JP2010256540A - Liquid crystal display driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display driving device capable of suppressing deterioration in picture quality and applying an interlace display method to a liquid crystal display. <P>SOLUTION: The liquid crystal display driving device which is an interlace display type device for dividing one frame of the liquid crystal display into an odd field and an even field and sequentially driving scanning lines of respective fields includes: a buffer for storing pixel data correspondingly to the number of display elements of the scanning line;, a pixel data output part for outputting the pixel data stored in the buffer to data lines of the display elements; a scanning line driving part for driving the scanning lines in an odd or even field, and an image processing part for allowing the scanning line driving part to drive the scanning lines. When either one of the even field and the odd field is a driving target, the scanning line driving part drives the scanning line of the other field adjacent to the scanning line driven by one field by a time width shorter than the driving time of one scanning line. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a liquid crystal display driving apparatus that displays an image on a liquid crystal display.

Conventionally, a liquid crystal display is driven by a sequential operation process in which image data is output line by line to the liquid crystal display in order from the line located at the top of the screen, and the display element in the liquid crystal display element is controlled. (Progressive method) (for example, Patent Document 1).
On the other hand, when displaying a moving image, interlace driving is used as a method for displaying an image at high speed, and is used in a TV (Television) system or a CRT (Cathode Ray Tube) display.

JP 2007-304205 A

However, when the interlace drive is applied to a liquid crystal display, the liquid crystal display element performs hold-type display in which data of the previous pixel is held. It is updated alternately.
Therefore, as shown in FIG. 1, when a moving image in which a white image moves in the arrow direction (rightward direction) is displayed on the liquid crystal display by an interlace method, an even field for driving an even scan line for one frame and an odd scan. As shown in FIG. 2, even if new image data is displayed on the even lines, the previous image data is still displayed on the odd lines. Therefore, the contour in the moving direction of the image becomes jagged and the image quality deteriorates.
Due to the deterioration of the image quality, the interlace method often used for the TV system or the CRT display cannot be used for the liquid crystal display.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a liquid crystal display driving device capable of performing an interlaced display method on a liquid crystal display while suppressing the deterioration of the image quality.

[1] The present invention has been made to solve the above-described problems, and a liquid crystal display driving apparatus according to an aspect of the present invention provides an odd number of odd-numbered odd scanning lines on a display screen for one frame of a liquid crystal display. A liquid crystal display driving device for driving the liquid crystal display in an interlaced display method in which an image is displayed in the order of scanning lines of each group, grouped into fields and even fields composed of even-numbered lines. A buffer that accumulates pixel data of an image for the number of display elements in a scanning line, and a pixel data output unit that outputs each of the pixel data accumulated in the buffer in correspondence with a data line of the display element in a liquid crystal display; Each scan line is driven in turn in the odd field or even field unit. A scanning line driving unit that transfers the pixel data stored in the buffer to a pixel data control unit, and then causes the scanning line driving unit to drive the scanning line, and the scanning line driving unit However, when either one of the even field or the odd field is a driving target, the scanning line of the other field adjacent to the scanning line sequentially driven in the one field is set to the one scanning line. The driving is performed with a short time width with respect to the driving time.
Here, when the scanning lines corresponding to the rows of the display elements in either one of the even field and the odd field are sequentially driven, the scanning line is driven in this one field (in the embodiment, the pixel selection signal is a scanning line driving unit). The other scanning line (hereinafter referred to as non-driving scanning line) that is adjacent to the scanning line (hereinafter referred to as driving scanning line) is driven with a shorter time width than the driving time of the driving scanning line. I am letting.
Thus, according to the present invention, the display element of the non-driving scanning line that is not the driving target adjacent to the upper and lower sides of the display element of the driving scanning line is changed by the pixel data of the display element corresponding to the driving scanning line. In order to drive in a time shorter than the driving time, a low-pass filter process in the vertical direction is performed on the displayed image.
As a result, the jaggedness of the image generated at the time of interlace driving is blurred by the data of adjacent pixels above and below, and the contour of the image is displayed smoothly, thereby suppressing the image quality deterioration at the time of interlace driving.

[2] In the liquid crystal display driving apparatus according to one aspect of the present invention, the drive control unit is configured so that the other field adjacent above and below the scanning line of the one field is within the driving time of the scanning line of the one field. The scanning lines are driven with a time width shorter than the driving time.
Here, in order to drive the non-driving scanning line within the driving time of the driving scanning line with a time width shorter than the driving time, the pixel data supplied to each display element of the driving scanning line and the display element are adjacent to each other. The pixel data in the display element of the non-drive scanning line to be synthesized is synthesized by the ratio of the drive time and the time width, and as a result, a process of passing through the low-pass filter is performed, and the contour of the image generated at the time of interlace drive It is possible to blur the jagged edges and display the contours more smoothly.

