storage unit that sequentially stores image information regarding images captured by the imaging apparatus. Then, the non-change area determination unit determines the non-change area based on the previous image information and the subsequent image information stored in the image information storage unit. Thus, for example, even when a predetermined image correction process is performed on the processed image information on the liquid crystal display device side, the image subjected to the image correction process is captured by the imaging device. Since the non-change area determination unit determines the non-change area based on the previous image information and the subsequent image information captured by the imaging device, the non-change area can be determined more accurately. Accordingly, the burn-in correction processing unit can appropriately perform the burn-in correction processing based on the non-change region accurately determined by the non-change region determination unit.

  An image display system according to the present invention includes an information processing device that processes image information, and an optical device that changes an alignment state of liquid crystals by applying a voltage and modulates an incident light beam for each pixel according to the alignment state of the liquid crystals. Liquid crystal element for displaying image, liquid crystal display device having drive control unit for applying voltage based on color tone information for each pixel representing color tone included in image information to liquid crystal element, information processing device, and image display device An information display system comprising information transmission means for connecting information to each other so that information can be transmitted and received, wherein the information processing apparatus includes conventional image information corresponding to an optical image displayed on the liquid crystal element, and Each tone information included in the subsequent image information one after the previous image information is compared at a predetermined plurality of positions in each image corresponding to the previous image information and the subsequent image information, A non-change area determination unit that determines an area constituted by a position where each change in color tone information has a predetermined relationship as a non-change area, and the non-change area determination section continuously determines that the area is a non-change area. A burn-in area that compares the determined duration and a predetermined permissible period, determines an area where the duration is equal to or greater than the permissible period as a screen burn-in area in the liquid crystal element, and outputs burn-in area information related to the burn-in area A determination unit, wherein the liquid crystal display device acquires printing area information related to the printing area determined by the printing area determination unit, and applies the latest image information to a printing area based on the printing area information. A burn-in correction processing unit that performs burn-in correction processing and outputs processed image information; and the drive control unit includes the processed image information Based wherein the displaying an optical image based on the processed image information by applying a predetermined voltage to the liquid crystal element.

Here, in the determination of the non-change region in the non-change region determination unit, the tone information included in the previous image information and the subsequent image information may be compared at a plurality of positions in each image, and the comparison is made for every pixel position. A configuration may be employed, or a configuration in which comparison is performed only at a plurality of pixel positions may be employed.
The information transmission means is not limited to a standard for transmitting information by wire such as a USB cable or a LAN cable, but also includes a standard for transmitting information via a wireless medium (radio wave, sound, infrared, etc.).

According to the present invention, in the image display system, the information processing apparatus includes a non-change area determination unit and a burn-in area determination unit, and the liquid crystal display apparatus includes a liquid crystal element, a drive control unit, and a burn-in correction processing unit. As shown below, an image can be displayed on the liquid crystal display device.
First, on the information processing apparatus side, image information is processed and transmitted as shown below.
That is, the non-change area determination unit compares each color tone information included in each of the previous image information and the subsequent image information at a predetermined plurality of positions in each image corresponding to the previous image information and the subsequent image information. An area composed of positions where changes have a predetermined relationship is determined as a non-change area.
Then, the burn-in area determination unit continuously determines the duration (for example, the number of frames, etc.) determined to be the non-change area by the non-change area determination unit, and the predetermined allowable period (for example, the number of frames, etc.). In comparison, an area where the duration is equal to or longer than the allowable period is determined as a burn-in area in which the screen of the liquid crystal element has burned or can be burned. Further, the information processing apparatus transmits, to the liquid crystal display device side, the burn-in area information related to the burn-in area determined by the burn-in area determination unit via the information transmission unit.

Next, an image is displayed on the liquid crystal display device side as shown below.
That is, the burn correction processing unit acquires burn area information transmitted from the information processing apparatus side.
The burn-in correction processing unit performs burn-in correction processing on the burn-in area based on the burn-in area information with respect to the latest latest image information, and outputs processed image information.
The drive control unit applies a predetermined voltage to the liquid crystal element based on the processed image information, and causes the liquid crystal element to display an optical image (image) based on the processed image information.

In recent years, a configuration has been proposed in which a graphic processing function such as a GPU is provided on the liquid crystal display device side, and predetermined image correction processing is performed on image information on the liquid crystal display device side.
For example, by adding the function of a burn-in correction processing unit that performs burn-in correction processing to a GPU or the like provided in a liquid crystal display device, a new burn-in suppression circuit or the like is added to the hardware configuration of the liquid crystal display device as in the past. There is no need to provide it, and it is possible to effectively suppress image quality deterioration due to screen burning in the liquid crystal element while simplifying the configuration of the liquid crystal display device and reducing the manufacturing cost. Further, the burn-in correction process can be performed at high speed and with high accuracy by software control of a GPU or the like.

An image display method according to the present invention includes an information processing apparatus that processes image information, and an optical state in which an arrangement state of liquid crystals is changed by applying a voltage, and an incident light beam is modulated for each pixel according to the arrangement state of the liquid crystals. A liquid crystal element that displays an image, and a drive control unit that applies to the liquid crystal element a voltage based on color tone information for each pixel representing a color tone included in the image information based on the image information processed by the information processing device An image display method using an image display system comprising: a liquid crystal display device having information; and an information transmission means for connecting the information processing device and the image display device so as to be able to transmit and receive information. The previous image information corresponding to the optical image displayed on the liquid crystal element, and the respective pieces of color tone information included in the subsequent image information immediately after the previous image information are converted into the previous image information. And a non-change area determination step of determining, as a non-change area, an area formed by a position where a change in each tone information has a predetermined relationship by comparing at a plurality of predetermined positions in each image corresponding to the subsequent image information And a continuous period determined to be a non-change area in the non-change area determination step and a predetermined allowable period, and a region where the continuous period is equal to or greater than the allowable period is displayed on the screen of the liquid crystal element A burn-in area determination step for determining as a burn-in area, and a burn-in correction process for performing burn-in correction processing on the burn-in area determined in the burn-in area determination step for the latest latest image information and outputting processed image information The liquid crystal display device executes a processed image information acquisition step for acquiring the processed image information, Based on the processed image information and executes an image display step of displaying an optical image based on said processed image information to the liquid crystal element by applying a predetermined voltage.
Since the above-described image display method of the present invention is performed by the above-described image display system, the same operations and effects as those of the above-described image display system can be enjoyed.

An image display method according to the present invention includes an information processing apparatus that processes image information, and an optical state in which an arrangement state of liquid crystals is changed by applying a voltage, and an incident light beam is modulated for each pixel according to the arrangement state of the liquid crystals. Liquid crystal element for displaying image, liquid crystal display device having drive control unit for applying voltage based on color tone information for each pixel representing color tone included in image information to liquid crystal element, information processing device, and image display device An image display method using an image display system comprising an information transmission means for connecting information to each other so that information can be transmitted and received, wherein the information processing apparatus corresponds to an optical image displayed on the liquid crystal element. Each tone information included in the previous image information and the subsequent image information immediately after the previous image information is converted into a predetermined complex in each image corresponding to the previous image information and the subsequent image information. The non-change area determination step for determining, as the non-change area, the area constituted by the positions where the changes in the color tone information have a predetermined relationship are compared with each other in the position and the non-change area determination step. By comparing the continuation period determined to be a change area and a predetermined permissible period, an area where the continuation period is equal to or greater than the permissible period is determined as a screen burn area in the liquid crystal element, and the burn area information regarding the burn area The liquid crystal display device performs a printing area information acquisition step for acquiring the printing area information and a printing area based on the printing area information with respect to the latest latest image information. Burn-in correction processing step for performing burn-in correction processing and outputting processed image information, and the processed image information Based and executes an image display step of displaying an optical image based on said processed image information to the liquid crystal element by applying a predetermined voltage.
Since the above-described image display method of the present invention is performed by the above-described image display system, the same operations and effects as those of the above-described image display system can be enjoyed.

An information processing apparatus according to the present invention includes a liquid crystal element that displays an optical image by changing an alignment state of liquid crystals by applying a voltage and modulating an incident light beam for each pixel according to the alignment state of the liquid crystals, and image information. The image information is output to a liquid crystal display device having a drive control unit that applies a voltage based on color tone information for each pixel representing the color tone included in the liquid crystal element, and an optical image based on the image information is displayed on the liquid crystal element An information processing apparatus for executing each color tone information included in a previous previous image information corresponding to an optical image displayed on the liquid crystal element and a subsequent image information immediately after the previous image information. A comparison is made at a plurality of predetermined positions in each image corresponding to the image information and the subsequent image information, and an area constituted by positions at which the change in each tone information has a predetermined relationship is determined as a non-change area. The non-change area determination unit that compares the continuous period determined by the non-change area determination unit to be a non-change area and a predetermined allowable period, and the continuous period is equal to or greater than the allowable period A burn-in area determination unit that determines the area as a burn-in area on the screen of the liquid crystal element, and a burn-in correction process performed on the burn-in area determined by the burn-in area determination unit for the latest latest image information And a burn-in correction processing unit that outputs image information.
The information processing apparatus of the present invention described above can be an information processing apparatus suitable for the image display system described above.

  The control program according to the present invention includes a liquid crystal element that changes an alignment state of liquid crystals by applying a voltage and modulates an incident light beam for each pixel according to the alignment state of the liquid crystal to display an optical image, and image information. The image information is output to a liquid crystal display device having a drive control unit that applies a voltage based on color tone information for each pixel representing the color tone included to the liquid crystal element, and an optical image based on the image information is displayed on the liquid crystal element. A control program for an information processing apparatus, comprising: a computer incorporated in the information processing apparatus; previous previous image information corresponding to an optical image displayed on the liquid crystal element; and one after the previous image information Each color tone information included in each subsequent image information is compared at a predetermined plurality of positions in each image corresponding to the previous image information and the subsequent image information. A non-change region determination step for determining a region constituted by a position having a predetermined relationship as a non-change region, and a continuation period determined in the non-change region determination step as a non-change region and a predetermined value A printing area determination step for determining an area where the duration is equal to or greater than the allowable period as a screen printing area in the liquid crystal element, and the printing area determination for the latest latest image information. A printing correction processing step of performing printing correction processing on the printing area determined in the step and outputting processed image information is executed.

  The recording medium of the present invention is characterized in that the control program described above is recorded in a computer readable manner.

  Since the control program and the recording medium configured as described above are used to implement the image display method described above, the same operations and effects as those of the image display method described above can be enjoyed.

The liquid crystal display device according to the present invention includes a liquid crystal element that changes an alignment state of liquid crystals when a voltage is applied and modulates an incident light beam for each pixel according to the alignment state of the liquid crystals to display an optical image, and image information A liquid crystal display device having a drive control unit that applies a voltage based on color tone information for each pixel representing a color tone included in the liquid crystal element, and acquires burn-in area information regarding a burn-in area of a screen in the liquid crystal element. A burn-in correction processing unit that performs burn-in correction processing on the burn-in area based on the burn-in area information and outputs processed image information, and the drive control unit adds the burn-in correction process to the processed image information. Based on this, a predetermined voltage is applied to the liquid crystal element to display an optical image based on the processed image information.
The liquid crystal display device of the present invention described above can be a liquid crystal display device suitable for the above-described image display system.

