JP2005003768A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that flicker occurs when a display device using a conventional organic EL light emitting element generates vibration due to external factors during walking, or during moving in a vehicle, a ship, an aircraft or the like. <P>SOLUTION: The display device performs image display superior in gradation expression and always displays images generating no flicker by performing a plurality of times of light emission in each line in one frame period by a plurality of sub-frames in one frame period when extracting a vibration frequency of the vibration due to the external factor and a vibration level, detailedly grasping a state easy to generate the flicker to be discriminated, and performing vibration easy to generate the flicker by using the result and by continuously emitting light in each line in one frame period when preventing the occurrence of the flicker during vibration and generating no flicker without vibration. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a display device in which flicker does not occur when a vibration due to an external factor occurs in a display device while walking or moving on a vehicle, a ship, an aircraft, or the like (hereinafter abbreviated as vibration).
[0002]
[Prior art]
Conventionally, organic EL panels have been actively researched as portable display devices. Organic EL panels have begun to be adopted in display panels for portable devices, car stereos, etc., taking advantage of their wide viewing angle and high contrast.
The structure of an organic EL panel as a display device is composed of a plurality of light emitting elements, and the light emitting elements are composed of anode, electron transport layer, light emitting layer, hole transport layer, cathode, and the like, and a direct current voltage between the anode and the cathode. Light is emitted when a current is applied with the current applied.
[0003]
As an example of displaying images and characters using a plurality of light-emitting elements on an organic EL panel, a large number of anode lines and a large number of cathode lines are arranged in a grid pattern, and the light emission at the intersection of the grid pattern lines There is a simple matrix method in which a current is passed between the electrodes of the element to emit light.
As a method for expressing gradation of an organic EL panel by this simple matrix method, there are two methods, a pulse width modulation method for controlling the length of light emission time and a time division drive method.
[0004]
FIG. 10 shows a schematic diagram of a conventional display device using a pulse width modulation system. This conventional display device includes an A / D converter 1, a memory 2, a pulse width modulation drive circuit 3, an anode drive circuit 7, a cathode drive circuit 8, and a light emitting panel 9.
[0005]
An operation example of this conventional display device will be described. First, the video signal Sin is added to the A / D converter 1 as an input signal, converted into digital data D1, and stored in the memory 2 for one frame. From the memory 2, the stored digital data D1 of the video signal is converted into data D2w of all gradations for each pixel and sequentially transferred to the pulse width modulation driving circuit 3. The timing signal Pw is transferred from the pulse width modulation driving circuit 3 to which the data D2w is input to the anode drive circuit 7 and the cathode drive circuit 8, respectively. Then, drive signals are sent from the anode drive circuit 7 and the cathode drive circuit 8 to the anode and the cathode of the light emitting panel 9 so that the light emitting panel 9 emits light in an image corresponding to the video signal.
[0006]
The pulse width modulation method shown in FIG. 10 is a method in which all gradations are successively displayed line by line, and gradation data sent in accordance with the video signal is continuously received during the scanning period of one line. This is a method of emitting light.
[0007]
Another time-division driving method is a method of controlling display brightness by finely dividing one image (frame) in terms of time. For example, one frame of a video signal is divided into four subframes (described in Patent Document 1 below).
[0008]
[Patent Document 1]
JP 2002-341824 A
[0009]
[Problems to be solved by the invention]
Such a simple matrix organic EL panel display device may be used during vibrations due to external factors. However, the light emitting element of the organic EL panel has a high response speed and little afterglow. When it was vibrated by an external factor, flickering was a problem.
[0010]
The pulse width modulation method can express gradation in detail because one gradation is continuously expressed for each line, but each line emits only one line in one frame period. Flicker was likely to occur even in the case of vibration.
[0011]
In the time-division driving method, since each line emits light a plurality of times in one frame period by providing a sub-frame, the light emission interval of each line is short and flicker does not easily occur. Tonal expression was difficult.
[0012]
Therefore, in the display device of the organic EL panel by the simple matrix method, if the pulse width modulation method is used at the time of vibration to perform detailed gradation expression, flicker is generated, and the previous time division method is used so that flicker is not generated at the time of vibration. When it was used, it was a problem that detailed gradation expression was not performed when it was not during vibration.
