JP2009175212A - Method of controlling electro-optic device, electro-optic device and electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of controlling an electro-optic device, an electro-optic device and an electronic device, preventing the occurrence of flickering even in solid display by improving the balance of driving frequency between pixels of odd-numbered lines and pixels of even-numbered lines in interlace displaying an image. <P>SOLUTION: In the electro-optic device 100, a plurality of pixels 11 are arranged corresponding to the intersection of a plurality of scanning lines 3 and a plurality of data lines 6, and under the control from an interlace control part 50, among the plurality of scanning lines 3, an odd-numbered field for driving the odd-numbered scanning lines 3 and an even-numbered field for driving the even-numbered scanning lines 3 are alternately performed to display an image. In the interlace control part 50, a field select part 53 selects a field in starting image display or a field in ending image display to compress a difference between the cumulative execution frequency of the odd-numbered field in which the odd-numbered field is performed and the cumulative execution frequency of even-numbered field in which the even-numbered field is performed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a control method for an electro-optical device such as a liquid crystal device or an organic electroluminescence (hereinafter referred to as organic EL) device, an electro-optical device employing the control method, and an electronic apparatus including the electro-optical device. .

  Typical examples of the electro-optical device include a liquid crystal device and an organic EL device, and such an electro-optical device corresponds to the intersection of a plurality of scanning lines and a plurality of data lines extending in directions intersecting each other. A plurality of pixels are provided.

  In such an electro-optical device, when an image is displayed in an interlaced manner, as shown in FIG. 9A, an odd-numbered field for sequentially driving odd-numbered scanning lines among a plurality of scanning lines and an even-numbered scanning. An image is displayed by alternately performing even fields in which lines are sequentially driven.

When performing such interlaced display, if there is a luminance difference between the odd field and the even field, there is a problem that flicker (flicker) occurs. Therefore, in the liquid crystal device, the type of alignment film or liquid crystal, Attempts have been made to improve driving elements and driving methods. For example, a method for preventing the occurrence of flicker by correcting data signals supplied to adjacent pixels has been proposed (see Patent Document 1).
Japanese Patent Laid-Open No. 04-296173

  However, even if the method described in Patent Document 1 is employed, there is a problem in that flicker cannot be prevented because there is no signal correction effect when a solid image is displayed.

  Here, the inventor of the present application examines a countermeasure against flicker from a new viewpoint that the luminance characteristic shifts for each pixel due to microscopic deterioration caused by accumulation of stress when the pixel is driven, It is proposed to eliminate flicker. That is, after starting the image display from the odd field, the inventor of the present application, as shown in FIG. 9B, always ends in the even field, so that the pixels corresponding to the odd-numbered scanning lines (pixels in the odd-numbered rows). And the pixels corresponding to the even-numbered scanning lines (even-numbered rows of pixels) are evenly driven, so that the odd-numbered and even-numbered rows of pixels have the same degree of microscopic degradation. Although there is no difference in the characteristics, as shown in FIG. 9C, when the image display frequently ends in the odd field, the pixels in the odd rows are driven more than the pixels in the even rows. As a result, the degree of microscopic deterioration in the pixels in the odd-numbered rows is larger than that in the pixels in the even-numbered rows, resulting in a difference in luminance characteristics and flickering. Such microscopic deterioration is considered to be caused by accumulated stress of a DC component applied to the pixel even when alternating current is adopted in the liquid crystal device, and in the organic EL device, it is caused by energization time or current level. This is considered to be caused by accumulation of heat stress on the organic EL element.

  In view of the above problems, an object of the present invention is to improve the balance of the number of times of driving with respect to odd-numbered pixels and even-numbered pixels when displaying an image in an interlaced manner. An optical device control method, an electro-optical device that employs the control method, and an electronic apparatus including the electro-optical device.

  In order to solve the above-described problem, in the present invention, in the image display unit in which a plurality of pixels are arranged corresponding to the intersection of a plurality of scanning lines and a plurality of data lines extending in directions intersecting each other, In the control method of the electro-optical device for interlaced display of images by alternately performing odd fields for sequentially driving odd-numbered scanning lines and even-numbered fields for sequentially driving even-numbered scanning lines among the scanning lines of The field at the start of image display is switched between the odd field and the even field so as to compress the difference between the cumulative execution count of the odd field and the cumulative execution count of the even field. .

  In the present invention, “image display” refers to displaying an image in one or more frames after starting driving for a scanning line based on an external operation or the like, and then driving to the scanning line based on an external operation or the like. This means a series of operations until the operation is stopped.