[3] In the liquid crystal display driving device according to one aspect of the present invention, the drive control unit synchronizes with the timing of driving the scanning line of the one field, and the other of the other adjacent to the scanning line of the one field. The scanning line of the field is driven, and the driving of the scanning line of the other field is stopped in a time width shorter than the driving time of the scanning line of the one field.
Here, in order to start up the non-driving scanning line in synchronization with the driving scanning line, it is only necessary to control the time width for driving the non-driving scanning line. Therefore, a circuit for driving the non-driving scanning line is provided. Can be ready.

[4] In the liquid crystal display driving device according to one aspect of the present invention, the drive control unit may scan the scanning line of the other field on both sides adjacent to the upper and lower sides of the scanning line driven in the one field. The scanning line is driven with a shorter time width than the driving time of the scanning line.
Here, by driving both the upper and lower non-driving scanning lines adjacent to the driving scanning line corresponding to the driving scanning line, as compared with the case of driving only one of the upper and lower non-driving scanning lines, The pixel data of the display pixel corresponding to the non-driving scanning line is combined with the pixel data of two adjacent driving scanning lines, and the blurring effect by the low-pass filter processing can be increased.

  According to the present invention, the pixel data of the display element corresponding to the drive scanning line to be driven is used to convert the non-drive scanning lines that are not driven in different fields adjacent to the upper and lower sides of the display element of the driving scanning line. In order to drive in a shorter time than the driving time of the image, the low-pass filter processing in the vertical direction is performed on the displayed image, and the pixel data of the display elements adjacent to the top and bottom of the jaggedness of the image generated during interlace driving By blurring the display, it is possible to suppress image quality degradation during interlace driving.

It is a conceptual diagram of the display screen in the liquid crystal display explaining the outline | summary of this invention. It is a conceptual diagram of the display screen in the liquid crystal display explaining the outline | summary of this invention. It is a conceptual diagram which shows the structure of the display element in a liquid crystal display. It is a block diagram which shows the structural example of the liquid crystal display drive device by one Embodiment of this invention. It is a conceptual diagram which shows arrangement | positioning of the display element in the liquid crystal display 200 in FIG. It is a timing chart explaining the drive of the scanning line in interlace drive. It is a wave form diagram explaining the drive of the scanning line at the time of the interlace drive in this embodiment. 6 is a timing chart for explaining the operation of the scanning line driving unit 5 in the present embodiment. It is a conceptual diagram of the display screen in the liquid crystal display explaining the display process by this embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
First, in order to facilitate understanding in explaining processing of a display image in interlace driving according to the present invention, an outline of image quality degradation that occurs when interlace driving is performed on a liquid crystal display will be described. In interlaced driving, groups are divided into an odd field consisting of odd-numbered and odd-numbered scanning lines and an even-numbered field consisting of even-numbered lines on the display screen, and the scanning lines of each group are driven in order.

  FIG. 1 shows an image of a white image pattern (height N pixels, width M pixels) arranged on a black background. A case will be considered below where this white image moves by S pixels in one frame in the x-axis direction. FIG. 2 shows a state at the time when the even field is completed, and only the image data of the display element corresponding to the even scanning line driven in the even field is changed. On the other hand, the display element corresponding to the odd scanning line scanned in the odd field displays the image data in the immediately preceding frame.

  In order to indicate pixel data in each display element, the position of the display element (corresponding to the pixel on the display screen) on the display screen is indicated by (i (scan line row number), j (data line column number)), and the frame number If t is t, the image data of the white image pattern is “1”, and the black background image data is “0”, the image data of each display element can be expressed by the following equation (1). In the following equation (1), (N0, M0) is the coordinates of the upper left point in the white image pattern at t = 0. Here, i is the row position, and j is the column position. The position coordinates of the display element are set by the i row (corresponding to the coordinates of the scanning line) and the j column (coordinates of the data line). .

Equation (1) assumes that in the case of progressive driving, the scanning lines are driven sequentially from the top of the screen.
However, in the case of interlace driving, the pixel data of the display element having the even number and the row number i is rewritten when t is an even number, while the odd number field and the row number i is changed when t is an odd number. Since the pixel data of the odd display element is rewritten, the pixel data of each display element can be expressed by the following equation (2).

