JP2009251026A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device in which coloring caused by brightness misalignment is avoided in moving image display. <P>SOLUTION: The image display device provided with a display panel for displaying an image on the basis of a grayscale data, comprises: a frame frequency converter which doubles the frame frequency of the grayscale data, and which outputs the grayscale data to each of a second frame, and a first frame of one frame ahead of the second frame; a first filter processor for creating a blurring grayscale data from the grayscale data of the first frame; a second filter processor for creating the blurring grayscale data and an edge emphasized grayscale data from the grayscale data of the second frame; a correction processor for correcting the edge emphasized grayscale data of the second frame on the basis of a difference between the second frame and the blurring grayscale data of the first frame; and a display control circuit for alternately displaying the edge emphasized grayscale data after correction processing, which is created by the correction processor, and the blurring grayscale data of the second frame created by the second filter processor, on the display panel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image display device, and more particularly to an image display device such as a liquid crystal display for displaying a moving image.

For example, in a liquid crystal display, when moving images are displayed, moving image blur occurs in which moving parts of the images appear blurred, and there is a problem that the image quality of the display image is deteriorated. There are two factors that cause this motion blur. One is a problem that the response speed of the liquid crystal material is slow, and the other is a problem of holding type display characteristics that emits constant light for one frame period.

As a countermeasure against the response delay of such a liquid crystal material, first, using a frame memory delayed by one frame, adding correction data to the display data of the current frame based on the comparison of the display data of the current frame and the previous frame. There is an overdrive system that speeds up the response of the liquid crystal material (see Patent Document 1 below). However, even if the response of the liquid crystal molecules is improved, it is difficult to improve the moving image blur caused by the hold type display characteristic itself. As a countermeasure for the hold type display characteristic, by inserting black data (blanking data) within one frame period, a video display period and a black display period are allocated in one frame period, and the hold period is shortened. (See Patent Document 2). However, the method of intermittently displaying an image has the disadvantage that the display becomes darker than the conventional hold-type image display device because the black display period described above exists.

Therefore, in order to avoid such a problem, the frame frequency of the input image signal is multiplied by an integer to generate a new image signal (generated image signal), and the input image signal and the generated image signal are alternately switched for each frame. What has been displayed has been known. Here, the generated image signal takes a linear sum of successive input image signals to generate a first intermediate image signal, and the first intermediate image signal is processed by a low-pass filter to obtain a second intermediate image signal. Only the second intermediate image signal corresponding to the fluctuation region of the continuous input image signal is extracted to generate the third intermediate image signal, and only the image signal in the non-fluctuation region of the continuous input image signal is generated. Is extracted to generate a common image signal, and the third intermediate image signal and the common image signal are synthesized (see Patent Document 3 below).
Japanese Patent Laid-Open No. 2001-117074 Japanese Patent Laid-Open No. 2001-220832 Japanese Patent Laid-Open No. 2006-259689

  However, the image display device that alternately displays the input image signal and the generated image signal for each frame is combined with the input pixel signal and the generated image signal in consideration of the line-of-sight direction in the case of the moving image display. The luminance of the image is shifted with respect to a desired input image signal. For this reason, the portion with the shifted luminance is colored and visually recognized.

  An object of the present invention is to provide an image display device in which coloring due to a luminance shift is avoided in moving image display.

   The image display apparatus of the present invention multiplies the frame frequency of an input image signal by an integral multiple to generate an image signal (edge enhancement signal) and a blurred image signal in which edges are emphasized from the input image signal through filter processing, and for each frame. The edge emphasis signal and the blur signal are alternately displayed. As a result, it is possible to correct the luminance shift of the conventional technique based on the difference between the images in the preceding and succeeding frames.

  The configuration of the present invention can be as follows, for example.

(1) An image display device according to the present invention includes, for example, a display panel that displays an image based on gradation data,
A frame frequency converter for doubling the frame frequency of the gradation data and outputting the gradation data to each of the second frame and the first frame one frame before the second frame;
A first filter processor for generating blur gradation data from gradation data of the first frame;
A second filter processor for generating blurred gradation data and gradation data with enhanced edges from gradation data of the second frame;
A correction processor for correcting gradation data in which the edge of the second frame is emphasized based on the difference between the blurred gradation data of the second frame and the first frame;
The gradation data emphasizing the corrected edge generated by the correction processor and the blur gradation data of the second frame generated by the second filter processor are alternately displayed on the display panel for each frame. And a display control circuit.

(2) An image display device according to the present invention is based on, for example, the configuration of (1), and the correction processor performs blurring of the second frame based on a difference between blur gradation data of the second frame and the first frame. It has a function to correct gradation data,
The display control circuit alternately displays the gradation data in which the corrected edge generated by the correction processor is emphasized and the blurred gradation data corrected by the correction processor on the display panel for each frame. It is characterized by doing.

