JP2003084730A - Liquid crystal display device, liquid crystal display method, program, and medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a luminance difference between a black display in an effective display region and a black display in an invalid display region in the case where image signals having the number of effective display scanning lines fewer than the number of display ability scanning lines of a liquid crystal panel are inputted. SOLUTION: This liquid crystal display device has a circuit 14 for identifying the number of the scanning lines for detecting the number of the scanning signal lines to be utilized for displaying the image data signals to the liquid crystal panel 11 and a circuit 15 for varying scanning speeds which performs the control to (a) display the image data in the effective display region disposed at the liquid crystal panel 11 and to (b) display the prescribed data in the invalid display region disposed at the liquid crystal panel 11 when the detected number of the lines is fewer than the total number of the scanning signal lines, and the circuit 15 for varying the scanning speeds performs the control substantially continuously to change the pulse width of the scanning clock signals for scanning the scanning signal lines.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a liquid crystal display method used when it is necessary to change the aspect ratio of a screen depending on an image signal displayed on a display such as a television or a personal computer. Regarding programs and media.

[0002]

2. Description of the Related Art As a conventional liquid crystal display device, for example, one described in JP-A-10-187105 is known.

In such a conventional liquid crystal display device, when an image signal of m effective display scanning lines, which is smaller than the display capacity scanning line number n of the liquid crystal panel, is input, as shown in FIG. Liquid crystal panel 61 with display capability of n lines
Is connected to a signal line driving circuit 62 for driving the signal lines of the liquid crystal panel 61 and a scanning line driving circuit 63 for driving the scanning lines of the liquid crystal panel 61 to identify the number of effective display scanning lines of the input image signal. The scanning line number identifying circuit 64 and a high-speed scanning control circuit 65 that activates high-speed scanning of the liquid crystal panel 61 and controls the output of the signal line driving circuit 62 to display black during the blanking period of the image signal. It is configured.

FIG. 7 is a waveform diagram showing the operation of the conventional liquid crystal display device. Reference numeral 71 is an image signal input to the signal line drive circuit 62 including an image valid period 72 and blanking period 73, and 74 is input to the scan line drive circuit 63 including a normal scan pulse portion 75 and a high speed scan pulse portion 76. Scan clock pulse signal.

The operation of the conventional liquid crystal display device configured as described above will be described.

When an image signal having m display data with the number of scanning lines is less than n is input to the liquid crystal panel 61 having the display capability of n scanning lines, the liquid crystal panel display area diagram of FIG. On the liquid crystal panel 11, the invalid display areas 32 of the number of scanning lines (nm) other than the effective display area 31 of the number of scanning lines m are normally displayed in black or the like as shown in FIG. In the display device such as the liquid crystal panel 11, it is necessary to drive with a black display signal.

Generally, the blanking period of an image signal is
Since it is shorter than the period for scanning the number of scanning lines (nm),
Scanning line-sequentially at standard scanning speed and displaying black,
The image signal of the next frame is input before the scanning for one frame is completed, and normal display cannot be performed.

Therefore, the scanning line number identification circuit 6 in FIG.
When 4 identifies the input of the image signal having the display data of m in which the number of scanning lines is less than n, the high speed scanning control circuit 65 causes the scanning clock signal in the blanking period 73 of the image signal 71 in FIG. The cycle of 74 is switched at high speed, and the so-called upper and lower invalid display areas are simultaneously scanned to complete the scanning of all the scanning lines before the image signal of the next frame is input.

[0009]

However, in the above-mentioned conventional liquid crystal display device, there is a difference in brightness between black displayed in the effective display area and that displayed in the invalid display area.

In consideration of the above conventional problems, the present invention provides an effective display area in the case where an image signal having an effective display scanning line number smaller than the display capacity scanning line number of the liquid crystal panel is input. It is an object of the present invention to provide a liquid crystal display device, a liquid crystal display method, a program, and a medium capable of making a difference in brightness between the black display and the black display of an invalid display area inconspicuous.

