JP3841104B2 - Signal processing to improve motion blur - Google Patents

Description

  The present invention relates to a signal processing technique for improving blurring of moving images in a storage type display device typified by a liquid crystal display device.

  A liquid crystal display device using a liquid crystal panel has been widely used. This liquid crystal display device is an image display device (hereinafter, referred to as “storage type display device”) in which each pixel is constituted by a storage type display element. The storage-type display device has a low-pass time-frequency characteristic in which a response characteristic at a high frequency of the signal frequency is reduced. For example, when a moving image is displayed on a liquid crystal display device, There is a problem that the image is blurred (hereinafter referred to as “moving image blur” or “moving image blur”) according to the moving speed of the object. In addition, when displaying a moving image on a storage-type display device, there is a problem that blurring of the moving image occurs due to an afterimage on the retina when a human eye observes an object moving on the storage-type display device. is there.

  As a technique for solving this problem, for example, one described in Patent Document 1 below is known.

JP 2002-132220 A

  In the above method, the image data of the original image of each frame sequentially stored in the frame memory is read twice at the double speed of each frame period, thereby generating two video signals of the first field and the second field, respectively. The image corresponding to the original image of each frame is displayed by the display of the image by the video signal of the first field and the display of the image by the video signal of the second field. In the first field, a video signal is generated by replacing the image data of even-numbered horizontal lines among a plurality of horizontal lines with black image data (black image data), and the generated video signal corresponds to the generated first field video signal. Display the image to be played. On the other hand, in the second field, a video signal is generated by replacing the image data of odd-numbered horizontal lines with black image data, and an image corresponding to the generated video signal of the second field is displayed. When attention is paid to a certain horizontal line of the image displayed in this way, at each pixel in the horizontal line, when an image represented by the original image data is displayed in a certain field, a black image is always displayed in the previous field. Will be displayed. Thereby, after resetting each pixel in the horizontal line from the state corresponding to the previously displayed image to the state where the black image is displayed, the next image can be displayed. The influence of the state displayed on the screen can be canceled, and the motion blur can be improved.

  However, in the case of the above method, in each field, half of the horizontal line pixels are black images. Therefore, the luminance of the display image of one frame is theoretically half the luminance of the original image of one frame. It will decay to brightness.

  The present invention has been made to solve the above-described problems in the prior art, and suppresses the moving image blur generated in the storage-type display device such as the above-described liquid crystal display device from being attenuated in the luminance level of the display image. It aims at providing the technology to improve.

In order to achieve at least a part of the above object, an image data processing apparatus of the present invention provides:
An image data processing device for generating drive image data for driving an image display device,
An image memory for sequentially storing input image data of a plurality of input frames;
A writing control unit for controlling writing to the image memory;
A read control unit for controlling reading from the image memory;
A drive image data generation unit for generating the drive image data from read image data sequentially read from the image memory,
The drive image data generation unit generates the drive image data by replacing at least a part of the read image data with mask data,
The pixel value represented by the mask data is determined to be smaller than the pixel value represented by the corresponding read image data according to the pixel value represented by the read image data corresponding to the pixel replaced with the mask data. It is characterized by.

  According to the above image data processing device, moving image blur generated in the image display device can be improved by replacing the read image data with mask data and generating the drive image data. Further, the pixel value represented by the mask data replaced with the read image data is determined to be smaller than the pixel value represented by the corresponding read image data in accordance with the pixel value represented by the read image data corresponding to the replaced pixel. Therefore, attenuation of the luminance level of the image displayed on the image display device can be suppressed.

  In particular, the mask data is calculated by processing the read image data corresponding to the pixel to be replaced with the mask data based on a predetermined parameter determined according to the amount of movement of the entire image represented by the read image data. It is preferable that it is produced | generated by.

  In this way, mask data can be generated according to the amount of motion of the image, so that it is possible to effectively improve moving image blur according to the amount of motion of the image.

  The predetermined parameter is such that the ratio of the mask data to the pixel value of the corresponding read image data is in the range from 0 to 1, and the motion amount increases, and the motion amount decreases. It is preferable that it is set so as to increase as the time goes.

  In this way, mask data can be generated effectively according to the amount of motion of the image.

  Here, when the amount of motion is larger than a predetermined amount, the predetermined parameter is set so that the ratio is 1.

  In this way, when the amount of motion is greater than the predetermined amount, the image can be displayed as a still image instead of a moving image.

  The predetermined amount is preferably a magnitude corresponding to a limit visual angular velocity indicating a speed limit of the follow-up movement of the eyeball.

  In this way, it is possible to easily set the amount of movement for displaying an image as a still image instead of a moving image.

  In the image data processing apparatus, the drive image data generation unit includes the read image data, the mask data, and the mask data for each of m (m is an integer of 1 or more) horizontal lines of an image displayed on the image display device. It is preferable to generate drive image data in which the read image data and the mask data have different arrangement orders from each other.

  According to the above, at the pixel to which the mask data is input, the image represented by the new read image data is displayed after the image represented by the mask data is displayed. For this reason, the influence of the image displayed before the mask data is displayed can be suppressed and the image represented by the new read image data can be displayed, so that the motion blur can be effectively improved. . In particular, it is possible to effectively improve moving image blur for a moving image including vertical movement. In particular, m = 1 is most effective.

  Furthermore, it is preferable that the first drive image data and the second drive image data are alternately generated in units of images displayed on the image display device.

  According to the above, the image represented by the mask data and the image represented by the read image data are alternately displayed at each pixel of the image display device, so that the moving image blur can be further effectively improved. it can.

  Further, in the image data processing device, the image data generation unit includes the read image data and the mask data for each of n (n is an integer of 1 or more) vertical lines of an image displayed on the image display device. It is preferable to generate first and second drive image data in which the read image data and the mask data are arranged in different order from each other.

  Even if drive image data is generated as described above, it is possible to effectively improve moving image blur. In particular, it is possible to effectively improve moving image blur for a moving image including horizontal movement. In particular, n = 1 is most effective.

  Furthermore, it is preferable that the drive image data generation unit alternately generates the first drive image data and the second drive image data in units of images displayed on the image display device.

  According to the above, the image represented by the mask data and the image represented by the read image data are alternately displayed at each pixel of the image display device, so that the moving image blur can be further effectively improved. it can.

  In the image data processing device, the drive image data generation unit may include p pixels (p is an integer of 1 or more) in the horizontal direction and q pixels (q is 1) in the vertical direction of an image displayed on the image display device. Drive image data in which the read image data and the mask data are alternately arranged in the horizontal direction and the vertical direction in block units of the above integer), and the arrangement of the read image data and the mask data It is preferable to generate first and second drive image data having different orders.

  With the above configuration, it is possible to effectively improve moving image blur for a moving image including movement in the vertical direction as well as the horizontal direction. In particular, it is most effective if p = q = 1.

  Furthermore, it is preferable that the drive image data generation unit alternately generates the first drive image data and the second drive image data in units of images displayed on the image display device.

  According to the above, since the image represented by the mask data and the image represented by the read image data are alternately displayed at the pixel to which the mask data of the image display device is input, the moving image blur is more effectively performed. Can be improved.

  Further, in the image data processing device, the drive image data generation unit includes s consecutive pixels for r pixels (r is an integer of 3 or more) arranged in each horizontal line of an image displayed on the image display device. The mask data is arranged in (s is a divisor of r), and the positions of the s pixels with respect to the r pixels are t (t is an integer of 1 or more) for each of the horizontal lines. It is also preferable to generate first to (r / s) drive image data that are alternately shifted positions and have different mask data arrangement positions.

  Even with the above configuration, it is possible to effectively improve moving image blur for a moving image including movement in the vertical direction as well as the horizontal direction.

  Furthermore, it is preferable that the drive image data generation unit sequentially generates the first to (r / s) drive image data in units of images displayed on the image display device.

  According to the above, in each pixel of the image display device, the image represented by the mask data at a rate of once (r / s) times when the first to (r / s) drive image data is generated. Is repeatedly displayed, so that the moving image blur can be improved more effectively.

  Further, in the image data processing device, the drive image data generation unit includes, as the drive image data, first drive image data in which an entire image displayed on the image display device is the read image data; It is also preferable to generate second drive image data in which the entire image displayed on the image display device is the mask data.

  Even if the drive image data is generated as described above, it is possible to effectively improve moving image blur for a moving image including movement in the vertical direction as well as in the horizontal direction.

  In each of the image data processing devices, the read image data is preferably read from the image memory at a rate that is a multiple of a frame rate at which the input image data of the plurality of frames is input.