[0013]
The present invention has been made in view of the above points, and by extracting the vibration frequency and vibration level of the vibration due to external factors, the vibration state of the display device can be determined in detail, and the flicker and flicker easily occur. Set the conditions when vibration does not occur easily and select a display method that does not generate flicker when vibration is likely to occur. An object of the present invention is to display an image of a video signal in which flicker does not always occur by selecting a method.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the display device of the first means receives the video signal and displays the image based on the input video signal when the image signal is not detected when vibration due to an external factor is not detected. Is a display device that displays one frame without division and displays the video signal for one frame divided into a plurality of subframes when vibration due to an external factor is detected, and stores the video signal Storage means (memory 2), and first driving means (pulse width modulation) for generating a first timing signal for displaying an image of all gradations for each line of one frame in one frame period of the video signal Drive circuit 3) and a second timing signal for displaying an image by dividing all gradations for one frame for each line of each of the plurality of sub-frames during one frame period of the video signal. Second driving means (time-division driving circuit 4), vibration detection means (vibration detection circuit 5) for detecting the vibration and outputting a vibration signal, and the first or second timing according to the vibration signal. Selection means (selector 6) for selecting a signal and outputting the selected first or second timing signal, and a display for displaying an image corresponding to the selected first or second timing signal Means (light-emitting panel 9), and when the vibration signal is not detected, the video signal stored in the storage means is read out and input to the selected first driving means, and 1 of the video signal An image of all gradations is displayed for each line in a frame period, and when the vibration signal is detected, an image of all gradations is displayed by being divided into a plurality of subframes in one frame period of the video signal.
[0015]
In order to achieve the above object, the display device of the second means is the display device according to claim 1, wherein the one-line display interval when the second driving means is selected by the vibration detection means is the display device. The timing of the first or second timing signal is adjusted to be shorter than the one-line display interval when the first driving means is selected.
[0016]
In order to achieve the above object, the display device of the third means is the display device according to claim 1, wherein the storage means sets the read timing to 1/60 second or less for one frame period, When the driving means is selected, the maximum period for each subframe of the subframe is adjusted to be 1/120 second or less.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings with the most preferable examples. FIG. 1 is a schematic block diagram showing an embodiment of a display device according to the present invention. A vibration detection circuit grasps in detail a vibration state caused by an external factor and determines whether or not to generate flicker. As a result, when it is determined that it is not during vibration, the pulse width modulation driving circuit is selected to display a detailed gradation expression, and when it is determined that it is during vibration, the time-division driving circuit is selected to eliminate flicker. Display.
[0018]
1 includes an A / D converter 1, a memory 2 for storing a video signal for one frame, a pulse width modulation drive circuit 3, a time division drive circuit 4, a vibration detection circuit 5 for detecting vibration, and a comparison signal. The selector 6 for selecting timing signals from the pulse width modulation driving circuit 3 and the time-division driving circuit 4 by the above, the anode driving circuit 7 for inputting the timing signal and outputting the drive signal for the anode of the light emitting panel 9, and the light emitting panel 9 A cathode drive circuit 8 that outputs a cathode drive signal and a light emitting panel 9 that emits light upon receiving the anode and cathode drive signals.
[0019]
An operation example of the display device will be described below. First, the video signal Sin is added to the A / D converter 1 as an input signal, converted into digital data D1, and stored in the memory 2 for one frame. In the memory 2, the data D2w when there is no vibration or the D2t when vibration is selected and output by the selection signal Sd (when there is no vibration, the data of all the gradations are oscillated pixel by pixel for the pulse width modulation driving circuit 3). (Sometimes, gradation data in units of 1 bit is sequentially transferred to one pixel for the time division drive circuit 4).
[0020]
When the time when there is no vibration is selected, the pulse width modulation driving circuit 3 receives the data D2w from the memory 2, outputs the timing signal Pw, and applies it to the selector 6.
On the other hand, when the vibration time is selected, the time division drive circuit 4 receives the data D2t from the memory 2, outputs the timing signal Pt, and applies it to the selector 6.
The selector 6 selects the timing signal Pw when there is no vibration and the timing signal Pt when it vibrates and applies it to the anode driver circuit 7 and the cathode driver circuit 8 as the selection timing signal Ps.
