JP2003036047A - Method for driving display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for driving a display device which is reduced in flickering. SOLUTION: A method for driving a display device having a plurality of scanning areas in which a display element is disposed on each of intersection points of signal lines and scanning lines, wherein each scanning area is drive line sequentially for display, the difference of scanning timing between two scanning lines which are adjacent in parallel beyond the boundary between each scanning area is one millisecond or more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving method of a display device which can be used in the fields of display devices, flat panel displays, backlights, interiors, etc., and more particularly to organic electroluminescent devices arranged in a matrix. And a driving method of a display device having a plurality of.

[0002]

2. Description of the Related Art In recent years, attention has been paid to an organic electroluminescent device as one of new light emitting display devices. This device (see FIG. 2) emits light when holes injected from the anode and electrons injected from the cathode are recombined in the organic light emitting layer sandwiched between the both electrodes, and the device emits light at a low voltage. Luminous emission was first shown by CW Tang et al. Of Kodak Company (Appl. Phys. Lett. 51 (12) 21, pp.913, 198).
7).

The organic electroluminescent device is thin and can emit high brightness light under low voltage driving and multicolor light emission by selecting an organic light emitting material, and its application to a display device or a display has been actively studied. In particular, a simple matrix type display has a simple structure and has been attracting attention from the viewpoint of cost.

As a method for selecting the scanning lines of the display, there are a non-interlace method for sequentially selecting each scanning line and an interlace method for selecting every other line.

Since the interlace system can reduce the frame frequency by half as compared with the non-interlace system in which all scanning lines are sequentially scanned, the power consumption due to switching can be reduced and the ratio of rise time of signal input due to constant current driving can be reduced. . In particular, the interlaced scanning method is suitable for displaying a moving image.

By the way, in a simple matrix type display, if the frame frequency is constant, the scanning line selection period (proportional to the duty ratio (= 1 scanning line selection period / one frame scanning period)) is the number of scanning lines. It has the drawback of being decided by. That is, if the number of scanning lines is large, the selection period per scanning becomes short accordingly, and in order to obtain sufficient brightness in such a short light emission time, it is necessary to flow a larger current. Excessive current is not preferable because it accelerates the life and deterioration of the organic light emitting device. In addition, when the panel becomes large-sized or has high definition, the wiring resistance becomes large and uneven brightness in the plane of the panel occurs.

In order to address these drawbacks, for example, in the method disclosed in Japanese Unexamined Patent Publication No. 2000-29432, it is considered to divide a signal line or a scanning line into a plurality (see FIG. 1). In this method, by dividing the signal line and providing a plurality of scanning areas, different display signals can be supplied to the respective areas, and the duty ratio can be increased according to the number of divisions. Moreover, since the wiring resistance can be reduced, it is possible to reduce the uneven brightness.

However, this method has a problem that flicker is felt near the boundary of the scanning area.

[0009]

SUMMARY OF THE INVENTION The present invention solves such a problem, and in a display device having a plurality of scanning areas, particularly when displaying an image by interlaced scanning, flicker occurring at a boundary portion is reduced to deteriorate image quality. It is an object to provide a driving method capable of preventing the above.

[0010]

That is, according to the present invention, in a display device having a plurality of scanning areas in which display elements are arranged at respective intersections of signal lines and scanning lines, each area is line-sequentially driven for display. In the method, a display device driving method is characterized in that a difference in scanning timing between scanning lines that are in contact with each other in parallel with the boundary of each region is set to 1 millisecond or more.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a driving method according to the present invention will be described below.

The display device driving method of the present invention is practical in the interlace system. In particular, the display device is preferably implemented in a simple matrix type display, and an organic electroluminescent element is preferably used as the element in the display. In the following, a simple matrix type display will be exclusively used as a display device, and an organic electroluminescent element will be used as an example of a light emitting element.
The present invention will now be described but is not limited in any way.

