JP2650479B2 - Liquid crystal control circuit and liquid crystal panel driving method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal panel, and more particularly to a liquid crystal control circuit of an active matrix type liquid crystal panel and a driving method thereof.

2. Description of the Related Art Active matrix type liquid crystal panels have been actively researched and developed because of their large capacity and high resolution display. Since it is necessary to form a switching element for each pixel in the liquid crystal panel, defects are likely to occur, and the production yield is a problem. However, in recent years, the above problem has been gradually overcome by improvement and improvement of a manufacturing method and the like, and the direction of enlargement of the screen is progressing. On the other hand, a liquid crystal projection television for increasing the density of pixels of a liquid crystal panel and enlarging and projecting an image to display a large screen has been developed. As the LCD screen becomes larger in this way, problems with the LCD panel's image quality, such as the slowness of liquid crystal response and low gradation characteristics, become apparent, and an image comparable to that of a CRT display is called. Improving image quality is being challenged.

Hereinafter, a conventional liquid crystal control circuit and a driving method of a liquid crystal panel will be described. First, an active matrix type liquid crystal panel will be described. FIG. 21 is a configuration diagram of an active matrix type liquid crystal panel. In FIG. 21, G ₁ , G ₂ , G ₃ , and G ₄ are gate signal lines, S ₁ , S ₂ , S ₃ , and S ₄ are source signal lines, and T _{11 to} T ₄₄ are thin film transistors (hereinafter, referred to as switching elements). 2103 is a gate signal line G
Voltage of TET ON state ₁ ~G ₄ (hereinafter, referred to as ON voltage) or voltage to turn off (hereinafter, referred to as off-voltage) IC for applying a (hereinafter, referred to as gate drive IC) , 2102 is the IC (hereinafter, referred to as the source drive IC) for outputting a voltage to be applied to the pixel P ₁₁ to P ₃₄ to the source signal line S ₁ to S _4. Incidentally, each of the pixels P ₁₁ to P ₃₄ holds liquid, said liquid crystal transmittance changed by the voltage of the source drive IC2102, modulates the light. Although the number of pixels is very small in FIG. 21, tens of thousands of pixels are usually formed. The operation of the liquid crystal panel, the gate drive IC2103 is G _m (where m is the gate signal line number) from the gate signal lines G ₁ sequentially applied to on-voltage to. The source drive IC 2102 outputs a voltage to be applied to each pixel to source signal lines S _{1 to} S _n (where n is the number of source signal lines) in synchronization with the gate drive IC 2103. Therefore, a voltage for causing the liquid crystal to transmit a predetermined amount of transmission is applied to each pixel and held. The voltage is held at the next synchronization until each TFT is turned on again. The light transmitted or reflected by each pixel is modulated by the change in the transmission amount. Note that a period from when the voltage is applied to all the pixels to when the next voltage is applied again is called one frame. One frame is composed of two fields. Usually, in the case of a television image, one screen is rewritten in 1/30 second, so 1/30 second is one frame time. When writing a voltage to each pixel at double speed, 1/60 second is one frame time.

In this specification, a driving method of writing a voltage to each pixel at double speed will be described as an example. That is, one frame is set to 1/60 second, and one field = 1 frame.

Hereinafter, a conventional liquid crystal control circuit will be described. FIG. 22 is a block diagram of a conventional liquid crystal control circuit. In FIG. 22, reference numeral 2201 denotes an amplifier for amplifying a video signal; 2202, a phase division circuit for generating positive and negative video signals; 2203, an output switching circuit for outputting an AC video signal having a reversed polarity for each field; Is a driver control circuit for synchronizing and controlling the source drive IC 2012 and the gate drive IC 2103, and 2101 is a liquid crystal panel.

Hereinafter, the operation of the conventional liquid crystal control circuit will be described.
First, the gain of the video signal is adjusted by the amplifier 2201 so that the video output amplitude corresponds to the electro-optical characteristics of the liquid crystal. Next, the video signal whose gain has been adjusted is
At 2202, two video signals of a positive polarity and a negative polarity are generated by the circuit. Next, the two video signals enter an output switching circuit 2203, and the circuit outputs a video signal whose polarity is inverted for each field. The reason for inverting the polarity for each field in this manner is to apply an AC voltage to the liquid crystal and prevent the liquid crystal from deteriorating. Next, the video signal from the output switching circuit 2203 is input to the source drive IC 2102, and the source drive IC 2102 performs processing such as level shift of the video signal and A / D conversion by the control signal from the driver control circuit 2204, and performs gate drive. A predetermined voltage is applied to the source signal line of the liquid crystal panel 2101 in synchronization with the IC 2103.

Hereinafter, a conventional driving method of a liquid crystal panel will be described. FIG. 23 is an explanatory view of a conventional liquid crystal panel driving method. In FIG. 23, Fx (where x is an integer) is a field number, Dx (where x is an integer) is data corresponding to the voltage applied to the source signal line (hereinafter, referred to as voltage data), Vx (where (x is an integer) is generated from the voltage data, and the voltage output from the source drive IC 2102 to the source signal line, and Tx (where x is an integer) changes the transmittance of the liquid crystal when the voltage is applied to the pixel. And the amount of light transmitted when the state corresponding to the voltage is reached. In this specification, for the sake of simplicity, when the subscript x is large, the field Fx indicates that the field is the previous field, the voltage data Dx indicates that the value is large, and the applied voltage Vx indicates that the voltage is high. The amount Tx indicates that the transmission amount is large, that is, the transmittance of the liquid crystal is high. However, the relationship between the voltage applied to the liquid crystal and the transmission amount is not proportional to the size of the subscript of the transmittance Tx for exhibiting the non-linear characteristic and the actual transmission amount. In FIG. 23, the applied voltage Vx is shown as an absolute value for easy understanding. However, since the liquid crystal needs to be driven by an alternating current, as shown in FIG. Are applied with positive and negative voltages. The above applies to the following drawings. The following description focuses on one pixel.

The source drive IC 2102 samples and holds the input analog signal to create voltage data Dx. Also,
The IC stores the voltage data Dx for one scanning time, and outputs a voltage Vx applied to a source signal line in synchronization with the gate drive IC 2103. Now, the pixel of interest in the field (hereinafter, simply referred to as pixels) voltage data to is changed from D ₂ to D _6. Then, the source drive IC 2102 has the voltage V ₆
To the source signal line, and the voltage is
Synchronized with 2103 and input to the pixel. However,
In the field F _3, wherein even when the voltage V ₆ is applied to the voltage
Not the transmission amount T ₆ of the desired values corresponding to V _6, usually 3 to 4 or more fields later becomes T ₆ of the desired value. This is because the rising speed of the liquid crystal, that is, the response time from application of the voltage to the desired amount of transmission is slow. In the present specification, the rise of the liquid crystal means that in the case of a TN liquid crystal, a voltage is applied to the liquid crystal and the liquid crystal molecules are untwisted, and conversely, the fall of the liquid crystal is returned to the original state. State. The state of twisting of the liquid crystal is related to the amount of transmitted light. In this specification, it is assumed that as the applied voltage increases, the twisting of the liquid crystal unwinds and the transmittance increases. As described above, in the conventional liquid crystal panel driving method, the applied voltage Vx corresponding to the luminance signal of the video signal is applied to the pixel as it is.