[0021]
Then, from the anode driver circuit 7 that has received the selection timing signal Ps from the selector 6, the switches CSW1, CSW2, CSW3,. . . Drive signal A1, A2, A3,... Of the anode line in which the switch is turned on. . Is supplied to the light emitting panel 9.
Similarly, from the cathode drive circuit 8 that has received the selection timing signal Ps from the selector 6, the cathode lines R1, R2, R3,. . Switches RSW1, RSW2, RSW3,... For selecting drive voltage VDD or GND. . Are supplied, and the cathode line signals R1, R2, R3,. . Is added to the light-emitting panel 9, and an image corresponding to the video signal Sin is emitted by the light-emitting panel 9.
[0022]
The vibration detection circuit 5 detects the vibration of the display device 9 due to an external factor, generates vibration data Sd of 0 when there is no vibration, and 1 to the memory 2 and the selector 6 when there is vibration.
[0023]
Next, the operation of the light emitting panel 9 will be described with reference to FIG. In FIG. 2, the light emitting elements EL (1,1), EL (1,2),. . . An example of the selection state is shown. In FIG. 2, since the switch CSW1 of the anode drive circuit 9 is ON, the drive current A1 is selected and supplied to the line C1. On the other hand, in the cathode drive circuit 10, the switch RSW1 selects GND and a current flows, and the other switches RSW2, RSW3,. . Since VDD is selected, no current flows, so that a current flows from the C1 line through the light emitting element EL (1, 1) to the GND via the R1 line. Therefore, the drive current A1 flows through the light emitting element EL (1, 1) of the light emitting panel 9 to emit light. Similarly, if CSW2 is turned ON, EL (1, 2), and if CSW3 is turned ON, EL (1, 3),. . . . . Emits light.
[0024]
Next, an example of light emission when the pulse width modulation driving circuit 3 is selected will be described with reference to FIGS. As an example of the light-emitting panel, anode drive 200 lines × cathode drive 50 lines.
In FIG. 3, the first gradation data for one line is transferred to the anode drive switches CSW1, CSW2, CSW3,. . . . , Sent to a shift register (not shown) of CSW200. Next, the first gradation data for one line is transferred from the shift register to a latch circuit (not shown) and stored, and anode drive switches CSW1, CSW2, CSW3,. . . . , The stored first gradation data for one line is sent to the CSW 200.
[0025]
The data of the first gradation for one line is transferred to the anode drive switches CSW1, CSW2, CSW3,. . . . , CSW200, RSW1 is set to the GND side from the cathode drive circuit 8. Then, the anode drive circuit 7 to the anode drive switches CSW1, CSW2, CSW3,. . . . , CSW200 and light emitting elements EL (1,1), EL (1,2), EL (1,3),. . . . . , EL (1,200) through the line R1, the current flows to the GND, and the light emitting elements EL (1,1), EL (1,2), EL according to the first gradation data for one line. (1,3),. . . . . , EL (1,200) emits light for one gradation light emission period P1.
[0026]
Anode drive switches CSW1, CSW2, CSW3,. . . . As soon as latching of the first gradation data for one line to CSW 200 is completed, the second gradation data for one line is sent to a shift register (not shown), and the second gradation data for line R1 is one line worth of data. Immediately after the one gradation light emission period P1 is sent to the shift register over one gradation data transfer time td, if the second gradation data of the line R1 is transferred to a latch circuit (not shown), two gradations for one line are obtained. Depending on the eye data, the light emitting elements EL (1,1), EL (1,2), EL (1,3),. . . . . , EL (1,200) emits light as the second gradation of the line R1 following the light emission of the first gradation of the line R1. This is performed for 15 gradations, and the emission of the line R1 is completed.
[0027]
As described above, the light emitting element continuously emits light according to each gradation data at the interval of one gradation light emission period P1 for one line. In other words, if the one gradation data transfer time td for one line is equal to or less than the one gradation light emission period P1, light can be emitted continuously for each gradation. Further, at the boundary between the first line and the second line, if the first gradation data of the second line is transferred during the last gradation light emission of the first line, the light emission can be continued without any gap.