FIG. 2 is a cross-sectional view showing a typical structure of an organic electroluminescence device that is preferably used in the present invention. A hole transport layer (preferably a triphenyldiamine derivative or the like) is formed on a transparent anode (preferably indium tin oxide (ITO)) 22 formed on a transparent insulating substrate (preferably a glass substrate) 21.
23, organic light emitting layer (preferably tris (8-quinolinato))
An aluminum complex, etc.) 24, and a cathode (preferably inexpensive and also serving as a reflection layer) 25 are laminated, and the driving source 2
Light emission generated by driving by 6 is taken out through the anode and the transparent insulating substrate. In order to facilitate injection of electrons, an electron transport layer may be provided between the organic light emitting layer and the cathode. Alternatively, only the electron transport layer on the cathode side may be arranged without using the hole transport layer. The light emitting element has a rectifying property that a current flows when the anode has a positive polarity (forward bias direction) and emits light, and almost no current flows when the cathode has a positive polarity (reverse bias direction). There is no limitation on which side the anode (cathode) is provided as long as it matches the rectifying direction of the light emitting element, but ITO, which is preferably used for the transparent electrode, is preferably used as the anode because of its physical properties. Therefore, when light is emitted from the opposite surface of the transparent substrate, it is necessary to stack the elements in the reverse order so that ITO is on the light emitting surface side.

FIG. 3 is an example of an equivalent circuit showing a simple matrix type display device using the organic electroluminescent element preferably used in the present invention. m × n organic electroluminescent elements 3
7 (EL) is arranged at the electrical intersection of the n signal lines 31 and the m scanning lines 32. That is, in the present invention, the fact that the display element is arranged at each intersection of the signal line and the scanning line means an electrical intersection, and is not necessarily limited to an exact intersection on the physical and geometrical form of the element. Not something
As shown in FIG. 3, the display element is electrically connected to the signal line and the scanning line in the vicinity of the geometrical intersection (a range that does not exceed the adjacent intersection), and the display function is exhibited by the electrical action of both lines. As far as it is limited, it is not limited. The signal line 31 and the scanning line 32 are connected via a signal line switch 33 (DSW) and a scanning line switch 34 (SSW), respectively.
Drive source 35 and reference potential (generally ground),
The reverse bias voltage source 36 is switching-connected to the reference potential. The voltage value of the reverse bias voltage source is larger than the reference potential and is set to a value similar to the drive source voltage. The signal line 31 corresponds to the anode of the light emitting element, and the scanning line 32 corresponds to the cathode.

In such a display device, each light emitting element can emit light in a desired pattern by line-sequential driving, for example. In FIG. 3, the light emitting element ELi, j (1 ≦ i ≦
m, 1 ≦ j ≦ n), only the scanning line SSWi is connected to the reference potential and all the other scanning lines are connected to the reverse bias (Vs). At this time, the DSWj is connected to the drive source and the signal current is input in synchronization with the scanning line. The signal current flows forward only in the light emitting element ELi, j due to the reverse bias of the scanning line, and emits light. When a plurality of elements on the selected scanning line are made to emit light, a signal current is simultaneously given from a plurality of signal lines corresponding to the light emitting pixels. To express the gradation, the magnitude of the signal current applied to the light emitting element or the time for applying the signal may be modulated. By repeating the above selection operation at high speed for all scanning lines, it is possible to display an image by causing any combination of light emitting elements to emit light due to the afterimage effect.

The driving method of the present invention exhibits its effect in the interlace system. The interlace method is, for example, as shown in FIG. 4, N scan lines of one screen, that is, one frame is divided into two fields of an odd line and an even line, and N / 2 scans are performed. Only odd lines are scanned in the first field ((a) of FIG. 4) and only even lines are scanned in the second field ((b) of FIG. 4).

However, as a method for improving the interlace method, in the conventional technique in which the signal lines are divided and a plurality of scanning regions are provided to supply different display signals to the respective regions, the divided regions are interlaced scanned. When driven by using, there is a problem that flicker occurs in a portion in contact with the boundary. As a result of studying the problem, a difference in scanning timing (scan line a,
scan line a (or b) when b is adjacent
(The period from the selection and emission of light to the selection of the scanning line b (or a) and emission of light. Hereinafter, in addition to the difference in scanning timing, it may be simply referred to as a timing difference.)
Was found to be significantly different from other adjacent scan lines.