In the liquid crystal display device of the present invention, each previous color image information included in the previous previous image information corresponding to the optical image displayed on the liquid crystal element and the subsequent image information immediately after the previous image information is stored in the previous color information. A non-change area for determining, as a non-change area, an area constituted by a position where a change in each color tone information has a predetermined relationship by comparing at a plurality of predetermined positions in each image corresponding to the image information and the subsequent image information The determination unit and the continuous period determined to be a non-change area by the non-change area determination unit and a predetermined allowable period are compared, and an area where the continuous period is equal to or greater than the allowable period is determined as the liquid crystal It is preferable to include a burn-in area determination unit that determines the burn-in area of the screen in the element.
According to the present invention, since the liquid crystal display device includes the non-change area determination unit, the burn-in area determination unit, and the burn-in correction processing unit, all the configurations for performing the burn-in correction process are provided in the liquid crystal display device. Thus, even if the liquid crystal display device is not connected via the information processing device and the information transmission means described above, not only the burn-in correction processing but also the image correction processing such as the shape conversion processing and the color tone correction processing, etc. All processing is possible, and convenience can be improved.

  The control program according to the present invention includes a liquid crystal element that changes an alignment state of liquid crystals by applying a voltage and modulates an incident light beam for each pixel according to the alignment state of the liquid crystal to display an optical image, and image information. A control program for a liquid crystal display device having a drive control unit for applying a voltage based on color tone information for each pixel representing a color tone included to the liquid crystal element, in a computer incorporated in the liquid crystal display device, in the liquid crystal element A printing area information acquisition step for acquiring printing area information related to a printing area on the screen, and a burn correction process on the printing area based on the printing area information for the latest latest image information, and output processed image information A printing correction processing step, and applying a predetermined voltage to the liquid crystal element based on the processed image information to Characterized in that to execute an image display step of displaying an optical image based on the processed image information.

  The recording medium of the present invention is characterized in that the control program described above is recorded in a computer readable manner.

  Since the control program and the recording medium configured as described above are used to implement the image display method described above, the same operations and effects as those of the image display method described above can be enjoyed.

[First embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Configuration of the projection system]
FIG. 1 is an external view of a projection system 1 as an image display system.
As shown in FIG. 1, the projection system 1 performs a predetermined image processing on an image of a video source and outputs an image data signal, and then displays an image data signal based on the image data signal from the PC 2 and the PC 2. A projector 3 as a liquid crystal display device that generates an image frame and projects it toward the screen Sc, and a USB cable 4 as an information transmission means for connecting the PC 2 and the projector 3 so as to be able to transmit and receive data are provided.
The information transmission means may be any means having a signal transmission path capable of transmitting a digital signal. In addition to a USB cable, each standard for transmitting a digital signal by wire such as a LAN cable, a wireless medium (radio wave, Standards for transmitting digital signals via sound, infrared rays, etc. may be adopted.

[Configuration of PC]
FIG. 2 is a block diagram showing a schematic configuration of the PC 2.
As shown in FIG. 2, the PC 2 is roughly composed of an operation unit 21, a display unit 22, and a control device 23.
The operation unit 21 includes various operation buttons that are input and operated using, for example, a keyboard and a mouse. By performing the input operation of the operation buttons, the control device 23 is appropriately operated, and for example, the operation content of the control device 23 is set for the information displayed on the display unit 22. Then, a predetermined operation signal is appropriately output from the operation unit 21 to the control device 23 by an input operation of the operation unit 21 by the user.
The operation unit 21 is not limited to the input operation of the operation button, and can be configured to input various conditions by, for example, an input operation using a touch panel or an input operation using voice.

  The display unit 22 is controlled by the control device 23 and displays predetermined information. For example, when setting or inputting information to be stored in a memory to be described later of the control device 23 by display of information processed by the control device 23 or an input operation of the operation unit 21, the information is output from the control device 23. The data in the memory is displayed as appropriate. For example, liquid crystal, organic EL (Electroluminescence), PDP (Plasma Display Panel), CRT (Cathode-Ray Tube) or the like is used for the display unit 22.

The control device 23 executes a predetermined program according to the input of the operation signal from the operation unit 21 and controls the entire PC 2. As shown in FIG. 2, the control device 23 includes a USB controller 231, a main memory 232, an auxiliary memory 233, an image correction parameter storage unit 234, an image processing unit 235, a control unit main body 236, and a burn-in correction. An information storage unit 237 and an image information storage unit 238 are provided. These components 231 to 238 are connected by a bus (not shown) so that necessary information can be transmitted.
The USB controller 231 is electrically connected to the projector 3 via the USB cable 4 by connecting the USB cable 4 to the USB connector C1 on the PC 2 side (FIG. 2) and the USB connector C2 on the projector 3 side (see FIG. 4). Is connected to the projector 3 and inputs / outputs data with the projector 3 according to the USB standard.
Here, although USB (USB cable 4) is not specifically illustrated, it is configured by a D + / D− signal line and four lines of VCC (+5 V) and GND of a power supply line as a power transmission path. . Data can be input / output to / from the projector 3 via USB (USB cable 4), and power is supplied to the projector 3 from a power supply unit (processing device side power supply unit) (not shown) inside the PC 2 via a power supply line. Can be supplied.
In this embodiment, since the USB cable 4 is employed as the information transmission means, the control device 23 is provided with the USB controller 231. However, when a standard other than the USB cable 4 is employed as the information transmission means, A transmission / reception unit that enables transmission / reception of data according to the standard may be provided.

The main memory 232 stores various data. Examples of the various data include an operation signal output from the operation unit 21, data input via the USB controller 231, data to be processed by the image processing unit 235, the control unit main body 236, and the like.
As the auxiliary memory 233, a video source medium is used. For example, a DVD (Digital Versatile Disc) in which video and audio are recorded as digital data can be exemplified.
The image correction parameter storage unit 234 stores correction parameters for image correction according to the characteristics of the projector 3.
Examples of correction parameters stored in the image correction parameter storage unit 234 include various correction parameters for trapezoidal correction, luminance unevenness, color unevenness, γ correction, and the like.

  The correction parameters may be installed in the image correction parameter storage unit 234 by inserting a memory card or CD-ROM in which these correction parameters are recorded into the PC 2. Alternatively, the PC 2 may read predetermined correction parameters from the projector 3 via the USB cable 4 and store them in the image correction parameter storage unit 234.

The burn-in correction information storage unit 237 stores burn-in correction information for performing a screen burn-in correction process in a liquid crystal light valve, which will be described later, constituting the projector 3 in the image processing unit 235.
FIG. 3 is a diagram illustrating an example of the burn-in correction information.
As shown in the example of FIG. 3, the burn-in correction information includes a plurality of groups (in FIG. 3, 10 gradations in FIG. 3) according to the level of the voltage value applied to the liquid crystal light valve. Information). Here, as shown in the example of FIG. 3, all the color tones belong to groups as the voltage value applied to the liquid crystal light valve increases (in the example of FIG. 3, toward the higher gradation). It is divided so that the number of keys increases. That is, as shown in the example of FIG. 3, when the group name is “0”, seven gradations from 0 gradation to 6 gradations belong, and when the group name is “1”, ten gradations from 7 gradations to 16 gradations belong. If the group name is “2”, 14 gradations of 17 gradations to 30 gradations belong, and the number of gradations to which the gradations belong increases in order toward the group to which the higher gradations belong. ing.

  The image information storage unit 238 sequentially stores the image data subjected to the shape conversion process and the color tone correction process in the image processing unit 235.

  The control unit main body 236 includes, for example, a CPU (Central Processing Unit) and the like, and is a part that controls the entire PC 2 according to a predetermined program stored in the main memory 232 or the like.

The image processing unit 235 includes, for example, a GPU (Graphic Processing Unit) and the like, performs image correction processing on the image data using the correction parameters described above, and prints using the above-described burn-in correction information. This is the part that performs the correction process. As shown in FIG. 2, the image processing unit 235 includes an image generation unit 2351, a shape conversion processing unit 2352, a color tone correction processing unit 2353, a non-change area determination unit 2354, a printing area determination unit 2355, and a printing process. A correction processing unit 2356 and the like are provided. The shape conversion processing unit 2352 and the color tone correction processing unit 2353 correspond to the image correction processing unit according to the present invention.
The image generation unit 2351 performs decompression on the video source from the auxiliary memory 233 according to the recording method, and decodes the image data for each frame. For example, image information (image data) in which 8-bit color tone information (color tone data) is given to each pixel is obtained by decoding. Then, the image generation unit 2351 outputs the decoded image data to the shape conversion processing unit 2352.

  The shape conversion processing unit 2352 performs shape conversion processing on the image data decoded by the image generation unit 2351, that is, trapezoid correction, correction performed according to the shape of the screen Sc when the screen Sc is a curved surface, and the projector 3 Correct distortion caused by the built-in lens. Then, the shape conversion processing unit 2352 outputs the image data subjected to the shape conversion processing to the color tone correction processing unit 2353.

  The color tone correction processing unit 2353 converts and corrects the color tone data of the image data corresponding to the color characteristics of the projector 3 with respect to the image data output from the shape conversion processing unit 2352 (color tone correction processing). Examples of the color tone correction process include color conversion, γ correction, VT-γ correction, color unevenness correction, and the like. For example, by performing a color tone correction process, the color tone data that was originally 8 bits is corrected to an accuracy of 10 bits or more. Then, the color tone correction processing unit 2353 sequentially stores the image data subjected to the above-described image correction processing (shape conversion processing and color tone correction processing) in the image information storage unit 238. As the stored image data, the latest several frames are sufficient, and the older ones are deleted sequentially. Further, the color tone correction processing unit 2353 sequentially applies the image data (latest image data) subjected to the above-described image correction processing (shape conversion processing and color tone correction processing) to the non-change area determination unit 2354 and the burn-in correction processing unit 2356. Output.

The non-change area determination unit 2354 sequentially outputs the latest image data (subsequent image data) output from the color tone correction processing unit 2353 and the latest image data among several frames of image data stored in the image information storage unit 238. Each tone data included in the previous previous image data is compared over all pixels for each corresponding pixel, and an area composed of pixel positions in which changes in each tone data have a predetermined relationship is obtained. It is determined as a non-change area.
More specifically, in the present embodiment, the non-change area determination unit 2354 compares the color tone data included in the latest image data and the previous image data over all pixels for each corresponding pixel, A region constituted by pixel positions in which each color tone based on data (tone value in the example of FIG. 3) belongs to the same group among a plurality of groups based on the burn-in correction information is determined as a non-change region.

The burn-in area determination unit 2355 counts the duration of the non-change area (for example, the number of frames). Also, the burn-in area determination unit 2355 determines an area where the counted duration is equal to or longer than a predetermined allowable period (for example, the number of frames) as a burn-in area where burn-in has occurred on the screen of the liquid crystal light valve.
In the present embodiment, the allowable period is set as a single value and is stored in the main memory 232 or the like, for example.

The printing correction processing unit 2356 sequentially subtracts a predetermined offset value from the color tone data included in the latest image data output from the color tone correction processing unit 2353 to the printing region determined by the printing region determination unit 2355. The burn-in correction process is performed. Then, after the burn-in area determination unit 2355 determines the burn-in area, the burn-in correction processing unit 2356 continuously outputs from the color tone correction processing unit 2353 continuously for a predetermined correction period (for example, a predetermined number of frames). The burn-in correction process described above is performed on the latest image data to be processed, and processed image data is sequentially output. The processed image data is sequentially transmitted to the projector 3 via the USB controller 231 and the USB cable 4.
Note that, as described above, the burn-in correction processing unit 2356 performs the burn-in correction process on the latest image data continuously for the correction period after the burn-in area determination unit 2355 determines the burn-in area. During the correction period, even when the printing area determination unit 2355 has not determined the printing area, the latest image data is subjected to the printing correction process and the processed image data is sequentially output during the correction period. .
Also, the burn-in correction processing unit 2356 displays the latest image in a state where the burn-in area has not been determined by the burn-in area determination unit 2355 after the correction period has elapsed after the burn-in area determination unit 2355 has determined the burn-in area. The latest image data is sequentially output as processed image data without performing burn-in correction processing on the data.
In the present embodiment, the offset value is set as a single value and stored in the main memory 232 or the like, for example.