However, in the conventional liquid crystal control circuit and the driving method therefor, the rising speed of the liquid crystal is slow, that is, it takes 3 to 4 fields or more to reach a predetermined transmission amount after applying a voltage. Appears. When the display pixel changes because the change in the transmittance of the liquid crystal does not follow the voltage applied to the pixel, the image of the previous field looks like a shadow, for example, at the outline of the image. Is a phenomenon that appears as an indicator on the display. This phenomenon appears when the image moves at a speed higher than a certain speed, and significantly degrades the image quality.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a liquid crystal control circuit and a method of driving a liquid crystal panel that can support large-screen, high-resolution image display.

Means for Solving the Problems In order to solve the above problems, the liquid crystal control circuit of the present invention comprises:
Storage means for storing first signal data corresponding to a voltage value applied to the liquid crystal; the first signal data;
Calculating means for calculating the second signal data corresponding to the voltage value applied to the liquid crystal after the signal data of the first and second signal data. The liquid crystal control circuit according to another aspect of the present invention stores first signal data corresponding to a voltage value applied to the liquid crystal. First storage means, calculation means for calculating the first signal data, second signal data corresponding to a voltage value applied to the liquid crystal after the first signal data, and calculation by the calculation means Correction means for correcting at least one of the second signal data and third signal data corresponding to a voltage value applied to the liquid crystal after the second signal data, based on the result; A second storage means for storing a value or a correction made by a second threshold value, wherein the first threshold value is a value which is immediately corrected by an operation result of the first signal data and the second signal data. The second threshold value is a value that is corrected when a predetermined value is exceeded a plurality of times as a result of processing the signal data of the same address over a plurality of fields by the arithmetic unit.

Further, in the method for driving a liquid crystal panel according to the present invention, the first signal data corresponding to the voltage value applied to the liquid crystal, the first signal data, and the voltage applied to the liquid crystal after the first signal data Calculating a second signal data corresponding to a value, and correcting the signal data to be continuously applied to the liquid crystal in a plurality of fields after the first signal data based on the calculation result. In another method of driving a liquid crystal panel according to the present invention, the absolute value V ₁ applied to an arbitrary pixel in the first field and the first value
In a case where the relationship of V ₁ <V ₂ holds for the absolute value V ₂ of the second voltage applied to the pixel in the second field after the third field, the third field after the second field or the second field field voltage of the absolute value is applied is greater than V ₂ in the, and is the third next lower voltage than the V ₂ at fields fields those characterized by applying to the pixel.

In another liquid crystal panel driving method according to the present invention, a transmittance curve is created or predicted from at least three consecutive field signal data applied to an arbitrary pixel, and the transmittance curve is smaller than a desired transmittance curve. The method is characterized in that the signal data of the continuous field is corrected when the signal data deviates by a predetermined value or more. Further, another method of driving a liquid crystal panel according to the present invention is to apply a signal to an arbitrary pixel in a first field. Absolute value of the first voltage
In the case where the second V ₁ <V ₂ becomes related to the absolute value V ₂ of the voltage applied to the pixel in the second field of the the V ₁ first field after the desired response time R When
R While the absolute value V ₃ as a function of the third voltage, or to previously obtain the V _3, said second field or the second
In the field after the field of
It is characterized in applying a V _3.

Action The response time of the rise time of the liquid crystal has a characteristic that it is almost inversely proportional to the square of the applied voltage as shown in FIG.
Thus, in the liquid crystal panel driving method of the present invention, the absolute value V ₁ of the first voltage applied to any pixel in the first field
And the absolute value V ₂ of the second voltage applied to the pixel in the second field after the first field has a relationship of V ₁ <V ₂ , the desired response time R The absolute value V ₃ as a function of the third voltage, applies the V ₃ to the arbitrary pixel in the second field or the second field after the field.

In the above-described liquid crystal panel driving method, the rise time of the liquid crystal is improved by applying a voltage having a large absolute value. However, even when the above method is used, a trailing edge of an image occurs in an image that moves fast. Therefore, in order to further improve the response time of the liquid crystal, a voltage having a considerably large absolute value is applied to the liquid crystal in the first field, and the liquid crystal is rapidly caused to rise. To fall. In this way, the voltage applied to the pixel is controlled over two fields, and the target transmittance of the liquid crystal is obtained on average over two fields.

In order to realize this driving method, the liquid crystal control circuit of the present invention has a corrector for comparing and calculating a voltage value applied to a pixel in a continuous field. If the rise and fall times of the liquid crystal are improved by changing the voltage applied to the liquid crystal in the two fields before and after, the display state of the image may be suddenly controlled, and the image display may be awkward. . Therefore, in another method of driving a liquid crystal panel according to the present invention, the applied voltage of the liquid crystal is corrected with an integral effect in consideration of the applied voltage over several fields. In order to realize this correction, the liquid crystal control circuit of the present invention has a corrector for comparing and calculating an applied voltage applied to the pixel over several fields, and the corrector corrects the applied voltage of the pixel when performing the correction. It also has a function of performing correction in consideration of a voltage value applied to a pixel near the pixel.

Embodiments Hereinafter, a liquid crystal control circuit according to the first embodiment of the present invention and a method for driving the first and second liquid crystal panels will be described with reference to the drawings. First, an embodiment of the liquid crystal control circuit of the present invention will be described.

FIG. 1 is a block diagram of a liquid crystal control circuit of the present invention.
However, parts unnecessary for the description are omitted. This is the same for the following drawings. In FIG. 1, 10
1 is a gain control circuit for defining the input voltage range to the A / D converter 103, 102 and 108 are low-pass filters, 1
04 is a field memory, 105 is an arithmetic unit for calculating data stored in the field memory, and calculating the size of the data memory and the difference in size between each data. 106 is a field memory 104 based on the output result of the arithmetic unit 105. A 107 is a D / A converter, 109 is a phase division circuit that creates positive and negative video signals, and 110 is an output switch that outputs an AC video signal with inverted polarity for each field A circuit 111 is a driver control circuit for synchronizing and controlling the source drive IC 112 and the gate drive IC 113. FIG. 2 is a block diagram of the field memory 104, the arithmetic unit 105 and the corrector 106 in FIG. In FIG. 2, 201, 202, 203, 204
Is a field memory switching circuit for connecting an arbitrary field memory among the field memories 205, 206, and 207 to a data input / output signal line, and setting so that writing and reading of the memory content can be performed; and 208, a difference between the data contents of the two field memories. Computing unit that determines whether or not data can be corrected based on the size of the data.
9 is a data corrector for correcting the contents of the field memory based on the output result of the arithmetic unit, and 210 is a data table which the data corrector refers to for data correction.
Further, the data table 210 is configured so that the correction data can be referred to by the difference ΔVx between the contents of the two field memories and the data Dx virtually in the memory as shown in FIG. 3, for example. Note that a cache memory for temporarily storing data contents, addresses, and the like may be added to the arithmetic unit 208 or the data corrector 209 as necessary due to the problem of data calculation and comparison speed.