FIG. 1 shows an example of a panel in which a signal line is divided into upper and lower parts with respect to a scanning line. Since the upper and lower panels are independent from each other in terms of electric signals, it is possible to simultaneously emit two lines. FIG. 5 shows a scanning order when light is emitted by interlaced scanning in the conventional technique using the panel of FIG. The shaded portions in the figure are the scanning lines selected for display.
At this time, in the first field (FIGS. 5 (1) to (4)), the scanning lines at the uppermost ends of the upper and lower panels are first selected.
The odd-numbered scan lines are sequentially selected. In the second field (FIGS. 5 (5) to 5 (8)), the even-numbered scan lines of the upper and lower panels are selected, and the bottom edges of the upper and lower panels are selected last. As a result, when switching from (8) to (1), the two lines that are in parallel and in contact with the borders of the upper and lower panels (the lowermost scan line of the upper panel-> the uppermost scan line of the lower panel)
However, it can be seen that light is continuously emitted with a difference of one scanning period T. On the other hand, in each area, two consecutive lines emit light in a half cycle F (= T × total number of scanning lines / 2 / area number) of one frame for each field. The present inventors have found that the nonuniformity (T, F) in the difference in the timing of light emission of two consecutive lines causes flicker. That is, since one scanning period T is too short,
The scanning lines that are in parallel contact with the boundary portions of the adjacent display areas appear to emit light at the same time, while the half cycle F has a long time interval, and thus emits light at the same time. As described above, the adjacent scanning lines are recognized as emitting light unevenly as compared with the other scanning lines due to the difference, and flicker is recognized.

In contrast to the driving method of the prior art, in the present invention, one having a shorter switching interval between the adjacent scanning lines in parallel (for example, the uppermost panel lowermost scanning line is a and the lower panel uppermost scanning line is b is the scanning line selection order a-> b, b
When the time interval of-> a is Bab and Bba respectively, B
If ab <Bba, the drive method is controlled so that Bab corresponds to this, hereinafter referred to as minimum boundary switching interval B) is sufficiently larger than T and is 1 ms or more (preferably 2 ms or more, more preferably 4 ms or more). Is what you are doing. Alternatively, the minimum boundary switching interval B
The value (B / F) obtained by dividing by half period F is substantially close to 1 (preferably 1/4 or more, more preferably 1 /
2 or more, more preferably 3/4 or more).

A concrete method for realizing the above is not particularly limited, but the following method can be adopted, for example.

First, in order to show an example of the driving method in the present invention, a display device in which a signal line as shown in FIG. 1 is equally divided into upper and lower parts and organic electroluminescent elements are arranged in a matrix (the device itself is a conventional technique). (Almost the same as). The light emitting display portions 11 and 12 are provided with the signal line drive circuit 1 above and below.
3 and 14 and the scanning line drive circuits 15 and 16.

The operation of performing pattern display by interlaced scanning according to the driving method of the present invention will be described with reference to FIGS. For simplicity, consider a panel consisting of 8 scan lines each at the top and bottom. The shaded area in the figure indicates the selected scan line, and the blank area indicates the non-selected area.

The scanning line for starting the scanning is not particularly limited, but it is considered that the scanning is started from the uppermost end of the upper panel (FIG. 6 (1)). At this time, the scanning line of the lower panel does not start from the same top end as the upper panel, but the selection operation is performed from the second scanning line in synchronization with the scanning of the upper panel. In the next scan (2), the upper panel selects the third scanning line, and the lower panel selects the fourth scanning line.
That is, the upper panel scans the first field (odd field) and the lower panel scans the second field (even field) (FIGS. 6 (1) to 6 (4)). 1
After scanning the field, this time the second panel on the top panel
The field is scanned, and the first panel is scanned on the lower panel (FIGS. 6 (5) to (8)). For example, assuming that the frequency of one frame is 30 Hz, the period required for scanning one field is (1/30) × (1/2) = about 16.7 ms, and the selection period per scanning line is (1 / 30) x (1
/ 8) = about 4.2 ms. Here, the difference in timing of selecting continuous scanning lines in each area is 16.7 ms, which is equal to the scanning period of one field. Looking at the boundary part between the upper and lower panels, that is, the minimum boundary switching interval B, which is the difference in the timing of switching from the lowermost end of the upper panel to the uppermost end of the lower panel, it is approximately 12.5 ms (= half It can be seen that the period is F-scanning period T). On the other hand, in the case of the conventional technique in which the upper and lower panels are scanned in the same order, the time becomes 4.2 ms, and significant nonuniformity occurs in the difference in selection timing.

FIG. 7 shows the order in which the scanning lines are selected. As in the case of interlaced scanning of the entire panel, the scanning order is continuous. That is, the odd line selection order is 1,2,3,4,5,6,7,8,1,2,3,4, ... from the top, and the even line selection order is 5,6. , 7,8,1,2,3,4,5,6,7,8,
It has become. Further, from the viewpoint of reducing the difference between the scanning timing difference at the boundary portion (minimum boundary switching interval B) and the timing difference between other adjacent scanning lines, the scanning order as shown in FIG. 8 is set. May be. That is, in FIG. 8, the bottom panel is scanned from bottom to top, as opposed to the top panel. Although not shown, the upper panel may scan from bottom to top.