  In the present invention, when an image is displayed in an interlaced manner, the starting field is switched between an odd field and an even field, and the difference between the cumulative execution count of the odd field and the cumulative execution count of the even field is compressed. For this reason, the number of times that the pixels corresponding to the odd-numbered scanning lines (odd-row pixels) and the pixels corresponding to the even-numbered scanning lines (even-numbered rows) are driven is equal. Therefore, since the degree of microscopic degradation is equal between the odd-numbered pixels and the even-numbered pixels, there is no difference in luminance characteristics between the odd-numbered pixels and the even-numbered pixels. Therefore, when an image is displayed in an interlaced manner, flicker does not occur even when a solid display is performed.

  In the present invention, when the image display is ended, it is stored in which of the odd field and the even field, and when the previous image display is ended in the odd field, It is possible to adopt a configuration in which the current image display is started from the even field, and when the previous image display is ended in the even field, the current image display is started from the odd field. With this configuration, the odd-numbered pixels and the even-numbered pixels are equally driven, and the odd-numbered pixels and the even-numbered pixels have the same degree of microscopic degradation. The difference in luminance characteristics does not occur between the pixels and even-numbered pixels. Therefore, when an image is displayed in an interlaced manner, flicker does not occur even if a solid display is performed.

  In the present invention, the cumulative execution number of the odd field and the cumulative execution number of the even field in the previous image display are stored, and the difference between the cumulative execution number of the odd field and the cumulative execution number of the even field is stored. A configuration may be adopted in which when the predetermined number of times or more is reached, the current or subsequent image display is started from the field with the smaller cumulative number of executions. With this configuration, the odd-numbered pixels and the even-numbered pixels are equally driven, and the odd-numbered pixels and the even-numbered pixels have the same degree of microscopic degradation. The difference in luminance characteristics does not occur between the pixels and even-numbered pixels. Therefore, when an image is displayed in an interlaced manner, flicker does not occur even if a solid display is performed.

  In the present invention, a configuration may be adopted in which the field at the start of image display is switched between the odd field and the even field each time image display is performed once or a plurality of times. With this configuration, the odd-numbered pixels and the even-numbered pixels are equally driven, and the odd-numbered pixels and the even-numbered pixels have the same degree of microscopic degradation. The difference in luminance characteristics does not occur between the pixels and even-numbered pixels. Therefore, when an image is displayed in an interlaced manner, flicker does not occur even if a solid display is performed.

  In the present invention, when the image display is finished, the number of scanning lines in which of the odd field and the even field is stored and stored, and when performing the current image display, It is preferable that the driving for the scanning line is started from the driving for the scanning line next to the scanning line that was completed in the previous image display. With this configuration, the odd-numbered pixels and the even-numbered pixels are equally driven, and the odd-numbered pixels and the even-numbered pixels have the same degree of microscopic degradation. The difference in luminance characteristics does not occur between the pixels and even-numbered pixels. Therefore, when an image is displayed in an interlaced manner, flicker does not occur even if a solid display is performed. In addition, since the number of times of driving is equal in the pixels in the odd rows and the pixels in the even rows, the degree of microscopic degradation is equal in all the pixels, and the luminance characteristics are equal in all the pixels. Therefore, a high quality image can be displayed.

  In another aspect of the present invention, in an image display unit in which a plurality of pixels are arranged corresponding to the intersection of a plurality of scanning lines and a plurality of data lines extending in directions intersecting each other, the plurality of scanning lines Among them, in the control method of an electro-optical device that alternately displays an odd field for sequentially driving odd-numbered scanning lines and an even field for sequentially driving even-numbered scanning lines to display an image in an interlaced manner, The image display is terminated in a field opposite to the field when the image display is started among the even fields.

  In the present invention, since the odd-numbered pixels and the even-numbered pixels are driven at equal times, the odd-numbered pixels and the even-numbered pixels have the same degree of microscopic deterioration. And a difference in luminance characteristics does not occur between pixels in even rows. Therefore, when an image is displayed in an interlaced manner, flicker does not occur even if a solid display is performed.

  The control method according to the present invention can be implemented by an electro-optical device having the following configuration. That is, in the present invention, in the image display unit in which a plurality of pixels are arranged corresponding to the intersections of the plurality of scanning lines and the plurality of data lines extending in the directions intersecting each other, the control is performed by the interlace control unit. An electro-optical device that displays an image in an interlaced manner by alternately performing odd fields for driving odd-numbered scanning lines and even-numbered fields for driving even-numbered scanning lines among the plurality of scanning lines. The race control unit selects a field for starting the image display or a field for ending the image display so as to compress the difference between the cumulative execution count of the odd field and the cumulative execution count of the even field. A field selection unit is provided.