[0011]

[Means for Solving the Problems] The first invention (Claim 1)
Corresponds to the detection means for detecting the number of scanning signal lines to be used for displaying the image data signal input from the outside on the liquid crystal panel, and the detected number is the total number of scanning signal lines. And (b) display the image data in an effective display area provided on the liquid crystal panel to be used for displaying the image data, and (b) display the image data on the liquid crystal panel. And a control means for performing control for displaying predetermined data in an invalid display area which is not used for displaying, the control means scans the scanning signal line in all or part of the invalid display area. Is a liquid crystal display device that controls the pulse width of the scanning clock signal to change substantially continuously.

In a second aspect of the present invention (corresponding to claim 2), the control for changing the pulse width of the scanning clock signal for scanning the scanning signal line substantially continuously is performed by the effective display of the pulse width. It is the liquid crystal display device according to the first aspect of the present invention, which is performed so as to decrease from the side close to the area toward the inside of the invalid display area.

A third aspect of the present invention (corresponding to claim 3) is a detecting means for detecting the number of scanning signal lines to be used for displaying an image data signal input from the outside on a liquid crystal panel, When the detected number is smaller than the total number of the scanning signal lines, (a) display the image data in an effective display area which is provided in the center of the liquid crystal panel and should be used for displaying the image data. (B) control means for controlling display of predetermined data in two invalid display areas that are not used for displaying the image data provided above and below the liquid crystal panel, respectively, and the control means A control for substantially continuously changing the pulse width of a scan clock signal for scanning the scan signal line in all or a part of at least one invalid display area of the two invalid display areas. Is a liquid crystal display device that performs.

In a fourth aspect of the present invention (corresponding to claim 4), the control for changing the pulse width of the scanning clock signal for scanning the scanning signal line substantially continuously is performed by the effective display of the pulse width. It is the liquid crystal display device according to the third aspect of the present invention, which is performed so as to decrease from the side close to the area toward the inside of the invalid display area.

In a fifth aspect of the present invention (corresponding to claim 5), the scanning of the scanning signal line in the invalid display area is performed by utilizing the blanking period of the image data signal input from the outside. The liquid crystal display device according to the third aspect of the present invention is performed simultaneously in the invalid display area.

In a sixth aspect of the present invention (corresponding to claim 6), the pulse width of the scanning clock signal for scanning the scanning signal line in the effective display region is such that the scanning signal line in the invalid display region is scanned. The liquid crystal display device according to the first or third aspect of the present invention has a pulse width larger than the pulse width of the scanning clock signal.

In the seventh aspect of the present invention (corresponding to claim 7), the control for displaying predetermined data in the invalid display area is to write data for performing black display in the invalid display area. The liquid crystal display device according to the first or third aspect of the present invention is a control.

According to an eighth aspect of the present invention (corresponding to claim 8), the step of detecting the number of scanning signal lines to be used for displaying an image data signal input from the outside on a liquid crystal panel, When the number of scanning signal lines is smaller than the total number of scanning signal lines, (a) the image data is displayed in an effective display area which is provided in the liquid crystal panel and should be used for displaying the image data, and (b) the above And a step of performing control for displaying predetermined data in an invalid display area that is not used for displaying the image data provided on the liquid crystal panel,
The control is a liquid crystal display method in which the pulse width of the scan clock signal for scanning the scan signal line is substantially continuously changed in all or part of the invalid display area.

According to a ninth aspect of the present invention (corresponding to claim 9), a step for detecting the number of scanning signal lines to be used for displaying an image data signal input from the outside on a liquid crystal panel, and the detection. When the number of the scanned lines is less than the total number of the scanning signal lines, (a) the image data is displayed in an effective display area that is provided in the center of the liquid crystal panel and should be used for displaying the image data, (B) a step of performing control for displaying predetermined data in two invalid display areas that are not used for displaying the image data provided above and below the liquid crystal panel, respectively. In all or a part of at least one invalid display area of the two invalid display areas, a pulse width of a scan clock signal for scanning the scan signal line is changed substantially continuously. It is a liquid crystal display method.