Further, in the system shown in FIGS. 6 and 7, the scanning lines selected in the upper and lower panels at the same time are almost always one panel apart ((1) to (4) are separated by one panel). +1 scanning line segment, (5) to (8) has 1 panel portion-1 scanning line segment), which is also preferable for the visual effect.
On the other hand, when interlace scanning is performed in synchronization so that the uppermost scan line of the lower panel is selected when the second scanline from the bottom of the upper panel is selected, the lower and upper edges of the upper panel are selected. Looking at the difference in the scanning timing of the upper edge of the panel (minimum boundary switching interval B), it is exactly 16.7 ms as in the inside of each area, which is preferable in this respect, but it is selected at the same time in the upper and lower panels. The scan lines are not always one panel of distance apart.

By setting the scanning order constituting one frame as described above, it is possible to avoid the flicker due to the nonuniformity of the difference in the timing of the boundary portion due to the division of the panel.

Further, the present driving method can be applied to the case where the signal line is divided into two or more. Also in this case, the order of the fields for scanning each panel may be alternately switched so that the difference in scanning timing at the boundary portion becomes equal to the inside of each region.

The above embodiment is not limited to the electrode configuration, the element configuration, and the signal input modulation method. The degree of flicker varies depending on the brightness and brightness of the screen, the brightness of the surroundings, etc., but in the human cone system, CFF (Critical Flicker Frequenc) that indicates the flicker frequency of light.
Since the limit of y) is approximately 60 to 70 Hz, it is preferable that the frequency of one field is set to this value or higher.
Therefore, the frame frequency needs to be set to 30 Hz or higher. Regarding the pixel size of the panel, the flicker becomes more conspicuous at the divided boundary portions as the pitch in the scanning direction becomes coarser. Therefore, this method is particularly effective for pitches of 10 μ or more.

In addition to the organic electroluminescent display device used in the above description, this driving method is applicable to various simple matrices such as a liquid crystal display, a field emission display (FED), a light emitting diode display (LED), and an inorganic EL. It can also be applied to a type display.

[0030]

The present invention will be described below with reference to examples.
The invention is not limited by these examples.

Example 1 FIG. 9 schematically shows a structural example of an organic electroluminescence device. The manufacturing procedure is as follows.

A glass substrate 41 having a thickness of 1.1 mm with an ITO transparent electrode film having a thickness of 120 nm is 120 × 100 m.
It was cut to a size of m. ITO, which is a transparent electrode, is 90 mm in length and 80 in width by an ordinary photolithography method.
The electrode was patterned into a stripe-shaped electrode of μm. The stripe-shaped first electrode 42 that is this stripe-shaped electrode
Are arranged at a pitch of 100 μm and 816 (3 × 272) pieces are arranged, and are divided into two with a gap of 30 μm in the vertical direction of the stripe from the center. This is the stripe-shaped first electrode 42.
Is used for the signal lines of the upper and lower split type display device, and is thus divided in order to make the drive system independent.

Next, a positive photoresist (OFPR-800 manufactured by Tokyo Ohka Kogyo Co., Ltd.) was applied by a spin coating method to a thickness of 3 μm on the substrate on which the striped first electrodes were formed. The coating film was pattern-exposed through a photomask, developed to pattern the photoresist, and after development, cured at 160 ° C. to form the insulating layer 43. The photomask used for this patterning includes
816 insulating layer openings having a width of 65 μm and a length of 235 μm were arranged in the width direction of the openings at a pitch of 100 μm and in the length direction at a pitch of 300 μm. Then, the bottom of the opening was formed to be the exposed portion of the stripe-shaped first electrode 42.

Next, after fixing to a vacuum vapor deposition machine and evacuating until the degree of vacuum inside the apparatus became 2 × 10 ^-4 Pa or less, while rotating the substrate, copper phthalocyanine was added at 15 nm and bis (N-ethylcarbazole). ) Was vapor-deposited in order of 60 nm to form the hole transport layer 44.

For patterning the light emitting layer, a shadow mask in which a mask portion and a reinforcing line for suppressing the distortion of the mask were formed in the same plane was used. The outer shape of the shadow mask is 120 x 84 mm, and the thickness of the mask part is 25μ.
m, and 272 stripe-shaped openings having a length of 64 mm and a width of 100 μm were arranged at a pitch of 300 μm (3 times the pitch of the stripe-shaped first electrodes). Each stripe opening has a width of 20 μ in the direction orthogonal to the long axis direction of the opening.
Reinforcing lines of m and 25 μm in thickness were formed at intervals of 1.8 mm (there is no problem of patterning on the substrate due to the portion passing through the opening of the reinforcing line). The shadow mask has the same width 4
It was fixed to a mm steel frame.