Hereinafter, the liquid crystal control circuit according to the first embodiment of the present invention will be described with reference to FIG. 1, FIG. 2, and FIG. First, a video signal is subjected to gain adjustment by a gain control amplifier so as to match an input signal range of A / D conversion. Next, the signal passes through the LPF 102 to remove unnecessary high-frequency components, and is A / D-converted by the A / D converter 103. The data corresponding to the voltage applied to the A / D converted liquid crystal is sequentially stored in three fields for each field by the field memory switching circuit 201. That is, the data of the first field is stored in the field memory 205, the data of the second field is stored in the field memory 206, the data of the third field is stored in the field memory 207, and the data of the fourth field is stored in the field memory 205. In 205, the data of the fifth field is sequentially stored in the field memory 206. Here, for the sake of simplicity, the data of the first field is stored in the field memory 205, the data of the second field is stored in the field memory 206, and the data of the third field is stored in the field memory 207. The following description is based on the assumption that the order of data sent to the next D / A converter 107 is the order of the field memory 205, the field memory 206, and the field memory 207.

Now, the data in the field memory 205 is transferred to the D / A converter. The A / D converter 203 is provided in the field memory 20.
7 is writing data. Note that field memory 2
It is assumed that the content of the data of 05 has already been corrected.
At the same time, the arithmetic unit 208 is connected to the field memory switching circuit 202.
The memory 203 is connected to the field memories 205 and 206, and compares and calculates data corresponding to a voltage applied to the same pixel of the memory. When the operation result satisfies a predetermined condition, the address of the pixel on the field memory,
The data and the like are transferred to the data corrector 209. The data corrector 209 refers to the data table 210, obtains correction data, and writes the correction data at an address in the field 206 where data to be applied to the pixel is stored. At this time, information indicating the correction is recorded in the data. Specifically, a predetermined bit of data is turned ON. This operation is sequentially performed on the data in the field memory. The operation for the one field is completed within a time period for completing the data transfer in the field memory 205. Therefore, after the field memory 205, the D / A converter
The corrected data of the field memory 206 can be transferred to 107.

Next, when data in the field memory 206 is being transferred, the arithmetic unit 208 is switched to the field memory switching circuits 203 and 204.
Are connected to the field memories 206 and 207 by
Data corresponding to the voltage applied to the same pixel of the memory is compared and calculated. Further, the data corrector 209 corrects data in the field memory 207. At the same time, data digitized by the A / D converter 103 is sequentially stored in the field memory 205. The data corrected by performing the above operations sequentially is transferred to the D / A converter 107, and the signal that has been converted into an analog signal by the D / A converter 107 is subjected to removal of unnecessary high-frequency components by a low-pass filter 108. Are transferred to the phase division circuit 109. The following operation is almost the same as that of the conventional liquid crystal control circuit, and the description is omitted.

Hereinafter, an embodiment of a method for driving a liquid crystal panel according to the first invention will be described with reference to the drawings. FIG. 4 shows the first
FIG. 4 is an explanatory diagram of a method for driving a liquid crystal panel of the present invention. 4th
In the figure, the voltage data before correction is from D ₁ with field number F ₄
Shows a case where changes in D _5. Note that the voltage data
The permeation amount of liquid crystal obtained by the application of a voltage outputted to the source signal line from the source drive IC112 of V ₁ or said voltages V ₁ and T ₁ by D _1. The size of the suffix is added for ease of explanation, and does not quantitatively represent a physical size such as a voltage. This is the same in the following description. Also V ₅ a voltage output by the voltage data D _1, the transmission amount and T _5.

As shown in FIG. 4, when the voltages indicated by the voltages V ₁ and V ₅ are relatively small, that is, close to the common voltage and the relationship of V ₅ −V ₁ > 0 holds, the rising speed of the liquid crystal is slow and a predetermined transmission is required. It takes a long time to change to the amount. For example, TN liquid crystal is used in the reflection mode as an example, and the applied voltage is 2.0 V, the minimum voltage value at which the liquid crystal does not transmit light (hereinafter referred to as black level voltage), and the maximum voltage value at which the liquid crystal transmits the maximum amount of light (hereinafter, the white level voltage hereinafter) in the 3.5V liquid crystal panel, the applied voltage V ₁ 2.0 V, when a voltage V ₅ was changed to 2.5V a predetermined transmission amount time is about 70～100Msec.
Therefore, the time required for the response is two or more fields, and image tailing occurs. This response time decreases as the V ₅ increases, so to respond within 33msec in two fields.

Thus the voltage V ₅ is smaller than a predetermined value for correcting the voltage data such that the voltage higher than the voltage V ₅ in a field F ₄ for applying a voltage V ₅ is applied. Since the specific voltage variation of the pixel is seen when comparing the data of the fields F ₃ and F ₄ by the liquid crystal control circuit, is corrected by the data correction circuit 209 the data of the field memory F ₄ from D ₅ to D ₇ . The state of the data at that time is shown in the column of the correction voltage data in FIG.

Source drive IC112 applies a voltage consisting source signal line V ₇ by the correction voltage data D ₇ in field number F _4. Thus the rise characteristics of the liquid crystal is improved, a predetermined transmission amount T ₅ in one field indicated by F ₄ is obtained. Note that the correction voltage data, that is, the voltage V applied to improve the response at the time of rising of the liquid crystal, can be obtained by obtaining the constants of A, B, and C in the following equation (1) through experiments and the like.

Here, R is a response time determined by a desired image display state, and is a time that is an integral multiple of one field. If the aforementioned liquid crystal panel, for example, as the voltage V ₇ 3.0-3.5
By applying V, the response time can be improved to 20 to 30 msec.

FIG. 6 shows an example of correction of other data. In FIG. 6, the voltage data before correction is D _{1 in} field F ₁ , D ₅ in F ₂ ,
In F ₃ and D ₁₅ in D _10, F ₅ after at D _9, F _4. Incidentally, the predetermined value to be compared to D _11. In this case, first D ₁ and F _{2 of} F ₁
D ₅ -D _1> 0 and D ₅ by data D ₅ of it can be seen that less than the predetermined value D _11. Therefore D ₁ of the F ₂ and the like data table obtain correction data D ₇ is corrected to D _7. Then F ₂ D ₇
And D ₉ of F ₃ are compared, it is seen that D ₉ -D _7> 0 and D ₉ is smaller than the predetermined value D _11. Therefore, D ₉ of F ₃ obtains the correction data D ₁₀ from the data table is corrected to D _10. Of Next F ₃
D ₁₅ of D ₁₀ and F ₅ are compared. In this case, although D ₁₅ −D ₁₀ > 0, the data is not corrected because D ₁₅ is larger than the predetermined value D ₁₁ . Thus, D ₁₀ of F ₄ remains D _10.
As described above, the voltage data is sequentially corrected, and the corrected voltage data becomes as shown in the corrected voltage data column of FIG. 6, and the applied voltage as shown in FIG. 6 is applied to the pixel. As described above, the data is corrected to the voltage data, and an image having a predetermined response time, that is, an image without trailing pixels is obtained.