The tenth invention (corresponding to claim 10) of the eighth aspect of the liquid crystal display method according to the eighth invention relates to a scanning signal line to be used for displaying an image data signal input from the outside on a liquid crystal panel. The step of detecting the number of lines, and (a) if the number of lines detected is less than the total number of the scanning signal lines.
Displaying the image data in an effective display area to be used for displaying the image data provided in the liquid crystal panel,
(B) A program for causing a computer to execute all or a part of the step of performing control for displaying predetermined data in an invalid display area which is not used for displaying the image data provided on the liquid crystal panel. is there.

The eleventh invention (corresponding to claim 11) is
In the liquid crystal display method according to the ninth aspect of the present invention, a step for detecting the number of scanning signal lines to be used for displaying an image data signal input from the outside on the liquid crystal panel; When the number of signal lines is less than the total number of signal lines, (a) the image data is displayed in an effective display area which is provided in the center of the liquid crystal panel and should be used for displaying the image data, and (b) the liquid crystal panel. Is a program for causing a computer to execute all or a part of a step of performing control for displaying predetermined data in two invalid display areas which are not used for displaying the image data provided above and below respectively. .

The twelfth aspect of the present invention (corresponding to claim 12) is
In the liquid crystal display method of the eighth invention, a step of detecting the number of scanning signal lines to be used for displaying an image data signal inputted from the outside on the liquid crystal panel, and the detected number is the scanning signal line. If the total number is less than
(A) The image data is displayed in an effective display area provided on the liquid crystal panel and should be used for displaying the image data, and (b) Not used for displaying the image data provided on the liquid crystal panel Invalid It is a medium that carries a program for causing a computer to execute all or part of the step of performing control for displaying predetermined data in the display area, and is a medium that can be processed by the computer.

The thirteenth invention (corresponding to claim 13) is
In the liquid crystal display method according to the ninth aspect of the present invention, a step for detecting the number of scanning signal lines to be used for displaying an image data signal input from the outside on the liquid crystal panel; When the number of signal lines is less than the total number of signal lines, (a) the image data is displayed in an effective display area which is provided in the center of the liquid crystal panel and should be used for displaying the image data, and (b) the liquid crystal panel. A program for causing a computer to execute all or part of a step of performing control for displaying predetermined data in two invalid display areas that are not used for displaying the image data provided above and below respectively It is a computer-readable medium that can be processed by a computer.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) First, the configuration of the liquid crystal display device according to the present embodiment will be described with reference to FIGS.

1 is a block diagram of a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a waveform diagram showing the operation of the liquid crystal display device shown in FIG. 1, and FIG. 3 is an image input to the liquid crystal display device. FIG. 9 is a liquid crystal panel display area diagram showing a state in which the number of effective display scanning lines of a signal is smaller than the number of display capability scanning lines of the liquid crystal panel.

In FIG. 1, 11 is a liquid crystal panel having a display capability of n scanning lines, 12 is a signal line driving circuit for driving the signal lines of the liquid crystal panel 11, and 13 is scanning for driving the scanning lines of the liquid crystal panel 11. A line driving circuit, 14 is a scanning line number identifying circuit (detecting means) for identifying the number of effective display scanning lines of an input image signal, and 15 is a scanning line driving circuit 13 by varying the scanning speed in several steps or continuously. And a scanning speed variable circuit (control means) that controls the output of the signal line drive circuit 12 to display black at the same time.

In FIG. 2, reference numeral 21 denotes the number of effective display scanning lines consisting of the image effective period 22 and the blanking period 23.
(<N) image signals input to the signal line drive circuit 12, 24 is a scan clock pulse signal (scan clock) input to the scan line drive circuit 13 including a normal scan pulse portion 25 and a scan pulse variable portion 26. Signal).

In FIG. 3, reference numeral 31 is an effective display area for displaying image data input on the liquid crystal panel 11, and 32 is an invalid display area.

Next, the operation of the liquid crystal display device according to the present embodiment will be described mainly with reference to FIGS. 4 to 5 (while the operation of the liquid crystal display device according to the present embodiment will be described, the liquid crystal display of the present invention will be described. An embodiment of the method is also described).

FIG. 4 is a characteristic diagram of a voltage written in one liquid crystal element over time, and FIG. 5 is a transmittance characteristic diagram of the liquid crystal element with respect to an applied voltage.