[0028]
As a specific example of the light emission period, for example, assuming that CSW1 in FIG. 3 is three gradation data, EL (1, 1) is emitted continuously for the light emission period (3 × P1) for three gradations. Similarly, CSW2 is EL (1, 2) for two gradations, CSW3 is EL (1, 3),. . . , CSW200 emits EL (1,200) continuously for four gradations. Each gradation emits light at the same interval and at the same timing. When the light emission period of the 15th gradation of the line R1 is completed, the first gradation data for one line of the line R2 is sent during the light emission period of the 15th gradation of the line R1, so that the light emission of the line R2 is continued. Can start.
[0029]
In this way, R1, R2, R3,. . . R50 lines emit light in sequence for one line (the first gradation is one gradation data transfer time td + 1 gradation emission period P1 × 15, and the second and subsequent gradations are one gradation emission period P1 × 15) for one frame period. The luminescence is formed.
Accordingly, each line emits light once per frame during one frame period, and gradation expression is performed by continuous light emission of the light emitting element, so that a smooth continuous gradation expression can be obtained.
[0030]
Next, an example of light emission when the time division drive circuit 4 is selected will be described with reference to FIGS.
In FIG. 5A, in the line R1, first, the first gradation data for one line is transferred to the anode drive switches CSW1, CSW2, CSW3,. . . . , Sent to a shift register (not shown) of CSW200. Next, the first gradation data for one line is transferred from the shift register to a latch circuit (not shown) and stored, and anode drive switches CSW1, CSW2, CSW3,. . . . , Sent to CSW200.
[0031]
When the first gradation data of the line R1 is transferred to the latch circuit (not shown) and the cathode drive circuit 8 sets the R1 switch RSW1 to the GND side, the anode drive switch 7 switches to the anode drive switch CSW1, CSW2, CSW3,. . . . , CSW200 and each light emitting element EL (1,1), EL (1,2), EL (1,3),. . , EL (1,200) and a current through GND via the line R1, and the light emitting elements EL (1,1), EL (1,2), EL, according to the first gradation data for one line of the line R1. EL (1,3),. . , EL (1,200) emits light for one gradation light emission period P1. Next, the first gradation data for one line of the line R2 is transferred while the line R1 is emitting light. Then, light is emitted according to the first gradation data for one line of the line R2. In the same manner, 50 lines are emitted for the first gradation of each line. This is subframe 1.
[0032]
Next, as shown in FIG. 5B, after transferring the second gradation data of the line R1 to the latch circuit (not shown) while the R50 line of the first gradation is emitted, the cathode drive circuit 8 When the switch RSW1 for the line R1 is set to the GND side by the above-mentioned, the anode drive switches CSW1, CSW2, CSW3,. . . . , CSW200, the light emitting elements EL (1,1), EL (1,2), EL (1,3),. . , EL (1,200) flows and emits light for the light emission period P2 of the second gradation for one line. Next, each light emitting element EL (1, 1), EL (1, 2), EL (1, 3),. . , EL (1,200) is emitted. The second gradation of each line is emitted in the following order. This is subframe 2. Next, the third gradation is emitted, and this is subframe 3, and the fourth gradation is emitted as subframe 4.
[0033]
In this way, as shown in FIG. 6, one frame period is composed of a plurality of subframes, and each line is caused to emit light a plurality of times in one frame period.
The total light emission period of each subframe is, for example, P1 × 50 for subframe 1, P2 × 50 for subframe 2, P3 × 50 for subframe 3, P4 × 50 for subframe 4, and P1 for one gradation. Then, P2 is set to 2 gradations, P3 is set to 4 gradations, and P4 is set to 8 gradations. For example, when the light emitting element EL (1, 1) is to emit light for three gradations, the anode drive switch CSW1 is set to be turned on in the subframe 1 and the subframe 2. Further, in the case of the light emitting element EL (1, 2), when it is attempted to emit light for two gradations, the anode drive switch CSW1 is turned ON only in the subframe 2. Hereinafter, a subframe is selected according to the gradation to be emitted.
[0034]
Thus, if one frame period is composed of a plurality of sub-frames, the video signal can be divided to display an image of all gradations. At this time, since each line emits light a plurality of times in one frame period, gradation representation of the video signal is not performed continuously and it is difficult to represent smooth continuous gradation, but the light emission interval of each line is shortened. Therefore, it is possible to prevent the occurrence of flicker due to the influence of vibration during fluctuation.