(3) The image display device according to the present invention is based on, for example, the configuration of (1), and the correction processor multiplies the difference between the blur gradation data of the second frame and the first frame by 1/2. The data is added to the gradation data in which the edge of the second frame is enhanced to obtain gradation data in which the corrected edge of the second frame is enhanced.

(4) An image display device according to the present invention is based on, for example, the configuration of (2), and the correction processor multiplies the difference between each gradation gradation data of the second frame and the first frame by 1/2. The data is added to the blur gradation data of the second frame to obtain corrected blur gradation data of the second frame.

(5) The image display apparatus according to the present invention is based on, for example, the configuration of (1), and the second filter processor subtracts the blurred gradation data of the second frame from the gradation data of the second frame. Further, it is characterized in that gradation data with enhanced edges is generated.

(6) The image display device according to the present invention, for example, takes the gradation data of the second frame and the first frame on the premise of the configuration of (1), and within one frame period according to the combination of these gradation data. Based on a table storing correction values adjusted so that the pixel response reaches the desired luminance, gradation data obtained by adding or subtracting the correction values to the gradation data of the second frame is used for the second filter processing. An overdrive device for outputting is provided.

(7) The image display device according to the present invention is based on, for example, the configuration of (1), and is based on the difference between the blurred gradation data of the second frame and the first frame, or the gradation data or the blurred gradation with enhanced edges. Gradation data or blurred gradation data emphasizing the corrected edge output from the correction processor for correcting data and blurred gradation data or edge of the second frame output from the second filter processor. Based on a table storing correction values adjusted so that the response of a pixel reaches a desired luminance within one frame period according to the combination of emphasized gradation data, from the gradation data after correction processing and the filter processor Data obtained by adding or subtracting the correction value to gradation data or blurred gradation data in which the edge of the output second frame is emphasized is displayed on the display panel. Characterized in that it comprises an overdrive device to force.

(8) The image display device according to the present invention, for example, on the premise of the configuration of (1), compares the gradation data of the second frame and the first frame from the frame frequency converter, and if they match, The gradation data is output to the display panel.

(9) An image display device according to the present invention includes, for example, a display panel that displays an image based on gradation data,
A frame frequency converter for doubling the frame frequency of the gradation data and outputting the gradation data to each of the first frames one frame before the second frame;
A first luminance converter that converts gradation data of the first frame into luminance data; a first filter processor that generates blur luminance data from the luminance data from the first luminance converter;
A second luminance converter for converting the gradation data of the second frame into luminance data, and a second filter processing for generating blur luminance data and luminance data with enhanced edges from the luminance data from the second luminance converter And
A correction processor for correcting the luminance data in which the edge of the second frame is emphasized based on the difference between the blurred luminance data of the second frame and the first frame;
The luminance data with enhanced edge generated by the correction processor and the blurred luminance data of the second frame generated by the second filter processor are respectively converted into gradation data and blurred gradation with edge enhanced. A data converter for converting to key data;
And a display control circuit for alternately displaying the grayscale data and the blurred grayscale data with the edge enhanced from the data converter on the display panel for each frame.

(10) The image display device according to the present invention is based on, for example, the configuration of (9), and the correction processor determines the blur brightness of the second frame based on the difference between the blur brightness data of the second frame and the first frame. It has a function to correct data,
The display control circuit alternately displays the gradation data in which the corrected edge generated by the correction processor is emphasized and the blurred gradation data corrected by the correction processor on the display panel for each frame. It is characterized by doing.

(11) An image display device according to the present invention is based on, for example, the configuration of (9), and the correction processor multiplies the difference between each gradation gradation data of the second frame and the first frame by 1/2. The data is added to the gradation data in which the edge of the second frame is enhanced to obtain gradation data in which the corrected edge of the second frame is enhanced.

(12) An image display device according to the present invention is based on, for example, the configuration of (10), and the correction processor multiplies the difference between each gradation gradation data of the second frame and the first frame by 1/2. The data is added to the blur gradation data of the second frame to obtain corrected blur gradation data of the second frame.

(13) The image display device according to the present invention is premised on the configuration of (9), for example, and the second filter processor subtracts the blur luminance data of the second frame from the luminance data of the second frame, thereby obtaining an edge. Brightness data with emphasis on the brightness is generated.

(14) The image display device according to the present invention, for example, on the premise of the configuration of (9), takes in the luminance data of the second frame and the first frame, and within one frame period according to the combination of these luminance data Based on a table storing correction values adjusted so that the pixel response reaches the desired luminance, luminance data obtained by adding or subtracting the correction value to the luminance data of the second frame is output to the second filter processing. An overdrive device is provided.