  In the present invention, since the odd-numbered pixels and the even-numbered pixels are driven at equal times, the odd-numbered pixels and the even-numbered pixels have the same degree of microscopic deterioration. And a difference in luminance characteristics does not occur between pixels in even rows. Therefore, when an image is displayed in an interlaced manner, flicker does not occur even if a solid display is performed.

  The electro-optical device to which the present invention is applied is configured as, for example, a liquid crystal device or an organic EL device. According to the present invention, even when alternating current is employed in a liquid crystal device, it is possible to prevent a difference in luminance characteristics from occurring between odd-numbered pixels and even-numbered pixels due to cumulative stress of a DC component applied to the pixels. it can. In addition, in an organic EL device, a difference in luminance characteristics occurs between pixels in odd rows and pixels in even rows due to accumulation of thermal stress on the organic EL elements due to energization time and current level. Can be prevented.

  The electro-optical device to which the present invention is applied is used in electronic devices such as personal computers, mobile phones, and projection display devices.

  Hereinafter, embodiments of the present invention will be described, but before that, a configuration of a liquid crystal device common to the respective embodiments will be described. Note that in a thin film transistor used as a pixel transistor, a source and a drain are interchanged depending on an applied voltage. However, in the following description, for convenience of explanation, a side to which a pixel electrode is connected will be described as a drain.

(Configuration of liquid crystal device to which the present invention is applied)
FIG. 1 is a block diagram showing an electrical configuration of an electro-optical device (liquid crystal device) to which the present invention is applied. An electro-optical device 100 shown in FIG. 1 is a liquid crystal device, and has a configuration in which liquid crystal is held between a pair of substrates (an element substrate and a counter substrate). In the electro-optical device 100, the image display area 10 includes a plurality of pixels 11 at positions corresponding to the intersections of the plurality of scanning lines 3 and the plurality of data lines 6 extending in the X direction and the Y direction that intersect each other. Is formed. Each of the plurality of pixels 11 is formed with a pixel switching thin film transistor 12 (pixel transistor) for controlling the pixel electrode.

  For the image display region 10, a scanning line driving circuit (odd scanning line driving) connected to the scanning line 3 by a driving circuit formed on the element substrate, a driving IC mounted on the element substrate, or the like. The circuit 31 and the even-number scanning line driving circuit 32) and the data line driving circuit 40 connected to the data line 6 are configured. The data line 6 is electrically connected to the source of the thin film transistor 12, and the data line driving circuit 40 supplies an image signal to the data line 6 in a line sequential manner. The scanning line 3 is electrically connected to the gate of the thin film transistor 12, and the scanning line driving circuit (the odd-numbered scanning line driving circuit 31 and the even-numbered scanning line driving circuit 32) sequentially applies the scanning signal to the scanning line 3. Supply with. The pixel electrode is electrically connected to the drain of the thin film transistor 12. In the electro-optical device 100, the image signal supplied from the data line 6 is received by turning on the thin film transistor 12 for a certain period by a scanning signal. Data is written into the liquid crystal capacitor 14 of each pixel 11 at a predetermined timing. An image signal of a predetermined level written in the liquid crystal capacitor 14 is held for a certain period between the pixel electrode and the common electrode formed on the counter substrate or the element substrate. The liquid crystal capacitor 14 has a configuration in which a holding capacitor 13 is connected in parallel. In this embodiment, when the storage capacitor 13 is configured, the capacitor line 4 is formed so as to be parallel to the scanning line 3. However, the storage capacitor 13 may be formed between the storage line 13 and the preceding scanning line 3. Note that the capacitor line 4 is normally held at a common potential.

  In the electro-optical device 100 configured as described above, in this embodiment, an image is displayed in an interlaced manner. For this reason, among the plurality of scanning lines 3, the odd-numbered scanning lines 3 from the top are connected to the odd-numbered scanning line driving circuit 31, and the scanning signals are sequentially supplied from the odd-numbered scanning line driving circuit 31. Further, the even-numbered scanning lines 3 from the top are connected to the even-numbered scanning line driving circuit 32, and the scanning signals are sequentially supplied from the even-numbered scanning line driving circuit 32.

  Each of the odd-numbered scan line drive circuit 31 and the even-numbered scan line drive circuit 32 has start pulses (first start pulse SPv1, second start pulse SPv2) output from the synchronization control circuit 51 of the interlace control unit 50, And shift registers 31a and 32a for generating signals based on the shift clock CKv, and output circuits 31b and 32b for boosting the signals output from the shift registers 31a and 32a and outputting them as scanning signals to the scanning lines 3. I have. The output circuits 31b and 32b are composed of a level shifter circuit and a buffer circuit.