When an image signal 21 of m effective display scanning lines, which is smaller than the display capacity scanning line number n of the liquid crystal panel 11, is input, the scanning line number identifying circuit 14 causes the effective display scanning lines to be n lines. Since the number of lines is smaller than m, the next scanning speed variable circuit 15 is activated. Scanning speed variable circuit 1
5, in the blanking period 23 of the image signal 21, the scanning speed in the (nm) invalid display regions 32 is changed stepwise or continuously, and the following scanning is performed by simultaneous scanning of the upper and lower invalid display regions. The scanning of all the scanning lines is completed before the image signal of the frame is input. At the same time, the output of the signal line drive circuit 12 is controlled to display black.

Here, as shown in FIG. 2, when the image signal 21 is switched from the image effective period 22 to the blanking period 23, the scanning speed is changed from the normal scanning pulse stepwise or continuously. When the image signal 21 is switched to the high-speed scanning pulse and the image signal 21 is switched from the blanking period 23 to the image effective period 22, the high-speed scanning pulse is controlled to be changed stepwise or continuously to the normal scanning pulse.

That is, in the present embodiment, since the upper and lower invalid display areas are simultaneously scanned as described above, such control is performed so that the pulse width is (1) the invalid display area from the side closer to the effective display area. Decrease toward the inside of (2)
The increase is performed from the middle side of the invalid display area to the side farther from the effective display area.

Now, when the time for writing the signal voltage to the liquid crystal element is shortened, the liquid crystal element has the characteristics shown in FIG. 4 with respect to the time change of the voltage written in the liquid crystal element. It will not reach the signal voltage.

Then, from the transmittance characteristic diagram of the liquid crystal element with respect to the applied voltage shown in FIG. 5, it can be seen that the transmittance becomes higher than 0%. From this, by reducing the pulse width of the scanning clock signal (that is, by switching the period of the scanning clock signal to a high speed) as in the conventional case, the scanning speed is uniformly increased and the black display in the effective display area 31 is performed. If it is performed (see FIG. 7), it is analyzed that a brightness difference will occur between black display in the invalid display area 32.

In the present embodiment, in order to suppress such a phenomenon, the scanning speed variable circuit 15 steps the scanning speed for adjusting the time for writing the signal voltage to the liquid crystal element during the blanking period. (Or continuously) (see FIG. 2) to control the output of the scanning line drive circuit 13.

Then, the scanning speed variable circuit 15 controls the output of the signal line drive circuit 12 so that black display is performed. As a matter of course, such output control of the signal line drive circuit 12 can be performed even if the liquid crystal panel 11 is (1) a normally white type in which white display is performed with no voltage applied, (2) black is applied with no voltage applied. It is effective even if the display is a normally black type (even when the liquid crystal panel 11 is a normally black type, by positively performing output control for realizing no voltage applied state, It is possible to make the brightness difference between the black display of the effective display area 31 and the black display of the invalid display area 32 less noticeable.) Thus, the above-mentioned brightness change is not changed so that it cannot be detected by human eyes. The black display of the valid display area 31 and the invalid display area 32
It is possible to make the difference in brightness from that of black display inconspicuous.

In the above, the first embodiment has been described in detail.

The control for substantially continuously changing the pulse width of the scanning clock signal for scanning the scanning signal line according to the present invention is such that the pulse width is (1) in the above-described embodiment. The decrease was performed from the side closer to the effective display area toward the inside of the invalid display area, and (2) the increase was performed from the inside of the invalid display area toward the side farther from the effective display area. However, the control for changing the pulse width of the scanning clock signal for scanning the scanning signal line substantially continuously is not limited to this. For example, the pulse width is invalidly displayed from the side close to the effective display area. The pulse width may be decreased toward the center of the area (the pulse width may be decreased toward the side away from the effective display area from the inside of the invalid display area).

Further, in the above-described embodiment, the control means of the present invention substantially continuously changes the pulse width of the scanning clock signal for scanning the scanning signal line in the entire invalid display area. Although the control is performed, the control is not limited to this, and the pulse width of the scanning clock signal for scanning the scanning signal line may be controlled to be substantially continuously changed in a part of the invalid display area.