  In this way, it is possible to effectively generate drive image data while suppressing flicker.

  When generating mask data according to the amount of movement of the entire image, the drive image data generation unit adjusts the amount of light emitted from the image display device by a light control unit that controls the amount of light emitted from the image display device. It is preferable to generate the dimming data according to the amount of movement.

  If it does as mentioned above, attenuation of the luminance level of the display image generated in order to improve animation blur can be controlled effectively.

  Note that an image display system including the image display device can be configured by the image data processing device.

In particular, in the above image display system,
A light control unit for controlling the amount of light emitted from the image display device,
The drive image data generation unit preferably generates dimming data for adjusting the amount of light emitted from the image display device by the dimming unit according to the amount of movement.

  If it does as mentioned above, it can control effectively by adjusting the emitted light quantity of an image display device with respect to attenuation of the luminance level of the display image generated in order to improve animation blur.

The image display device is a non-luminous display device,
The light control unit is
A light source that emits illumination light that illuminates the image display device;
And a control unit that controls the amount of light emitted from the light source according to the light control data.

The light source includes a main light source and a sub light source,
The control unit can also be realized by controlling the amount of light emitted from the sub-light source.

  The present invention is not limited to the above-described aspects of the device invention such as the image data processing apparatus and the image display system, but can also be realized as a method invention such as an image data processing method. Further, there are various aspects such as an aspect as a computer program for constructing a method and an apparatus, an aspect as a recording medium in which such a computer program is recorded, and a data signal embodied in a carrier wave including the computer program. It is also possible to realize in an aspect.

  Further, when the present invention is configured as a computer program or a recording medium that records the program, the entire program for controlling the operation of the apparatus may be configured, or only the portion that performs the functions of the present invention. It may be configured. The recording medium includes a flexible disk, CD-ROM, DVD-ROM / RAM, magneto-optical disk, IC card, ROM cartridge, punch card, printed matter on which a code such as a barcode is printed, an internal storage device of a computer ( A variety of computer-readable media such as a memory such as a RAM and a ROM and an external storage device can be used.

Hereinafter, embodiments of the present invention will be described in the following order based on examples.
A. First embodiment:
A1. Overall configuration of the image display system:
A2. Configuration and operation of drive image data generation unit A3. Effects of the embodiment:
A4. Modified example of driving image data generation operation:
B. Second embodiment:
C. Third embodiment:
D. Variations:

A. First embodiment:
A1. Overall configuration of the image display system:
FIG. 1 is a block diagram showing the configuration of an image display system to which an image data processing apparatus as a first embodiment of the present invention is applied. The image display system DP1 includes a signal conversion unit 10 as an image data processing device, a frame memory 20, a memory write control unit 30, a memory read control unit 40, a drive image data generation unit 50, and a motion amount detection. The computer system includes a unit 60, a liquid crystal panel driving unit 70, a CPU 80, a memory 90, and a liquid crystal panel 100 as a storage type display device. The image display system DP1 includes various peripheral devices such as an external storage device and an interface provided in a general computer system, but illustration thereof is omitted here.

  The image display system DP1 is a projector, which converts illumination light emitted from the light source unit 110 into light (image light) representing an image by the liquid crystal panel 100, and projects the image light using the projection optical system 120. An image is projected on the projection screen SC by forming an image on the screen SC. The liquid crystal panel driving unit 70 can be regarded as a block included in the storage type display device together with the liquid crystal panel 100 instead of the image data processing device.

  The CPU 80 controls the operation of each block by reading and executing the control program and processing conditions stored in the memory 90.

  The signal conversion unit 10 is a processing circuit for converting a video signal input from the outside into a signal that can be processed by the memory write control unit 30. For example, in the case of an analog video signal, it is converted into a digital video signal in synchronization with a synchronization signal included in the video signal.

  The memory write control unit 30 sequentially synchronizes the image data of each frame included in the digital video signal output from the signal conversion unit 10 with the write synchronization signal WSNK corresponding to the video signal. Write to the frame memory 20. The write synchronization signal WSNK includes a write vertical synchronization signal, a write horizontal synchronization signal, and a write clock signal.

  The memory read control unit 40 generates a read synchronization signal RSNK based on the read control condition given from the memory 90 via the CPU 80, and is stored in the frame memory 20 in synchronization with the read synchronization signal RSNK. Read image data. Memory read control unit 40 then outputs read image data signal RVDS and read synchronization signal RSNK to drive image data generation unit 50. Note that the readout synchronization signal RSNK includes a readout vertical synchronization signal, a readout horizontal synchronization signal, and a readout clock signal. The cycle of the read vertical synchronization signal is set to twice the cycle of the write vertical synchronization signal of the video signal written to the frame memory 20 (frame cycle). The stored image data is read twice during one frame period and output to the drive image data generation unit 50.

  The drive image data generation unit 50 is based on the read image data signal RVDS and the read synchronization signal RSNK supplied from the memory read control unit 40 and the motion amount data signal QMDS supplied from the motion amount detection unit 60. A drive image data signal DVDS for driving the liquid crystal panel 100 is generated via the drive unit 70, and the generated drive image data signal DVDS is output to the liquid crystal panel drive unit 70.

  The motion amount detector 60 includes image data of each frame (hereinafter also referred to as “frame image data”) sequentially written in the frame memory 20 and read image data of each frame read from the frame memory 20 (first field described later). And the read image data of the frame corresponding to the second field) are detected, and the motion amount data signal QMDS representing the detected motion amount is output to the drive image data generation unit 50. To do. The detection of the motion amount will be described later.

  The liquid crystal panel drive unit 70 converts the drive image data signal DVDS supplied from the drive image data generation unit 50 into a signal that can be supplied to the liquid crystal panel 100 and supplies the converted signal to the liquid crystal panel 100.

  The liquid crystal panel 100 emits image light representing an image corresponding to the supplied drive image data signal. Thereby, as described above, the image represented by the image light emitted from the liquid crystal panel 100 is projected and displayed on the projection screen SC.

A2. Configuration and operation of drive image data generation unit:
FIG. 2 is a schematic block diagram illustrating an example of the configuration of the drive image data generation unit 50. The drive image data generation unit 50 includes a mask control unit 510, a first latch unit 520, a mask data generation unit 530, a second latch unit 540, and a multiplexer (MPX) 550.

  Mask control unit 510 is based on read vertical synchronization signal VS, read horizontal synchronization signal HS, read clock DCK, and field selection signal FIELD included in read synchronization signal RSNK supplied from memory read control unit 40. A latch signal LTS for controlling the operations of the first latch unit 520 and the second latch unit 540 and a selection control signal MXS for controlling the operation of the multiplexer 550 are output to control generation of the drive image data signal DVDS. The field selection signal FIELD is used to distinguish whether the read image data signal RVDS read from the frame memory 20 at double speed is the read image data signal of the first field or the read image data signal of the second field. Signal.

  The first latch unit 520 sequentially latches the read image data signal RVDS supplied from the memory read control unit 40 in accordance with the latch signal LTS supplied from the mask control unit 510, and the read image data after the latch is read image data. The signal RVDS1 is output to the mask data generation unit 530 and the second latch unit 540.

  Based on the motion amount data signal QMDS supplied from the motion amount detection unit 60 and the read image data signal RVDS1 supplied from the first latch unit 520, the mask data generation unit 530 outputs read image data of each pixel. Mask data representing a pixel value corresponding to the represented pixel value is generated, and the generated mask data is output to the second latch unit 540 as a mask data signal MDS1.

  FIG. 3 is a schematic block diagram illustrating a configuration of the mask data generation unit 530. The mask data generation unit 530 includes a calculation unit 532, a calculation selection unit 534, and a mask parameter reference table 536.

  The calculation selection unit 534 receives a mask data generation condition set in advance and stored in the memory 90 in response to an instruction from the CPU 80, and selects and sets a calculation corresponding to the received mask data generation condition in the calculation unit 532. As the calculation executed by the calculation unit 532, various calculations such as multiplication and bit shift calculation can be used. In this embodiment, multiplication (C = A * B) is performed as the calculation executed by the calculation unit 532. Is selected and set.

  The mask parameter reference table 536 is read by the CPU 80 from the memory 90 and supplied with the table data indicating the relationship between the normalized image motion amount and the corresponding mask parameter value in advance. Is stored. As a result, the mask parameter reference table 536 refers to the table data to determine the value of the mask parameter MP corresponding to the motion amount indicated by the motion amount data signal QMDS supplied from the motion amount detection unit 60, and determines the determined mask. Data indicating the value of the parameter MP is output to the calculation unit 532. In addition, although it demonstrated as table data here, you may be set as the function calculation by the polynomial used as the approximate expression.