[Configuration of projector]
FIG. 4 is a block diagram showing a schematic configuration of the projector 3.
As shown in FIG. 4, the projector 3 is roughly composed of an image projection unit 31 and a control device 32.
Under the control of the control device 32, the image projection unit 31 forms an optical image and enlarges and projects it on the screen Sc. As shown in FIG. 4, the image projection unit 31 includes a light source device 311, a liquid crystal light valve 312 as a liquid crystal element, a projection optical device 313, and the like.
The light source device 311 emits a light beam toward the liquid crystal light valve 312 under the control of the control device 32. The light source device 311 includes a light source lamp 3111 and a lamp driver 3112.

The light source lamp 3111 is composed of an ultra high pressure mercury lamp. It should be noted that other discharge light source lamps such as a metal halide lamp and a xenon lamp may be employed in addition to the ultra-high pressure mercury lamp. Furthermore, not only a discharge light source lamp, but various self-light emitting elements such as a light emitting diode, a laser diode, an organic EL element, and a silicon light emitting element may be employed.
The lamp driver 3112 drives the light source lamp 3111 with a predetermined driving voltage under the control of the control device 32.

The liquid crystal light valve 312 is a transmissive liquid crystal panel, and an alignment state of liquid crystals (liquid crystal molecules) sealed in a liquid crystal cell (not shown) is applied by applying a voltage based on a drive signal from the control device 32. By changing or changing the light flux emitted from the light source lamp 3111, the optical image corresponding to the processed image data processed by the PC 2 is emitted to the projection optical device 313.
Here, when a substantially constant DC voltage is applied to the liquid crystal for a long time, an internal electric field may be generated and fixed in the liquid crystal. That is, even when the applied voltage is changed, the information displayed before is displayed by the internal electric field generated in the liquid crystal, and the display mark of the image remains like an afterimage. A problem, so-called burning, occurs. The burn-in correction process in the PC 2 described above is to correct burn-in that occurs in the liquid crystal light valve 312.

The projection optical device 313 enlarges and projects the optical image emitted from the liquid crystal light valve 312 toward the screen Sc.
Although not shown, the projector 3 includes three liquid crystal light valves 312 corresponding to the three colors RGB. Further, the light source device 311 includes a color light separation optical system that separates light source light into three colors of light. Further, the projection optical device 313 has a combining optical system that generates an optical image representing a color image by combining three color image lights. As for the configuration of such an optical system, various general projector optical system configurations can be used.

The control device 32 controls the entire projector 3 in accordance with a control command from the PC 2 side. As shown in FIG. 4, the control device 32 includes a USB controller 321, an image correction parameter storage unit 322, a control unit main body 323, and the like. These components 321 to 323 are connected by a bus (not shown) so that necessary information can be transmitted.
The USB controller 321 is the same as the USB controller 231 of the PC 2, and the projector 3 is connected via the USB cable 4 by connecting the USB cable 4 to the USB connector C 1 on the PC 2 side and the USB connector C 2 on the projector 3 side. Is connected to the projector 3 and inputs / outputs data with the projector 3 according to the USB standard.
In this embodiment, since the USB cable 4 is used as the information transmission unit, the USB controller 321 is provided in the control device 32. However, when a standard other than the USB cable 4 is used as the information transmission unit, A transmission / reception unit that can perform transmission / reception of data according to the standard may be provided.

The image correction parameter storage unit 322 stores correction parameters for image correction according to the characteristics of the projector 3, and examples of the correction parameters include keystone correction, luminance unevenness, color unevenness, and γ correction. Various parameters can be exemplified.
When the PC 2 and the projector 3 are connected by the USB cable 4, the PC 2 reads out the correction parameter information stored in the image correction parameter storage unit 322 and stores it in the image correction parameter storage unit 234.

The control unit main body 323 includes, for example, a CPU, and is a part that controls the entire projector 3 in accordance with a control command from the PC 2 side and a program stored in a memory (not shown). As shown in FIG. 4, the control unit main body 323 includes a liquid crystal panel drive control unit 3231 as a drive control unit.
The liquid crystal panel drive control unit 3231 acquires the processed image data transmitted from the PC 2 side, outputs a drive signal based on the processed image data, and outputs a voltage based on the color tone data included in the processed image data. Applied to the light valve 312 to form an optical image based on the processed image data.

[Projection system operation]
Next, the operation of the above-described projection system 1 will be described with reference to the drawings.
FIG. 5 is a flowchart for explaining the operation of the projection system 1.
In the following, among the operations of the projection system 1, the operation of the burn correction process will be mainly described, and the description of the other operations will be omitted.
In the following, the PC 2 and the projector 3 are connected in advance by the USB cable 4, and image data is sequentially transmitted from the PC 2 side to the projector 3 side, and an optical image based on the image data is projected from the projector 3 onto the screen Sc. (Displayed).

FIG. 6 is a diagram illustrating an example of a method for determining the non-change area and the burn-in area. In FIG. 6, only 16 pixels are used to simplify the description, and a method for determining the non-change area and the burn-in area with only 16 pixels will be described below. Further, the three data shown on the lower side of FIG. 6 indicate image data to be compared, and the two data shown on the upper side of FIG. 6 indicate data indicating the comparison result of the image data. Further, the numerical value of each image data shown on the lower side of FIG. 6 indicates the value of tone data (tone value), and the numerical value of each data shown on the upper side of FIG. 6 indicates the duration (number of continued frames). Yes.
First, the non-change area determination unit 2354 is one of the latest image data among the latest image data sequentially output from the color tone correction processing unit 2353 and several frames of image data stored in the image information storage unit 238. Each tone data included in the previous previous image data is compared for each corresponding pixel (step S1).

After step S1, the non-change area determination unit 2354 determines whether there is a pixel position in which each color tone based on each color tone data belongs to the same group among a plurality of groups based on the burn-in correction information (step S1). S2).
In step S2, if the non-change area determination unit 2354 determines “Y”, that is, if it is determined that each color tone belongs to the same group based on the burn-in correction information, the pixel An area composed of positions is determined as a non-change area (step S3).
That is, the processing of steps S1 to S3 described above corresponds to the non-change region determination step according to the present invention.

After step S3, the burn-in area determination unit 2355 updates the count value of the duration period (step S4).
For example, in the example shown in FIG. 6, the center image data D2 of the three image data D1, D2, and D3 is the latest image data output from the color tone correction processing unit 2353, and the leftmost image data D1 is the latest image data. In the case of the subordinate image data one before, it is processed as shown below.

In step S3, in the example shown in FIG. 6, the gradation value (200) of the latest image data D2 at each pixel position P1 to P4 and the gradation value (200) of the previous image data D1 at each pixel position P1 to P4. Belong to the same group in the burn-in correction information (group name: 9 in the example shown in FIG. 3), the non-change area determination unit 2354 determines the area A1 formed by the pixel positions P1 to P4 as the non-change area. Judge as.
In step S4, in the example shown in FIG. 6, the burn-in area determination unit 2355 increases the count value of the duration (the number of frames continued) of the non-change area A1 determined by the non-change area determination unit 2354. 1 ”. Further, the burn-in area determination unit 2355 initializes the count value of the change area A2 configured by the pixel positions P5 to P16 other than the non-change area A1, and sets it to “0”.

Similarly, for example, in the example shown in FIG. 6, the latest image data output from the color tone correction processing unit 2353 is the rightmost image data D3 of the three image data D1, D2, and D3, and the center image data D2 is the latest. When the subordinate image data is one before the image data, it is processed as shown below.
In step S3, in the example shown in FIG. 6, the gradation value (200) of the latest image data D3 at each pixel position P3, P4 and the gradation value (200) of the previous image data D2 at each pixel position P3, P4. Belong to the same group in the burn-in correction information (group name: 9 in the example shown in FIG. 3), and further, the gradation value (30) of the latest image data D3 at each pixel position P5 to P10 and each pixel position P5 to P10. Since the gradation value (30) of the subordinate image data D2 in the image belongs to the same group (group name: 2 in the example shown in FIG. 3) in the burn-in correction information, the non-change area determination unit 2354 determines each pixel position P3. A region A1 constituted by ~ P10 is determined as a non-change region.
In step S4, in the example shown in FIG. 6, the burn-in area determination unit 2355 increases the count value of the duration of the non-change area A1 determined by the non-change area determination section 2354, and sets each pixel position P3, P4. The continuation period of the non-change area A11 constituted by “2” is set to “2”, and the continuation period of the non-change area A12 constituted by the pixel positions P5 to P10 is set to “1”. The burn-in area determination unit 2355 initializes the count value of the change area A2 configured by the pixel positions P1, P2, and P11 to P16 other than the non-change area A1 to “0”.

After step S4, the burn-in area determination unit 2355 determines whether or not there is an area (pixel position) where the count value of the continuation period is equal to or greater than a predetermined allowable period (step S5).
If the burn-in area determination unit 2355 determines “Y” in step S5, that is, if it is determined that there is an area where the count value of the continuous period is equal to or greater than the predetermined allowable period, the area is set as the burn-in area. Determine (step S6). That is, the above-described processing of steps S4 to S6 corresponds to the burned area determination step according to the present invention.
For example, in the example shown in FIG. 6, when the predetermined allowable period is “2”, as described above, the continuous period of the non-change area A11 formed by the pixel positions P3 and P4 is “2”. Therefore, the printing area determination unit 2355 determines the non-change area A11 formed by the pixel positions P3 and P4 in the latest image data D3 as the printing area.

  After step S <b> 6, the printing correction processing unit 2356 sequentially applies the color tone data included in the latest image data output from the color tone correction processing unit 2353 to the printing area determined by the printing area determination unit 2355. The burn-in correction process is performed by subtracting the offset value (step S7: burn-in correction process step). Then, after the burn-in area determination unit 2355 determines the burn-in area, the burn-in correction processing unit 2356 continuously outputs the latest image data output from the color tone correction processing unit 2353 continuously for a predetermined correction period. The burn-in correction process described above is performed, and processed image data is sequentially output.

Here, when the non-change area determination unit 2354 determines “N” in step S2, that is, when it is determined that there is no pixel position that belongs to the same group based on the burn-in correction information, The burn-in area determination unit 2355 initializes the count values of the durations of all pixel positions (step S8). If the correction period has not elapsed since the printing area was determined by the printing area determination unit 2355 in the previous step S5 (step S9), the printing correction processing unit 2356 is performing the correction period in step S7. Performs the same burn correction processing on the latest image data and sequentially outputs the processed image data.
Similarly, the burn-in correction processing unit 2356 determines that the burn-in area determination unit 2355 determines “N” in step S5, that is, determines that there is no area in which the count value of the continuous period is equal to or greater than the predetermined allowable period. If the correction period has not elapsed since the printing area was determined by the printing area determination unit 2355 in step S5 (step S9), in step S7, the same as the latest image data during the correction period. A burn-in correction process is performed, and processed image data is sequentially output.

After step S7, the PC 2 sequentially transmits processed image data output by the burn-in correction processing unit 2356 to the projector 3 side via the USB cable 4 (step S10).
In step S9, if the correction period has elapsed since the printing area determination unit 2355 determined the printing area in the previous step S5, the printing correction processing unit 2356 performs printing on the latest image data. Without performing the correction process (step S7), the latest image data is sequentially output as processed image data, and the processed image data is transmitted to the projector 3 side via the USB cable 4 in step S10. .