If interlace is used, pixel data that can be transmitted in a period of one field is halved compared to one frame. Therefore, when the same number of display elements are driven in each field, the time of one field The width can be shortened to half of one frame, that is, it can correspond to a frame frequency twice that of progressive (actually a field frequency), which is suitable for reproduction of a moving image.
However, when the liquid crystal display is driven by interlaced driving, the display element in the row corresponding to the scanning line that is not driven holds and displays the pixel data in the immediately preceding frame, so that a white image is displayed as shown in FIG. In the contour of the pattern, the left end and the right end are jagged, which causes image quality deterioration.

FIG. 2 is a conceptual diagram showing a case where scanning lines corresponding to an even field and an odd field are driven in order in a frame. Driving of the scanning lines of the even field is finished and driving of the scanning lines of the odd field is started. It is a conceptual diagram which shows the state of the display image before being performed.
In this way, when interlaced display is performed on a liquid crystal display, since it corresponds to the fast movement of the displayed image pattern, the blur due to the jaggedness of the contour of each image pattern of the moving image is reduced and observed. However, the overall image quality itself is not improved.

In the present embodiment, the jaggedness at the left end and right end in the contour of the image pattern is suppressed, and the image quality of the entire display image is improved. In order to facilitate understanding of driving in the embodiment of the present invention, driving of a display element in a liquid crystal display will be described below.
In a liquid crystal display, display elements are arranged in a matrix corresponding to scanning lines and data lines. A display element shown in FIG. 3 is arranged to correspond to one pixel of the liquid crystal, that is, to drive one liquid crystal element. FIG. 3 is a conceptual diagram showing the configuration of the display element. Pixel data input to the data line (j) is transferred to the capacitor C _D signal level holding performing holding the signal level of the pixel data (voltage level corresponding to e.g. grayscales of pixel data) via the switch SW It is held in the capacitor C _D signal level holding.

Here, when the scanning line (i) as the selection signal line is driven and is turned on (a state in which the switch SW is selected), the switch SW holds the pixel data input to the data line (j) at the signal level. output to use capacitor C _D, the scanning line (i) is being in the off state is the non-driving, does not output the pixel data input to the data line (j) to the capacitor C _D signal level holding. Here, for example, a TFT (Thin Film Transistor) is used for the switch SW. Then, the pixel drive circuit DR will drive the liquid crystal element by the voltage level held in the capacitor C _D signal level holding.

As described above, in order to change the display state of the liquid crystal element, it is necessary to change the voltage level of the pixel data held in the capacitor C _D signal level holding.
For rewriting the pixel data held in the capacitor C _D signal level holding, i.e. for changing the electrification amount of the signal level that is stored, it is necessary to process flush out or current flowing a current. Therefore, the amount of current to flow out or poured through the switch SW, the voltage level of the capacitor C _D signal level held for a time sufficient to reach the voltage level of the pixel data in the data line (usually a few μ s) In addition, the switch SW needs to be in an ON state, that is, the scanning line needs to be driven (in a driving state). A time width as a drive time of a pixel selection signal described later is set corresponding to the sufficient time.

Next, a liquid crystal display driving apparatus according to this embodiment for driving the above-described liquid crystal display will be described with reference to FIG. FIG. 4 is a block diagram illustrating a configuration example of the liquid crystal display driving device 100 according to the present embodiment.
The liquid crystal display driving device 100 includes a pixel data input unit 1, buffers 2 and 3, an image processing unit 4, a scanning line driving unit 5, and an image data holding unit 6.
Each of the buffers 2 and 3 is a line memory that accumulates pixel data corresponding to one scanning line. Here, when the pixel data is read from either the buffer 2 or the buffer 3, the pixel data is written to the other.
The pixel data input unit 1 inputs pixel data to be displayed on the liquid crystal display 200 from an external device, and sequentially inputs the data to the buffer 2 and the buffer 3 every time the number of pixels corresponding to one scanning line is input. Write data.

When the detection signal in which the number of pixels corresponding to one scanning line (i) is input from the pixel data input unit 1, the image processing unit 4 reads the pixel data from the buffer where the writing has been completed, The read data is written to the data holding unit 6. The image processing unit 4 outputs an end signal to the scanning line driving unit 5 when writing to the buffer is completed.
Accordingly, the pixel data holding unit 6 holds the pixel data corresponding to the number of display elements corresponding to one scanning line (i).
The pixel data holding unit 6 outputs pixel data input in series from either the buffer 2 or the buffer 3 in parallel to each data line (j) of the liquid crystal display 200.