A shadow mask for patterning the light emitting layer was placed in front of the substrate to bring them into close contact with each other, and a ferrite plate magnet was placed behind the substrate (to fix the mask). At this time, the stripe-shaped first electrode was positioned at the center of the stripe-shaped opening of each shadow mask, the reinforcing wire was positioned on the insulating layer, and the reinforcing wire and the insulating layer were in contact with each other.
In this state, 0.3% by weight of 1,3,5,7,8-pentamethyl 4,4-difluoro-4-bora-3a, 4a-diaza-s
-Indacene- (PM546) -doped Alq
3 (complex consisting of 3 molecules of 8-hydroxyquinoline and 1 atom of aluminum) was vapor-deposited in a thickness of 21 nm to pattern the G emission layer.

Next, the shadow mask is aligned in the same manner as the stripe-shaped first electrode pattern at a position shifted by one pitch (corresponding to the scanning line direction of the display device screen), and 1
Wt% 4- (dicyanomethylene) -2-methyl-6-
Alq3 doped with (jurolydylstyryl) pyran (DCJT) was evaporated to a thickness of 15 nm to pattern the R light emitting layer.

Further, the shadow mask was aligned with the stripe-shaped first electrode pattern at a position shifted by one pitch, and 4,4′-bis (2,2-diphenylvinyl) diphenyl (DPVBi) was evaporated to a thickness of 20 nm, The B light emitting layer was patterned. The R, G, and B light emitting layers 45 are
Every three stripe-shaped first electrodes 42 were arranged so that the exposed portions of the stripe-shaped first electrodes were completely covered.

Next, DPVBi was deposited on the entire surface of the substrate to a thickness of 35 nm and Alq3 was deposited to a thickness of 10 nm. Then, the thin film layer is exposed to lithium vapor for doping (film thickness conversion amount 0.5 nm).
did.

The second electrode 46 was formed by a vacuum evaporation method using a resistance wire heating method. The degree of vacuum during vapor deposition is 3
It was not more than × 10 ^-4 Pa, and the substrate was rotated with respect to two vapor deposition sources during vapor deposition. The outer shape of the shadow mask for the second electrode was 120 × 84 mm, the thickness of the mask portion was 100 μm, and 200 stripe-shaped openings having a length of 100 mm and a width of 250 μm were arranged at a pitch of 300 μm. A mesh-shaped reinforcing wire having a regular hexagonal structure having a width of 40 μm, a thickness of 35 μm, and a space between two opposing sides of 200 μm was formed on the upper portion of the mask. The height of the gap was 100 μm. The shadow mask was fixed to a stainless steel frame before use. Similar to the patterning of the light emitting layer, a shadow mask was placed in front of the substrate to bring them into close contact, and a magnet was placed behind the substrate. At this time, both of them were arranged such that the mask portion was at the position of the insulating layer 43 and the stripe direction was perpendicular to the stripe direction of the stripe-shaped first electrode 42. In this state, aluminum is vapor-deposited to a thickness of 240 nm, and the length is 100 mm and the pitch is 300 μm (Al width 25
0 μm) × 200 striped second electrodes 46 were patterned.

In FIG. 9, the opening of the insulating layer 43 is
Although it seems to be completely buried in the hole transport layer 44 and the organic light emitting layer 45, the insulating layer 43 (3 μm), the hole transport layer 4
4 (15 + 60 nm) and the organic light emitting layer 45 (15-2
Considering the thickness of each layer (1 nm), the opening of the insulating layer 43 is not completely filled with the hole transport layer 44 and the organic light emitting layer 45. The sidewall portion of the recess was slightly inclined so as to be narrowed toward the bottom. The respective layers were also laminated on this slope and formed so as to extend between the openings. However, since the hole transport layer 44 and the organic light emitting layer 45 are thinly laminated and have high electric resistance, it is presumed that the holes are substantially electrically insulated from each other. On the other hand, since the second electrode 46 is thickly laminated and has a low electric resistance, the second electrode 46 is electrically connected in the horizontal direction between the openings.