In short, according to the present invention, the detecting means for detecting the number of scanning signal lines to be used for displaying the image data signal input from the outside on the liquid crystal panel, and the detected number of scanning signal lines are the scanning signal lines. If less than the total number,
(A) The image data is displayed in the valid display area provided on the liquid crystal panel and should be used for displaying the image data, and (b) The predetermined data is displayed in the invalid display area which is not used for displaying the image data provided on the liquid crystal panel. A control means for performing control for displaying data, wherein the control means substantially continuously changes the pulse width of the scanning clock signal for scanning the scanning signal line in all or part of the invalid display area. This is a liquid crystal display device that performs control so that it may be any number of invalid display areas.

Of course, the detecting means for detecting the number of scanning signal lines to be used for displaying the image data signal input from the outside on the liquid crystal panel, and the detected number are more than the total number of scanning signal lines. When the number is small, (a) the image data is displayed in an effective display area provided in the center of the liquid crystal panel and should be used for displaying the image data, and (b) the image data is displayed respectively above and below the liquid crystal panel. And a control means for performing control for displaying predetermined data in two invalid display areas that are not used for, the control means is the whole or a part of the invalid display area of at least one of the two invalid display areas. In the present invention, a liquid crystal display device that controls the pulse width of the scan clock signal for scanning the scan signal line to be substantially continuously changed is also included in the present invention.

The invention is a program for causing a computer to execute the functions of all or part of the above-mentioned liquid crystal display device of the present invention (or devices, elements, circuits, sections, etc.). It is a program that works in cooperation with. Of course, the computer of the present invention is not limited to pure hardware such as a CPU, but may include firmware, OS, and peripheral devices.

Further, the present invention is a program for causing a computer to execute all or some of the steps (or steps, operations, actions, etc.) of the above-described liquid crystal display method of the present invention. It is a program that works together.

Note that some means (or devices, elements, circuits, sections, etc.) of the present invention, and some steps (or steps, operations, actions, etc.) of the present invention are those plural means or It is meant to refer to some means or steps in a step, or to some functions or some operations in one means or step.

Further, some devices (or elements, circuits, parts, etc.) of the present invention mean some devices of the plurality of devices, or some means of one device. (Or, an element, a circuit, a part, etc.) or a part of the functions of one means.

A computer-readable recording medium in which the program of the present invention is recorded is also included in the present invention. Further, one usage form of the program of the present invention may be a mode in which the program is recorded in a computer-readable recording medium and operates in cooperation with the computer. Further, one usage form of the program of the present invention may be a mode in which the program is transmitted through a transmission medium, read by a computer, and operates in cooperation with the computer. The recording medium includes a ROM and the like, and the transmission medium includes a transmission medium such as the Internet and light, radio waves, sound waves and the like.

The configuration of the present invention may be realized by software or hardware.

The invention is a medium carrying a program for causing a computer to execute all or some of the functions of all or some of the means of the liquid crystal display device of the present invention described above, which is readable by the computer and The read program is a medium that executes the function in cooperation with the computer.

Further, the present invention is a medium carrying a program for causing a computer to execute all or some of the operations of all or some of the steps of the above-described liquid crystal display method of the present invention, which is readable by the computer. The read program is a medium that executes the operation in cooperation with the computer.

As described above, the present invention has, for example, a liquid crystal panel having a display capability of n scanning lines and a switching element in each pixel, and a signal line drive circuit for applying signal data to the liquid crystal panel. And a liquid crystal display device having a scanning line driving circuit for performing vertical scanning for controlling the on / off state of the switching element of the liquid crystal panel, wherein the number of scanning lines of the input image signal is n. In the blanking period of the image signal, when the scanning line number identification circuit identifies whether the number of scanning lines is equal to or less than m, and the scanning line number identification circuit identifies the input of the image signal of m scanning lines. n-
m) A scanning speed for controlling the scanning line driving circuit so as to change the scanning speed in the invalid display area of the books stepwise or continuously and at the same time controlling the output of the signal line driving circuit to display black. A liquid crystal display device having a variable circuit, wherein a scanning speed is stepwise when an image signal of m effective display scanning lines, which is smaller than the display capacity scanning line number n of the liquid crystal panel, is input. Alternatively, it has a function of making the black display continuously variable to make the brightness difference between the black display of the effective display area and the black display of the invalid display area inconspicuous.