Hereinafter, a second embodiment of the liquid crystal panel driving method according to the first aspect of the present invention will be described with reference to the drawings. FIGS. 7A, 7B and 7C are explanatory views of a second embodiment of the method for driving a liquid crystal panel according to the first invention. FIG. 7 (a)
In the field number F is voltage data D ₁₅ from D _{10 3,} Figure 7 (b) in FIG. 7 (a) similarly to field number F ₃
In voltage data is changed in the same manner as D ₁₅ and FIG. 7 (a) from D _5. However, the amount of transmission of the liquid crystal is in the amount of transmitted T ₁₅ of a predetermined value in the field number F ₄ in the case of Figure 7 (a), but in time of FIG. 7 (b) in the field number F ₄ is not the transmission amount T ₁₅ of predetermined value. This is because the response time of the liquid crystal varies depending on the potential difference between the currently applied voltage and the voltage of the applied voltage for achieving the target transmission amount even if the target transmission amount is the same. For example, in the specification of the liquid crystal panel described above, when the applied voltage changes from 2V to 3V, it takes 40 to 50
Requires msec. Therefore, when the potential difference is 1 V (2-3 V), the response of the liquid crystal is slow, so that it is necessary to correct the voltage data. When changing from 2.5V to 3V, it responds in 20-30msec. Therefore, in the second embodiment of the method of driving the liquid crystal panel of the first aspect of the present invention as shown in Figure No. 7 (c), we obtain the correction data D ₁₇ and the like data table, field number F ₃
The data is corrected from D ₁₅ to D _17. As described above, when the potential difference between the voltage currently applied to the pixel and the voltage to be applied next is equal to or more than the predetermined threshold, the data is corrected. For Figure 7 (c), a field applied voltage V ₁₅ is applied, it improves the response time of the liquid crystal by applying a high applied voltage V ₁₇ than the voltage to the pixel, field number
Permeation T ₁₅ of a predetermined value is obtained by F _4. It should be noted that the first embodiment of the liquid crystal panel driving method of the first invention and the liquid crystal panel driving method of the second embodiment are combined, that is, the first voltage currently applied to the pixel and It is needless to say that a more optimal driving method of the liquid crystal panel can be performed by creating the correction data based on the potential difference of the second voltage applied to the pixel and the magnitude of the second voltage.

Hereinafter, an embodiment of the liquid crystal panel driving method according to the second aspect of the present invention will be described with reference to the drawings. FIGS. 8 (a) and 8 (b) are illustrations of a method for driving a liquid crystal panel according to the second invention. Voltage data Figure 8 (a) In the field number F ₄ is changed from V ₈ to V _4. However, the amount of transmission of the liquid crystal is not a permeation amount of a predetermined value in the field number F _4. This is because the responsivity at the time of falling of the liquid crystal is related to the potential difference between the voltage currently applied to the pixel and the next applied voltage. For example, in the specifications of the above-described liquid crystal panel and the like, when the applied voltage changes from 3.5 V to 2.0 V, it takes 30 to 40 msec to reach a predetermined transmission amount, but the applied voltage is changed from 3.5 V to 0 V In this case, it responds in 10 to 20 msec. Therefore, in the second liquid crystal panel driving method of the present invention as shown in Figure No. 8 (b), obtains the voltage data D ₄ is smaller than the correction data D ₁ from such a data table, the data field number F ₃ D ₈ is corrected to D _1. Thus the field number F _3, V ₄ applied by field number F ₄
Small voltages V ₁ than is to be applied to the pixel, the falling characteristics of the liquid crystal is improved. The correction data, that is, the correction applied voltage, is obtained by making the response time at the time of the liquid crystal fall approximately proportional to the magnitude of the changing voltage. Needless to say, a more optimal driving method of the liquid crystal panel can be performed by combining the second invention with the first invention. Further, in the embodiment of the present invention, data in only one field is corrected. However, the present invention is not limited to this. For example, as shown in FIG. The data may be corrected over a plurality of fields.
In the liquid crystal control circuit of the present invention, three field memories are used. However, the present invention is not limited to this. For example, the number of field memories is reduced by comparing data between fields using a delay circuit or the like. It goes without saying that you can do it. In addition, the voltage data of the same pixel between the fields is compared and calculated. For example, in the case of a television image, since the signals of the neighboring pixels are very similar, the voltage data of the pixel in the first field and the voltage data of the second pixel are compared. The voltage data near the pixel in the field may be compared. Further, in the embodiment of the liquid crystal control circuit of the present invention, the contents of the field memory between adjacent fields are calculated, but for example, data may be compared between the field memories 205 and 206 by the calculator 208. Not to mention.

Hereinafter, a liquid crystal control circuit and a third liquid crystal panel driving method according to the second embodiment of the present invention will be described with reference to the drawings. First, an embodiment of the liquid crystal control circuit according to the second invention will be described. FIG. 10 is a block diagram of the liquid crystal control circuit of the present invention. In FIG. 10, 1001 is a gain control circuit for defining the input voltage range to the A / D converter 1003, 1002 and 1012 are low-pass filters, 1004, 1005, 1006 and 10
07 is a field memory, 1008 is an arithmetic unit that operates on data stored in the field memory, and calculates the size of data and the difference between each data.1009 is a field memory that corrects data in the field memory based on the output result of the arithmetic unit 1008. A corrector 1010 is a data table that the data corrector 1009 refers to in order to obtain a data correction value.

Hereinafter, the liquid crystal control circuit according to the second embodiment of the present invention will be described with reference to FIG. First, the gain of a video signal is adjusted by a gain control amplifier so as to match the input signal range of A / D conversion. Next, the signal passes through the LPF 1002 to remove unnecessary high frequency components, and then the A / D converter 100
A / D conversion is performed in 3. Data corresponding to the voltage applied to the A / D-converted liquid crystal is sequentially stored in four field memories for each field. That is, the data of the first field is stored in the field memory 1004, the data of the second field is stored in the field memory 1005, the data of the third field is stored in the field memory 1006, and the data of the fourth field is stored in the field memory 1004. 1007, 5th
The data of the third field is sequentially stored in the field memory 1004. Here, for simplicity, the data of the first field is stored in the field memory 1004, the data of the second field is stored in the field memory 1005, and the data of the third field is stored in the field memory 1006.
The data of the fourth field is stored in the field memory
The order of the data stored in the field 1007 and sent to the next D / A converter 1011 is the field memory 1004, the field memory 1005, the field memory 1006, and the field memory 1007.
It is assumed that the order is the same.