  FIG. 4 is an explanatory diagram showing table data stored in the mask parameter reference table 536. As shown in FIG. 4, this table data indicates the characteristics of the value (0 to 1) of the mask parameter MP with respect to the motion amount Vm. The motion amount Vm is represented by the number of pixels that move in units of frames, that is, the moving speed with the unit of [pixel / frame]. It can be considered that the greater the amount of movement Vm, the more intense the movement of the image, and the greater the degree of motion blur. Therefore, the value of the mask parameter MP with respect to the motion amount Vm is set to be smaller as the motion amount Vm is larger in the range of 0 to 1 and larger as the motion amount Vm is smaller.

  The calculation unit 532 in FIG. 3 sets the read image data in the input read image data signal RVDS1 as the calculation parameter A and sets the mask parameter MP supplied from the mask parameter reference table 536 as the calculation parameter B. The selected operation (A? B:? Is an operator indicating the selected operation) is executed. The mask data that is the calculation result C (= A? B) is output as the mask data signal MDS1. Thereby, for each pixel of the image represented by the input read image data RVDS1, mask data corresponding to the amount of movement of the image is generated based on the read image data of each pixel.

  For example, as described above, multiplication (C = A * B) is selected and set as the calculation executed by the calculation unit 532, and “0.3” is set as the value of the mask parameter MP by the mask parameter reference table 536. It is assumed that the calculation parameter B is set. At this time, if the values of the read image data in the read image data signal RVDS1 input as the calculation parameter A are “00h”, “32h”, and “FFh”, the calculation unit 532 has “00h”, Mask data having values of “0Fh” and “4Ch” is output as a mask data signal MDS1. That is, the value of the mask parameter MP indicates the ratio (attenuation ratio) of the mask data to the pixel value of the read image data.

  The motion amount Vm can be easily obtained by the motion amount detection unit 60 using various general motion vector calculation methods. For example, it can be obtained as follows. That is, an image of one frame is divided into a plurality of block groups each having m pixels × n pixels (m and n are integers of 2 or more) as one block, and motion vectors between two frames are respectively obtained for each block. To obtain the amount of movement. Then, the sum of the obtained motion amounts of each block is obtained. The motion vector of one block can be easily obtained by obtaining the amount of movement of the barycentric coordinates of the pixel data (luminance data) included in the block. The sum of the motion amounts of the blocks obtained as described above corresponds to the image motion amount Vm between two frames.

  The second latch unit 540 of FIG. 2 sequentially latches the read image data signal RVDS1 output from the first latch unit 520 and the mask data signal MDS1 output from the mask data generation unit 530 in accordance with the latch signal LTS. The read image data after latching is output to multiplexer 550 as read image data signal RVDS2, and the mask data after latching is output as mask data signal MDS2.

  The multiplexer 550 generates a drive image data signal DVDS by selecting one of the read image data signal RVDS2 and the mask data signal MDS2 according to the selection control signal MXS output from the mask control unit 510, and generates the drive image data signal DVDS. Output to.

  The selection control signal MXS includes a field signal FIELD, a readout vertical synchronization signal VS, a readout horizontal synchronization signal HS, and a readout clock DCK so that a pattern of mask data inserted into the readout image data becomes a predetermined mask pattern. Is generated based on

  FIG. 5 is an explanatory diagram showing generated drive image data. As shown in FIG. 5A, the frame image data of each frame is stored in the frame memory 20 by the memory write control unit 30 (FIG. 1) during a certain period (frame period) Tfr. FIG. 5A shows a case where frame image data FR (N) of N frames (N is an integer of 1 or more) and frame image data FR (N + 1) of (N + 1) frames are stored in the frame memory 20 in order. An example is shown.

  Then, as shown in FIG. 5B, the frame image data stored in the frame memory 20 is converted by the memory read control unit 40 (FIG. 1) at a cycle (field cycle) Tfi that is twice the frame cycle Tfr. The data is read twice and sequentially output as read image data FI1 corresponding to the first field and read image data FI2 corresponding to the second field. FIG. 5B shows read image data FI1 (N) and read image data FI2 (N) in the first field in N frame, and read image data FI1 (N + 1) in the first field in (N + 1) frame. ) And the read image data FI2 (N + 1) in the second field are output as an example.

  Then, as shown in FIG. 5C, in the drive image data generation unit 50, the even-numbered horizontal lines (2, 4, 6, 8,...) Of the read image data FI1 of the first field are mask data. First drive image data replaced with (area indicated by cross hatch) is generated. Further, second drive image data is generated by replacing the odd-numbered horizontal lines (1, 3, 5, 7,...) Of the read image data FI2 in the second field with mask data.

  The odd-numbered horizontal lines in the read image data FI1 in the first field may be replaced with mask data, and the even-numbered horizontal lines in the read image data FI2 in the second field may be replaced with mask data.

  In addition, the image represented by the drive image data shown in FIG. 5 appears to be a discrete image because the image of one frame is an image of 8 horizontal lines and 10 vertical lines for ease of explanation. Since it has hundreds of horizontal and vertical lines, it is hardly noticeable due to the nature of human vision.

  FIG. 6 is a timing chart showing the operation of generating the drive image data signal. In the field signal FIELD (FIG. 6A), the readout vertical synchronization signal VS (FIG. 6B), the readout horizontal synchronization signal HS (FIG. 6C), and the readout clock DCK (FIG. 6D). In synchronization, the read image data signal RVDS (FIG. 6E) is input to the drive image data generation unit 50. During a period in which the field signal FIELD is at a high level (hereinafter referred to as “H”), the image data included in the read image data signal RVDS is the read image data FI1 of the first field, and the field signal FIELD is low ( In the following, the period of time indicated as “L”) is read image data FI2 of the second field. That is, as the read image data signal RVDS of each frame, the read image data FI1 of the first field and the read image data FI2 of the second field are alternately input to the drive image data generation unit 50 in synchronization with the read vertical synchronization signal VS. Is done. In FIG. 6, the read image data FI1 (N−1), the first field and the second field in each frame of the (N−1) frame, the N frame, and the (N + 1) frame (N is an integer of 2 or more), An example is shown in which FI2 (N−1), FI1 (N), FI2 (N), and FI1 (N + 1), FI2 (N + 1) are input to the drive image data generation unit 50 as the read image data signal RVDS. Yes.

  During the period in which the read image data signal of the first field is input (hereinafter referred to as “first field period”), the selection control signal MXS (FIG. 6 (f1)) is the odd-numbered horizontal line (Odd Hline). The horizontal scanning period (read horizontal synchronization signal HS) is set to H level in the odd-numbered cycle (FIG. 6 (c1)) of the readout horizontal synchronization signal HS and the horizontal scanning period (read horizontal synchronization signal HS) corresponding to the even-numbered horizontal line (Even Hline). 2, the multiplexer 550 in FIG. 2 reads the read image in the horizontal scanning period corresponding to the odd-numbered horizontal line as the drive image data signal DVDS (FIG. 6 (g1)). Data is output, and mask data is output in the horizontal scanning period corresponding to the even-numbered horizontal lines.

  On the other hand, during the period in which the read image data signal of the second field is input (hereinafter referred to as “second field period”), the selection control signal MXS (FIG. 6 (f2)) corresponds to the odd-numbered horizontal lines. Horizontal scanning period (L level in the odd-numbered cycle of the readout horizontal synchronization signal HS (FIG. 6 (c2)) and horizontal scanning period corresponding to the even-numbered horizontal line (even-numbered cycle of the readout horizontal synchronization signal HS) 2, the multiplexer 550 in FIG.2 outputs the mask data as the drive image data signal DVDS (FIG. 6 (g2)) in the horizontal scanning period corresponding to the odd-numbered horizontal lines, and The read image data is output in the horizontal scanning period corresponding to the horizontal line.