  The data line driving circuit 40 includes a shift register 40a that generates a selection pulse based on the start pulse SPh output from the synchronization control circuit 51 and the shift clock CKh, a sample hold circuit 40b, and an output circuit 40c. The sample hold circuit 40b samples and holds the image signal RGB in response to the selection pulse.

(Configuration of interlace control unit 50)
In the electro-optical device 100 configured as above, in this embodiment, the pixels 11 corresponding to the odd-numbered scanning lines 3 (odd-numbered pixels 11) and the pixels 11 corresponding to the even-numbered scanning lines 3 (even-numbered rows). By equalizing the number of times the pixels 11) are driven, the degree of microscopic deterioration between the odd-numbered pixels 11 and the even-numbered pixels 11 is made equal, and flickering is prevented. Therefore, in the electro-optical device 100 of the present embodiment, the interlace control unit 50 includes a field selection unit 53 including a storage unit 530, and the field selection unit 53 will be described below for each embodiment. The field at which image display is started or the image display is terminated so as to compress the difference between the cumulative execution number of the odd field in which the odd field is executed and the cumulative execution number of the even field in which the even field is executed. Select the field.

  In any of the embodiments described below, a signal ON indicating that image display should be started based on an external switch operation and a signal indicating that image display should be ended based on an external switch operation OFF is input to the interlace control unit 50, and on the basis of the signal input, start of image display and end of image display are executed. In any of the embodiments described below, the polarity of the voltage applied to the liquid crystal capacitor 14 is inverted for each field.

[Embodiment 1]
FIG. 2 is an explanatory diagram illustrating a method for controlling the electro-optical device according to the first embodiment of the invention. In the electro-optical device 100 according to the present embodiment, when the image display is ended, the field selection unit 53 illustrated in FIG. 1 stores, in the storage unit 530, which field is ended among the odd field and the even field. When the last image display is finished in the odd field, the current image display is started from the even field. When the previous image display is finished in the even field, the current image display is started from the odd field. Start with

  More specifically, in the electro-optical device 100 according to the present embodiment, as shown in FIG. 2A, first, when an image ON signal indicating display ON is input based on an external operation, image display is performed. When the synchronization control circuit 51 of the interlace control unit 50 outputs the first start pulse SPv1 to the odd-numbered operation line drive circuit 31, the odd-numbered operation line drive circuit 31 outputs a scanning signal to the odd-numbered scanning lines 3. Are output sequentially. As a result, image signals are sequentially input from the data lines 6 to the pixels 11 in the odd rows, and odd fields are executed. Next, when the synchronization control circuit 51 outputs the second start pulse SPv2 to the even-numbered operation line driving circuit 32, scanning signals are sequentially output from the even-numbered operation line driving circuit 32 to the even-numbered scanning lines 3. The As a result, image signals are sequentially input from the data lines 6 to the pixels 11 in the even rows, and the even field is executed. In this way, an image for one frame is displayed. Such an operation is repeatedly executed, and an image corresponding to the image signal is displayed in an interlaced manner in the image display area 10.

  While the display is being performed, for example, when the display OFF signal OFF is input and the image display is terminated at time t11, the synchronization control circuit 51 causes the odd-numbered operation line drive circuit 31 to perform the first start. After outputting the pulse SPv1, the second start pulse SPv2 is not output to the even-numbered operation line drive circuit 32. For this reason, the image display ends in the odd field. Such a result is stored in the storage unit 530.

  After that, when the display ON signal ON is input and the image display is performed again, the storage unit 530 stores that it ended in the odd field at the time of the previous image display. The control circuit 51 is instructed to output the second start pulse SPv2 to the even-numbered operation line drive circuit 32. As a result, the current image display is started from the even field as shown in FIG. Thereafter, odd fields and even fields are executed alternately.

  On the other hand, for example, at the time t12 shown in FIG. 2A, when the display OFF signal OFF is input and the image display is terminated, the synchronization control circuit 51 causes the even-numbered operation line drive circuit 32 to After the second start pulse SPv2 is output, the first start pulse SPv1 is not output to the odd-numbered operation line drive circuit 31. For this reason, the image display ends in the even field. Such a result is stored in the storage unit 530.

  After that, when the display ON signal ON is input and image display is performed again, the storage unit 530 stores that the last image display is completed in the even field, so the field selection unit 53 is synchronized. The control circuit 51 is instructed to output the first start pulse SPv1 to the odd-numbered operation line drive circuit 31. As a result, when the current image display is performed, as shown in FIG. 2B, the odd field is started, and thereafter, the odd field and the even field are alternately executed.