Each time the end signal is input, the scanning line driving unit 5 drives the even-numbered scanning lines (i) of the liquid crystal display 200 one by one in order from the top of the display screen in the case of an even field. In the case of the field, the odd-numbered scanning lines of the liquid crystal display 200 are driven one by one in order from the top of the display screen. Thereby, the pixel data input to the data line (j) connected to the display element is displayed on each display element of the corresponding scanning line.
Further, the scanning line driving unit 5 performs the first end of each field in the next end signal after the processing of the last scanning line (i) of each display screen is completed in both the even field and the odd field. Returning to the scanning line (i), the above process is repeated.

Next, the configuration of the liquid crystal display 200 driven by the liquid crystal display driving device will be described with reference to FIG. FIG. 5 is a conceptual diagram for explaining the arrangement of display elements in the liquid crystal display 200.
In the liquid crystal display, scanning lines and data lines are arranged in a grid pattern, and the above-described display elements (including liquid crystal elements) are arranged one by one in a pixel unit at a grid point.
FIG. 5 shows that the data lines D ₀ , D ₁ , D ₂ , D ₃ ,..., D _i ,... Are arranged in parallel in the column direction (x-axis direction) of the display elements, and the display elements are arranged in the row direction. A conceptual diagram of a liquid crystal display in which scanning lines L ₀ , L ₁ , L ₂ , L ₃ ,..., L _j,. In this figure 4, to the liquid crystal display, the pixel data of the video signal supplied to the capacitor C _D for signal level holding the display elements extends vertically in FIG from the image processing device (not shown) (y-axis direction) each A scanning line that supplies a pixel selection signal that is supplied to the data line and that performs on / off control of the switch SW of each display element extending in the horizontal direction (x-axis direction) is arranged. The coordinates of the display element (i, j) are given to each display element. Here, as already described, i represents the coordinate on the y-axis, and j represents the coordinate on the x-axis.

5, the data line 1 column (data line _{D 0),} the display device (0,0), (1,0), (2,0), (3,0), ... with respect to the signal level holding transmitting pixel data to be held in the use capacitor C _D. On the other hand, the first scanning line (scanning line L ₀ ) turns on the switch SW in the display element for the display elements (0, 0), (0, 1), (0, 2), (0, 3),. A pixel selection signal for controlling / OFF driving, that is, writing pixel data to the display element is transmitted. This pixel selection signal is output from the scanning line driving unit 5 to each scanning line.

Hereinafter, an operation example of the data line D ₀ and the scanning lines L ₀ , L ₁ , L ₂ ,... During interlace driving will be described with reference to FIG. 6 taking the first line of data lines (data line D ₀ ) as an example. . 6, the data lines _{D 0} at the time of interlace driving, the scanning lines _{L 0, L 1, L 2} , a timing chart showing ... and the vertical axis scanning lines _{L 0, L 1, L 2} , ... a signal level, indicates the pixel data of the data lines D _0, the horizontal axis represents time.
In interlaced display, the scanning signal on the display screen is every other line from the top, that is, in the even field, the image data holding unit for the display elements corresponding to the even-numbered scanning lines (L ₀ , L ₂ ,...). The pixel data is input from the image data holding unit 6 to the display elements corresponding to the odd-numbered scanning lines (L ₁ , L ₃ ,...) In the odd field.

Thus, for example, in the odd field, at the time when the scan line driver 5 drives the scan lines L _1, and the pixel data of the display device (1,0) is input to the data line D _0, the scan line driver When 5 scans the scanning line L ₃ , the pixel data of the display element (3, 0) is input to the data line D ₀ , and when the scanning line drive unit 5 drives the scanning line L ₅ , the display is performed. pixel data elements (5,0) are inputted from the pixel data holding unit 6 to the data line D _0. As described above, in each field, pixel data of the display elements corresponding to the even-numbered or odd-numbered scanning lines are input corresponding to the driving order of these scanning lines. In the figure, the scanning line is driven when the pixel selection signal is at the H level, and the non-driving state when the pixel selection signal is at the L level.
As described above, the scanning line driving unit 5 responds by the control of the image processing unit 4 in synchronization with the timing when the pixel data is input from the image data holding unit 6 to the data line D ₀ (all data lines). The scanning line to be driven is driven.