(15) The image display device according to the present invention, for example, on the premise of the configuration of (9), corrects the luminance data or the blurred luminance data with enhanced edges based on the difference between the blurred luminance data of the second frame and the first frame. A combination of luminance data or blurred luminance data with enhanced edge output from the correction processor and the second frame of blurred luminance data or luminance data with emphasized edge output from the second filter processor. The brightness data after correction processing and the edge of the second frame output from the filter processor based on a table storing correction values adjusted so that the pixel response reaches the desired brightness within one frame period The display panel displays data obtained by adding or subtracting the correction value to luminance data or blurred luminance data with emphasis on Characterized in that it comprises an overdrive device to output.

(16) The image display apparatus according to the present invention, for example, on the premise of the configuration of (9), compares the gradation data of the second frame and the first frame from the frame frequency converter, and if they match, The gradation data is output to the display panel.

  In addition, this invention is not limited to the above structure, A various change is possible in the range which does not deviate from the technical idea of this invention. Further, examples of the configuration of the present invention other than the above-described configuration will be clarified from the entire description of the present specification or the drawings.

  According to the image display device of the present invention, it is possible to avoid coloring due to a luminance shift in moving image display.

  Other effects of the present invention will become apparent from the description of the entire specification.

  Embodiments of the present invention will be described with reference to the drawings. In each drawing and each example, the same or similar components are denoted by the same reference numerals and description thereof is omitted.

<Example 1>
FIG. 1 is a block diagram showing a schematic configuration of an image display apparatus according to the present invention. In FIG. 1, reference numerals 100 to 110 denote blocks for performing signal control, and reference numerals 111 to 121 denote signal paths.

In the present embodiment and the following embodiments, the processing methods in the screen horizontal line direction and the vertical line direction are the same for the low-pass filter processing. Therefore, in this embodiment and the following embodiments, the horizontal line direction is the target. The process flow will be described. In the following description, an image signal having gradation information is a gradation image signal, an image signal having luminance information is a luminance image signal, and a gradation image signal and luminance image having blur information generated by low-pass filter processing are used. The signals are defined as a blurred gradation image signal and a blurred luminance image signal, respectively, and the gradation image signal and the luminance image signal having edge enhancement information are defined as an edge enhanced gradation image signal and an edge enhanced luminance image signal, respectively. .

111 is a gradation image signal, and 112 is an input control signal. The gradation image signal 111 and the input control signal 112 are signals input from an external system (not shown). The frame doubler 101 performs the writing operation of the gradation image signal 112 based on the memory control signal 120 output from the control signal generation unit 100, and at the same time doubles the gradation image signal 114 of the current frame and the previous frame. Reading operation of the gradation image signal 113 is performed. Here, in this embodiment and the following embodiments, a period based on the first half read operation is a first field and a period based on the second half read operation is a second field with respect to one frame period. That is, the frame doubler 101 has a function of doubling the frame frequency. If the frame frequency of the gradation image signal 111 input to the frame doubler 101 is, for example, 60 Hz, the gradation image signal 111 is output. When converted, the frame frequency is converted to 120 Hz. Further, the frame doubler 101 is not limited to the gradation image signal 111 having a frame frequency of 60 Hz, and can deal with the gradation image signal 111 having another frequency. The frame doubler 101 may be installed in the external system.

      As shown in FIG. 2, the resolution of the liquid crystal display 110 used in this embodiment and the following embodiments is I × J (I and J are both integers), and a coordinate system indicating the position of the pixel on the liquid crystal display 110 is used. The gradation image signal at the pixel (m, n) input to the frame doubler 101 at the (i) frame is denoted as Dmn (i).

Hereinafter, a case where the gradation image signal Dmn (i) is output from the frame doubler 101 in the present embodiment and the following embodiments will be described.

FIG. 3 shows the overall processing flow in this embodiment. The image signal names shown in FIG. 3 will be described later.

  In the present embodiment, the edge-enhanced gradation image signal is displayed on the first field and the blurred gradation image signal is displayed on the liquid crystal display 110 in the second field. The gradation image signal Dmn (i−1) and the gradation image signal Dmn (i) generated by the frame doubler 101 are converted into luminance image signals by the luminance conversion units 102 and 103 (see FIG. 1), respectively. The luminance image signals converted here are hereinafter referred to as Bmn (i-1) and Bmn (i), respectively.