  Such an operation is subsequently performed every time the image display is started and ended. Therefore, thereafter, even when the image display ends in either the odd field or the even field, the difference between the cumulative number of executions of the odd field and the cumulative number of executions of the even field can be compressed. Therefore, the number of times the pixels 11 corresponding to the odd-numbered scanning lines 3 (odd-numbered pixels 11) and the pixels 11 corresponding to the even-numbered scanning lines 3 (even-numbered pixels 11) are driven is equal. Since the odd-numbered pixels 11 and the even-numbered pixels 11 have the same degree of microscopic deterioration due to the residual charge of the DC component on the liquid crystal, the odd-numbered pixels 11 and the even-numbered pixels 11 There is no difference in luminance characteristics between them. Therefore, when the interlace method is employed, flicker does not occur even when solid display is performed.

[Embodiment 2]
FIG. 3 is an explanatory diagram illustrating a method for controlling the electro-optical device according to the second embodiment of the present invention. In the first embodiment, every time image display is performed, the field in which the current image display is to be started is selected based on which field the previous image display has ended. In the embodiment, in the field selection unit 53 shown in FIG. 1, the cumulative number of executions of the odd field and the cumulative number of executions of the even field in the previous image display are stored in the recording unit 530. When the difference from the cumulative execution count of the field is equal to or greater than a predetermined set value, the current or subsequent image display is started from the field with the smaller cumulative execution count.

  More specifically, in the electro-optical device 100 of this embodiment, first, as shown in FIG. 3A, image display is started from an odd field. Then, when the image display is finished in the odd field and the image display is finished in the even field, the next image display starts from the odd field as shown in FIG. To do. Such an operation is continued for the time being. However, the recording unit 530 stores the cumulative number of executions in the odd field and the cumulative number of executions in the even field, or the difference between the cumulative number of executions in the odd field and the cumulative number of executions in the even field.

  The field selection unit 53 checks the stored contents in the storage unit 530 every time an image is displayed, and until the difference between the cumulative number of executions of the odd field and the cumulative number of executions of the even field exceeds the set value. As shown in FIG. 3B, the image display is started from the odd field.

  On the other hand, when the present image display is performed, as a result of confirming the storage contents in the storage unit 530, the difference between the cumulative execution count of the odd field and the cumulative execution count of the even field is greater than or equal to the set value. In this case, as shown in FIG. 3C, the current image display starts from the even field. Such image display from the even field is performed once or a plurality of times. As a result, the difference between the cumulative execution count of the odd field and the cumulative execution count of the even field is compressed. If the number of times of image display from the even field is equal to the set value, it is possible to return to the state where the cumulative number of executions in the odd field and the cumulative number of executions in the even field are the same.

  As described above, in this embodiment, the number of times the pixels 11 corresponding to the odd-numbered scanning lines 3 (odd-numbered pixels 11) and the pixels 11 corresponding to the even-numbered scanning lines 3 (even-numbered pixels 11) are driven. Therefore, the odd-numbered pixels 11 and the even-numbered pixels 11 have the same degree of microscopic deterioration due to the residual charge of the DC component on the liquid crystal. Therefore, there is no difference in luminance characteristics between the pixels 11 in the odd rows and the pixels 11 in the even rows, so that flicker does not occur even if the solid display is performed when the image is displayed interlaced.

[Embodiment 3]
FIG. 4 is an explanatory diagram illustrating a control method for the electro-optical device according to the third embodiment of the present invention. In the first and second embodiments, the field in which the current image display is to be started is selected based on the field in which the previous image display is completed. In the present embodiment, the field shown in FIG. Whether the selection unit 53 starts from the odd field or the even field in the previous image display, regardless of whether it ended in the odd field or the even field in the previous or previous image display. Is stored in the recording unit 530, and when the current image display is performed, the field is started from the opposite field to the previous image display.

  More specifically, in the electro-optical device 100 of the present embodiment, as shown in FIG. 4A, first, in the odd-numbered image display, a signal indicating that the display is turned off from the outside starts from the odd field. The image display is terminated when OFF is input.

  Then, when performing the current display (even-numbered image display), as shown in FIG. 4B, regardless of whether the previous image display ended in the odd field or the even field, The image display is started from the opposite field, that is, the even field.

  Even in this configuration, the pixels 11 corresponding to the odd-numbered scanning lines 3 (odd-row pixels 11) and the pixels 11 corresponding to the even-numbered scanning lines 3 (even-numbered pixels 11) are driven. Since the number of times can be equalized, the odd-numbered pixels 11 and the even-numbered pixels 11 have the same degree of microscopic deterioration due to the residual charge of the DC component on the liquid crystal. Therefore, there is no difference in luminance characteristics between the pixels 11 in the odd rows and the pixels 11 in the even rows, so that flicker does not occur even if the solid display is performed when the image is displayed interlaced.