  As described above, in the drive image data generation unit 50 of the present embodiment, the read image data is replaced with mask data in the horizontal scanning period corresponding to the even-numbered horizontal line of the read image data signal in the first field period. Thus, the first drive image data signal is generated, and the second drive image data signal is generated by replacing the read image data with the mask data in the horizontal scanning period corresponding to the odd-numbered horizontal lines in the second field period. The

A3. Effects of the embodiment:
As described above, in the above-described embodiment, one frame of image data is read as first field and second field image data, and the first field read image data corresponds to even-numbered horizontal lines. The read image data is replaced with mask data to generate first drive image data. For the read image data in the second field, the read image data corresponding to the odd-numbered horizontal lines is replaced with mask data. Drive image data is generated. Accordingly, when attention is paid to one horizontal line, mask data and image data are alternately input to each pixel of the liquid crystal panel at the field period Tfi, so that each pixel corresponds to read image data. Before displaying the image, the image represented by the mask data is displayed once, thereby suppressing the influence of the previously displayed image and displaying the image represented by the new image data. Thereby, moving image blur can be improved as in the conventional case.

  In the case of the conventional example, in order to improve the motion blur, the even-numbered horizontal line is set to black image data (black image data) for the image data of the first field, and the image of the second field is set. Used the odd horizontal lines as black image data. For this reason, the substantial luminance of the displayed image is attenuated to about half of the theoretical luminance of the image of one frame. On the other hand, in the case of the present embodiment, the even-numbered horizontal lines of the image in the first field are not image data to be originally displayed, but are predetermined according to the amount of motion (degree of motion) represented by the image data. The mask data is generated by performing the above arithmetic processing. The odd-numbered horizontal lines of the second field image are also used as mask data generated in the same manner. The mask data to be replaced as the image data of the first field and the image data of the second field is not black image data but image data obtained by performing predetermined arithmetic processing on the corresponding image data according to the amount of motion of the image. Therefore, it is possible to suppress the substantial luminance attenuation of the displayed image.

A4. Modified example of driving image data generation operation:
A4.1. Modification 1:
FIG. 7 is an explanatory diagram showing a first modification of generated drive image data. As in the case of the first embodiment shown in FIG. 5, FIG. 7A shows an example in which frame image data FR (N) of N frames and frame image data FR (N + 1) of (N + 1) frames are sequentially stored in the frame memory. FIG. 7B shows an example in which the read image data FI1 (N) of the first field and the read image data FI2 (N) of the second field in the N frame, and the (N + 1) frame. In the example, read image data FI1 (N + 1) of the first field and read image data FI2 (N + 1) of the second field are sequentially read from the frame memory 20 and output.

  When the liquid crystal panel 100 is driven, in order to prevent deterioration of the liquid crystal, processing for inverting the polarity of a signal applied to each pixel of the liquid crystal panel is usually performed in a vertical synchronization signal period (frame period or field period) . In the case of the first embodiment shown in FIG. 5, the read image data is replaced with mask data for even-numbered horizontal lines in the first field period, and the odd-numbered horizontal lines in the second field period. On the other hand, since the read image data is replaced with mask data, the polarity of the mask data signal given to each corresponding pixel of the liquid crystal panel always becomes the same polarity, which results in DC driving which is not preferable for liquid crystal driving.

  Therefore, as shown in FIG. 7C, as the N-frame drive image data, the first drive image data corresponding to the read image data FI1 (N) in the first field and the read image data FI2 in the second field. After the second drive image data corresponding to (N) is sequentially generated, the drive image data of the next (N + 1) frame is first set as the second field corresponding to the read image data FI2 (N + 1) of the second field. Drive image data may be generated, and then the first drive image data corresponding to the read image data FI1 (N + 1) of the first field may be generated. In this way, AC driving that is good for liquid crystal driving can be performed by alternately inverting the polarity of the signal applied to each corresponding pixel of the liquid crystal panel corresponding to the mask data applied to each pixel on the same horizontal line. .

A4.2. Modification 2:
FIG. 8 is an explanatory diagram showing a second modification of the generated drive image data.

  In the first embodiment, as shown in FIG. 5, one frame of image data is read twice from the frame memory 20 at the double-speed field period Tfi during the frame period Tfr, and one field data is obtained by two field image data. The case of representing frame image data is described as an example. However, the present invention is not limited to this, and driving image data may be generated by reading out one frame of image data at least three times during a frame period, as shown in FIG.

  FIG. 8B shows an example in which the image data stored in the frame memory 20 is read out three times at a field speed of 3 × speed and output in order during each frame period. Of the three frame image data read from the frame memory 20 for the frame image data FR (N) of N frames, the first and third read image data are read image data FI1 (first field). N), and the second image data is read image data FI2 (N) of the second field. Then, as shown in FIG. 8C, for the read image data FI1 (N) of the first field, the read image data of the even-numbered horizontal lines is replaced with mask data (area indicated by cross hatching). Thus, first drive image data is generated. For the read image data FI2 (N) in the second field, the read image data on the odd-numbered horizontal lines is replaced with mask data, and second drive image data is generated.

  As shown in FIG. 8B, the first and third image data out of the three pieces of image data read for the frame image data FR (N + 1) of the (N + 1) frame are the second field. Read image data FI2 (N + 1), and the second image data is read image data FI1 (N + 1) in the first field. Then, as shown in FIG. 8C, for the read image data FI1 (N + 1) of the first field, the read image data of the even-numbered horizontal line is replaced with mask data (area indicated by cross hatching). Thus, first drive image data is generated. For the read image data FI2 (N + 1) in the second field, the read image data on the odd-numbered horizontal lines is replaced with mask data, and second drive image data is generated.

  Here, the first read image data in the frame period of N frames is read image data FI1 (N) in the first field, and the second read image data is read image data FI2 (N) in the second field. Therefore, the frame image FR (N) of N frames is represented by the first and second drive image data corresponding to these two read image data.

  The second read image data in the frame period of (N + 1) frames is read image data FI1 (N + 1) in the first field, and the third read image data is read image data FI2 (N) in the second field. Therefore, the frame image FR (N + 1) of (N + 1) frames is represented by the first and second drive image data corresponding to these two read image data.

  The third read image data in the frame period of N frames is read image data FI1 (N) of the first field, and the first read image data in the frame period of (N + 1) frames is the read image data of the second field. Since the data is FI2 (N + 1), the first and second drive image data corresponding to these two read image data can be used between the N frame and the (N + 1) frame by utilizing human visual properties. One frame image to be effectively interpolated is represented. With this interpolated frame image, it is possible to suppress various image quality degradations such as flicker due to discontinuity of image changes, which are caused by an abrupt image change from N frames to (N + 1) frames.

A4.3. Modification 3:
FIG. 9 is an explanatory diagram showing a third modification of the generated drive image data. As in the case of the first embodiment shown in FIG. 5, FIG. 9A shows an example in which frame image data FR (N) of N frames is stored in the frame memory.

  Then, as shown in FIG. 9 (b), the image data stored in the frame memory 20 is read twice in the double-speed field period Tfi during each frame period Tfr, and corresponds to the first field. The read image data FI1 and the read image data FI2 corresponding to the second field are sequentially output.

  Then, as shown in FIG. 9C, in the drive image data generation unit in the modification, the pixels (2, 4, 6, 8,...) Forming the even-numbered vertical lines of the read image data FI1 of the first field. ..: Even Pixel) is generated by replacing the mask data with the mask data (area indicated by the cross hatch). Also, second drive image data is generated by replacing the pixels (1, 3, 5, 7,...: Odd Pixel) forming the odd-numbered vertical lines of the read image data FI2 of the second field with mask data. Is done.

  The odd-numbered vertical lines of the read image data FI1 in the first field may be replaced with mask data, and the even-numbered vertical lines of the read image data FI2 in the second field may be replaced with mask data.

  The image represented by the image data shown in FIG. 9 also appears to be a discrete image because the image of one frame is an image of 8 horizontal lines and 10 vertical lines for ease of explanation. Because it has hundreds of horizontal and vertical lines, it is hardly noticeable due to the nature of human vision.

  FIG. 10 is a timing chart showing a drive image data signal generation operation as the third modified example. In the field signal FIELD (FIG. 10A), the readout vertical synchronization signal VS (FIG. 10B), the readout horizontal synchronization signal HS (FIG. 10C), and the readout clock DCK (FIG. 10D). In synchronization, the read image data signal RVDS (FIG. 10E) is input to the drive image data generation unit 50. During the period in which the field signal FIELD is at the H level, the image data included in the readout image data signal RVDS is the readout image data FI1 in the first field, and in the period in which the field signal FIELD is at the L level, The read image data FI2. That is, as the read image data signal RVDS of each frame, the read image data FI1 of the first field and the read image data FI2 of the second field are alternately alternately synchronized with the read vertical synchronization signal VS in the drive image data generation unit of the modified example. Is input. FIG. 10 shows read image data FI1 (N−1), the first field and the second field in each frame of (N−1) frame, N frame, and (N + 1) frame (N is an integer of 2 or more). An example in which FI2 (N-1), FI1 (N), FI2 (N), and FI1 (N + 1), FI2 (N + 1) are input to the drive image data generation unit in the modification as read image data signals RVDS. It is shown.