The luminance image signal Bmn (i−1) generated by the luminance conversion unit 102 (see FIG. 1) is input to the filter processing unit 104 (see FIG. 1), and the luminance image signal Bmn (i) is input to the filter processing unit 105 (see FIG. 1). 1). The filter processing unit 104 converts the luminance image signal Bmn (i−1) into a blurred luminance image signal and outputs it. For example, the filter processing unit 104 removes the high frequency component of the luminance image signal Bmn (i−1) by passing the luminance image signal Bmn (i−1) through a low-pass filter that passes other than a predetermined frequency component, It is possible to obtain a blurred luminance image signal having only a low frequency component of the luminance image signal Bmn (i-1). The filter processing unit 105 generates and outputs a blurred luminance image signal and an edge enhanced luminance image signal from the luminance image signal Bmn (i). The generation method of the blurred luminance image signal in the filter processing unit 105 is the same as described above. A method for generating the edge-enhanced luminance image signal in the filter processing unit 105 will be described later. Here, considering that still images are displayed, the filter processing unit 105 performs filtering so that the average of the blurred luminance image signal and the edge-enhanced luminance image signal matches the luminance image signal input to the filter processing unit. Process. In this embodiment and in the following embodiments, the blurred luminance image signal and the edge-enhanced luminance image signal are denoted as LPBmn (i) and HPBmn (i), respectively. The blurred luminance image signal LPBmn (i-1) passes through the signal bus 117, and the blurred luminance image signal LPBmn (i) passes through the signal bus 119 and is input to the luminance deviation correction processing unit 106 (see FIG. 1). The

  Next, the filter processing unit 105 that generates a blurred luminance image signal and an edge enhanced luminance image signal will be described with reference to FIG. The following description is the same for the filter processing unit 104. FIG. 4 shows an internal block of the filter processing unit 105. In FIG. 4, reference numeral 400 indicates a multiplication unit, reference numeral 401 indicates an LPF processing unit, and reference numeral 402 indicates a subtraction unit. First, the luminance image signal Bmn (i) is input to the filter processing unit 105 and input to the multiplication unit 400 and the LPF processing unit 401. The luminance image signal Bmn (i) input to the multiplier 400 is converted to 2 × B1mn (i). On the other hand, the luminance image signal Bmn (i) input to the LPF processing unit 401 is converted into a blurred luminance image signal LPBmn (i) and then output. When the luminance image signal Bmn (i) is input to the LPF processing unit 401, the left and right M pixels (M is an integer of 0 or more) centering on the pixel (m, n), that is, a total of (2M + 1) pixels The luminance image signal in the range is averaged to generate and output a blurred luminance image signal LPBmn (i). Based on the blurred luminance image signal LPBmn (i) and 2 × Bmn (i) output from the multiplier 400, the subtracting unit 402 subtracts the blurred luminance image signal LPBmn (i) from 2 × Bmn (i). Thus, the edge-enhanced luminance image signal HPBmn (i) is generated. As a result, the high-frequency component of the luminance image signal Bmn (i) (the component appearing at the edge portion) is added (emphasized) to the luminance image signal Bmn (i). Accordingly, the luminance deviation correction processing unit 106 is input with three luminance image signals of the blurred luminance image signal LPBmn (i−1), the blurred luminance image signal LPBmn (i), and the edge enhanced luminance image signal HPBmn (i). . The luminance deviation correction processing unit 106 has a function of suppressing luminance deviation which is a problem of the background art.

  Next, the configuration of the luminance deviation correction processing unit 106 will be described with reference to FIG. In FIG. 5, the subtraction unit 500 generates a difference signal between the blurred luminance image signal LPB (i) and the blurred luminance image signal LPB (i−1), and the multiplication unit 501 further adds (1/2) to the difference data. ) And input to the adder 502. The difference data input to the adding unit 502 is added to HPB (i) and output. In addition to the corrected edge-enhanced luminance image signal HPB (i) and the blurred luminance image signal LPB (i) output from the adder 502, the selector 503 includes a selector output from the control signal generator 100. A signal 121 is input. When the selector signal 121 is “high”, the corrected edge-enhanced luminance image signal HPB (i) is output from the data selection unit 503 to the data conversion unit 107, and when the selector signal 121 is “low”, the blurred luminance image The signal LPB (i) is output to the data converter 107.

FIG. 6 shows a luminance image signal Bmn (i) input to the LPF processing unit 401 and an edge output from the LPF processing unit 401 using a coordinate system in which the horizontal axis represents distance (pixels) and the vertical axis represents luminance. The enhanced luminance image signal HPBmn (i) and the blurred luminance image signal LPBmn (i) are respectively arranged in data. 6A shows the luminance image signal Bmn (i), FIG. 6B shows the edge enhanced luminance image signal HPBmn (i), and FIG. 6C shows the blurred luminance image signal LPBmn (i). . In the drawing, symbols Ba and Bb indicate luminances, respectively, and the relationship Ba <Bb is satisfied in the present embodiment and the following embodiments. The data array 600 of the luminance image signal input to the LPF processing unit 401 is based on the input luminance data B (i), and the data array 601 of the edge enhanced luminance image signal output from the subtraction unit 402 is the edge enhanced luminance data. The data array 602 of the blurred luminance image signal output from the HPB (i) and LPF processing unit 401 is defined as blurred luminance data LPB (i). Hereinafter, in this embodiment, for convenience of description, description will be made using luminance data instead of the luminance image signal.

Next, an algorithm for suppressing a luminance shift will be described with reference to FIGS. This algorithm is hereinafter referred to as a suppression algorithm.