For example, when the pixel data to be displayed from the image data holding unit 6 to the display device (1,0) is input to the data line D _0, the scan line driver 5 drives the scan lines L _1. By scanning line L ₁ is driven, the pixel switch SW changes from OFF (non-conductive state) on (conducting state), the data line D ₀ in the capacitor C _D signal level holding the display device (1,0) The data signal level is accumulated, and the liquid crystal element is controlled by the signal drive level via the pixel driving circuit DR.
As described above, in interlaced driving, display control is performed by dividing the scanning lines of the display screen into two even-numbered fields and odd-numbered fields, so that display control is performed for half of one frame in each field period.

Then, the signal level of the pixel data to be displayed on the display device (1,0) is explained by FIG. 7 the state stored in the capacitor C _D for the signal level holding. FIG. 7 is a waveform diagram for explaining scanning line driving in this embodiment, where the vertical axis represents the signal level and the horizontal axis represents time. In this figure, the scanning line L ₁ is driven by the scanning line driving unit 5 in synchronization with the timing when the pixel data of the signal level E (t) is input from the image data holding unit 6 to the data line D ₀ (time). The case is shown in (odd field of t). Here, a case where the signal level E (t-2) is held in the capacitor C _D signal level holding previous (odd field time t-2). Here, time t-2 indicates the time two fields before the time t field.

By scanning line _{L 1} is driven in FIG. 7 (b), the switch SW is turned on, as shown in FIG. 7 (a), held in the capacitor _{C D} signal level holding the display element (1,0) the signal level is gradually changed from E (t-2) to E (t), to become final signal level E, which is input to the current data line D ₀ (t). Until time t + 2 in the odd field next scanline L ₁ is driven, the signal level E (t) is to be held in the capacitor C _D signal level holding the display element (1,0). Time t + 2 indicates a time two fields after the time t field. As described above, by the switch SW is turned on, the signal level is accumulated in the capacitor C _D signal level held, the held have signal level, the signal level that is newly supplied from the data line D ₀ Will change.

Here, in the present embodiment, as shown in FIG. 8, the scanning line driving unit 5 applies pixels to the scanning line to be driven with respect to scanning lines adjacent to the top and bottom of the scanning line that is driven to display pixel data. compared to the time width of the selection signal (time width required to change the signal level stored on the capacitor C _D signal level holding), short (e.g., on the order of half the time width of the pixel selection signal) the time width The pseudo pixel selection signal is output. Here, FIG. 8 is a timing chart for explaining the operation of the scanning line driving unit 5 in the present embodiment.
That is, the scan line driver 5, the case of driving by outputting a pixel selection signal to the scanning line L ₁ of the odd field, and outputs a pseudo pixel selection signal to the scanning lines L ₁ and L ₂ of the even field .

For example, the scan line driver 5 outputs a pixel selection signal to the scanning line L _1, the scanning line L ₀ and L ₂ adjacent to the scanning line L _1, the scanning line shown in FIG. 7 (b) L Compared with the pixel selection signal given to ₁ , a pseudo pixel selection signal having a short time width shown in FIG.
Thus, in the field of time t, as shown in FIG. 7 (c), for example, to the connected display element scan line _{L 2} (2, 0), the voltage level of the display device (1,0) E (t) is supplied, the signal point of the field time t-2 stored in the capacitor C _D signal level holding level E (t-2) is, corresponding to the time width of the pseudo pixel selection signal level Change minutes. That is, since the time width of the pseudo pixel selection signal is less than the time width necessary for changing the signal level stored in the signal level holding capacitor _CD , the signal level at time t cannot be reached. , so that the value between the respective signal levels of the time t-2 and t is held in the capacitor C _D signal level holding. This signal processing is the same processing as a low-pass filter that smooths the left and right edges of a jagged image pattern.

That is, as shown in FIG. 5, when only the scanning lines of each field are processed, each scanning line is driven and the image data of the display element is rewritten for each field. For this reason, the display elements of the fields that are not to be rewritten display the same image data for two fields, so that the left and right edges of the image pattern are jagged as shown in FIG. Will fall.
On the other hand, as shown in FIG. 8, the scanning line driving unit 5 outputs a pixel selection signal to the scanning line to be driven, and the time width of the pixel selection signal with respect to the scanning lines adjacent above and below the scanning line to be driven. The image quality can be improved by outputting a pixel selection signal having a shorter width than the pixel selection signal.