Therefore, when an image signal of m effective display scanning lines, which is smaller than the display capacity scanning line number n of the liquid crystal panel, is input, the scanning speed in the invalid display area is stepped during the blanking period of the image signal. Black line in the effective display area by controlling the scanning line drive circuit by changing the output voltage or continuously, and at the same time, providing the scanning speed variable circuit that controls the output of the signal line drive circuit to output the black display. It is possible to obtain an effective effect that a liquid crystal display device capable of displaying image signals having various aspect ratios in higher quality can be realized by making the difference in brightness between the black display in the invalid display area and the black display inconspicuous.

[0054]

As is apparent from the above description,
The present invention is, for example, a luminance difference between a black display in an effective display area and a black display in an invalid display area when an image signal having an effective display scanning line number smaller than the display capacity scanning line number of a liquid crystal panel is input. It has the advantage that it can be made inconspicuous.

[Brief description of drawings]

FIG. 1 is a block diagram of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a waveform diagram showing an operation of the liquid crystal display device according to the first embodiment of the present invention.

FIG. 3 is a liquid crystal panel 11 according to Embodiment 1 of the present invention.
Display area diagram

FIG. 4 is a characteristic diagram of the voltage written in the liquid crystal element according to the first embodiment of the present invention with respect to time change.

FIG. 5 is a transmittance characteristic diagram with respect to an applied voltage of the liquid crystal element according to the first embodiment of the present invention.

FIG. 6 is a block diagram of a conventional liquid crystal display device.

FIG. 7 is a waveform diagram showing the operation of the conventional liquid crystal display device.

[Explanation of symbols]

11, 61 LCD panel 12, 62 Signal line drive circuit 13, 63 Scan line drive circuit 14, 64 Scan line number identification circuit 15 Scanning speed variable circuit 21,71 image signal 22,72 Image valid period 23,73 Blanking period 24, 74 scan clock pulse 25, 75 Normal scan pulse part 26 Scan pulse variable part 31 Effective display area 32 Invalid display area 65 High-speed scanning control circuit 76 High-speed scanning pulse part

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 5/66 102 H04N 5/66 102B F term (reference) 2H093 NA16 NC10 NC11 NC27 NC29 NC31 ND09 5C006 AA01 AA02 AB05 AC24 AF44 AF45 AF71 BB11 BC03 BC11 BC16 FA22 5C058 AA06 BA01 BA05 BA35 BB25 5C080 AA10 BB05 DD01 EE26 FF09 GG12 JJ01 JJ02 JJ04 JJ05

Claims (13)