  In FIG. 7A, edge-enhanced image data HPB (i) (reference numeral 701 in the figure) input to the first field is input to the second field below the figure. The blurred luminance image data LPB (i) (reference numeral 702 in the figure) is shown. In the figure, reference numeral 700 corresponds to (2M + 1) pixel ranges used in the LPF processing unit 401.

FIG. 7B shows the edge-enhanced image data HPB (i) and luminance image data LPB (i).
Based on a two-dimensional coordinate system (upper side of the figure) with the response speed of the liquid crystal set to 0, distance (unit: pixel) on the horizontal axis and time (unit: field) on the vertical axis, An integrated luminance waveform 705 (lower side in the figure) obtained by integrating the luminance image data moved at the scroll speed 703 in the line-of-sight tracking direction 704 is shown. As is apparent from the integrated luminance waveform 705, luminance deviation occurs before and after the luminance change (within the dotted elliptic frame in the figure). Here, as a countermeasure against this luminance shift, in the present embodiment, data correction is performed only on the edge-enhanced luminance data 701, but it may be corrected to blur luminance data 702 instead of the edge-enhanced luminance data 701.

  Here, the edge-enhanced luminance data after the correction processing necessary for suppressing the luminance deviation is represented by the following equation (1).

HPBC (i) = HPB (i) + (LPB (i) −LPB (i−1)) / 2 (1)
In the above equation (1), HPBC (i) represents edge-enhanced luminance data corrected by the luminance deviation correction processing unit 106 in the present embodiment and the following embodiments.

  FIG. 8 shows the flow of processing based on the above equation (1).

FIG. 8A corresponds to the lower diagram of FIG. 7B, and the shaded portion in the diagram indicates a range necessary for correcting the luminance data. FIG. 8B shows blurred luminance data LPB (i−1), which corresponds to LPB (i−1) shown in the above equation (1). FIG. 8C shows blurred luminance data LPB (i), which corresponds to LPB (i) shown in the above equation (1). FIG. 8D shows the difference between the blurred luminance data LPB (i) and the blurred luminance data LPB (i−1), and LPB (i) −LPB (i−1) expressed by the above equation (1). ). FIG. 8E shows edge-enhanced luminance data HPB (i), which corresponds to HPB (i) shown in the above equation (1). FIG. 8F shows corrected edge-enhanced luminance data HPBC (i), which corresponds to HPBC (i) shown in the above equation (1). In FIG. 8F, the edge-enhanced luminance data HPB (i) is drawn with a dotted line for easy comparison.

FIG. 9 is a diagram drawn corresponding to FIG. 7B, and the integrated luminance obtained when the luminance data HPBC (i) is input to the first field and the luminance data LPB (i) is input to the second field. Waveform 900 is shown. It can be seen that the integrated luminance waveform 900 can greatly suppress the luminance shift with respect to the desired luminance before and after the luminance change, as compared with the integrated luminance waveform 705 shown in FIG.

However, it is confirmed that a luminance shift occurs in the portions indicated by reference numerals 901 and 902 on the integrated luminance waveform 900. However, the magnitude of the luminance deviation in this portion is extremely small with respect to the magnitude of the luminance deviation shown by the integrated luminance waveform 705 and is inversely proportional to the filter processing range. Therefore, by increasing the filter processing range, It becomes possible to suppress.

The luminance image signal output from the luminance deviation correction processing unit 106 (see FIG. 1) is input to the data conversion unit 107, converted into a gradation image signal, and then output to the data driver 109. The gradation image signal output from the data converter 107 is hereinafter referred to as BD (i). The gate driver 108 and the data driver 109 drive the gate lines and data lines of the liquid crystal display panel based on the control signals output from the control signal generation unit 100, respectively, and display pixels.

<Example 2>
FIG. 10 is a diagram showing Example 2 of the image display device according to the present invention and corresponds to FIG. In the second embodiment, when a still image is displayed in the first embodiment and the error due to the bit calculation in the filter processing range 700 is large, the average of LPBmn (i) and HPBmn (i) does not match Bmn (i). Since uneven brightness occurs in the display surface, the uneven brightness is eliminated.

  That is, the data selection unit 1000 is provided at the subsequent stage of the data conversion unit 107, and the present invention shown in the first embodiment is not applied by switching the data selection unit 1000 when displaying a still image. . More specifically, the data selection unit 1000 receives the gradation image signal BD (i) from the data conversion unit 109, the gradation image signal Dmn (i-1), and the gradation image signal Dmn (i) from the frame doubler 101. Each signal is input. The data selection unit 1000 compares the gradation image signal Dmn (i) with the gradation image signal Dmn (i-1), and the gradation image signal Dmn (i) and the gradation image signal Dmn (i-1). When the tone image signals Dmn (i) and the tone image signal Dmn (i) do not match, the tone image signal Dmn (i) is output to the liquid crystal device 101. The signal BD (i) is output to the data driver 109. For this reason, when a still image is displayed, a gradation image signal without filter processing is input to the liquid crystal display panel 110, so that in-plane luminance unevenness due to bit calculation errors can be prevented. Also in the following embodiments, the data selection unit 1000 may be provided as a means for dealing with luminance unevenness during still image display.