After step S10, the projector 3 receives the processed image data sequentially output via the USB cable 4 (step S11: image information acquisition step).
After step S11, the liquid crystal panel drive control unit 3231 outputs a drive signal based on the processed image data, and applies a voltage based on the color tone data included in the processed image data to the liquid crystal light valve 312 to display the liquid crystal. An optical image based on the processed image data is sequentially formed on the light valve 312 (step S12: image display step).

The first embodiment described above has the following effects.
7 to 9 are diagrams for explaining the effects of the first embodiment. Specifically, FIG. 7 is a graph in which the horizontal axis indicates time and the vertical axis indicates the voltage value applied to the liquid crystal light valve 312. Here, FIG. 7A shows a case where the burn correction processing according to the present invention is not performed, and FIG. 7B shows a case where the burn correction processing according to the present invention is performed. FIG. 8A shows a change in the screen when the burn-in correction process according to the present invention is not performed, and FIG. 8B shows a change in the screen when the burn-in correction process according to the present invention is performed. Show. Here, FIG. 8 shows a screen displayed when burning occurs on the left side, and shows a screen displayed after burning occurs on the right side. In FIG. 8, it is assumed that a black display screen is displayed after burning has occurred. FIG. 9A is a graph showing the relationship between the input color tone and the voltage corresponding to the output color tone in a projector that displays an image by inputting a conventional uncorrected analog signal, and FIG. These are graphs showing the relationship between the input color tone and the voltage corresponding to the output color tone in the projector 3 that displays the image by inputting the corrected digital signal of the present invention.

In the case where the burn-in correction process of the present invention is not performed, when the liquid crystal light valve 312 burns, as shown below, the image quality of the displayed image is deteriorated.
That is, in the case where the liquid crystal light valve 312 is burned, as shown in FIG. 7A, when a predetermined voltage value V1 is applied to the liquid crystal light valve 312 after the time T0 when the baking has occurred, The voltage value V0 to which the voltage value V2 due to the internal electric field is added is applied to the liquid crystal light valve 312. For this reason, as shown in FIG. 8A, even when a black display screen is to be displayed, the previously displayed image F1 remains as an afterimage.

  In contrast, in the present embodiment, the non-change area determination, the burn-in area determination, and the burn-in correction process are performed on the PC 2 side. Here, in the burn-in correction process, the burn-in correction process is performed by subtracting a predetermined offset value from the burn-in area with respect to the color tone data included in the latest image data. For this reason, on the projector 3 side, a voltage based on the color tone data obtained by subtracting the offset value is applied to the printing area in the liquid crystal light valve 312. That is, as shown in FIG. 7A, by subtracting a predetermined offset value from the color tone data, a voltage value V1 that offsets the voltage value V2 due to the internal electric field of the liquid crystal is applied to the liquid crystal light valve 312. It will be. For this reason, as shown in FIG. 8B, even when a black display screen is to be displayed, the previously displayed image F1 does not remain as an afterimage, and the liquid crystal light valve 312 is displayed. It is possible to effectively suppress deterioration in image quality due to generated printing.

Further, in a conventional projector that displays an image by inputting an uncorrected analog signal, as shown in FIG. 9A, the relationship between the input color tone and the voltage corresponding to the output color tone is proportional. Absent. Therefore, a low resolution cannot be used in a region where the voltage corresponding to the input color tone is extremely low or extremely high.
On the other hand, in the projection system 1 according to the present embodiment, the projector 3 acquires processed image data (digital signal) corrected on the PC 2 side via the USB cable 4. There is no need to perform correction, and the input value (color tone) may be used as it is. Further, with the above configuration, the relationship between the input color tone and the voltage corresponding to the output color tone is a proportional relationship as shown in FIG.
Therefore, even if the color tone data included in the processed image data from the PC 2 side is data having a color tone corresponding to a voltage in an extremely low region or a voltage in an extremely high region, the liquid crystal is displayed on the projector 3 side. It becomes possible to forcibly apply the voltage of each region to the light valve 312 and to perform the burn-in correction process over a wider range of colors.

  Then, non-change area determination, burn-in area determination, and burn-in correction processing are performed on the PC 2 side, and the processed image data processed on the PC 2 side is acquired on the projector 3 side, and an image based on the processed image data is acquired. Therefore, it is not necessary to newly provide a burn-in suppression circuit or the like in the hardware configuration of the liquid crystal display device (projector) as in the prior art, while simplifying the configuration of the projector 3 and reducing the manufacturing cost. Therefore, image quality deterioration due to screen burning in the liquid crystal light valve 312 can be effectively suppressed. Further, since the PC 2 originally has a graphic processing function such as a GPU, it is not necessary to provide a new image processing function, and a non-change area determination, a burn-in area determination, In addition, the burn-in correction process can be performed at high speed and with high accuracy.

By the way, as a non-change region determination method, for example, each tone data included in the previous image data and the latest image data is compared for each corresponding pixel, and a change amount of each tone based on each tone data is calculated. A configuration is also conceivable in which an area formed by pixel positions where the change amount is equal to or less than a predetermined threshold is determined as a non-change area. However, in such a configuration, it is necessary to calculate the amount of change in each color tone and compare the amount of change with a predetermined threshold, which increases the processing load and makes it difficult to quickly determine the non-change region.
In the present embodiment, the PC 2 includes a burn-in correction information storage unit 237 that stores burn-in correction information regarding a plurality of groups in which all color tones are divided according to the level of the voltage value applied to the liquid crystal light valve 312. Then, the non-change area determination unit 2354 of the PC 2 compares the color tone data of the previous image data and the subsequent image data for each corresponding pixel, and each color tone based on each color tone data is divided into a plurality of groups based on the burn-in correction information. Of these, an area composed of pixel positions belonging to the same group is determined as a non-change area. As a result, the amount of change in each color tone as described above is calculated and compared with a configuration in which the amount of change is compared with a predetermined threshold to determine the non-change region, thereby reducing the processing load and quickly changing the non-change region. Can be determined.

By the way, screen burning in the liquid crystal light valve 312 is more likely to occur as the voltage value applied to the liquid crystal light valve 312 is higher.
In the present embodiment, the burn-in correction information is information in which all the color tones are classified so that the number of color tones belonging to the group increases as the voltage value applied to the liquid crystal light valve 312 increases. As a result, the non-change area determination unit 2354 determines that the color change belongs to the group of high level (high voltage level to be applied) even if there is some variation, and the non-change area is accurately determined. Can be judged. On the other hand, the non-change area determination unit 2354 avoids unnecessary determination of the non-change area because even a slight change in color tone belonging to a low level (low voltage level to be applied) group is determined as another group. it can. Accordingly, the burn-in area determination unit 2355 and the burn-in correction processing unit 2356 can appropriately perform the burn-in correction process based on the non-change area accurately determined by the non-change area determination unit 2354.

  The PC 2 also stores a shape conversion processing unit 2352 and a color tone correction processing unit 2353, and an image information storage unit that sequentially stores image data subjected to image correction processing by the shape conversion processing unit 2352 and the color tone correction processing unit 2353. 238. Then, the non-change area determination unit 2354 determines the non-change area based on the previous image data stored in the image information storage unit 238 and the latest image data on which the image correction process has been performed. Accordingly, the non-change area determination unit 2354 determines the non-change area after the image correction process is performed on the image data. For example, the non-change area is determined before the image correction process is performed. Compared with the determination configuration, the non-change region can be determined more accurately. Therefore, the burn-in area determination unit 2355 and the burn-in correction processing unit 2356 can more appropriately perform the burn-in correction process based on the non-change area accurately determined by the non-change area determination unit 2354.

[Second Embodiment]
Next, 2nd Embodiment of this invention is described based on drawing.
In the following description, the same parts as those already described are denoted by the same reference numerals and the description thereof is omitted.
In the first embodiment, in the projection system 1, the PC 2 does not change by comparing the latest image data output from the color tone correction processing unit 2353 with the previous image data stored in the image information storage unit 238. An area (burning area) is determined.
On the other hand, in 2nd Embodiment, the projection system 1 is provided with the imaging device 5 which images the projection image on the screen Sc. Then, the PC 2 compares the previous previous image data imaged by the imaging device 5 with the subsequent image data immediately after the previous image data, thereby determining the non-change area (printing area). The present embodiment is mainly different from the first embodiment in that the imaging apparatus 5 is provided and the non-change region determination method is different.

Specifically, FIG. 10 is a block diagram showing a schematic configuration of the projector 3A in the second embodiment.
As shown in FIG. 10, the projector 3 </ b> A as a liquid crystal display device includes an imaging device 5 in addition to the image projection unit 31 and the control device 32 described in the first embodiment.
The imaging device 5 captures a projection image enlarged and projected on the screen Sc under the control of the control device 32. The imaging device 5 is constituted by, for example, a CCD camera including an area sensor using a CCD (Charge Coupled Device) as an imaging device, captures a projection image, and outputs an electrical signal corresponding to the projection image to the control device 32. To do.
And the control part main body 323 of the control apparatus 32 inputs the electric signal output from the imaging device 5, and image data according to the projection image imaged by the imaging device 5 is connected to the PC2 side via the USB cable 4. Sequentially.

In the present embodiment, the image information storage unit 238 configuring the PC 2 sequentially stores image data obtained by capturing an image projected by the image capturing device 5 and transmitted from the projector 3A side via the USB cable 4.
Then, the non-change area determination unit 2354, among the image data stored in the image information storage unit 238, all the previous previous image data and the subsequent image data immediately after the previous image data for each corresponding pixel. The non-change region is determined in the same manner as in the first embodiment. Further, the method for determining the burned area by the burned area determining unit 2355 is the same as in the first embodiment. Further, as in the first embodiment, the burn-in correction processing unit 2356 determines the color tone data included in the latest image data sequentially output from the color tone correction processing unit 2353 by the burn-in area determination unit 2355. The burn correction process is performed on the burned area.

  As for the operation of the projection system 1 in the present embodiment, as described above, the imaging device 5 is provided for the first embodiment, and the non-change region is imaged by the imaging device 5 on the PC 2 side. The only difference is that it is performed based on the image data. That is, the operation is substantially the same as that described in the first embodiment.

The second embodiment described above has the following effects in addition to substantially the same effects as those of the first embodiment.
In the present embodiment, the projection system 1 includes an imaging device 5. Further, the image information storage unit 238 of the PC 2 sequentially stores image data in which a projection image is captured by the imaging device 5 and transmitted from the projector 3 side via the USB cable 4. Then, the non-change area determination unit 2354 determines the non-change area based on the previous image data and the subsequent image data stored in the image information storage unit 238. Thereby, for example, in the projector 3A, predetermined image correction processing (image correction processing other than image correction processing (shape conversion processing and tone correction processing) performed on the PC 2 side) is performed on the processed image data. Even if it is a case, the non-change area | region determination part 2354 picks up the image in which this image correction process was performed with the imaging device 5, and based on the previous image data and subsequent image data which were imaged with the imaging device 5. Since the non-change area is determined, the non-change area can be determined more accurately. Accordingly, the burn-in area determination unit 2355 and the burn-in correction processing unit 2356 can appropriately perform the burn-in correction process based on the non-change area accurately determined by the non-change area determination unit 2354.