Now, data in the field memory 1004 is transferred to the D / A converter. The A / D converter 1003 writes data in the field memory 1007. It is assumed that the data content of the field memory 1004 has already been corrected. At the same time, the computing unit 1008 is connected to the field memories 1004 and 1005, and compares and computes data corresponding to the voltage applied to the same pixel of the memory. When the operation result satisfies a predetermined condition, the address data and the like of the pixel on the field memory are transferred to the data corrector 1009. The data corrector 1009 refers to the data table 1010 to obtain correction data, and stores the correction data in a field memory.
The data to be applied to the pixel on 1005 and 1006 is written to the address where it is stored. At this time, information indicating that the data has been corrected is also written in the data. Field memory
If the data at 1005 has already been corrected, the data at the address is not corrected. This operation is sequentially performed on the data in the field memory. The above 1
The operation for one field is performed using the field memory 1004
It will be completed within the time when the transfer of the data is completed. Therefore, the corrected data in the field memory 1005 is transferred to the D / A converter 1011 next to the field memory 1004.
Next, when data in the field memory 1005 is transferred, the computing unit 1008 is connected to the field memories 1005 and 1006, and compares and computes data corresponding to the voltage applied to the same pixel in the memory. The data corrector 10
In step 09, the data in the field memories 1006 and 1007 is corrected. At the same time, A / D is sequentially stored in the field memory 1004.
The data digitized by the converter 1003 is stored. By performing the above operations sequentially, the data corrected
The signal transferred to the A converter 1011 and converted to an analog signal by the D / A converter 1011 is transferred to a phase division circuit 1013 after unnecessary high frequency components are removed by a low-pass filter 1012.
The following operation is almost the same as that of the conventional liquid crystal control circuit, and the description is omitted. The arithmetic unit is expressed as one for one field memory. However, due to problems such as the operation speed, one field memory is usually divided into a plurality of regions, and one arithmetic unit is provided for each divided field memory. May be provided. The same applies to the data corrector.

Hereinafter, an embodiment of the liquid crystal panel driving method according to the third aspect of the present invention will be described with reference to the drawings. FIG. 11 is an explanatory diagram of a driving method of the liquid crystal panel of the third invention. No.
From D ₂ at voltage data frame number F ₃ before correction 11 FIG.
Shows a case in which changes to D _6. Note that the voltage data
The D ₂ the transmission amount of the liquid crystal a voltage output to the source signal line from the source drive IC1016 obtained by the application of V ₂ or the voltages V ₁ and T _2. Similarly, the voltage output from the voltage data D ₆ is V ₆ , and the steady transmission amount by the voltage is T ₆
And As shown in FIG. 11, the voltages indicated by the voltages V ₂ and V ₅ are relatively small, that is, close to the common voltage and V ₆ −V ₂ >
When the relationship of 0 is established, the rising speed of the liquid crystal is slow and it takes a long time to change to a predetermined transmission amount. This response time decreases as V ₆ increases, so respond within 1/30 seconds in two fields.

Therefore a liquid crystal control circuit of the present invention in the liquid crystal driving method of the present invention, sequentially compares the voltage data of the field memory voltage field memory field number F ₂ data and field number F _3, for example, in Fig. 11 pixel voltage data field number F ₃ has changed from D ₂ to D ₆ as indicated, if the slow and calculator 1008 rise time determines and sends a signal to the data corrector 1009. Data compensator 10
09 corrects the voltage data of the pixel of the field memory field number F ₃ and F ₄ based on the signal. In this case, the voltage data of the field number F ₃ is the voltage data D ₆
Greater than, the voltage of the field number F ₄ is less corrected than the voltage data D _6. The correction data is determined in advance by experiments or the like.

By the above processing, the voltage data is as shown in the correction voltage data column in FIG. The data is sequentially D / A converted and sent to the source drive IC 1016, where
The applied voltage shown in the figure is applied to the pixel. First the field number
Voltage V ₈ in F ₃ is applied, the liquid crystal rises rapidly, a steady permeation T ₈ in one field time. Next field number F ₄ voltage V ₄ is applied, the liquid crystal becomes constant permeation T ₄ in the falling field time. Further, by voltage V ₆ of the target it is applied by field number F _5, the target transmission amount T ₆ is obtained.

More the magnitude of the applied voltage V ₈ and V ₄ are voltages that area of the area of A and B shown by oblique lines in Figure 11 becomes effectively equal chosen. Accordingly, the target transmission amount in field number F ₃
Becomes bright for exceeding T _6, darkened because falls below the target transmission amount T ₆ in field number F _4. But the change is 1/30
Since it is seconds, it looks visually that the target transmission amount T ₆ can be obtained substantially from the field number F ₃ . By correcting the voltage data as described above, the rise time of the liquid crystal, that is, the response speed is improved, and an image without trailing images can be obtained.

Hereinafter, a second embodiment of the liquid crystal panel driving method according to the third aspect of the present invention will be described with reference to the drawings. Fig. 12,
FIG. 13 and FIG. 14 are explanatory diagrams of a driving method of the liquid crystal panel in the second embodiment of the third invention. The field number F ₃ D ₁₅ voltage data from the D ₁₀ in the FIG. 12, the voltage data from the D ₅ at field number F ₃ in FIG. 13 as with FIG. 12
It is changed to D _15. However, the amount of transmission of the liquid crystal is in the amount of transmitted T ₁₅ of a predetermined value in the field number F ₄ in the case of Figure 12, but the amount of transmitted predetermined value for a time period within a field number F ₄ in FIG. 13 T It is not ₁₅ . This is because, as described above, even when the response time of the liquid crystal has the same target transmission amount, the time required for the change depends on the potential difference between the currently applied voltage and the voltage of the applied voltage for achieving the target transmission amount. That's why.

Therefore, in the present embodiment shown in FIG. 14, we obtain the correction data D ₁₉ and the like data table, field number F
The _third data is corrected to D ₁₉ from D _15. The data field number F ₄ corrects the D ₁₅ to D _12. The above processing is performed using the liquid crystal control device according to the second embodiment of the present invention as in the first embodiment. As described above, when the voltage difference between the voltage currently applied to the pixel and the voltage to be applied next is equal to or larger than the predetermined threshold, the voltage data is corrected. Therefore, the voltage V ₁₉ at field number F ₃ as in FIG. 14 is applied, the liquid crystal rises rapidly, steady permeation T within one field time
It becomes ₁₉ . Then the voltage V ₁₂ at the field number F ₄ is applied, the liquid crystal becomes constant permeation T ₁₂ in one field time. Incidentally, are chosen in magnitude voltage area of the area of A and B indicated by hatching in FIG. 14 becomes effectively equal the applied similarly to the driving method of the liquid crystal panel voltage V ₁₉ and V ₁₂ of the present invention described above You. Thus, the visual target transmission amount T ₁₅ of approximately the specified value from Fuirudo number F ₃ is obtained.