<Example 3>
FIG. 11 is a diagram showing Embodiment 3 of the image display apparatus of the present invention, and corresponds to FIG. In FIG. 3, edge enhanced luminance data HPB (i) is assigned to the first field, and blurred luminance data LPB (i) is assigned to the second field, whereas in FIG. 11, the blurred luminance data LPB ( i) differs in that edge-enhanced luminance data HPB (i) is assigned to the second field.

As shown in FIG. 11, when the blurred luminance data LPB (i) is assigned to the first field and the edge enhanced luminance data HPB (i) is assigned to the second field, the integrated luminance waveform obtained under the same conditions as in the first embodiment. Is as shown in FIG. FIG. 12 corresponds to FIG. 7B. As will be apparent from FIG. 12, as in the first embodiment, a deviation occurs with respect to the desired luminance within the dotted elliptic frame in the figure. This luminance deviation occurs in the opposite direction to the luminance deviation of the integrated luminance waveform 705 obtained in the first embodiment, and the magnitude of the deviation is the same value. Therefore, regarding the suppression algorithm for dealing with luminance deviation, the edge-enhanced luminance data HPB (i) is corrected based on LPB (i) -LPB (i-1) in the first embodiment. Considering this, in the third embodiment, luminance deviation is suppressed by correcting the edge-enhanced luminance data HPB (i) based on LPB (i-1) -LPB (i). The edge-enhanced luminance data HPBC (i) after correction processing generated in this way is expressed by the following equation (2).

HPBC (i) = HPB (i) + (LPB (i−1) −LPB (i)) / 2 (2)
The integrated luminance waveform obtained when the luminance image signal HPBC (i) is input to the first field and the luminance image signal LPB (i) is input to the second field is the same as that in the first embodiment, as shown in FIG. Luminance shift occurs in the range indicated by reference numerals 901 and 902. However, the luminance deviation is also opposite to that in the first embodiment and the magnitude of the deviation is the same, and can be suppressed by increasing the filter processing range.

<Example 4>
FIG. 13 is a view showing Embodiment 4 of the image display apparatus of the present invention and corresponds to FIG. In FIG. 13, a different configuration from that in FIG. 1 is that an overdrive device 1300 is installed between the frame doubler 101 and the luminance conversion unit 103. In brief, the overdrive device 1300 captures the gradation data of the current frame and the previous frame, and the response of the liquid crystal molecules reaches the desired luminance within one frame period according to the combination of the gradation data. On the basis of a table storing correction values adjusted in such a manner, gradation data obtained by adding or subtracting the correction value to the gradation data of the current frame is obtained. This is because the overdrive device 1300 improves the response of liquid crystal molecules in the liquid crystal display 110.

That is, the overdrive device 1300 has a function of outputting the gradation image signal in the current frame based on the gradation image signal in the previous frame and the gradation image signal in the current frame. The gradation image signal of the current frame output from the overdrive device 1300 is denoted as ODmn (i). Further, the overdrive device 1300 includes an overdrive lookup table configured by a two-dimensional map composed of two gradation image signals to be referred to when outputting. This overdrive lookup table stores correction values adjusted so that the response of the liquid crystal molecules reaches the desired luminance within one frame period in accordance with the combination of values in the two gradation image signals to be referred to. It is a table. Therefore, in this embodiment, ODmn (i) is output based on the input combination of Dmn (i−1) and Dmn (i), and the output ODmn (i) is input to the luminance converter 103. The luminance image signal is output. Thereafter, the same processing flow as that described in the first embodiment is followed.

<Example 5>
FIG. 14 is a diagram showing Example 5 of the image display device of the present invention and corresponds to FIG. 14 is different from the case of FIG. 1 in that an overdrive device 1400 is installed at a stage subsequent to the luminance deviation correction processing unit 106. This is because the response of the liquid crystal molecules in the liquid crystal display 110 is improved as in the case of the fourth embodiment.

The overdrive device 1400 also includes an overdrive lookup table configured by a two-dimensional map. Then, a luminance image signal is output based on a combination of values in HPBC (i) and LPB (i) output from the luminance shift correction processing unit 106. The luminance image signal is converted into a gradation image signal by the data converter 107 and output to the data driver 109.

  Although the present invention has been described with reference to the embodiments, the configurations described in the embodiments so far are only examples, and the present invention can be appropriately changed without departing from the technical idea. Further, the configurations described in the embodiments may be used in combination as long as they do not contradict each other.