[Third embodiment]
Next, 3rd Embodiment of this invention is described based on drawing.
In the following description, the same parts as those already described are denoted by the same reference numerals and the description thereof is omitted.
FIG. 11 is a block diagram showing a schematic configuration of the PC 2B in the third embodiment.
FIG. 12 is a block diagram illustrating a schematic configuration of a projector 3B according to the third embodiment.
In the second embodiment, in the projection system 1, almost all the processes (shape conversion process, color tone correction process, non-change area determination, burn-in area determination, and burn-in correction process) are performed on the PC 2 side. On the projector 3 side, an image based on the processed image data transmitted from the PC 2 side is displayed.
On the other hand, in the third embodiment, a part of the process performed on the PC 2 side described in the second embodiment is omitted, and the projector 3B performs a part of the omitted process. Other configurations are the same as those of the second embodiment.

Specifically, as shown in FIG. 11, the PC 2B as the information processing apparatus has an image correction parameter storage unit 234 and a shape conversion processing unit 2352 compared to the configuration of the PC 2 described in the second embodiment (FIG. 2). The color tone correction processing unit 2353 and the burn-in correction processing unit 2356 are omitted.
Then, the PC 2B transmits image data corresponding to the video source of the auxiliary memory 233 to the projector 3B side via the USB cable 4, and the printing area determination unit 2355 determines the printing area as in the second embodiment. Thereafter, the printing area information relating to the printing area is transmitted to the projector 3B via the USB cable 4.

Further, as shown in FIG. 12, the projector 3B as a liquid crystal display device is configured by including a GPU or the like in the control device 32, compared to the configuration of the projector 3A described in the second embodiment (FIG. 10). An image processing unit 324B is provided.
As shown in FIG. 12, the image processing unit 324B has a shape conversion process having substantially the same functions as the shape conversion processing unit 2352, the color tone correction processing unit 2353, and the burn-in correction processing unit 2356 described in the second embodiment. A unit 3241, a color tone correction processing unit 3242, and a burn-in correction processing unit 3243. The shape conversion processing unit 3241 and the color tone correction processing unit 3242 correspond to the image correction processing unit according to the present invention.
The shape conversion processing unit 3241 and the color tone correction processing unit 3242 acquire the image data transmitted from the PC 2 side, and use the correction parameters stored in the image correction parameter storage unit 322 for the image data. The shape conversion process and the color tone correction process described in the second embodiment are performed. Then, image data (latest image data) that has been subjected to image processing (shape conversion processing and color tone correction processing) is sequentially output to the burn-in correction processing unit 3243.

  The printing correction processing unit 3243 obtains the printing area information transmitted from the PC 2 side (burning area information acquisition step), and recognizes the printing area based on the printing area information. Then, the burn-in correction processing unit 3243 sequentially performs the burn-in correction process on the recognized printing area in the same manner as in the second embodiment, with respect to the color tone data included in the latest image data output from the color tone correction processing unit 3242. (Burn correction processing step). The burn-in correction processing unit 3243 sequentially outputs processed image data obtained by performing the burn-in correction process on the latest image data to the liquid crystal panel drive control unit 3231. Then, the liquid crystal panel drive control unit 3231 outputs a drive signal based on the processed image data, applies a voltage based on the color tone data included in the processed image data to the liquid crystal light valve 312, and the liquid crystal light valve 312. Sequentially form optical images based on the processed image data (image display step).

  As for the operation of the projection system 1 in the present embodiment, as described above, a part of the process performed on the PC 2 side described in the second embodiment is omitted, and a part of the omitted process is replaced by the projector 3B. Therefore, the operation is substantially the same as that described in the second embodiment.

The third embodiment described above has the following effects in addition to substantially the same effects as those of the second embodiment.
In the present embodiment, since the projector 3B includes the image processing unit 324B configured to include a GPU or the like, a part of the processing performed on the PC 2 side described in the second embodiment (shape conversion processing and Color tone correction processing) can be performed by the image processing unit 324B, and the processing load on the PC 2 side can be reduced.
Further, by adding the function of the burn-in correction processing unit 3243 for performing the burn-in correction process to the image processing unit 324B, a burn-in suppression circuit and the like are newly provided in the hardware configuration of the liquid crystal display device (projector) as in the past. This eliminates the need for image quality deterioration due to screen burning in the liquid crystal light valve 312 while simplifying the configuration of the projector 3B and reducing the manufacturing cost. Further, the burn-in correction process can be performed at high speed and with high accuracy by software control of a GPU or the like.

[Fourth embodiment]
Next, 4th Embodiment of this invention is described based on drawing.
In the following description, the same parts as those already described are denoted by the same reference numerals and the description thereof is omitted.
In the first embodiment, when determining the burn-in area, the allowable period compared with the duration of the non-change area is set as a single value.
On the other hand, in the fourth embodiment, the burn-in correction information is information in which each permissible period is individually associated with each group described in the first embodiment. Then, the burn-in area determination unit 2355 recognizes the allowable period based on the above-described burn-in correction information, and determines the burn-in area using the allowable period. That is, the present embodiment is mainly different from the first embodiment in printing correction information and the function (printing area determination method) of the printing area determination unit 2355.

FIG. 13 is a diagram illustrating an example of the burn correction information according to the fourth embodiment.
In the present embodiment, the burn-in correction information storage unit 237 stores the burn-in correction information in which each allowable period (for example, the number of frames) is individually associated with each group, as illustrated in the example of FIG.
More specifically, as shown in the example of FIG. 13, the burn-in correction information in the present embodiment associates a long allowable period with a group to which a gradation having a low voltage value applied to the liquid crystal light valve 312 belongs, and the liquid crystal This is information in which an allowable period of a shorter period is associated with a group to which a gradation having a high voltage value applied to the light valve 312 belongs. That is, as shown in the example of FIG. 13, the allowable period “100” is associated with the group name “0”, which is the group to which the gradation with the low voltage value applied to the liquid crystal light valve 312 belongs, and the group name “1”. Is associated with a permissible period “81”, and the permissible period of association becomes shorter as it goes to the group to which the higher gradation belongs.

  When the non-change area is determined by the non-change area determination section 2354 based on the above-described printing correction information, the burn-in area determination section 2355 uses any of the image data compared by the non-change area determination section 2354. A permissible period associated with a group to which a color tone (for example, tone value) belongs based on the color tone data of the non-change area is recognized. The burn-in area determination unit 2355 compares the determined duration of the non-change area with the recognized allowable period. Then, the burn-in area determination unit 2355 determines an area in which the duration is equal to or longer than the allowable period as a burn-in area.

  Note that the operation of the projection system 1 in the present embodiment is mainly different from the first embodiment in the burning area determination method by the burning area determination unit 2355 as described above. The operation is substantially the same as that described in the embodiment.

The fourth embodiment described above has the following effects in addition to the same effects as those of the first embodiment.
Incidentally, screen burning in the liquid crystal light valve 312 tends to occur as described below.
That is, when the voltage value applied to the liquid crystal light valve 312 is high, baking occurs in a relatively short period. On the other hand, when the voltage value applied to the liquid crystal light valve 312 is low, the image is not burned even when a voltage is applied to the liquid crystal light valve 312 for a long period of time compared to when the voltage value applied to the liquid crystal light valve 312 is high. Hard to occur.
In the present embodiment, the burn-in correction information is information in which each permissible period is individually associated with a plurality of groups, and the period decreases as the voltage value applied to the liquid crystal light valve 312 increases. In this way, each permissible period is information individually associated with each group. Then, the burn-in area determination unit 2355 is associated with a group to which each color tone based on each color tone data corresponding to the non-change area belongs in the duration period and each color tone data included in the previous image data and the latest image data. The burn-in area is determined by comparing the allowable periods. Accordingly, the burn-in area determination unit 2355 can accurately determine the burn-in area in accordance with the occurrence tendency of the screen burn in the liquid crystal light valve 312. Therefore, the burn-in correction processing unit 2356 can appropriately perform the burn-in correction processing based on the burn-in area accurately determined by the burn-in area determination unit 2355.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to the drawings.
In the following description, the same parts as those already described are denoted by the same reference numerals and the description thereof is omitted.
In the first embodiment, when determining the non-change area, the same burn-in correction information is used for all pixel positions.
On the other hand, in the fifth embodiment, when determining the non-change area, printing correction information provided individually for each pixel position is used. That is, this embodiment is mainly different from the first embodiment in that printing correction information is provided for each pixel position and the function (non-change area determination method) of the non-change area determination unit 2354 is different. is there.

14 and 15 are diagrams illustrating an example of a non-change area determination method performed by the non-change area determination unit 2354 according to the fifth embodiment. Specifically, FIG. 14 shows a screen in the liquid crystal light valve 312. FIG. 15 shows printing correction information corresponding to each position in FIG.
A plurality of burn-in correction information is provided for each pixel position of the liquid crystal light valve 312. The plurality of burn-in correction information items are set according to the occurrence tendency of burn-in in the liquid crystal light valve 312.
For example, when the occurrence frequency of printing is high at the pixel position OP (FIG. 14) in the substantially central portion of the liquid crystal light valve 312, and the occurrence frequency of printing is low at the pixel position FP (FIG. 14) in the peripheral portion, FIG. As shown in 15 examples, each printing correction information is set.
That is, as the burn-in correction information corresponding to the pixel position OP (FIG. 15A), all the color tones (256 in FIG. 15) are compared with the burn-in correction information corresponding to the pixel position FP (FIG. 15B). Reduce the number of groups in which (gradation) is divided. Specifically, as shown in the example of FIG. 15, the number of groups based on the burn-in correction information corresponding to the pixel position OP is set to 10, while the number of groups based on the burn-in correction information corresponding to the pixel position FP is set to 15. And
In each burn-in correction information, as in the first embodiment, all color tones are increased as the voltage value applied to the liquid crystal light valve 312 is increased (in the example of FIG. 15, toward the higher gradation). , The number of gradations belonging to the group is increased.

  Then, the non-change area determination unit 2354 uses the burn-in correction information corresponding to the pixel position to compare each tone data included in the latest image data and the previous image data for each corresponding pixel, An area composed of pixel positions in which each color tone based (gradation value in the example of FIG. 15) belongs to the same group among a plurality of groups based on the burn-in correction information is determined as a non-change area.

  Note that the operation of the projection system 1 in the present embodiment is mainly different from the first embodiment in the non-change region determination method by the non-change region determination unit 2354 as described above. The operation is substantially the same as that described in the first embodiment.

The fifth embodiment described above has the following effects in addition to the same effects as those of the first embodiment.
By the way, the burning tendency of the screen in the liquid crystal light valve 312 varies depending on the position (pixel position) in the screen.
In the present embodiment, the printing correction information storage unit 237 stores printing correction information for each pixel position. Thus, the non-change area determination unit 2354 can more accurately determine the non-change area by using the burn-in correction information corresponding to the pixel position. For example, in the example shown in FIG. 17, the non-change area determination unit 2354 has a smaller number of groups than the printing correction information corresponding to the pixel position FP in the printing correction information corresponding to the pixel position OP. Even if there is some variation in color tone at the pixel position OP, it is determined as the same group, and the non-change area can be determined accurately. On the other hand, since the non-change area determination unit 2354 determines a different group even in a slight change in color tone at the pixel position FP, it is possible to avoid unnecessary determination of the non-change area. Accordingly, the burn-in area determination unit 2355 and the burn-in correction processing unit 2356 can appropriately perform the burn-in correction process based on the non-change area determined more accurately.

[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described with reference to the drawings.
In the following description, the same parts as those already described are denoted by the same reference numerals and the description thereof is omitted.
In the first embodiment, the offset value used when performing the burn-in correction process is set as a single value.
On the other hand, in the sixth embodiment, the burn-in correction information is information in which each offset value is individually associated with each group described in the first embodiment. Then, the burn-in correction processing unit 2356 recognizes the offset value based on the above-described burn-in correction information, and performs the burn-in correction process using the offset value. That is, the present embodiment is mainly different from the first embodiment in the burn-in correction information and the function of the burn-in correction processing unit 2356 (burn-in correction processing method).