  In the first field period, the readout horizontal synchronization signal HS (from the beginning of the horizontal scanning period in which the readout horizontal synchronization signal HS changes to H level in each cycle of FIG. 10 (c1), the readout clock DCK (FIG. 10 (d1)). The selection control signal MXS (FIG. 10 (f1)) alternately changes between the H level and the L level, specifically, in the clock cycle corresponding to the odd-numbered pixel (Odd Pixel), 2 and becomes the L level in the clock cycle corresponding to the even-numbered pixels (Even Pixel), so that the multiplexer 550 in Fig. 2 displays the odd-numbered pixels as the drive image data signal DVDS (Fig. 10 (g1)). The read image data can be output in the clock cycle, and the mask data can be output in the clock cycle of the even-numbered pixels.

  On the other hand, in the second field period, the readout clock DCK (FIG. 10 (d2) from the beginning of the horizontal scanning period in which the readout horizontal synchronization signal HS changes to H level in each cycle of the readout horizontal synchronization signal HS (FIG. 10 (c2)). )), The selection control signal MXS (FIG. 10 (f2)) alternately changes between the L level and the H level, specifically, the clock cycle corresponding to the odd-numbered pixel (Odd Pixel). 2 becomes the L level, and becomes the H level in the clock cycle corresponding to the even-numbered pixels (Even Pixel), so that the multiplexer 550 in FIG 2 performs the odd-numbered operation as the drive image data signal DVDS (FIG. 10 (g2)). The mask data can be output in the clock cycle of each pixel, and the read image data can be output in the clock cycle of even-numbered pixels. .

  As described above, in the case of this modification, the drive image data generation unit replaces the read image data corresponding to the even-numbered pixels in the image data of each horizontal line of the first field with the mask data, and the second data. Of the image data of each horizontal line in the field, read image data corresponding to odd-numbered pixels is replaced with mask data. As a result, for the read image data in the first field, the read image data corresponding to the odd-numbered vertical lines is replaced with the mask data to generate the first drive image data, and the read image data in the second field. On the other hand, the read image data corresponding to the even-numbered vertical lines is replaced with the mask data to generate the second drive image data. Accordingly, when attention is paid to one vertical line, mask data and image data are alternately input to the liquid crystal panel in a field cycle, so that each pixel displays an image corresponding to the read image data. By previously displaying the image represented by the mask data, it is possible to display the image represented by the new image data while suppressing the influence of the previously displayed image. Can be improved.

  In particular, when the image data is replaced with mask data for reading out pixels forming a vertical line as in this modification, the read image data for the horizontal line is replaced with mask data as in the first embodiment. Compared with the moving image including the movement in the horizontal direction, the motion blur can be improved more effectively. However, the first embodiment is more effective than the present embodiment in improving the motion blur for moving images including vertical movement.

  Further, as described in the first embodiment, also in this modification, not black image data but image data obtained by performing predetermined arithmetic processing on corresponding image data according to the amount of image motion is used as mask data. Since it is used, it is possible to suppress the substantial luminance attenuation of the displayed image.

  In addition, in this modification, it is also possible to apply combining the said 1st modification and the 2nd modification.

A4.4. Modification 4:
FIG. 11 is an explanatory diagram showing a fourth modification of the generated drive image data. As in the case of the first embodiment shown in FIG. 6, each frame image data is stored in the frame memory 20 at a frame period. FIG. 11A shows an example in which frame image data FR (N) of N frames is stored in the frame memory.

  Then, as shown in FIG. 11 (b), the image data stored in the frame memory 20 is read twice in the double-speed field period Tfi during each frame period Tfr to correspond to the first field. The read image data FI1 and the read image data FI2 corresponding to the second field are sequentially output.

  Then, as shown in FIG. 11C, in the drive image data generation unit in the modified example, the odd-numbered horizontal lines (1, 3, 5, 7,...) Of the read image data FI1 in the first field. The pixels (2, 4, 6, 8,...) That form the even-numbered vertical lines are replaced with mask data (regions indicated by cross hatching) and the even-numbered horizontal lines (2, 4, 6, 8). ,...) Is generated by replacing the pixels (1, 3, 5, 7,...) Forming the odd-numbered vertical lines with mask data. That is, drive image data having mask data in a checker flag shape is generated. Further, pixels (1, 3, 5, 7,...) Forming odd-numbered vertical lines in the odd-numbered horizontal lines (1, 3, 5, 7,...) Of the read image data FI2 of the second field. .) Is replaced with mask data, and pixels (2, 4, 6, 8,...) Forming even-numbered vertical lines in even-numbered horizontal lines (2, 4, 6, 8,...). Second drive image data in which is replaced with mask data is generated. That is, drive image data having mask data in the form of a checker flag is generated at a pixel different from the position of the mask data in the first field. Also, (1) polarity is applied to FI1 (N) and FI2 (N) in FIG. 11B, and (−) polarity is applied to the next FI1 (N + 1) and FI2 (N + 1). AC drive can also be realized.

  Note that the odd-numbered pixels of the odd-numbered horizontal lines and the even-numbered pixels of the even-numbered horizontal lines of the read image data FI1 of the first field are replaced with mask data, and the odd-numbered pixels of the read image data FI2 of the second field are replaced. The even-numbered pixels of the horizontal lines and the odd-numbered horizontal lines of the even-numbered horizontal lines may be replaced with mask data.

  In addition, the image represented by the image data shown in FIG. 11 also appears to be a discrete image because the image of one frame is an image of 8 horizontal lines and 10 vertical lines for ease of explanation. Because it has hundreds of horizontal and vertical lines, it is hardly noticeable due to the nature of human vision.

  As described above, in the case of this modification, for the image data of the first field, the pixels forming the even-numbered vertical lines in the odd-numbered horizontal lines and the odd-numbered vertical lines in the even-numbered horizontal lines are changed. The read image data corresponding to the pixel to be formed is replaced with mask data, and for the image data in the second field, the pixels forming the odd-numbered vertical lines in the odd-numbered horizontal lines and the even-numbered horizontal lines. The read image data corresponding to the pixels forming the vertical line is replaced with mask data. Accordingly, when attention is paid to a certain pixel, mask data and image data are alternately input to the liquid crystal panel in a field cycle. Therefore, before each pixel displays an image corresponding to new image data. In addition, once the image represented by the mask data is displayed, it is possible to suppress the influence of the previously displayed image and display the image represented by the new image data. Can be improved.

  In particular, when the mask data is in the form of a checkered flag as in the present modification, the effect of improving the motion blur for moving images including vertical movement as in the first embodiment, and the third modification As described above, it is possible to obtain both the effect of improving the motion blur on the moving image including the movement in the horizontal direction. Further, when the mask data is in the form of a checker flag as in the present modification, the pattern in which the mask data is displayed is finer than the horizontal lines in the first embodiment and the vertical lines in the third modification. Therefore, the afterimage phenomenon that occurs on the retina can be reduced, and moving image blur can be further improved.

  Further, as described in the first embodiment, also in this modification, not black image data but image data obtained by performing predetermined arithmetic processing on corresponding image data according to the amount of image motion is used as mask data. Since it is used, it is possible to suppress the substantial luminance attenuation of the displayed image.

  In this modification, the first modification and the second modification can be applied in combination.

A4.5. Modification 5:
FIG. 12 is an explanatory diagram showing a fifth modification of the generated drive image data. As in the case of the first embodiment shown in FIG. 6, each frame image data is stored in the frame memory 20 at a frame period. FIG. 12A shows an example in which frame image data FR (N) of N frames is stored in the frame memory.

  Then, as shown in FIG. 12B, the image data stored in the frame memory 20 is read out twice in the double-speed field period Tfi during each frame period Tfr, and corresponds to the first field. The read image data FI1 and the read image data FI2 corresponding to the second field are sequentially output.

  Then, as shown in FIG. 12C, in the drive image data generation unit in the modification, the odd-numbered horizontal lines (1, 3, 5, 7) of the read image data FI1 (N) of the first field in the N frame. ,...), The pixels (1, 4, 7, 10,...) Forming the (3l + 1) th (l is an integer greater than or equal to 0) vertical line are used as mask data (area indicated by cross hatching). The pixel (2, 5, 8, 11,...) Forming the (3l + 2) th vertical line in the even-numbered horizontal line (2, 4, 6, 8,...) Is used as mask data. The replaced first drive image data is generated.