By applying the present invention, moving image blur in moving image display can be reduced while maintaining the display quality of still images. Therefore, the present invention can be applied to, for example, a TV receiver using a liquid crystal display panel, a display monitor such as a PC, a mobile phone, a game machine, and the like.

It is a block diagram which shows the structure of Example 1 of the image display apparatus of this invention. It is explanatory drawing which shows the coordinate of the pixel of the said pixel display apparatus. FIG. 3 is a timing diagram illustrating a data flow in units of frames according to the first exemplary embodiment. It is the block diagram which showed the structure of the filter process part shown in FIG. It is the block diagram which showed the structure of the brightness | luminance deviation correction process part shown in FIG. It is a figure which shows the brightness | luminance data and edge brightness | luminance data which edge-enhanced. It is explanatory drawing which showed the subject in detail in Example 1 to solve. It is a figure which shows the flow of the arithmetic processing performed in the said brightness | luminance deviation correction process part. It is explanatory drawing which shows the effect of Example 1. FIG. FIG. 6 is a block diagram illustrating a configuration of an image display apparatus according to a second embodiment of the present invention, corresponding to FIG. 1. FIG. 6 is a diagram illustrating a configuration of an image display device according to a third embodiment of the present invention, and corresponds to FIG. 3. It is explanatory drawing which showed the subject in detail in Example 3 to solve. FIG. 6 is a block diagram illustrating a configuration of an image display apparatus according to a fourth embodiment of the present invention, corresponding to FIG. 1. FIG. 6 is a block diagram illustrating a configuration of an image display apparatus according to a fifth exemplary embodiment of the present invention, corresponding to FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Control signal production | generation part, 101 ... Frame doubler, 102, 103 ... Luminance conversion part, 104, 105 ... Filter processing part, 106 ... Luminance shift correction processing part, 107 ... Data conversion part, 108 ... Gate driver, 109 ... Data Driver 110 ... Liquid crystal display 111, 113, 114 ... Gradation image signal 112 ... Input control signal 115, 116 ... Luminance image signal 117 ... Blurry luminance image signal of previous frame 118 ... Edge enhancement of current frame Luminance image signal, 119 ... Blurry luminance image signal of the current frame, 120 ... Memory control signal, 121 ... Selector signal, 400, 501 ... Multiplication unit, 401 ... LPF correction processing unit, 402, 500 ... Subtraction unit, 500 ... Subtraction unit , 502... Addition unit, 503... Selection unit, 600... Input luminance data, 601, 701. Di-enhanced luminance data, 602, 702 ... blurred luminance data, 700 ... filtering range, 703 ... scroll speed, 704 ... gaze tracking direction, 705, 900, 1200 ... integrated luminance waveform, 901,902 ... luminance deviation, 1000 ... data Selection unit, 1300, 1400... Overdrive device.

Claims (18)