FIG. 16 is a diagram illustrating an example of printing correction information according to the sixth embodiment.
In the present embodiment, the printing correction information storage unit 237 stores printing correction information in which each offset value is individually associated with each group, as shown in the example of FIG.
More specifically, as shown in the example of FIG. 16, the burn-in correction information in the present embodiment associates a small offset value to a group to which a gradation having a low voltage value applied to the liquid crystal light valve 312 belongs, and the liquid crystal This is information in which a large offset value is associated with a group to which a gradation having a high voltage value applied to the light valve 312 belongs. That is, as shown in the example of FIG. 16, the offset value “1” is associated with the group names “0” and “1” that are groups to which the gradation with a low voltage value applied to the liquid crystal light valve 312 belongs. The name “2” is associated with the offset value “2”, and the associated offset value increases in order toward the group to which the higher gradation belongs.

  When the burn-in correction processing unit 2356 performs the burn-in correction process, the non-change region determination unit 2354 compares the non-change region when the non-change region determination unit 2354 determines the non-change region based on the above-described print correction information. The offset value associated with the group to which the color tone (for example, tone value) based on the color tone data of the burned area in any one of the image data is recognized. Also, the burn-in correction processing unit 2356 sequentially applies the recognized offset to the burn-in area determined by the burn-in area determination unit 2355 with respect to the color tone data included in the latest image data output from the color tone correction processing unit 2353. Burn-in correction processing is performed by subtracting the value.

  Note that the operation of the projection system 1 in the present embodiment is mainly different from the first embodiment in the burning correction processing method by the burning correction processing unit 2356 as described above, and the first embodiment. The operation is substantially the same as that described in.

The sixth embodiment described above has the following effects in addition to the same effects as those of the first embodiment.
Incidentally, screen burning in the liquid crystal light valve 312 tends to occur as described below.
That is, when the voltage value applied to the liquid crystal light valve 312 is high, a strong internal electric field is generated by the liquid crystal. On the other hand, when the voltage value applied to the liquid crystal light valve 312 is low, the generated internal electric field is smaller than when the voltage value applied to the liquid crystal light valve 312 is high.
In the present embodiment, the burn-in correction information is information in which each offset value is individually associated with a plurality of groups, and the value increases as the voltage value applied to the liquid crystal light valve 312 becomes higher. Each offset value is information individually associated with each group. The burn-in correction processing unit 2356 then performs a non-change area determination unit 2354 when a non-change area is determined by the non-change area determination unit 2354 in the print area for the tone data included in the latest image data. The burn-in correction process is performed by subtracting the offset value associated with the group to which the color tone (for example, the gradation value) belongs based on the color tone data of the burn-in area in any of the compared image data. As a result, the burn-in correction processing unit 2356 uses a relatively large offset value when a relatively strong internal electric field is generated in the liquid crystal, and uses a relatively weak internal electric field in the liquid crystal. The burn-in correction process can be performed using a relatively small offset value, and the burn-in correction process can be appropriately performed in accordance with the occurrence tendency of the screen burn in the liquid crystal light valve 312.

[Seventh embodiment]
Next, a seventh embodiment of the present invention will be described with reference to the drawings.
In the following description, the same parts as those already described are denoted by the same reference numerals and the description thereof is omitted.
In the sixth embodiment, the burn-in correction information is information in which a uniform offset value is associated with each group. That is, when the burn-in area is determined by the burn-in area determination unit 2355 and the latest image data is subjected to the burn correction process, the color tone of the burn-in area in the latest image data is uniform regardless of the color tone. The burn-in correction process is performed by subtracting the offset value.
On the other hand, in the seventh embodiment, the burn-in correction information storage unit 237 stores the burn-in correction information (for example, FIG. 3) described in the first embodiment and the inter-group information related to the group based on the burn-in correction information. In contrast, offset value information associated with different offset values is stored. Then, the printing correction processing unit 2356 recognizes the offset value based on the above-described printing correction information and offset value information, and performs the printing correction process on the latest image data using the offset value. That is, the present embodiment is mainly different from the sixth embodiment in that offset value information is provided and the function (burn-in correction processing method) of the burn-in correction processing unit 2356 is different.

FIG. 17 is a diagram illustrating an example of offset value information in the seventh embodiment.
As shown in the example of FIG. 17, the offset value information is between groups based on the burn-in correction information, that is, between groups of a predetermined pre-transition group and a transition destination group (a group lower than the predetermined group). This is information in which each offset value is individually associated with the inter-group information. Although not shown in FIG. 17, a plurality of offset value information is set according to the number of groups based on the burn-in correction information. That is, in the example shown in FIG. 17, each offset with respect to each group information regarding the group between the group name “9” which is a predetermined pre-transition group and the group names “0” to “8” which are transition destination groups. Although only one offset value information in which values are individually associated with each other is illustrated, the predetermined pre-transition group is also used when the predetermined pre-transition group is each group name “0” to “8”. Substantially the same offset value information as in the case of the group name “9” is set.

  More specifically, as shown in the example of FIG. 17, the offset value information associates a large offset value with information between groups having a large difference (width between groups) between a predetermined group before transition and a group after transition. Information having a small offset value associated with the inter-group information having a small range. That is, as shown in the example of FIG. 17, the offset value “35” is associated with the inter-group information of the group name “9” that is the predetermined pre-transition group and the group name “0” that is the transition destination group, An offset value “34” is associated with the inter-group information of the group name “9” that is the predetermined pre-transition group and the group name “1” that is the transition destination group, and the transition destination group to which the higher gradation belongs sequentially. As you go, the associated offset value decreases.

  When the burn-in correction processing unit 2356 performs the burn-in correction process, the color tone (for example, based on the color tone data of the burn-in area in any one of the image data compared by the non-change area determination unit 2354 based on the burn-in correction information described above. , Gradation value) to which the group before transition belongs. Similarly, the printing correction processing unit 2356 has a color tone (for example, a gradation value) based on the color tone data of the printing area in the latest image data output from the color tone correction processing unit 2353 based on the above-described printing correction information. Recognize the transition destination group to which it belongs. Furthermore, the burn-in correction processing unit 2356 recognizes the offset value associated with the inter-group information of the recognized pre-transition group and the transition destination group based on the offset value information described above. Then, the burn-in correction processing unit 2356 sequentially applies the recognized offset to the burn-in area determined by the burn-in area determination unit 2355 with respect to the color tone data included in the latest image data output from the color tone correction processing unit 2353. Burn-in correction processing is performed by subtracting the value.

  Note that the operation of the projection system 1 in this embodiment is mainly different from the first embodiment in the printing correction processing method by the printing correction processing unit 2356 as described above.

The seventh embodiment described above has the following effects in addition to the same effects as those of the first embodiment.
By the way, when image sticking occurs on the screen of the liquid crystal light valve 312, the voltage value (corresponding to the color tone) applied to the liquid crystal light valve 312 at the time of occurrence and the voltage value applied to the liquid crystal light valve 312 after the occurrence ( Depending on the range of change in color tone), the effect of printing recognized by the user differs even if the internal electric field generated in the liquid crystal is the same.
In the present embodiment, the burn-in correction information storage unit 237 stores offset value information in which each offset value is individually associated with inter-group information regarding different groups in addition to the burn-in correction information. Here, the offset value information includes a group having a large difference (difference between levels) between a group having a high voltage value applied to the liquid crystal light valve 312 and a group having a low voltage value applied to the liquid crystal light valve 312. This is information in which a larger offset value is associated with the information. Then, the burn-in correction processing unit 2356 converts the color tone data of the burn-in area in any one of the image data compared with the non-change area determination unit 2354 corresponding to the voltage value applied to the liquid crystal light valve 312 when the burn-in occurred. Recognize the pre-transition group to which the based color tone belongs. Further, the burn-in correction processing unit 2356 recognizes the transition destination group to which the color tone based on the color tone data included in the latest image data and corresponding to the burn-in area corresponding to the voltage value applied to the liquid crystal light valve 312 after the occurrence of the burn-in. . Then, the burn-in correction processing unit 2356 burns the color tone data included in the latest image data by subtracting the offset value associated with the inter-group information of the recognized pre-transition group and the transition-destination group in the burn-in area. Perform correction processing. Accordingly, when the burn-in correction processing unit 2356 has a relatively large change width between the voltage value applied to the liquid crystal light valve 312 at the time of occurrence of printing and the voltage value applied to the liquid crystal light valve 312 after the occurrence of printing. Uses a relatively large offset value, and when the change width is relatively small, the burn-in correction process can be performed using a relatively small offset value, and the burn-in correction process is appropriately performed so that the effect of the burn-in is not recognized by the user. Can be implemented.

[Eighth embodiment]
Next, an eighth embodiment of the present invention will be described with reference to the drawings.
In the following description, the same parts as those already described are denoted by the same reference numerals and the description thereof is omitted.
In the first embodiment, after the burn-in area determination unit 2355 determines the burn-in area, the burn-in correction process unit 2356 continues for a predetermined correction period (for example, a predetermined number of frames), and the color tone correction process unit The same burn correction processing is performed on the latest output image data sequentially from 2353.
On the other hand, in the eighth embodiment, after the burn-in area determination unit 2355 determines the burn-in area, the burn-in correction processing unit 2356 changes the offset value according to the time, and sequentially from the color tone correction processing unit 2353. The burn-in correction process is performed on the latest image data to be output using different offset values. That is, the present embodiment is mainly different from the first embodiment in the function (burn-in correction processing method) of the burn-in correction processing unit 2356.

FIG. 18 is a diagram illustrating an example of the burn correction processing by the burn correction processing unit 2356 according to the eighth embodiment. Specifically, FIG. 18 is a graph in which the horizontal axis indicates time and the vertical axis indicates an offset value. In FIG. 18, it is assumed that the burn-in area is determined by the burn-in area determination unit 2355 when the time is zero.
That is, as shown in the example of FIG. 18, the printing correction processing unit 2356 sets the offset value used when performing the printing correction processing on the latest image data after the printing region determination unit 2355 determines the printing region. Decrease with time. That is, as shown in the example of FIG. 18, the burn correction processing unit 2356 uses the relatively large offset value immediately after the burn area determination unit 2355 determines the burn area, and the burn area determination unit 2355 performs the burn process. As time passes after the region is determined, a lower offset value is used.

  Note that the operation of the projection system 1 in the present embodiment is mainly different from the first embodiment in the burning correction processing method by the burning correction processing unit 2356 as described above, and the first embodiment. The operation is substantially the same as that described in.

The eighth embodiment described above has the following effects in addition to the same effects as those of the first embodiment.
By the way, the strength of the internal electric field generated in the liquid crystal when the liquid crystal light valve 312 is baked on the screen decreases with time.
In the present embodiment, after the burn-in area determination unit 2355 determines the burn-in area, the burn-in correction processing unit 2356 performs the burn-in correction process while gradually reducing the offset value to be used. As a result, the burn-in correction process corresponding to the time change of the internal electric field generated in the liquid crystal can be performed, and the burn-in correction process can be performed more appropriately.

[Ninth Embodiment]
Next, a ninth embodiment of the present invention will be described with reference to the drawings.
In the following description, the same parts as those already described are denoted by the same reference numerals and the description thereof is omitted.
In the first embodiment, the burn-in correction processing unit 2356 performs the burn-in correction process by subtracting a predetermined offset value from the burn-in area with respect to the color tone data included in the latest image data.
On the other hand, in the ninth embodiment, the burn-in correction processing unit 2356 corrects the burn-in correction by changing the color tone based on the color tone data within a predetermined range in the burn-in area with respect to the color tone data included in the latest image data. Processing is performed, and processed image data whose color tone varies within the predetermined range is sequentially output. That is, the present embodiment is mainly different from the first embodiment in the function (burn-in correction processing method) of the burn-in correction processing unit 2356.