  Also, the pixels (2, 5, 8) forming the (3l + 2) th vertical line in the odd-numbered horizontal lines (1, 3, 5, 7,...) Of the read image data FI2 (N) in the second field. , 11,... Are replaced with mask data, and the pixels (3, 6, 9) forming the (3l) -th vertical line in the even-numbered horizontal lines (2, 4, 6, 8,...). , 12,...) Is replaced with mask data to generate second drive image data.

  Further, pixels (3l) -th vertical lines in the odd-numbered horizontal lines (1, 3, 5, 7,...) Of the read image data FI1 (N + 1) in the first field of the (N + 1) frame ( (3, 6, 9, 12,...) Are replaced with mask data, and pixels (3l + 1) th vertical lines of even-numbered horizontal lines (2, 4, 6, 8,...) Third drive image data is generated by replacing (1, 4, 7, 10,...) With mask data.

  Then, for the read image data FI2 (N + 1) in the second field of the (N + 1) frame, the (3l + 1) th vertical in the odd-numbered horizontal line (1, 3, 5, 7,...) Again. The pixels (1, 4, 7, 10,...) Forming the line are replaced with mask data, and the (3l + 2) th vertical in the even-numbered horizontal line (2, 4, 6, 8,...) First drive image data is generated by replacing the pixels (2, 5, 8, 11,...) Forming the line with mask data.

  The order of generation of the first to third drive image data is an example, and is not particularly limited. Various orders such as first, third, second, second, first, third, etc. They may be generated in this order.

  The image represented by the image data shown in FIG. 12 also appears as a discrete image because the image of one frame is an image of 8 horizontal lines and 10 vertical lines for ease of explanation, but the actual image is Because it has hundreds of horizontal and vertical lines, it is hardly noticeable due to the nature of human vision.

  As described above, in the case of this modification, when attention is paid to each pixel, mask data is input at a rate of 1 field per 3 fields. Accordingly, the influence of the image displayed before the image represented by the read image data after the mask data is input can be suppressed, so that the moving image blur can be improved.

  In particular, in the case of this modification, although the effect of improving the motion blur is reduced as compared with the case where the checker flag is provided as mask data as in the fourth modification, the movement in the vertical direction is performed as in the first embodiment. It is possible to obtain both the effect of improving moving image blur for a moving image including it and the effect of improving moving image blur for a moving image including movement in the horizontal direction as in the third modification.

  Further, as described in the first embodiment, also in this modification, not black image data but image data obtained by performing predetermined arithmetic processing on corresponding image data according to the amount of image motion is used as mask data. Since it is used, it is possible to suppress the substantial luminance attenuation of the displayed image. In particular, in this modification, read image data is used as mask data at a ratio of one pixel to three pixels, so that the displayed image is substantially compared with the first embodiment and the first to fourth modifications. The effect of suppressing the attenuation of brightness is high.

A4.6. Modification 6:
FIG. 13 is an explanatory diagram showing a sixth modification of the generated drive image data. As in the case of the first embodiment shown in FIG. 6, each frame image data is stored in the frame memory 20 at a frame period. FIG. 13A shows an example in which frame image data FR (N) of N frames is stored in the frame memory.

  Although not shown in the figure, the image data stored in the frame memory 20 is read twice in the field period of double speed during each frame period, and the read image data corresponding to the first field is read out. The read image data FI2 corresponding to FI1 and the second field are sequentially output.

  Then, as shown in FIG. 13B, in the drive image data generation unit in the modification, the mask data is not replaced with the read image data FI1 in the first field, and the read image data in the second field is not replaced. Mask data is replaced for all the pixels of FI2.

  As described above, in the case of this modification, the mask data is not replaced for the image data of the first field, and all the pixels of the image data of the second field are replaced with the mask data of the read image data. Replacement is performed. When attention is paid to each pixel, mask data and image data are alternately input to the liquid crystal panel in a field cycle. Therefore, before each pixel displays an image corresponding to new image data, Once the image represented by the mask data is displayed, it is possible to display the image represented by the new image data by suppressing the influence of the image displayed before that, and to improve the motion blur as before can do.

  Further, as described in the first embodiment, also in this modification, not black image data but image data obtained by performing predetermined arithmetic processing on corresponding image data according to the amount of image motion is used as mask data. Since it is used, it is possible to suppress the substantial luminance attenuation of the displayed image.

  In this modification, the first modification and the second modification can be applied in combination.

A4.7. Modification 7:
In the drive image data of the above embodiment, the case where the read image data and the mask data are alternately arranged for each horizontal line is shown as an example, but m (m is an integer of 1 or more) horizontal. The read image data and the mask data may be alternately arranged for each line.

  In the driving image data of the third modification, the read image data and the mask data are alternately arranged for each vertical line, but n (n is an integer of 1 or more). The read image data and the mask data may be alternately arranged for each vertical line.

  Furthermore, in the driving image data of the modification example 4, the case where the readout image data and the mask data are alternately arranged in the horizontal direction and the vertical direction is shown as an example for each pixel. Read image data and mask data are alternately arranged in the horizontal direction and the vertical direction in units of blocks of pixels (p is an integer of 1 or more) and q pixels (q is an integer of 1 or more) in the vertical direction. Also good.

  In the driving image data of the modified example 5, mask data is arranged in one pixel for every three pixels arranged in the horizontal line, and the mask data and the read image data are alternated for each horizontal line. In this example, the mask data is stored in s pixels (s is a divisor of r) that is continuous for r pixels (r is an integer of 3 or more) arranged in each horizontal line. In addition, the positions of the s pixels with respect to the r pixels may be alternately shifted every t (t is an integer of 1 or more) the horizontal lines.

B. Second embodiment:
FIG. 14 is a block diagram showing a configuration of an image display system to which the image data processing apparatus as the second embodiment is applied. The image display system DP2 includes a dimming light source unit 110F in place of the light source unit 110 of the image display system DP1 (FIG. 1) of the first embodiment, and further, a dimming light source in place of the drive image data generation unit 50. The image display system DP1 is the same as the image display system DP1 of the first embodiment, except that a drive image data generation unit 50F capable of outputting dimming data for controlling the operation of the unit 110F is provided. Therefore, only the differences will be described below.

  FIG. 15 is a schematic block diagram illustrating a configuration of the drive image data generation unit 50F. In the drive image data generation unit 50F, the mask data generation unit 530 (FIG. 2) of the drive image data generation unit 50 of the first embodiment outputs dimming data QLDS for controlling the operation of the dimming light source unit 110F. This is the same except that it is replaced by a mask data generation unit 530F capable of performing the above.

  FIG. 16 is a schematic block diagram illustrating a configuration of the mask data generation unit 530F. The configuration of the mask data generation unit 530F is the same as that of the mask data generation unit 530 (FIG. 3) of the first embodiment, except that a dimming parameter reference table 538 is provided.

  In the dimming parameter reference table 538, table data indicating the relationship between the amount of motion of the image and the value of the dimming parameter corresponding thereto is read out from the memory 90 in advance by the CPU 80 and stored. Yes. As a result, the dimming parameter reference table 538 refers to this table data in the same manner as the mask parameter reference table 536, and adjusts the dimming parameter reference table 538 according to the motion amount indicated by the motion amount data signal QMDS supplied from the motion amount detection unit 60. The value of the optical parameter KL is obtained and output to the dimming light source unit 110F as the dimming data signal QLDS.

  FIG. 17 is an explanatory diagram showing table data stored in the dimming parameter reference table 538. FIG. 17A shows the characteristics of the table data stored in the mask parameter reference table 536, that is, the characteristics of the value (0 to 1) of the mask parameter MP with respect to the motion amount Vm. FIG. 17B shows the characteristics of the table data stored in the dimming parameter reference table 538, that is, the same value as the table data of the mask parameter reference table 536, that is, the dimming parameter KL value (1 ˜0). It can be considered that as the amount of movement Vm is larger, the motion of the image becomes more intense and the degree of motion blur increases. Therefore, as shown in FIG. 17A, the mask parameter MP value in the mask parameter reference table 536 becomes smaller as the motion amount Vm increases in the range of 0 to 1, and the motion amount Vm decreases. It is set to become larger. Accordingly, the larger the motion amount Vm, the smaller the value of the mask parameter MP, the smaller the value of the generated mask data, and the luminance of the displayed image is attenuated with respect to the theoretical luminance. On the other hand, as shown in FIG. 17B, the characteristics of the table data of the dimming parameter reference table 538 have a dimming parameter KL value in the range of 1 to 0, contrary to the mask parameter MP. It is set so that it increases as the amount of movement Vm increases and decreases as the amount of movement Vm decreases. In the dimming light source unit 110, the luminance EL of the light source unit is determined according to the following equation in accordance with the dimming parameter KL supplied as the dimming data QLDS.