The method for driving the liquid crystal panel according to the first embodiment of the second embodiment of the present invention is combined with the method for driving the liquid crystal panel according to the second embodiment. It goes without saying that a more optimal liquid crystal panel driving method is performed by correcting the voltage data according to the potential difference of the second voltage to be applied next and the magnitude of the second voltage. In the liquid crystal control circuit according to the second embodiment of the present invention, an example in which four field memories are used has been described. However, the present invention is not limited to this. The data comparison of the field memory is described as comparing and processing adjacent field data, for example, between the field memories 1005 and 1006. However, the present invention is not limited to this. For example, comparing and processing the data between the field memories 1005 and 1007 is performed. It is clear that the same effect can be obtained. This can be said for the driving method of the liquid crystal panel of the present invention.

In the embodiment of the present invention, the voltage data applied to the same pixel between the field memories are compared and processed. However, the present invention is not limited to this. This is because, in the case of video display, voltage data of an arbitrary pixel and pixels in the vicinity thereof are very similar. For example, voltage data of an arbitrary pixel in the first field and voltage of a pixel adjacent to the pixel in the second field are similar. It is clear that a similar effect can be obtained by comparing and processing the data.

Further, the liquid crystal control circuit of the third invention and the method of driving the liquid crystal panel of the fourth invention will be described with reference to the drawings. First, an embodiment of the liquid crystal control circuit according to the third aspect of the present invention will be described. FIG. 15 is a block diagram of the liquid crystal control circuit of the present invention. In FIG. 15, 1501 is a gain control circuit for providing an input voltage range to the A / D converter 1503, 1502 and 1506 are low-pass filters, 1504 is a data processing block, and more specifically, FIG. As shown in the figure, 1505 is a D / A converter, 1507 is a phase division circuit that creates positive and non-polar video signals, 1508 is an output switching circuit that outputs an AC video signal with inverted polarity for each field, 1509 is a source drive IC1510 and gate drive
A driver control circuit for synchronizing and controlling the IC 1511. Further, in FIG. 16, reference numeral 1601 denotes a field memory block having a field memory 1 and a field memory 2, and 1602 selects the field memory 1 or 2, and the A / D converter 1503 stores the data in the field memory according to the address indicated by the address counter. Data input means 1603 for writing digitized data is provided in the field memory 1 according to the address indicated by the internal address counter.
And 2) read the data at the same address, perform a comparison process, and use the data table 1604 to determine the difference between the ideal transmittance and the predicted actual transmittance, and when the difference between the transmittances is larger than a predetermined threshold. Data processing means having a function of correcting data at the address in the field memory 1 or 2 and a function of recording the correction. Reference numeral 1604 denotes a data table for outputting the difference between the above-described transmittances and, if necessary, correction data to the data processing means 1603 based on two data at two addresses.
Is a data output means for selecting the field memory 1 or 2 and sequentially reading data from the field memory according to the address indicated by the address counter, and sending the data to the D / A converter 1505.

In FIG. 16, an example in which one data processing means is used for one field memory block has been described. However, since image data per field is very large, a field memory corresponding to one field is divided into a plurality of blocks. The data may be divided and data processing means may be provided for each block to perform parallel processing. A plurality of data input means 1602 and data output means 1605 are provided as needed to perform parallel input / output processing.

Hereinafter, the liquid crystal control circuit of the present invention will be described with reference to FIG. 15 and FIG. First, the gain of the video signal is adjusted by the gain control amplifier 1501 so as to match the input signal range of the A / D converter. Next, the signal passes through a low-pass filter 1502 to remove unnecessary high-frequency components, and is A / D-converted by an A / D converter 1503. A / D
Data corresponding to the voltage applied to the converted pixel is input to the data input unit 1602. The data input means 1602 selects the field memory 1 or 2 for each field and writes the data in the field memory according to the address value indicated by the address counter. On the other hand, the data output means 1605 selects the other field memory selected by the data input means 1602, sequentially reads data from the field memory according to the address value indicated by the internal address counter, and
Transfer to A converter 1505. Now, in order to facilitate the explanation, the field number 1 is currently stored in the field memory 1.
It is assumed that the data of field number 3 has been written in the field memory 2.
The data input means 1602 selects the field memory 2, the address counter (hereinafter referred to as the input counter) selects the address 3, the data output means 1605 selects the field memory 1, and the address counter (hereinafter referred to as the output counter). Address 1) and the data processing means 1603
The description will be made on the assumption that the address counter (referred to as the processing counter) of FIG.

As described above, in the above-described state, the data at address 3 of the field memory 2 is input, the data at address 1 of the field memory 1 is read, and the contents of address 2 of the field memories 1 and 2 are read and processed. Have been. The three counters are simultaneously counted up in synchronization with a clock. Data processing means 1603
Reads data D ₆ of the data D ₅ and the field memory 2 address 2 field memory 1. The data is transferred to a data table 1604. Then, the data table 1604 returns a difference in transmittance based on the data. If the value is equal to or less than the predetermined threshold value, nothing is performed, and the processing counter points up by one address to point to address 3. At the same time, the output counter is address 2 and the input counter is address 4
Point to. Note that there are two predetermined thresholds. These are temporarily referred to as a first threshold and a second threshold. These are both thresholds for comparing with the difference in transmittance, and the first threshold is the current data processing means 16 when the difference in transmittance exceeds the threshold.
03 is used to immediately correct the data at the address being processed, and the second threshold is the current value when the data processing means 1603 processes the data at the same address over a plurality of fields and exceeds the threshold value a plurality of times. This is for correcting the data at the address where the processing is being performed.

As described above, the three counters sequentially increase the address, and the data in the field memory is processed. Now, it is assumed that the processing counter points to address 4. Then read the data processing unit 1603 data D ₁₂ of the data D ₂ and the field memory 2 address 4 of the address 4 field memory 1, and transfers the data table 1604. It is assumed that the data size and the difference between the data sizes are large. That can not follow the liquid crystal from the applied voltage V ₂ corresponding to the data D ₂ to the change in the applied voltage V ₁₂ corresponding to the data D _12, the difference in transmittance exceeds a first threshold value. Then, the data table 1604 sends the difference in transmittance and the correction value, for example, the voltage data D ₁₄ to the data processing unit 1603. If the data processing unit 1603 to the difference of the transmittance is determined to exceed the first threshold value, it corrects the data D ₁₂ of the address of the field memory 2 4 D _14, also corrected for exceeding the first threshold value correction section Is written, for example, 1 is written. Note that, specifically, a correction column may not be provided, and a flag may be provided at a predetermined bit position of data bits and written in the flag. In this case, the memory required for the correction column shown in FIG. 16 is not required. In this embodiment, data processing means
At 1603, it was determined that the difference in the transmittance exceeded the first threshold value.
Given one data, the data table 16
From 04, the information that the correction value and the first threshold have been exceeded may be sent to the data processing means 1603. The same applies to the following description. When the above processing is completed, the three counters increase the address.