Thus, the width is 80 μm and the pitch is 100.
4 μm on the ITO striped first electrode of 816
2, a thin film layer 45 including a patterned R light emitting layer, G light emitting layer, and B light emitting layer is formed, and a stripe-shaped second electrode 46 having a width of 250 μm and a pitch of 300 μm is formed so as to be orthogonal to the stripe-shaped first electrode. A simple matrix type color organic electroluminescent device having the above arrangement was manufactured. R, G,
Since the three light emitting regions of B form one pixel, the organic electroluminescent device of the present invention has 272 × 200 pixels at a pitch of 300 μm. Since one light emitting region is regulated by the opening of the insulating layer, the width is 65 μm and the length is 235 μm.

The organic electroluminescent device was taken out of the vapor deposition machine and transferred to an argon atmosphere having a dew point of −70 ° C. or lower. In this low dew point atmosphere, the substrate and the sealing glass plate were bonded together by using a curable epoxy resin for sealing.

In order to drive this display device, since the ITO stripe-shaped first electrode is divided into two, two driving sources were used. An image was displayed on the display device shown in FIG. 1 using the stripe-shaped first electrode as a signal line and the stripe-shaped second electrode as a scanning line. The drive circuits 13 and 14 are constant current sources. A precharge period for charging the floating capacitance at high speed is provided immediately before the signal input, and a reset period for discharging the charge is provided immediately after the signal input. Provided.
The condition of line-sequential driving is that each frame frequency is 30 Hz.
(Interlace method), Duty ratio 1/100. The scanning order of each field was set to be reversed between the upper and lower panels so that the difference in the scanning timing in the portion in contact with the boundary between the upper and lower panels matches the difference in the scanning timing in each area. In addition, of the allocation time of 333.3 μs for one scanning line, the precharge time width was 20 μs, and the last 10 μs was the reset time.

When an image was actually displayed, the brightness of white was 70 cd / m ² at a signal output of 0.1 mA. Various images were displayed and it was confirmed that good display characteristics without flicker were obtained.

Comparative Example 1 The display device was driven in the same manner as in Example 1 except that the scanning order of the upper and lower panels was the same. As a result, flicker occurred due to the difference in the timing of the scanning lines at the border of the panel.

Comparative Example 2 The display device was driven in the same manner as in Example 1 except that the upper and lower panels were scanned by a non-interlaced system with a frame frequency of 60 Hz. As a result, the ratio of the rise of signal input to the scanning period and the ratio of the reset period increased, and the luminance decreased to 60 cd / m ² .

[0048]

According to the driving method of the display device of the present invention, when displaying by interlaced scanning, flicker occurring at the boundary of a plurality of divided display areas can be reduced, so that the frame frequency can be increased without increasing. It became possible to obtain a high-definition image display.

[Brief description of drawings]

FIG. 1 is an example of a display device showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a structural example of an organic electroluminescence device.

FIG. 3 is an equivalent circuit showing an example of a simple matrix display device.

FIG. 4 is a diagram showing interlaced scanning.

FIG. 5 is an example in which interlaced scanning is applied.

FIG. 6 is a diagram showing a scanning method of the display device according to the present invention.

FIG. 7 is a diagram showing a scanning method of the display device according to the present invention.

FIG. 8 is a diagram showing a scanning method of the display device according to the present invention.

FIG. 9 is a diagram showing a structural example of an organic electroluminescence device.

[Explanation of symbols]

11, 12: Light emitting display section 13, 14: signal line drive circuit 15, 16: Scan line drive circuit 21, 41: glass substrate 22, 42: Anode (stripe-shaped first electrode) 23, 44: Hole transport layer 24, 45: Organic light emitting layer 25, 46: Cathode (stripe-shaped second electrode) 26, 35: drive source 31: signal line 32: scan line 33: Signal line switch 34: Scan line switch 36: Reverse bias voltage source 37: Organic electroluminescent device 43: Insulation layer

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Claims (3)

[Claims] 1. A display device having a plurality of scanning regions in which display elements are arranged at respective intersections of signal lines and scanning lines, and when the respective regions are line-sequentially driven for display, they are arranged in parallel at the boundaries of the respective regions. The difference in scanning timing between adjacent scanning lines,
A method for driving a display device, wherein the display device is set to 1 millisecond or longer. 2. The display device drive according to claim 1, wherein the plurality of areas perform interlaced scanning in which even-numbered scanning lines and odd-numbered scanning lines are alternately selected for each field. Method. 3. The method for driving a display device according to claim 1, wherein the display element is an organic electroluminescent element.