EL = EA + EB × KL (1)
ELmax = EA + EB (2)
Here, ELmax indicates the maximum luminance that can be output by the dimming light source unit 110F, EA indicates a reference luminance component as a fixed component that is output regardless of the value of the dimming parameter KL among the maximum luminance ELmax, and EB Indicates a dimming luminance component as an adjustment component adjusted according to the value of the dimming parameter KL.

  According to the above configuration, the luminance EL of the light source unit when there is no movement is the reference luminance EA, whereas the luminance EL of the light source unit when there is movement is the dimming parameter KL that increases according to the amount of movement. Accordingly, the height can be increased by (EB × KL). This makes it possible to compensate for the attenuation of the luminance component of the image that occurs according to the amount of motion described above.

  Note that the configuration of the dimming light source unit 110F is a reference luminance component EA as a fixed component that is output regardless of the value of the dimming parameter KL, out of the luminance that can be output from one light source lamp, and the remaining luminance Although the case where the luminance component EB is used as the adjustment luminance component has been described as an example, the present invention is not limited to this. For example, a main light source that outputs a reference luminance component EA as a fixed component and an auxiliary light source that outputs a dimming luminance component EB are provided, and the luminance of the auxiliary light source is adjusted according to the value of the dimming parameter KL. It may be.

In the present embodiment, the description of the drive image data generated by the drive image data generation unit 50F is omitted , but any of the drive image data described in the first embodiment and the modification of the first embodiment It is also possible to do.

C. Third embodiment:
FIG. 18 is a block diagram showing a configuration of an image display system to which the image data processing apparatus as the third embodiment is applied. The image display system DP3 omits the motion amount detection unit 60 of the image display system DP1 (FIG. 1) of the first embodiment, and replaces the drive image data generation unit 50 with the drive image data generation unit 50G accordingly. Except for these points, the image display system DP1 is the same as that of the first embodiment. Therefore, only the differences will be described below.

  FIG. 19 is a schematic block diagram illustrating a configuration of the drive image data generation unit 50G. In the drive image data generation unit 50G, the mask data generation unit 530 of the drive image data generation unit 50 (FIG. 2) of the first embodiment is replaced with a mask data generation unit 530G to which the motion amount data signal QMDS is not input. It is the same except for the point.

  FIG. 20 is a schematic block diagram illustrating a configuration of the mask data generation unit 530G. The configuration of the mask data generation unit 530G is the same as that of the first embodiment except that a mask parameter storage unit 536G is provided instead of the mask parameter reference table 536 in the mask data generation unit 530 (FIG. 3) of the first embodiment. This is the same as the mask data generation unit 530 in the example.

  Table data is set by the CPU 80 in the mask parameter reference table 536 of the mask data generation unit 530 of the first embodiment. In the mask parameter reference table 536, the value of the mask parameter MP is obtained by referring to this table data. On the other hand, the value of the mask parameter MP is directly set from the CPU 80 in the mask parameter storage unit 536G of the mask data generation unit 530G. For example, table data indicating the relationship between the image motion amount Vm and the mask parameter MP is stored in the memory 90. When the user specifies a desired motion amount, the table data is referred to by the CPU 80. The value of the corresponding mask parameter MP is obtained, and the obtained value of the mask parameter MP is set in the mask parameter storage unit 536G.

  For example, the motion amount of the image can be designated by any method as long as the user can designate a desired motion amount, such as the motion amount (large), (medium), and (small) in the motion priority mode. It does not matter. At this time, the table data may be associated with the values of the mask parameters MP corresponding to these movement amounts.

  Also in this embodiment, moving image blur can be improved as in the case of the first embodiment. Further, it is possible to suppress a substantial luminance attenuation of the displayed image.

In the present embodiment, the description of the drive image data generated by the drive image data generation unit 50G is omitted , but any of the drive image data described in the first embodiment can be used. Further, as described in the second embodiment, it is possible to provide a dimming light source unit and adjust the luminance by the dimming light source unit according to the amount of movement.

D. Variations:
In addition, this invention is not restricted to said Example and embodiment, In the range which does not deviate from the summary, it is possible to implement in various aspects.

D1. Modification 1:
FIG. 21 is an explanatory diagram illustrating a modification of the characteristics of the mask parameter MP with respect to the motion amount Vm represented by the table data.

  In the above embodiment, as shown in FIG. 4, the table data has a mask parameter MP value corresponding to the motion amount Vm in the range of 0 to 1, and the smaller the motion amount Vm, the smaller the motion data Vm. Thus, it is set to be 1 when the motion amount Vm is equal to or less than a predetermined amount, and 0 when the motion amount Vm is equal to or greater than the predetermined amount.

  Here, the following movement of the eyeball for the viewer of the image to perceive the moving image is defined by a visual angular velocity (unit: [degree / second]). Further, it is said that the maximum speed (limit visual angular velocity) θmax of tracking the eyeball in a short time is 30 [degree / second], and it is considered difficult to recognize a moving image at or above the limit visual angular velocity. .

  Therefore, as shown in FIG. 21, when the motion amount Vm is equal to or larger than the amount Vmmax corresponding to the limit visual angular velocity, it is assumed that the video scene is changed instead of the moving image, and is treated in the same manner as the still image. The mask parameter MP may be set to 1.

In addition, when the limiting visual angular velocity θmax is converted into the motion amount Vmmax [pixel / frame], it is expressed by the following equation.
fv · Vmmax · (W / Xn) = 2 · 3H · tan (θmax / 2)
Vmmax = 2 · (1 / fv) · (3H / W) · Xn · tan (θmax / 2) (1)
fv is the frame frequency, H is the vertical length of the display image, W is the horizontal length of the display image, and Xn is the horizontal resolution. 3H indicates a viewing distance defined in “HDTV standard viewing conditions” by the Institute of Image Information and Television Engineers.

D2. Modification 2:
In the first embodiment and the first to fifth modifications, the frame image data sequentially written in the frame memory is read at a speed of at least double speed, and each frame image data is converted into a plurality of fields of read image data. Although the case of conversion is described as an example, the frame image data sequentially written in the frame memory is read at the same speed, and the odd-numbered frame image data of the read image data sequentially read out is converted into the first embodiment or the first example. The read image data of the first field in the modified examples to the fifth modified example, and the even-numbered frame image data is the read image data of the second field in the first example and the first to fifth modified examples. Alternatively, the driving image data signal may be generated by inserting corresponding mask data.

D3. Modification 3:
In the above embodiment, a projector using a liquid crystal panel is described as an example. However, the present invention can be applied to a direct-view display device instead of the projector. In addition to the liquid crystal panel, various storage type display devices such as PDP (Plasma Display Panel) and ELD (Electro Luminescence Display) can be applied. When a self-luminous display device such as a PDP is applied, when adjusting the luminance according to the amount of image movement as in the second embodiment, the light emission control for controlling the light emission luminance of the display device itself. A unit may be provided to adjust the light emission luminance.

D4. Modification 4:
In the drive image data generation unit 50 of the first and second embodiments and the drive image data generation unit 50G of the third embodiment, the read image data signal RVDS read from the frame memory 20 is sequentially supplied to the first latch unit 520. However, the read image data signal RVDS is once written in the new frame memory and output from the new frame memory as a configuration including a new frame memory in front of the first latch unit 520. The read image data signal may be sequentially latched by the first latch unit 520. In this case, the image data signal input to the motion amount detection unit 60 may be an image data signal written to a new frame memory and an image data signal read from a new frame memory.

D5. Modification 5:
In each of the above embodiments, the case where mask data is generated for each pixel of read image data has been described as an example. However, the mask data may be generated only for a pixel for which replacement is to be performed. In this way, any configuration may be used as long as mask data corresponding to a pixel to be replaced can be generated and mask data can be replaced.

D6. Modification 6:
In each of the embodiments described above, an example is described in which each block of the memory write control unit, the memory read control unit, the drive image data generation unit, and the motion amount detection unit for generating the drive image data is constructed by hardware. However, at least a part of the blocks may be constructed by software so that the CPU reads and executes the computer program.