Next, the data processing means 203 reads the data D _{4 at} the address 5 of the field memory 1 and the data D ₈ at the address 5 of the field memory 2 and transfers them to the data table 1604. It is assumed that the data size and the difference between the data sizes are relatively large. That can not follow the liquid crystal from the applied voltage V ₄ corresponding to the data D ₄ to the change of the applied voltage V ₈ corresponding to the data D _8, when it difference in transmittance does not exceed the first threshold value exceeds a second threshold value I do. Then, the data table 1604 sends the difference of the transmittance or exceeding the second threshold value and the correction value to the data processing means 1603. The data processing means 1603 performs two kinds of processing depending on whether or not data is written in the correction column at the address 5 of the field memory 1.

First, when it is recorded in the correction column of the field memory 1 that the data exceeds the second threshold value in the previous inter-field processing but the data correction is not performed, the data of the current processing address in the field memory 2 is corrected. The fact that the data has been corrected is recorded in the correction column. Conversely, when nothing is described in the correction column of the field memory 1 or when data exceeding the first or second threshold is corrected, the data at the address of the field memory 2 is not corrected, and the second threshold is displayed in the correction column. Write only those that exceeded. That is, assuming that data processing between field numbers 2 and 3 is currently performed, when the previous data processing between field numbers 1 and 2 was performed, the processing method depends on whether data correction for field number 2 was performed. different. Thus, the first threshold is 1
If it is determined that the number of times exceeds the threshold value, the data correction is performed. If the second threshold value exceeds the threshold value twice consecutively, the data correction is performed. In the example shown in FIG. 16, since nothing is written in the correction column of the address 5 of the field memory 1, the fact that the data of the address 5 of the field memory 2 exceeds the second threshold in the correction column without being corrected, for example, Write 2 The above processing is performed for all addresses. Similar processing is performed for the next field number 4. That is, the data of the field number 4 is input to the data input unit 1602.
To sequentially write from address 1 of the field memory 1. Further, the data output unit 1605 sequentially reads the data of the field number 3 for which the correction processing has been completed from the address 4 of the field memory 2. Also, data processing means 1603
Performs the reading process of the data in the field memories 1 and 2 sequentially. Naturally, the three address counters are synchronized and controlled so that addresses do not overlap.

Hereinafter, a method of driving a liquid crystal panel according to the fourth embodiment of the present invention will be described with reference to the drawings. In FIG. 17,
Correction data column shows the place where the data of the field number F ₂ by the liquid crystal control circuit of the present invention has been corrected from D ₇ to D _9. The applied voltage shows the waveform of the applied voltage to the liquid crystal based on the correction voltage data, and in the transmittance column, the solid line shows the ideal transmittance curve and the dotted line shows the actual transmittance curve based on the corrected applied voltage.

The voltage data was originally changed from D ₁ of the field number F ₁ to D ₇ in field number F _3, the data processing unit 1603
In the difference in transmittance it is determined that exceeds the first threshold value, the data of the field number F ₂ is corrected to D _9. As described above, since the response speed of the liquid crystal is almost inversely proportional to the square of the applied voltage as shown in FIG. 5, when the rising of the liquid crystal is slow, a voltage having an absolute value larger than a predetermined value is applied. Can improve it. By correcting the applied voltage in this manner, the image display is prevented from being delayed, and a good image quality can be obtained.

Hereinafter, a second embodiment of the liquid crystal panel driving method according to the fourth aspect of the present invention will be described. FIG. 18, FIG. 19, and FIG. 20 are explanatory views for explaining the method of driving the liquid crystal panel of the present invention. Now, as shown in FIG. 18, the applied voltage is V ₁ → V ₄ → V ₇ →
Consider a case that has changed with the V _9. Change in transmittance follows the ideal applied voltages, but it should be the transmission curve of the lower ideal, because the response of the liquid crystal is slow, the difference in transmittance magnitude of b in field number F ₂ and, c in the field number F ₃
Deviate by the size of The values of b and c are smaller than the first threshold but larger than the second threshold. As described above, when a difference in transmittance occurs over a plurality of fields, an image may be tailed, and the image quality may be degraded. Therefore the liquid crystal control circuit of the present invention, as shown in the column of the correction voltage data of Figure 19, to correct the data of the field number F ₃ from D ₇ to D _9. That is,
Field number difference in transmittance from F ₁ in F ₂ exceeds the second threshold value, and field number difference in transmittance from F ₂ even F ₃ is the second
Since it is predicted that the threshold value will be exceeded, data correction is performed. Thus performs data correction improves the response time of the liquid crystal by applying a V ₉ the applied voltage in field number F _3, etc. tails attract the image becomes hard to occur, the image quality is improved. As described above, the voltage data is corrected in consideration of the change in the transmittance over a plurality of fields.
Figure 20 contains an abnormal voltage data due to noise or the like, such as a field number F ₂ data D ₄ to the voltage data as to prevent that follows the abnormal voltage data change of faithfully transmittance of That's why. That is, if the voltage data is not corrected, the response time of the liquid crystal is slow, and the liquid crystal has the effect of a low-pass filter. In addition, since the correction is performed in consideration of the transmittance of the liquid crystal over a plurality of fields, by performing the data correction amount optimally, overcorrection is not applied,
Good image quality is obtained.

Needless to say, by combining the liquid crystal driving method according to the first embodiment of the present invention with the liquid crystal driving method according to the second embodiment, a more optimal liquid crystal panel driving method can be performed. .

Further, in the present embodiment, the data in only one field is corrected, but the present invention is not limited to this.
For example, data may be corrected over a plurality of fields in consideration of the characteristics of the liquid crystal and the required image display state.

In the liquid crystal control circuit of the present invention, two field memories are used. However, the present invention is not limited to this. For example, the same processing can be performed using three or more field memories. In addition, a configuration using one field memory is also possible by performing pipeline processing. Further, in the present embodiment, the data is corrected by processing the voltage data to the same pixel. However, the present invention is not limited to this. For example, in the case of an image, the voltage data applied to an arbitrary pixel and the next field are used. It goes without saying that the same processing can be performed by processing the voltage data applied to the pixels in the vicinity of the pixel described above. Also, in the liquid crystal control circuit of the present invention, the voltage data is D / A converted and input to the source drive IC. However, when the source drive IC is of a digital data input type, the source data is directly converted without D / A conversion. What is necessary is just to transfer drive IC voltage data.

Although a plurality of field memories are used in FIGS. 2 and 10, the present invention is not limited to this. For example, it is clear that a liquid crystal control circuit having the same function can be constituted by one or two field memories by using the pipeline processing technology.