[Embodiment 4]
FIG. 5 is an explanatory diagram showing a control method of the electro-optical device according to Embodiment 4 of the present invention. In the first to third embodiments, the number of times of driving between the odd-numbered pixels 11 and the even-numbered pixels 11 is equalized. However, in the present embodiment, the odd-numbered pixels 11 and The number of times of driving each pixel 11 in the pixels 11 in the even rows is equalized. That is, in the present embodiment, when the image display is ended in the field selection unit 53 shown in FIG. 1, the storage unit stores which scanning line 3 in which field of the odd field and the even field has ended. In this case, when the current image display is performed, the driving for the scanning line 3 is started from the driving for the scanning line 3 next to the scanning line 3 which has been completed in the previous image display.

  More specifically, in the electro-optical device 100 of this embodiment, for example, as shown in FIG. 5A, the second scanning line 3 in the even field (the fourth scanning in the entire image display region 10). When the display is finished at line 3), the contents are recorded in the recording unit 530.

  When performing the current image display, as shown in FIG. 5B, the image display is performed from the third scanning line 3 in the even field (the sixth scanning line 3 in the entire image display area 10). Start. Such control can be realized by a configuration in which the gate circuits of the output circuits 31b and 32b shown in FIG. 1 are provided and the output of the scanning signal is stopped until the scanning signal is output to the predetermined scanning line 3. .

  Such an operation is implemented every time an image display is finished and started. For this reason, even when the image display is completed on both the odd-numbered field and even-numbered field scanning lines 3, the difference between the cumulative number of executions of the odd field and the cumulative number of executions of the even field can be compressed. Therefore, the number of times the pixels 11 corresponding to the odd-numbered scanning lines 3 (odd-numbered pixels 11) and the pixels 11 corresponding to the even-numbered scanning lines 3 (even-numbered pixels 11) are driven is equal. Since the odd-numbered pixels 11 and the even-numbered pixels 11 have the same degree of microscopic deterioration due to the residual charge of the DC component on the liquid crystal, the odd-numbered pixels 11 and the even-numbered pixels 11 There is no difference in luminance characteristics between them. Therefore, when an image is displayed in an interlaced manner, flicker does not occur even if a solid display is performed.

  In addition, since the number of times of driving in each pixel 11 is equal in the pixels 11 in the odd rows and in the pixels 11 in the even rows, the degree of microscopic degradation is equal in all the pixels 11, and the luminance is in any pixel. The characteristics are equal. Therefore, according to this embodiment, a high-quality image can be displayed.

[Embodiment 5]
FIG. 6 is an explanatory diagram illustrating a method for controlling the electro-optical device according to the fifth embodiment of the present invention. In the first to fourth embodiments, the number of times of driving between the odd-numbered rows of pixels 11 and the even-numbered rows of pixels 11 is equalized by controlling the field when starting image display. In this embodiment, the number of times of driving between the odd-numbered rows of pixels 11 and the even-numbered rows of pixels 11 is equalized by controlling the field at the end of image display. That is, in this embodiment, the field selection unit 53 shown in FIG. 1 stores in the storage unit 530 whether the field at the start of image display is set to an odd field or an even field, and displays the image. When ending, the image display is ended in a field opposite to the field starting when the image display is performed.

  More specifically, in the electro-optical device 100 according to the present embodiment, as shown in FIG. 6, image display is always started from an odd field, and the display is turned off at any timing of time t11 and time t12. Even when the signal OFF is input, the image display is finished in the even field. For this reason, the cumulative number of executions in the odd field and the cumulative number of executions in the even field can be made the same. Accordingly, the odd-numbered pixels 11 and the even-numbered pixels 11 have the same degree of microscopic deterioration due to the residual charge of the DC component on the liquid crystal, and therefore the odd-numbered pixels 11 and the even-numbered pixels 11 No difference in luminance characteristics occurs between Therefore, when an image is displayed in an interlaced manner, flicker does not occur even if a solid display is performed.

[Application example to organic EL devices]
In the above embodiment, the present invention is applied to a liquid crystal device. However, the present invention may be applied to an organic EL device described below.