For example, the following method can be adopted as the burn-in correction processing method in the present embodiment.
FIG. 19 is a diagram illustrating an example of a printing correction processing method performed by the printing correction processing unit 2356 according to the ninth embodiment.
In the present embodiment, the allowable period compared with the duration of the non-change area when determining the burned area is set shorter than the allowable period described in the first embodiment. In other words, in the first embodiment, the burn-in area determination unit 2355 determines a burn-in area where burn-in has occurred on the screen of the liquid crystal light valve 312 by comparing the duration and the allowable period. On the other hand, in the present embodiment, the burn-in area determination unit 2355 determines a burn-in area where burn-in can occur on the screen of the liquid crystal light valve 312 by comparing the duration period and the allowable period.

Then, the burn-in correction processing unit 2356 sequentially has an area R0 having a low resolution for color expression, as shown in FIG. By changing the color tone within a predetermined range, a burn-in correction process is performed, and processed image data in which the color tone fluctuates within the predetermined range is sequentially output.
Further, among the color tones based on the color tone data of the burned area in the latest image data sequentially output from the color tone correction processing unit 2353, the burn-in correction processing unit 2356, as shown in FIG. For the region R1, a burn-in correction process is performed in which the Cb value and the Cr value in the YCbCr color space are changed within a predetermined range and converted into tone data (RGB values) that keeps the Y value constant. Is processed and the processed image data whose Cb value and Cr value fluctuate within the predetermined range are sequentially output.
On the projector 3 side, the liquid crystal panel drive control unit 3231 outputs a drive signal based on the processed image data, and varies the voltage value applied to the burn-in area where the burn-in can occur on the screen in the liquid crystal light valve 312. Thus, optical images based on the processed image data are sequentially formed.

  Note that the operation of the projection system 1 in this embodiment is mainly different from the first embodiment in the printing correction processing method by the printing correction processing unit 2356 as described above.

The ninth embodiment described above has the following effects in addition to the same effects as those of the first embodiment.
In the present embodiment, the burn-in correction processing unit 2356 sequentially applies color to the burn-in area where the liquid crystal light valve 312 can burn with respect to the color tone data included in the latest image data output from the color tone correction processing unit 2353. Burn-in correction processing is performed by changing the color tone of the region R0 having a low resolution for expression within a predetermined range, and processed image data in which the color tone fluctuates within the predetermined range is sequentially output. For this reason, on the projector 3 side, the voltage value is applied to the printing area where the liquid crystal light valve 312 may be burned while changing the voltage value within a predetermined range. Therefore, it is possible to avoid applying a certain voltage to the burn-in region where the liquid crystal light valve 312 can burn, that is, it is possible to efficiently suppress the occurrence of burn-in on the screen of the liquid crystal light valve 312.

  Further, the burn-in correction processing unit 2356 sequentially resolves the color expression resolution in the burn-in area where the liquid crystal light valve 312 can burn the color tone data included in the latest image data output from the color tone correction processing unit 2353. A burn-in correction process for changing the tone of the halftone region R1 having a high Cb value and Cr value in the YCbCr color space to a tone data (RGB value) that keeps the Y value constant within a predetermined range; The processed image data in which the Y value is constant and the Cb value and the Cr value fluctuate within the predetermined range are sequentially output. For this reason, the image displayed on the projector 3 has a constant Y value with a high human recognition rate in the YCbCr color space, and the Cb and Cr values with a low human recognition rate fluctuate. In the state, the burn-in correction processing unit 2356 can perform the burn-in correction process.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In each of the above embodiments, in the non-change area determination unit 2354 in the non-change area determination, each tone data included in each image data is compared across all the pixels for each corresponding pixel. Alternatively, the comparison may be made not at all pixel positions but only at a plurality of predetermined pixel positions.

  In each of the above embodiments, an embodiment in which the above embodiments are combined can also be adopted. For example, the fourth embodiment to the eighth embodiment may be combined with the second embodiment or the third embodiment, or the ninth embodiment may be combined. It does not matter. Further, the fourth embodiment to the ninth embodiment may be combined as appropriate.

  In the second embodiment and the third embodiment, the imaging device 5 is provided in each of the projectors 3A and 3B. However, the configuration is not limited thereto, and the imaging device 5 may be attached to the PC side.

  In the third embodiment, a part of the process performed on the PC side among the processes of displaying an image by the projector is omitted, and the projector performs a part of the omitted process. Not limited to this, the projector may be configured to perform all processing. That is, in the third embodiment, the projector 3B includes the auxiliary memory 233 of the PC 2B, the burn correction information storage unit 237, the image information storage unit 238, the image generation unit 2351, the non-change area determination unit 2354, and the burn area determination unit 2355. Etc. are added. According to such a configuration, by providing all the processing functions for displaying images in the projector 3B, the projector 3B alone can be stored in the auxiliary memory 233 without connecting the projector 3B via the PC 2B and the USB cable 4 described above. The video source can be displayed and the convenience can be improved.

In each of the above embodiments, the transmissive liquid crystal panel (the liquid crystal light valve 312) is employed. However, the present invention is not limited to this, and a reflective liquid crystal panel may be employed, or a digital micromirror device ( (Trademark of Texas Instruments) may be employed.
In each of the embodiments described above, three liquid crystal light valves 312 are provided. However, the present invention is not limited to this, and only one liquid crystal light valve 312 is provided. Two liquid crystal light valves 312 are provided. The liquid crystal light valve 312 described above may be provided.
In each of the above embodiments, only an example of a front type projector that projects from the direction of observing the screen has been described. However, the present invention also applies to a rear type projector that projects from the side opposite to the direction of observing the screen. Applicable.
In each of the above embodiments, the projector is employed as the liquid crystal display device. However, the present invention is not limited to this, and other liquid crystal display devices may be employed as long as the display device uses a liquid crystal element.

Further, the best configuration for carrying out the present invention has been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.
Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

  Since the present invention can simplify the configuration of the liquid crystal display device and reduce the manufacturing cost, it can be used for an image display system using a projector used for a presentation or home theater.

1 is an external view of a projection system as an image display system in a first embodiment. The block diagram which shows schematic structure of PC in the said embodiment. The figure which shows an example of the sticking correction information in the embodiment. The block diagram which shows schematic structure of the projector in the said embodiment. The flowchart explaining operation | movement of the projection system in the said embodiment. The figure which shows an example of the determination method of the non-change area | region and printing area | region in the said embodiment. The figure for demonstrating the effect of the said embodiment. The figure for demonstrating the effect of the said embodiment. The figure for demonstrating the effect of the said embodiment. The block diagram which shows schematic structure of the projector in 2nd Embodiment. The block diagram which shows schematic structure of PC in 3rd Embodiment. The block diagram which shows schematic structure of the projector in the said embodiment. The figure which shows an example of the sticking correction information in 4th Embodiment. The figure which shows an example of the determination method of the non-change area | region by the non-change area | region determination part in 5th Embodiment. The figure which shows an example of the determination method of the non-change area | region by the non-change area | region determination part in the said embodiment. The figure which shows an example of the sticking correction information in 6th Embodiment. The figure which shows an example of the offset value information in 7th Embodiment. The figure which shows an example of the burning correction process by the burning correction process part in 8th Embodiment. The figure which shows an example of the burning correction process by the burning correction process part in 9th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projection system (image display system), 2, 2B ... PC (information processing apparatus), 3, 3A, 3B ... Projector (liquid crystal display device), 4 ... USB cable (information transmission means) ) 5, imaging device, 237, printing correction information storage unit, 238, image information storage unit, 312, liquid crystal light valve (liquid crystal element), 2352, 3241, shape conversion processing unit (Image correction processing unit), 2353, 3242 ... Color tone correction processing unit (image correction processing unit), 2354 ... Non-change area determination unit, 2355 ... Baking area determination unit, 2356, 3243 ... Baking Correction processing unit, 3231... Liquid crystal panel drive control unit (drive control unit).

Claims (22)