In addition, it is needless to say that by optimally combining the first, second, third and fourth liquid crystal panel driving methods of the present invention, a more optimal liquid crystal panel driving method can be realized. It goes without saying that a more optimal liquid crystal control circuit can be realized by optimally combining the liquid crystal control circuits of the second and third inventions.

Effects of the Invention As is apparent from the above description, by using the liquid crystal panel driving method and the liquid crystal control circuit of the present invention, the response time can be reduced in order to achieve the rise of the liquid crystal, that is, the target transmission amount. Therefore, a good image can be obtained without trailing of the image. This appears as a remarkable effect as the screen size of the liquid crystal panel increases and the resolution increases.

[Brief description of the drawings]

1 and 2 are block diagrams of a liquid crystal control circuit according to the first embodiment of the present invention, FIG. 3 is a data table diagram, and FIGS. 4 and 6 explain a method of driving the liquid crystal panel of the first embodiment of the present invention. FIG. 5 is a characteristic diagram of the applied voltage and response time of the liquid crystal, and FIG.
(B), (c) and FIG. 9 are explanatory views of the liquid crystal panel driving method of the first embodiment of the present invention in the second embodiment, and FIGS. 8 (a) and (b) are diagrams of the second embodiment of the present invention. FIG. 10 is an explanatory diagram of a liquid crystal panel driving method, FIG. 10 is a block diagram of a liquid crystal control circuit of the second invention, FIG. 11 is an explanatory diagram of a liquid crystal panel driving method of the third invention, FIG. FIG. 13 and FIG. 14 are explanatory views of a third embodiment of the liquid crystal panel driving method according to the present invention,
FIGS. 15 and 16 are block diagrams of the liquid crystal control circuit of the third embodiment of the present invention, and FIGS. 17, 18, 19 and 20 are explanatory diagrams of the driving method of the liquid crystal panel of the fourth embodiment of the present invention. FIG. 21 is a block diagram of an active matrix type liquid crystal panel, FIG. 22 is a block diagram of a conventional liquid crystal control circuit, and FIGS. 23 and 24 are explanatory views of a conventional liquid crystal panel driving method. 101,1001,1501 ... Gain control circuit, 102,108,1
002,1012,1502,1506 …… Low-pass filter, 103,1003,1
503 …… A / D converter, 104,205,206,207,1004,1005,1006,1
007 …… Field memory, 105,208,1008 …… Calculator, 1
06,209,1009 …… Compensator, 107,1011,1505 …… D / A converter, 109,1013,1507 …… Phase division circuit, 110,1014,1508…
... Output switching circuit, 111,1015,1509 ... Driver control circuit, 112,1016,1510 ... Source drive IC, 113,1017,
1511 gate drive IC, 114, 1018, 1512 liquid crystal panel, 201, 202, 203, 204 field memory switching circuit, 210, 301, 1010 data table, 1504 data processing block, 1601 field memory block
1602 ... data input means, 1603 ... data processing means, 16
04 Data table, 1605 Data output means.

 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-64-10299 (JP, A) JP-A-57-133487 (JP, A) JP-A-59-171929 (JP, A)

Claims (8)

(57) [Claims] A storage means for storing first signal data corresponding to a voltage value applied to the liquid crystal; a first signal data; and a voltage value applied to the liquid crystal after the first signal data. Calculating means for calculating the corresponding second signal data; and correction for continuously correcting the signal data to be applied to the liquid crystal in a plurality of fields subsequent to the first signal data based on the calculation result of the calculating means. A liquid crystal control circuit comprising means. 2. A first signal data corresponding to a voltage value applied to the liquid crystal, the first signal data, and a second signal data corresponding to a voltage value applied to the liquid crystal after the first signal data.
And a signal data to be continuously applied to the liquid crystal in a plurality of fields subsequent to the first signal data, based on the result of the calculation. 3. An absolute value V _{1 of a first} voltage applied to an arbitrary pixel in a first field and an absolute value of a second voltage applied to the pixel in a second field after the first field. in the case where the V ₂ V ₁ <V ₂ becomes relationship holds, a voltage of absolute value greater than the V ₂ is applied in the third field of the second field or the second field after, and wherein the method of driving a liquid crystal panel, characterized in that in the next field of the third field applying a voltage less than the V ₂ to the pixel. Wherein V ₁ to the absolute value V ₂ of the second voltage applied to the pixel in the second field of the absolute values V ₁ and the first field after applying an arbitrary pixel in the first field <V ₂
In the case where the relationship is established, the application of a large voltage absolute value V ₃ than V ₂ in the second field or a third field of the second field after, and, first of the next of said third field 4 fields is applied a voltage less than the V ₂ to the pixel, the amount of transmitted light varies than the desired value by application of the V _3, transmission of light which varies from a desired value by application of said V ₄ A method of driving a liquid crystal panel, wherein the two are effectively substantially equal. 5. A transmissivity curve is created or predicted from at least continuous three-field signal data applied to an arbitrary pixel, and when the transmissivity curve deviates from a desired transmissivity curve by a predetermined value or more, the continuous curve is generated. A method for driving a liquid crystal panel, comprising correcting signal data of a selected field. 6. A first storage means for storing first signal data corresponding to a voltage value applied to a liquid crystal; applying said first signal data to said liquid crystal after said first signal data. Calculating means for calculating a second signal data corresponding to a voltage value; and a third signal corresponding to a voltage value applied to the liquid crystal after the second signal data and the second signal data, based on a calculation result of the calculating means. Correction means for correcting at least one of the following signal data, and second storage means for storing that the signal data has been corrected by a first threshold value or a second threshold value, wherein the first threshold value is The second threshold value is a value that is immediately corrected by the operation result of the first signal data and the second signal data, and the second threshold value is obtained at a plurality of positions in the result that the operation means processes the signal data of the same address over a plurality of fields. A liquid crystal control circuit characterized in that the value is corrected when the value exceeds a fixed value. 7. An absolute value V1 of a _first voltage applied to an arbitrary pixel in a first field and an absolute value of a second voltage applied to the pixel in a second field after the first field. the V ₂ in the case V ₁ <V ₂ becomes relevant, the R desired response time, a, B, when formed into a C constant, while the absolute value V ₃ of the third voltage from the following equation or to previously obtain the V _3, said second field or method of driving a liquid crystal panel and applying the V ₃ to the arbitrary pixel in the second field after the field. 8. An absolute value V1 of a _first voltage applied to an arbitrary pixel in a first field and an absolute value of a second voltage applied to the pixel in a second field after the first field. When V ₂ has a relationship of V ₁ <V ₂ and R is a desired response time, R is While the absolute value V ₃ of the third voltage from the following equation as a function, or to previously obtain the V _3, the said arbitrary pixel in the second field or the second field after the field V _{3. A} method for driving a liquid crystal panel, wherein ₃ is applied.