Here, consider a case where the white image pattern in FIG. 1 is moved by S pixels in the x-axis direction in the even field. At this time, as shown in FIG. 9, when a pixel selection signal is output to the scanning line L _{2i + 2} by the scanning line driving unit 5, the scanning line L _{2i + 1} and the scanning line L _{2i + 3} adjacent to the scanning line L _{2i + 2} are output. pseudo pixel selection signal is output Te, display device pixel data display element (2i + 2, j) ( 2i + 1, j) and the display element (2i + 3, j) the capacitor C _D for each of the signal level storage Will be given to. FIG. 9 is a conceptual diagram of a display screen in the liquid crystal display for explaining display processing according to the present embodiment.
Further, by the scanning line driving unit 5, when the pixel selection signal is output to the scanning line L _{2i + 4,} the pseudo pixel selection signal is output to the scanning line L _{2i + 3} and the scanning line L _{2i + 5} adjacent to the scanning line L _{2i + 4} , pixel data of the display element (2i + 4, j) is, would be given to the display device (2i + 3, j) and the display element (2i + 5, j) capacitor C _D for each of the signal level storage.

Thus, the signal level of the signal level storage capacitor C _D of the display element corresponding to the field of the scanning line is not a drive target, value close to the signal level of the pixel data corresponding to the scanning line to be driven adjacent to the scanning line Therefore, the result is the same as the result of image processing by the low-pass filter using the pixel data of the upper and lower display elements. Here, a display element connected to the same data line (j) as the display element to which the pixel selection signal is input and a signal level holding capacitor for the display element selected by the pseudo pixel selection signal pixel data is applied to change the signal level of C _D.
Even if the outlined image pattern in FIG. 1 is moved in the same manner as in FIG. 2 by the above-described low-pass filter processing, the jaggedness at the left and right ends of the figure is as shown in FIG. 9 compared to the display image in FIG. The image quality is visually improved by blurring, image quality deterioration in interlaced display on the liquid crystal display is reduced, the image quality is improved, and the display image can be quickly moved.

  Further, a program for realizing the functions of the image processing unit 4 and the scanning line driving unit 5 in FIG. 4 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read by a computer system, The drive control of the liquid crystal display may be performed by executing. The “computer system” here includes an OS and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage device such as a hard disk built in the computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within a scope not departing from the gist of the present invention.

1 ... pixel data input portion 2, 3 ... buffer 4 ... image processing unit 5 ... scanning line driver 6 ... pixel data holding unit 100 ... liquid crystal display driving system 200 ... liquid crystal display _{D 0, D 1, D 2} , D 3 ... Data lines L ₀ , L ₁ , L ₂ , L ₃ ... Scanning line DR... Pixel drive circuit SW.

Claims (4)

An interlaced display in which one frame of a liquid crystal display is grouped into an odd field consisting of odd-numbered odd scanning lines and an even field consisting of even-numbered lines on the display screen, and images are displayed in the order of the scanning lines of each group. A liquid crystal display driving device for driving the liquid crystal display by a method;
A buffer that accumulates pixel data of the input image by the number of display elements in the scanning line;
A pixel data output unit for outputting each pixel data stored in the buffer in correspondence with a data line of the display element in a liquid crystal display;
A scanning line driving unit that sequentially drives each scanning line in the odd field or even field unit;
An image processing unit that drives the scanning line to the scanning line driving unit after transferring the pixel data accumulated in the buffer to a pixel data control unit, and
When one of the even field and the odd field is a driving target, the scanning line driving unit selects the scanning line of the other field adjacent to the scanning line sequentially driven in the one field. A liquid crystal display driving device which is driven with a short time width with respect to the driving time of one scanning line.   The scanning line driving unit moves the scanning line of the other field adjacent to the scanning line of the one field within a driving time of the scanning line of the one field with a shorter time width than the driving time. The liquid crystal display driving device according to claim 1, wherein the liquid crystal display driving device is driven.   The scanning line driving unit drives the scanning line of the other field adjacent to the scanning line of the one field in synchronization with the timing of driving the scanning line of the one field, and scans the one field. 3. The liquid crystal display driving device according to claim 2, wherein the driving of the scanning line of the other field is stopped in a short time width with respect to the driving time of the line.   The scanning line driving unit drives the scanning line of the other field on both sides adjacent to the upper and lower sides of the scanning line driven in one field with a short time width with respect to the driving time of the scanning line of the one field. The liquid crystal display driving device according to claim 1, wherein the liquid crystal display driving device is a liquid crystal display driving device.

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