1 is a block diagram showing a configuration of an image display system to which an image data processing apparatus as a first embodiment of the present invention is applied. 3 is a schematic block diagram illustrating an example of a configuration of a drive image data generation unit 50. FIG. 5 is a schematic block diagram illustrating a configuration of a mask data generation unit 530. FIG. It is explanatory drawing shown about the table data stored in the mask parameter reference table 536. FIG. It is explanatory drawing shown about the drive image data produced | generated. 6 is a timing chart illustrating a drive image data signal generation operation. It is explanatory drawing shown about the 1st modification of the drive image data produced | generated. It is explanatory drawing shown about the 2nd modification of the drive image data produced | generated. It is explanatory drawing shown about the 3rd modification of the drive image data produced | generated. It is a timing chart shown about generation operation of a drive image data signal as the 3rd modification. It is explanatory drawing shown about the 4th modification of the drive image data produced | generated. It is explanatory drawing shown about the 5th modification of the drive image data produced | generated. It is explanatory drawing shown about the 6th modification of the drive image data produced | generated. It is a block diagram which shows the structure of the image display system to which the image data processing apparatus as 2nd Example is applied. It is a schematic block diagram which shows the structure of the drive image data generation part 50F. It is a schematic block diagram which shows the structure of the mask data generation part 530F. It is explanatory drawing shown about the table data stored in the light control parameter reference table 538. FIG. It is a block diagram which shows the structure of the image display system to which the image data processing apparatus as 3rd Example is applied. It is a schematic block diagram which shows the structure of the drive image data generation part 50G. It is a schematic block diagram which shows the structure of the mask data generation part 530G. It is explanatory drawing shown about the modification of the characteristic of the mask parameter MP with respect to the motion amount Vm which table data represents.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Signal conversion part 20 ... Frame memory 30 ... Memory write control part 40 ... Memory read-out control part 50 ... Drive image data generation part 50F ... Drive image data generation part 50G. ..Drive image data generation unit 60 ... Motion amount detection unit 70 ... Liquid crystal panel drive unit 80 ... CPU
DESCRIPTION OF SYMBOLS 90 ... Memory 100 ... Liquid crystal panel 110 ... Light source unit 110F ... Dimming light source unit 120 ... Projection optical system 510 ... Mask control part 520 ... Latch part 530 ... Mask Data generation unit 530F ... Mask data generation unit 530G ... Mask data generation unit 532 ... Operation unit 534 ... Operation selection unit 536 ... Mask parameter reference table 536G ... Mask parameter storage unit 538. Dimming parameter reference table 540 ... Latch section 550 ... Multiplexer (MPX)
DP1 ... Image display system DP2 ... Image display system DP3 ... Image display system

Claims (24)

An image data processing device for generating drive image data for driving an image display device,
An image memory for sequentially storing input image data of a plurality of input frames;
A writing control unit for controlling writing to the image memory;
A read control unit for controlling reading from the image memory;
A drive image data generation unit for generating the drive image data from read image data sequentially read from the image memory,
The drive image data generation unit generates the drive image data by replacing at least a part of the read image data with mask data,
The pixel value represented by the mask data is determined to be smaller than the pixel value represented by the corresponding read image data according to the pixel value represented by the read image data corresponding to the pixel replaced with the mask data. An image data processing apparatus.   The mask data is generated by computing the read image data corresponding to the pixel to be replaced with the mask data based on a predetermined parameter determined according to the amount of movement of the entire image represented by the read image data. The image data processing apparatus according to claim 1, wherein:   The predetermined parameter is such that the ratio of the mask data to the pixel value of the corresponding read image data is within a range from 0 to 1, and the smaller the motion amount, the smaller the motion amount. 3. The image data processing apparatus according to claim 2, wherein the image data processing apparatus is set to be large. The image data processing apparatus according to claim 3,
The image data processing apparatus, wherein the predetermined parameter is set so that the ratio is 1 when the movement amount is larger than a predetermined amount.   5. The image data processing apparatus according to claim 4, wherein the predetermined amount is a magnitude corresponding to a limit visual angular velocity indicating a speed limit of a follow-up movement of the eyeball. An image data processing apparatus according to any one of claims 1 to 5,
The drive image data generation unit is a drive in which the read image data and the mask data are alternately arranged for every m (m is an integer of 1 or more) horizontal lines of an image displayed on the image display device. An image data processing apparatus that generates first and second drive image data, which are image data, wherein the arrangement order of the read image data and the mask data is different from each other.   The image data processing apparatus according to claim 6, wherein m = 1. The image data processing device according to claim 6 or 7,
The drive image data generation unit alternately generates the first drive image data and the second drive image data in units of images displayed on the image display device. apparatus. An image data processing apparatus according to any one of claims 1 to 5,
The image data generation unit is a drive image in which the read image data and the mask data are alternately arranged for every n (n is an integer of 1 or more) vertical lines of an image displayed on the image display device. An image data processing apparatus for generating first and second drive image data, which are data, the arrangement order of the read image data and the mask data being different from each other.   The image data processing apparatus according to claim 9, wherein n = 1. The image data processing device according to claim 9 or 10,
The drive image data generation unit alternately generates the first drive image data and the second drive image data in units of images displayed on the image display device. apparatus. An image data processing apparatus according to any one of claims 1 to 5,
The drive image data generation unit is a block unit of p pixels (p is an integer of 1 or more) in the horizontal direction and q pixels (q is an integer of 1 or more) in the vertical direction of an image displayed on the image display device. Drive image data in which the read image data and the mask data are alternately arranged in the horizontal direction and the vertical direction, and the arrangement order of the read image data and the mask data is different from each other. An image data processing apparatus for generating drive image data of   13. The image data processing apparatus according to claim 12, wherein p = q = 1. The image data processing apparatus according to claim 12 or 13,
The drive image data generation unit alternately generates the first drive image data and the second drive image data in units of images displayed on the image display device. apparatus. An image data processing apparatus according to any one of claims 1 to 5,
The drive image data generation unit includes s (s is a divisor of r) continuous for r pixels (r is an integer of 3 or more) arranged in each horizontal line of an image displayed on the image display device. The mask data is arranged in the pixels, and the positions of the s pixels with respect to the r pixels are alternately shifted every t (t is an integer of 1 or more) the horizontal lines. An image data processing apparatus for generating first to (r / s) drive image data, which is image data, wherein the arrangement positions of the mask data are different from each other. The image data processing device according to claim 15,
The drive image data generation unit sequentially generates the first to (r / s) drive image data in units of images displayed on the image display device. An image data processing apparatus according to any one of claims 1 to 5,
The drive image data generation unit includes, as the drive image data, first drive image data in which an entire image displayed on the image display device is the read image data, and an image displayed on the image display device. An image data processing apparatus for generating second drive image data, the entirety of which is the mask data. An image data processing apparatus according to any one of claims 1 to 17,
The image data processing apparatus, wherein the read image data is read from the image memory at a rate that is a multiple of a frame rate at which the input image data of the plurality of frames is input. The image data processing device according to claim 2,
The drive image data generation unit generates dimming data for adjusting the emission light amount of the image display device according to the amount of movement by a dimming unit that controls the emission light amount of the image display device. An image data processing apparatus.   An image display system comprising: the image data processing device according to any one of claims 1 to 19; and the image display device. The image display system according to claim 20, further comprising:
A light control unit for controlling the amount of light emitted from the image display device,
The drive image data generation unit generates dimming data for adjusting the amount of light emitted from the image display device by the dimming unit according to the amount of movement. The image display system according to claim 21, wherein
The image display device is a non-luminous display device,
The light control unit is
A light source that emits illumination light that illuminates the image display device;
A control unit that controls the amount of light emitted from the light source according to the light control data. The image display system according to claim 22, wherein
The light source includes a main light source and a sub light source,
The said control part controls the emitted light quantity of the said sublight source, The image display system characterized by the above-mentioned. An image data processing method for generating drive image data for driving an image display device,
Sequentially writing input image data of a plurality of frames into an image memory;
Sequentially reading the input image data for each of the input image data sequentially written to the image memory;
Generating the drive image data from read image data sequentially read from the image memory,
The step of generating the drive image data generates the drive image data by replacing at least a part of the read image data with mask data,
The pixel value represented by the mask data is determined to be smaller than the pixel value represented by the corresponding read image data according to the pixel value represented by the read image data corresponding to the pixel replaced with the mask data. An image data processing method characterized by the above.

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