An information processing apparatus that processes image information; a liquid crystal element that changes an alignment state of liquid crystals by applying a voltage and modulates an incident light beam for each pixel according to the alignment state of the liquid crystals; and displays an optical image; A liquid crystal display device having a drive control unit for applying a voltage based on color tone information for each pixel representing a color tone included in the image information based on the image information processed by the information processing device to the liquid crystal element; An image display system comprising an information processing device and an information transmission means for connecting the image display device so that information can be transmitted and received,
The information processing apparatus includes:
The previous image information corresponding to the optical image displayed on the liquid crystal element, and the color tone information included in the subsequent image information immediately after the previous image information, are included in the previous image information and the subsequent image information, respectively. A non-change area determination unit that compares a predetermined plurality of positions in each corresponding image and determines a non-change area as a non-change area, which is configured by a position where a change in each tone information has a predetermined relationship;
The non-change area determination unit continuously compares the continuous period determined to be a non-change area and a predetermined allowable period, and determines an area where the continuous period is equal to or greater than the allowable period on the screen of the liquid crystal element. A burn area determination unit that determines a burn area;
A burn correction processing unit that performs burn correction processing on the burned area determined by the burn area determination unit for the latest latest image information and outputs processed image information;
The drive control unit of the liquid crystal display device acquires the processed image information, applies a predetermined voltage to the liquid crystal element based on the processed image information, and displays an optical image based on the processed image information An image display system characterized by having The image display system according to claim 1,
The information processing apparatus includes:
A printing correction information storage unit that stores printing correction information related to a plurality of groups divided according to the level of a voltage value applied to the liquid crystal element in all colors;
The non-change region determination unit compares each tone information included in the previous image information and the subsequent image information at a predetermined plurality of positions in each image corresponding to the previous image information and the subsequent image information, and An image display system characterized by determining, as a non-change area, an area formed by positions where each color tone based on each color tone information belongs to the same group among the plurality of groups based on the burn-in correction information. The image display system according to claim 2,
The burn-in correction information is information in which each allowable period is individually associated with the plurality of groups,
The burn-in area determination unit corresponds to the non-change area that is included in each of the continuation period determined to be a non-change area by the non-change area determination section and the previous image information and the subsequent image information. Comparing the permissible period associated with the group to which each color tone belongs based on each color tone information to be determined, and determining an area where the duration is equal to or greater than the permissible period as the burn-in area Image display system. In the image display system according to claim 2 or 3,
The image display system, wherein the burn-in correction information storage unit stores the burn-in correction information for each of the predetermined plurality of positions to be compared by the non-change area determination unit. The image display system according to any one of claims 1 to 4,
The burn-in correction processing unit performs the burn-in correction process by subtracting a predetermined offset value in the burn-in area from the color tone information included in the latest image information, and sequentially outputs processed image information. An image display system characterized by that. The image display system according to claim 5,
The information processing apparatus includes:
A printing correction information storage unit that stores printing correction information related to a plurality of groups divided according to the level of a voltage value applied to the liquid crystal element in all colors;
The burn-in correction information is information in which the offset values are individually associated with the plurality of groups,
The burn-in correction processing unit, for color tone information included in the latest image information, is based on each tone information corresponding to the burn-in area, which is included in the burn-in area, the previous image information and the subsequent image information, respectively. An image display system, wherein the burn-in correction process is performed by subtracting the offset value associated with the group to which a color tone belongs, and processed image information is sequentially output. The image display system according to claim 5,
The information processing apparatus includes:
Each offset value is individually associated with the burn-in correction information regarding a plurality of groups in which all color tones are divided according to the level of the voltage value applied to the liquid crystal element, and the inter-group information regarding the different groups. A printing correction information storage unit for storing offset value information;
The burn-in correction processing unit, for color tone information included in the latest image information, is based on each tone information corresponding to the burn-in area included in the burn-in area and the previous image information and the subsequent image information, respectively. The offset associated with the inter-group information regarding the group between the pre-transition group to which the color tone belongs and the transition destination group to which the color tone based on the color tone information corresponding to the burn-in area is included in the latest image information An image display system, wherein the burn-in correction process is performed by subtracting a value and processed image information is sequentially output. The image display system according to any one of claims 5 to 7,
After the burn-in area determination unit determines the burn-in area, the burn-in correction processing unit performs the burn-in correction process on the latest image information by gradually reducing the offset value in time. Image display system characterized by sequentially outputting completed image information. The image display system according to any one of claims 1 to 4,
The burn-in correction processing unit performs the burn-in correction process by changing a color tone based on the color tone information within a predetermined range in the burn-in area with respect to the color tone information included in the latest image information, An image display system characterized by sequentially outputting the processed image information whose color tone varies within the range. The image display system according to claim 9,
The burn-in correction processing unit changes the Cb value and the Cr value within a predetermined range while keeping the Y value in the YCbCr color space constant in the burn-in area with respect to the color tone information included in the latest image information. The burn-in correction process is performed in step S3, and the processed image information in which the Y value in the YCbCr color space is constant and the Cb value and the Cr value vary within the predetermined range is sequentially output. system. The image display system according to any one of claims 1 to 10,
The information processing apparatus includes:
An image correction processing unit that performs a predetermined image correction process on the image information;
An image information storage unit that sequentially stores the image information subjected to the image correction processing in the image correction processing unit,
The non-change area determination unit includes the previous image information corresponding to the optical image displayed on the liquid crystal element among the image information stored in the image information storage unit, and the image correction processing unit performs image correction. Each tone information included in the subsequent image information after the previous image information that has been processed is compared at a plurality of predetermined positions in each image corresponding to the previous image information and the subsequent image information, and An image display system characterized in that an area formed by positions at which changes in color tone information have a predetermined relationship is determined as a non-change area. The image display system according to any one of claims 1 to 10,
An imaging device that captures an image displayed on the liquid crystal display device;
The information processing apparatus includes:
An image information storage unit for sequentially storing image information related to images captured by the imaging device;
The non-change area determination unit is one after the previous image information and the previous image information corresponding to the optical image displayed on the liquid crystal element among the image information stored in the image information storage unit. Each color information included in each subsequent image information is compared at a predetermined plurality of positions in each image corresponding to the previous image information and the subsequent image information, and a change in each color information has a predetermined relationship An image display system characterized by determining an area formed by the non-change area. An information processing apparatus that processes image information; a liquid crystal element that changes an alignment state of liquid crystals by applying a voltage and modulates an incident light beam for each pixel according to the alignment state of the liquid crystals; and displays an optical image; A liquid crystal display device having a drive control unit that applies a voltage based on color tone information for each pixel representing a color tone included in image information to the liquid crystal element, and the information processing device and the image display device are connected so that information can be transmitted and received An image display system comprising information transmission means for performing
The information processing apparatus includes:
The previous image information corresponding to the optical image displayed on the liquid crystal element, and the color tone information included in the subsequent image information immediately after the previous image information, are included in the previous image information and the subsequent image information, respectively. A non-change area determination unit that compares a predetermined plurality of positions in each corresponding image and determines a non-change area as a non-change area, which is configured by a position where a change in each tone information has a predetermined relationship;
The non-change area determination unit continuously compares the continuous period determined to be the non-change area and a predetermined allowable period, and determines an area in which the continuous period is equal to or greater than the allowable period on the screen of the liquid crystal element. A burn area determination unit that determines a burn area and outputs burn area information related to the burn area;
The liquid crystal display device
The burned area information related to the burned area determined by the burned area determining unit is acquired, and the latest image information is subjected to the burn correction process on the burned area based on the burned area information, and the processed image information is obtained. It has a burn-in correction processing unit to output,
The drive control unit applies a predetermined voltage to the liquid crystal element based on the processed image information to display an optical image based on the processed image information. An information processing apparatus that processes image information; a liquid crystal element that changes an alignment state of liquid crystals by applying a voltage and modulates an incident light beam for each pixel according to the alignment state of the liquid crystals; and displays an optical image; A liquid crystal display device having a drive control unit for applying a voltage based on color tone information for each pixel representing a color tone included in the image information based on the image information processed by the information processing device to the liquid crystal element; An image display method using an image display system comprising an information processing device and an information transmission means for connecting the image display device so that information can be transmitted and received,
The information processing apparatus includes:
The previous image information corresponding to the optical image displayed on the liquid crystal element, and the color tone information included in the subsequent image information immediately after the previous image information, are included in the previous image information and the subsequent image information, respectively. A non-change region determination step of comparing, as a non-change region, a region constituted by a position where a change in each color tone information has a predetermined relationship by comparing at a plurality of predetermined positions in each corresponding image;
By comparing the continuation period determined to be the non-change area in the non-change area determination step and a predetermined allowable period, an area where the continuation period is equal to or greater than the allowable period is burned in the screen of the liquid crystal element. A burn-in area determination step for determining as an area;
For the latest latest image information, perform a burn correction process step for performing burn correction processing on the burn area determined in the burn area determination step and outputting processed image information,
The liquid crystal display device
A processed image information acquisition step for acquiring the processed image information;
An image display step of applying a predetermined voltage to the liquid crystal element based on the processed image information to display an optical image based on the processed image information. An information processing apparatus that processes image information; a liquid crystal element that changes an alignment state of liquid crystals by applying a voltage and modulates an incident light beam for each pixel according to the alignment state of the liquid crystals; and displays an optical image; A liquid crystal display device having a drive control unit that applies a voltage based on color tone information for each pixel representing a color tone included in image information to the liquid crystal element, and the information processing device and the image display device are connected so that information can be transmitted and received An image display method using an image display system provided with an information transmission means,
The information processing apparatus converts the color information included in the previous previous image information corresponding to the optical image displayed on the liquid crystal element and the subsequent image information immediately after the previous image information to the previous image information. And a non-change area determination step of determining, as a non-change area, an area formed by a position where a change in each tone information has a predetermined relationship by comparing at a plurality of predetermined positions in each image corresponding to the subsequent image information When,
By comparing the continuation period determined to be the non-change area in the non-change area determination step and a predetermined allowable period, an area where the continuation period is equal to or greater than the allowable period is burned in the screen of the liquid crystal element. Performing a burning area determination step of determining as an area and outputting burning area information relating to the burning area;
The liquid crystal display device
A printing area information obtaining step for obtaining the printing area information;
A burning correction processing step for performing burn-in correction processing on the burning area based on the burning area information and outputting processed image information with respect to the latest latest image information;
An image display step of applying a predetermined voltage to the liquid crystal element based on the processed image information to display an optical image based on the processed image information. A liquid crystal element that changes an alignment state of liquid crystal by applying a voltage and modulates an incident light beam for each pixel according to the alignment state of the liquid crystal to display an optical image, and a pixel that represents a color tone included in image information An information processing apparatus that outputs the image information to a liquid crystal display device having a drive control unit that applies a voltage based on color tone information to the liquid crystal element, and causes the liquid crystal element to display an optical image based on the image information.
The previous image information corresponding to the optical image displayed on the liquid crystal element, and the color tone information included in the subsequent image information immediately after the previous image information, are included in the previous image information and the subsequent image information, respectively. A non-change area determination unit that compares a predetermined plurality of positions in each corresponding image and determines a non-change area as a non-change area, which is configured by a position where a change in each tone information has a predetermined relationship;
The non-change area determination unit continuously compares the continuous period determined to be a non-change area and a predetermined allowable period, and determines an area where the continuous period is equal to or greater than the allowable period on the screen of the liquid crystal element. A burn area determination unit that determines a burn area;
A burn-in correction processing unit that performs a burn-in correction process on the burn-in area determined by the burn-in area determination unit with respect to the latest latest image information and outputs processed image information. Information processing device. A liquid crystal element that changes an alignment state of liquid crystal by applying a voltage and modulates an incident light beam for each pixel according to the alignment state of the liquid crystal to display an optical image, and a pixel that represents a color tone included in image information A control program for an information processing apparatus that outputs the image information to a liquid crystal display device having a drive control unit that applies a voltage based on color tone information to the liquid crystal element, and causes the liquid crystal element to display an optical image based on the image information. There,
In a computer incorporated in the information processing apparatus,
The previous image information corresponding to the optical image displayed on the liquid crystal element, and the color tone information included in the subsequent image information immediately after the previous image information, are included in the previous image information and the subsequent image information, respectively. A non-change region determination step of comparing, as a non-change region, a region constituted by a position where a change in each color tone information has a predetermined relationship by comparing at a plurality of predetermined positions in each corresponding image;
By comparing the continuation period determined to be the non-change area in the non-change area determination step and a predetermined allowable period, an area where the continuation period is equal to or greater than the allowable period is burned in the screen of the liquid crystal element. A burn-in area determination step for determining as an area;
A control program for executing a printing correction process step for performing burn-in correction processing on the printing area determined in the printing area determination step and outputting processed image information with respect to the latest latest image information. .   A recording medium on which a control program according to claim 17 is recorded so as to be readable by a computer. A liquid crystal element that changes an alignment state of liquid crystal by applying a voltage and modulates an incident light beam for each pixel according to the alignment state of the liquid crystal to display an optical image, and a pixel that represents a color tone included in image information A liquid crystal display device having a drive control unit for applying a voltage based on the color tone information to the liquid crystal element,
Burn-in correction that acquires burn-in area information related to a burn-in area of the screen in the liquid crystal element, performs burn-in correction processing on the burn-in area based on the burn-in area information, and outputs processed image information with respect to the latest latest image information With a processing unit,
The drive control unit applies a predetermined voltage to the liquid crystal element based on the processed image information to display an optical image based on the processed image information. The liquid crystal display device according to claim 19,
The previous image information corresponding to the optical image displayed on the liquid crystal element, and the color tone information included in the subsequent image information immediately after the previous image information, are included in the previous image information and the subsequent image information, respectively. A non-change area determination unit that compares a predetermined plurality of positions in each corresponding image and determines a non-change area as a non-change area, which is configured by a position where a change in each tone information has a predetermined relationship;
The non-change area determination unit continuously compares the continuous period determined to be a non-change area and a predetermined allowable period, and determines an area where the continuous period is equal to or greater than the allowable period on the screen of the liquid crystal element. A liquid crystal display device comprising: a printing area determination unit that determines a printing area. A liquid crystal element that changes an alignment state of liquid crystal by applying a voltage and modulates an incident light beam for each pixel according to the alignment state of the liquid crystal to display an optical image, and a pixel that represents a color tone included in image information A control program for a liquid crystal display device having a drive control unit for applying a voltage based on the color tone information to the liquid crystal element,
In a computer incorporated in the liquid crystal display device,
A printing area information obtaining step for obtaining printing area information relating to a printing area of the screen in the liquid crystal element;
A burning correction processing step for performing burn-in correction processing on the burning area based on the burning area information and outputting processed image information with respect to the latest latest image information;
An image display step of applying a predetermined voltage to the liquid crystal element based on the processed image information and causing the liquid crystal element to display an optical image based on the processed image information.   22. A recording medium on which a control program according to claim 21 is recorded so as to be readable by a computer.

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