  FIG. 7 is a block diagram showing an electrical configuration of an electro-optical device (liquid crystal device) to which the present invention is applied. An electro-optical device 100 illustrated in FIG. 7 is an organic EL device, and the image display region 10 includes a plurality of scanning lines 3, a plurality of data lines 6 extending in a direction intersecting the scanning lines 3, and a scanning line. 3 and a plurality of power supply lines 7 extending in parallel. A plurality of pixels 11 are arranged at positions corresponding to intersections of the plurality of scanning lines 3 and the plurality of data lines 6. A data line driving circuit 40 is connected to the data line 6, and a scanning line driving circuit (an odd number scanning line driving circuit 31 and an even number scanning line driving circuit 32) is connected to the scanning line 3. In each of the image display regions 10, a switching thin film transistor 12 to which a scanning signal is supplied to the gate electrode through the scanning line 3 and a pixel signal supplied from the data line 6 through the switching thin film transistor 12 are received. A holding capacitor 13 to be held, a driving thin film transistor 16 to which a pixel signal held by the holding capacitor 13 is supplied to the gate electrode, and the power line 7 when electrically connected to the power line 7 through the thin film transistor 16 A pixel electrode (anode layer) into which a drive current flows from and an organic EL element 15 in which an organic functional layer is sandwiched between the pixel electrode and the cathode layer.

  According to such a configuration, when the scanning line 3 is driven and the switching thin film transistor 12 is turned on, the potential of the data line 6 at that time is held in the holding capacitor 13, and according to the charge held in the holding capacitor 13, The on / off state of the driving thin film transistor 16 is determined. Then, a current flows from the power supply line 7 to the pixel electrode through the channel of the driving thin film transistor 16, and further a current flows to the counter electrode layer through the organic functional layer. As a result, the organic EL element 15 emits light according to the amount of current flowing therethrough.

  In the configuration shown in FIG. 7, the power supply line 7 is in parallel with the scanning line 3, but a configuration in which the power supply line 7 is in parallel with the data line 6 may be adopted. In the configuration shown in FIG. 7, the storage capacitor 13 is configured using the power supply line 7. However, a capacitor line may be formed separately from the power supply line 7, and the storage capacitor 13 may be configured using the capacitor line. Good.

  Also in the electro-optical device 100 configured as described above, an image is displayed in an interlaced manner, similarly to the electro-optical device 100 (liquid crystal device) described with reference to FIG. For this reason, among the plurality of scanning lines 3, the odd-numbered scanning lines 3 from the top are connected to the odd-numbered scanning line driving circuit 31, and the scanning signals are sequentially supplied from the odd-numbered scanning line driving circuit 31. Further, the even-numbered scanning lines 3 from the top are connected to the even-numbered scanning line driving circuit 32, and the scanning signals are sequentially supplied from the even-numbered scanning line driving circuit 32. Further, the odd-numbered scan line drive circuit 31 and the even-numbered scan line drive circuit 32 each have a start pulse (first start pulse SPv1, second start pulse SPv2) output from the synchronization control circuit 51 of the interlace control unit 50. ), And shift registers 31a and 32a that generate signals based on the shift clock CKv, and output circuits 31b and 32b. The data line driving circuit 40 includes a shift register 40a that generates a selection pulse based on the start pulse SPh output from the synchronization control circuit 51 and the shift clock CKh, a sample hold circuit 40b, and an output circuit 40c. The sample hold circuit 40b samples and holds the image signal RGB in response to the selection pulse.

  Also in the electro-optical device 100 configured as described above, the control method described with reference to FIGS. 2 to 6 is employed, and the pixels 11 corresponding to the odd-numbered scanning lines 3 (odd-numbered pixels 11); The number of times that the pixels 11 corresponding to the even-numbered scanning lines 3 (even-row pixels 11) are driven is equalized. Accordingly, since the degree of microscopic degradation between the pixels 11 in the odd rows and the pixels 11 in the even rows can be made equal, the occurrence of flicker can be prevented.

[Example of mounting on electronic equipment]
With reference to FIG. 8, an electronic apparatus in which the above-described electro-optical device 100 is mounted will be described. FIG. 8A illustrates a configuration of a mobile personal computer including the electro-optical device 100. The personal computer 2000 includes an electro-optical device 100 as a display unit and a main body 2010. The main body 2010 is provided with a power switch 2001 and a keyboard 2002. FIG. 8B shows the configuration of a mobile phone provided with the electro-optical device 100. A cellular phone 3000 includes a plurality of operation buttons 3001, scroll buttons 3002, and the electro-optical device 100 as a display unit. By operating the scroll button 3002, the screen displayed on the electro-optical device 100 is scrolled. FIG. 6C shows the configuration of a personal digital assistant (PDA) to which the electro-optical device 100 is applied. The information portable terminal 4000 includes a plurality of operation buttons 4001, a power switch 4002, and the electro-optical device 100 as a display unit. When the power switch 4002 is operated, various types of information such as an address book and a schedule book are displayed on the electro-optical device 100.