[Claims] 1. A detection means for detecting the number of scanning signal lines to be used for displaying an image data signal input from the outside on a liquid crystal panel, and the detected number is the total number of the scanning signal lines. And (b) display the image data in an effective display area provided on the liquid crystal panel to be used for displaying the image data, and (b) display the image data on the liquid crystal panel. And a control means for performing control for displaying predetermined data in an invalid display area which is not used for display, wherein the control means scans the scanning signal line in all or part of the invalid display area. Liquid crystal display device for controlling the pulse width of the scanning clock signal to change substantially continuously. 2. The control for changing the pulse width of the scan clock signal for scanning the scan signal line substantially continuously is performed by changing the pulse width from a side closer to the effective display area to an inner side of the invalid display area. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is formed so as to decrease toward the right side. 3. A detection unit for detecting the number of scanning signal lines to be used for displaying an image data signal input from the outside on a liquid crystal panel, and the detected number is the total number of scanning signal lines. When the number is smaller than the above, (a) the image data is displayed in an effective display area which is provided in the center of the liquid crystal panel and should be used for displaying the image data, and (b) is provided above and below the liquid crystal panel, respectively. And a control means for performing control for displaying predetermined data in two invalid display areas not used for displaying the image data, wherein the control means is at least one of the two invalid display areas. 2. A liquid crystal display device for controlling the pulse width of a scanning clock signal for scanning the scanning signal line substantially continuously in all or part of the invalid display area. 4. The control for changing the pulse width of the scan clock signal for scanning the scan signal line substantially continuously is performed by changing the pulse width from a side closer to the effective display area to a middle side of the invalid display area. 4. The liquid crystal display device according to claim 3, wherein the liquid crystal display device is formed so as to decrease toward. 5. The scanning signal line scanning in the invalid display areas is performed simultaneously in the two invalid display areas by utilizing a blanking period of an image data signal input from the outside. Liquid crystal display device. 6. The pulse width of the scan clock signal for scanning the scan signal line in the effective display area is larger than the pulse width of the scan clock signal for scanning the scan signal line in the invalid display area. The liquid crystal display device according to claim 1. 7. The liquid crystal display according to claim 1, wherein the control for displaying the predetermined data in the invalid display area is a control for writing the data for black display in the invalid display area. apparatus. 8. A step of detecting the number of scanning signal lines to be used for displaying an image data signal input from the outside on a liquid crystal panel, and the detected number is less than the total number of scanning signal lines. In this case, (a) the image data is displayed in an effective display area provided on the liquid crystal panel and should be used for displaying the image data, and (b) the image data is displayed on the liquid crystal panel. And a step of performing control for displaying predetermined data in an invalid display area that is not used, wherein the control is a scan clock signal for scanning the scan signal line in all or part of the invalid display area. A liquid crystal display method in which the pulse width of the pulse is changed substantially continuously. 9. A step for detecting the number of scanning signal lines to be used for displaying an image data signal input from the outside on a liquid crystal panel, and the detected number is more than the total number of the scanning signal lines. When the number is small, (a) the image data is displayed in an effective display area that is provided in the center of the liquid crystal panel and should be used for displaying the image data, and (b) is provided above and below the liquid crystal panel, respectively. And a step of performing control for displaying predetermined data in two invalid display areas that are not used for displaying the image data, wherein the control is invalid display of at least one of the two invalid display areas. A liquid crystal display method in which the pulse width of a scan clock signal for scanning the scan signal line is changed substantially continuously in all or part of the region. 10. The liquid crystal display method according to claim 8, wherein the step of detecting the number of scanning signal lines to be used for displaying an image data signal input from the outside on a liquid crystal panel, and the detected number are When the number is smaller than the total number of the scanning signal lines, (a) the image data is displayed in an effective display area provided in the liquid crystal panel to be used for displaying the image data, and (b) the liquid crystal panel. A program for causing a computer to execute all or a part of a step of performing control for displaying predetermined data in an invalid display area which is not used for displaying the image data provided in. 11. A step of detecting the number of scanning signal lines to be used for displaying an image data signal input from the outside on a liquid crystal panel in the liquid crystal display method according to claim 9, and the detected step. When the number of scanning signal lines is smaller than the total number of scanning signal lines, (a) the image data is displayed in an effective display area which is provided in the center of the liquid crystal panel and should be used for displaying the image data; ) To cause the computer to execute all or part of the step of performing control for displaying predetermined data in two invalid display areas that are not used for displaying the image data provided above and below the liquid crystal panel, respectively. Program of. 12. The liquid crystal display method according to claim 8, wherein the step of detecting the number of scanning signal lines to be used for displaying an image data signal input from the outside on the liquid crystal panel, and the detected number are When the number is smaller than the total number of the scanning signal lines, (a) the image data is displayed in an effective display area provided in the liquid crystal panel to be used for displaying the image data, and (b) the liquid crystal panel. A medium carrying a program for causing a computer to perform all or part of the step of performing control for displaying predetermined data in an invalid display area not used for displaying the image data provided in , A computer processable medium. 13. A step of detecting the number of scanning signal lines to be used for displaying an image data signal input from the outside on a liquid crystal panel in the liquid crystal display method according to claim 9, and the detected step. When the number of scanning signal lines is smaller than the total number of scanning signal lines, (a) the image data is displayed in an effective display area which is provided in the center of the liquid crystal panel and should be used for displaying the image data; ) To cause the computer to execute all or part of the step of performing control for displaying predetermined data in two invalid display areas that are not used for displaying the image data provided above and below the liquid crystal panel, respectively. A medium that carries the program of, and is a medium that can be processed by a computer.