Comprising a display panel for displaying an image based on gradation data,
A frame frequency converter for doubling the frame frequency of the gradation data and outputting the gradation data to each of the second frame and the first frame one frame before the second frame;
A first filter processor for generating blur gradation data from gradation data of the first frame;
A second filter processor for generating blurred gradation data and gradation data with enhanced edges from gradation data of the second frame;
A correction processor for correcting gradation data in which the edge of the second frame is emphasized based on the difference between the blurred gradation data of the second frame and the first frame;
The gradation data emphasizing the corrected edge generated by the correction processor and the blur gradation data of the second frame generated by the second filter processor are alternately displayed on the display panel for each frame. A display control circuit;
An image display device comprising: The correction processor has a function of correcting the blur gradation data of the second frame based on the difference between the blur gradation data of the second frame and the first frame,
The display control circuit alternately displays the gradation data in which the corrected edge generated by the correction processor is emphasized and the blurred gradation data corrected by the correction processor on the display panel for each frame. The image display device according to claim 1.   The correction processor adds the data obtained by multiplying the difference between the blurred gradation data of the second frame and the first frame by 1/2 to the gradation data in which the edge of the second frame is emphasized, The image display apparatus according to claim 1, wherein gradation data in which the corrected edge is emphasized is obtained.   The correction processor adds the data obtained by multiplying the difference between the blur gradation data of the second frame and the first frame by 1/2 to the blur gradation data of the second frame to correct the second frame. The image display apparatus according to claim 2, wherein blurred gradation data is obtained.   The said 2nd filter processor produces | generates the gradation data which emphasized the edge by subtracting the blurring gradation data of the 2nd frame from the gradation data of the 2nd frame. Image display device.   Based on a table storing correction values adjusted so that the response of a pixel reaches a desired luminance within one frame period in accordance with a combination of these gradation data, taking in each gradation data of the second frame and the first frame 2. The image display apparatus according to claim 1, further comprising an overdrive device that outputs gradation data obtained by adding or subtracting the correction value to the gradation data of the second frame to the second filter processing.   Gradation with emphasized edge outputted from the correction processor for correcting gradation data with enhanced edge or blurred gradation data based on difference between blurred gradation data of second frame and first frame Depending on the combination of the data or the blurred gradation data and the blurred gradation data of the second frame output from the second filter processor or the gradation data with the edge enhanced, the response of the pixel becomes a desired luminance within one frame period. Based on a table storing correction values adjusted so as to arrive, the correction is performed on gradation data after correction processing and gradation data or blur gradation gradation data that emphasizes the edge of the second frame output from the filter processor. The overdrive device that outputs data obtained by adding or subtracting values to the display panel is provided. Image display device.   2. The gradation data of the second frame and the first frame from the frame frequency converter are compared, and if they match, the gradation data is output to the display panel. Image display device. Comprising a display panel for displaying an image based on gradation data,
A frame frequency converter for doubling the frame frequency of the gradation data and outputting the gradation data to each of the first frames one frame before the second frame;
A first luminance converter that converts gradation data of the first frame into luminance data; a first filter processor that generates blur luminance data from the luminance data from the first luminance converter;
A second luminance converter for converting the gradation data of the second frame into luminance data, and a second filter processing for generating blur luminance data and luminance data with enhanced edges from the luminance data from the second luminance converter And
A correction processor for correcting the luminance data in which the edge of the second frame is emphasized based on the difference between the blurred luminance data of the second frame and the first frame;
The luminance data with enhanced edge generated by the correction processor and the blurred luminance data of the second frame generated by the second filter processor are respectively converted into gradation data and blurred gradation with edge enhanced. A data converter for converting to key data;
A display control circuit for alternately displaying gradation data and blurred gradation data on the edge from the data converter on the display panel for each frame;
An image display device comprising: The correction processor has a function of correcting the blur luminance data of the second frame based on the difference between the blur luminance data of the second frame and the first frame,
The display control circuit alternately displays the gradation data in which the corrected edge generated by the correction processor is emphasized and the blurred gradation data corrected by the correction processor on the display panel for each frame. The image display device according to claim 9.   The correction processor adds the data obtained by multiplying the difference between the blurred gradation data of the second frame and the first frame by 1/2 to the gradation data in which the edge of the second frame is emphasized, The image display apparatus according to claim 9, wherein gradation data in which the corrected edge is emphasized is obtained.   The correction processor adds the data obtained by multiplying the difference between the blur gradation data of the second frame and the first frame by 1/2 to the blur gradation data of the second frame to correct the second frame. The image display apparatus according to claim 10, wherein blurred gradation data is obtained.   The image display device according to claim 9, wherein the second filter processor generates luminance data with emphasized edges by subtracting the blur luminance data of the second frame from the luminance data of the second frame. .   Based on a table storing correction values adjusted so that the response of the pixel reaches the desired luminance within one frame period in accordance with the combination of each luminance data, taking in each luminance data of the second frame and the first frame The image display device according to claim 9, further comprising an overdrive device that outputs luminance data obtained by adding or subtracting the correction value to the luminance data of the second frame to the second filter processing.   Luminance data or blur brightness with enhanced edge output from the correction processor that corrects brightness data or blur brightness data with edge enhancement based on the difference between blur brightness data between the second frame and the first frame Correction adjusted so that the response of the pixel reaches the desired luminance within one frame period according to the combination of the data and the luminance data of the second frame output from the second filter processor or luminance data with enhanced edge Based on a table storing values, the luminance data after correction processing and the data obtained by adding or subtracting the correction value to the luminance data emphasizing the edge of the second frame output from the filter processor or the blur luminance data are displayed. The overdrive device for outputting to a panel is provided. Image display device.   The gradation data of the second frame and the first frame from the frame frequency converter are compared, and if they match, the gradation data is output to the display panel. Image display device. An image display device including a display panel that displays an image based on gradation data,
A first filter processor for generating low-frequency gradation data from which high-frequency components have been removed from gradation data of the (i-1) th frame (i is an integer);
Generating low-frequency gradation data in which high-frequency components are removed from gradation data of the i-th frame, and generating high-frequency enhancement gradation data in which high-frequency components of the gradation data of the i-th frame are emphasized. Two filter processors;
A correction processor for correcting the high-frequency emphasized gradation data of the i-th frame based on a difference between the (i-1) -th frame low-frequency gradation data and the i-th frame of low-frequency gradation data; ,
A display control circuit for displaying the high-frequency emphasized gradation data of the i-th frame and the low-frequency gradation data of the i-th frame alternately on the display panel for each frame;
An image display device comprising:   The correction processor calculates a value corresponding to a difference between the (i-1) th frame low-frequency gradation data and the i-th frame low-frequency gradation data as a high-frequency enhancement level of the i-th frame. 18. The image display device according to claim 17, wherein the high frequency emphasis gradation data of the i-th frame is corrected by adding to the tone data.

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