  As an electronic apparatus on which the electro-optical device 100 is mounted, in addition to the one shown in FIG. 8, a digital still camera, a liquid crystal television, a viewfinder type, a monitor direct view type video tape recorder, a car navigation device, a pager, an electronic notebook, Examples include calculators, word processors, workstations, videophones, POS terminals, devices with touch panels, and the like. The electro-optical device 100 described above can be applied as a display unit of these various electronic devices.

1 is a block diagram showing an electrical configuration of an electro-optical device (liquid crystal device) to which the present invention is applied. FIG. 6 is an explanatory diagram illustrating a control method for the electro-optical device according to the first embodiment of the invention. FIG. 6 is an explanatory diagram illustrating a control method for an electro-optical device according to a second embodiment of the invention. FIG. 10 is an explanatory diagram illustrating a control method for an electro-optical device according to a third embodiment of the invention. FIG. 10 is an explanatory diagram illustrating a control method for an electro-optical device according to a fourth embodiment of the invention. FIG. 10 is an explanatory diagram illustrating a control method for an electro-optical device according to a fifth embodiment of the invention. 1 is a block diagram illustrating an electrical configuration of an electro-optical device (organic EL device) to which the present invention is applied. It is explanatory drawing of the electronic device using the liquid crystal device which concerns on this invention. It is explanatory drawing which shows the problem of the conventional electro-optical apparatus.

Explanation of symbols

3 .... Scanning line, 6 .... Data line, 10 .... Image display area, 11..Pixel, 31..Scanning line driving circuit for odd number, 32..Scanning line driving circuit for even number, 40..Data line driving Circuit, 50 ... Interlace control unit, 51 ... Synchronous control circuit, 53 ... Field selection unit, 100 ... Electro-optical device

Claims (9)

In an image display unit in which a plurality of pixels are arranged corresponding to the intersection of a plurality of scanning lines and a plurality of data lines extending in a direction intersecting each other, an odd number of scanning lines among the plurality of scanning lines are In an electro-optical device control method for interlaced display of images by alternately performing odd-numbered fields that are sequentially driven and even-numbered fields that are sequentially driven even-numbered scanning lines.
The field at the start of image display is switched between the odd field and the even field so as to compress the difference between the cumulative execution count of the odd field and the cumulative execution count of the even field. Control method of electro-optical device. When the image display is finished, it is stored in which of the odd field and the even field,
In the previous image display, when the odd field ends, the current image display starts from the even field,
2. The method of controlling the electro-optical device according to claim 1, wherein, when the previous image display is completed in the even field, the current image display is started from the odd field. Store the cumulative execution count of the odd field and the cumulative execution count of the even field until the previous image display,
When the difference between the cumulative number of executions of the odd field and the cumulative number of executions of the even field is equal to or greater than a predetermined number, the current or subsequent image display is started from the field with the smaller cumulative number of executions. The method of controlling an electro-optical device according to claim 1.   2. The method of controlling an electro-optical device according to claim 1, wherein a field for starting image display is switched between the odd field and the even field every time image display is performed once or a plurality of times. . When the image display is terminated, the number of scanning lines in which field of the odd field and the even field is stored and stored.
2. The control of the electro-optical device according to claim 1, wherein when performing the current image display, the driving for the scanning line is started from the driving for the scanning line next to the scanning line ended in the previous image display. Method. In an image display unit in which a plurality of pixels are arranged corresponding to the intersection of a plurality of scanning lines and a plurality of data lines extending in a direction intersecting each other, an odd number of scanning lines among the plurality of scanning lines are In an electro-optical device control method for interlaced display of images by alternately performing odd-numbered fields that are sequentially driven and even-numbered fields that are sequentially driven even-numbered scanning lines.
An electro-optical device control method comprising: ending image display in a field opposite to a field when image display is started among the odd field and the even field.   An electro-optical device, wherein the control method according to claim 1 is performed. In the image display unit in which a plurality of pixels are arranged corresponding to the intersection of a plurality of scanning lines and a plurality of data lines extending in a direction intersecting with each other, the plurality of scanning lines are controlled by an interlace control unit. Among them, in an electro-optical device that displays an interlaced image by alternately performing an odd field for driving an odd-numbered scanning line and an even-numbered field for driving an even-numbered scanning line,
The interlace control unit may select a field for starting image display or a field for ending image display so as to compress a difference between the cumulative execution count of the odd field and the cumulative execution count of the even field. An electro-optical device comprising a field selection unit for selection.   An electronic apparatus comprising the electro-optical device according to claim 7.

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