[0035]
Next, a specific setting example of the light emission period will be shown. When no vibration is generated, it is necessary that no flicker occurs due to light emission of the display device itself. Therefore, the light emission period is set to 1/60 seconds according to the television vertical synchronization signal frequency 60 Hz where flicker is not noticeable.
[0036]
In the setting of the light emission period, FIG. 7A shows a case where the pulse width modulation driving circuit 3 is selected when there is no vibration and one frame is set to 1/60 seconds, and R1, R2, R3, R4,. . , R49, R50, all the gradations are expressed one line at a time. The light emission period of each line is 1/3000 seconds (= 1/60 seconds ÷ 50 lines).
Accordingly, each line emits light once every 1/60 seconds for a period of 1/3000 seconds. Although td is included in the first line but is a short period, the light emission period of the first gradation may be shortened.
[0037]
If there is no vibration, light emission is performed once every 1/60 seconds, and flicker due to light emission of the display device when the pulse width modulation driving circuit 3 is selected does not occur. For example, the display device during vibration has a vibration frequency F ( When it vibrates at Hz), F (Hz) modulation is applied during the light emission period, and the video signal frame frequency modulated at this time is based on 60 Hz. Therefore, the video frame frequency at the time of vibration is Fx (= 60 Hz-F (Hz). )).
[0038]
9 shows a vibration level correction curve for the vibration frequency F (Hz) and the vibration video signal frame frequency Fx on the basis of the frequency of 60 Hz (Visibility listed in Ono Sokki report 1999. Oct. No. 9). Calculated from the correction curve). This vibration level correction curve shows a value that generates flicker with respect to the standard vibration level (0 db), and flicker is generated when the vibration level becomes equal to or greater than the vibration level correction curve.
[0039]
Therefore, according to FIG. 9, when the pulse width modulation driving circuit 3 is used, flicker is generated when the vibration level is 12 db or more and the vibration frequency F is 10 Hz, for example.
[0040]
Next, FIG. 7B shows a case where the time-division drive circuit 4 is selected at the time of vibration. One frame period is set to 1/60 second, and the sub-frame 1 has a total light emission time of 1 gradation for 1/960. Seconds. The light emission period is set to a total of 1/480 seconds for 2 gradations in subframe 2, a total of 1/240 seconds for 4 gradations in subframe 3, and a total of 1/120 seconds for 8 gradations in subframe 4. . The shaded area on the left of the figure is a 1/960 second blank, and is used for data transfer of the first gradation, but of course it may be used for more detailed gradation expression.
[0041]
Therefore, each line emits 4 times in 1/60 seconds. Taking the light emission interval at the maximum gradation that most affects flicker as an example, it is 1/120 second of subframe 4. Since this is 120 Hz when converted to the vertical synchronizing signal frequency of the video signal, in this case, for example, even when the display device is vibrated at the vibration frequency F (0 to 60 Hz), the video frame frequency Fx during vibration is 60 Hz or more (when vibration occurs). Since video frame frequency Fx = vertical synchronization signal frequency−vibration frequency F), flicker does not occur. Since the other subframes have a shorter light emission interval, flicker does not occur in the same manner.
[0042]
Next, the vibration detection circuit 5 will be described with reference to FIG.
As shown in FIG. 8, the vibration detection circuit 5 is composed of a vibration sensor 5a (a vibrator, a spring, and a piezoelectric element. When the vibrator vibrates, the vibration pressure is transmitted to the piezoelectric element through the spring, and the piezoelectric element responds to the pressure. A potential change Pin is generated at the electrodes A and B), a preamplifier circuit 5b, a filter circuit 5c, an amplifier circuit 5d, and a vibration determination circuit 5e.
[0043]
An operation example of the vibration detection circuit 5 will be described. First, when a vibration is applied to the vibration sensor due to an external factor, a potential change Pin is generated and sent to the preamplifier circuit 5b. The preamplifier circuit 5b converts the potential change Pin into an electric signal Sa and sends it to the filter circuit 5c. The filter circuit 5c performs noise removal and frequency separation of the electric signal Sa. From the vibration frequency F in FIG. 9, for example, filter a (frequency band 0 to less than 10 Hz), filter b (frequency band 10 Hz to less than 20 Hz, filter c ( The electric signals Sb1 (0 to less than 10 Hz), Sb2 (10 to less than 20 Hz), and Sb3 (20 Hz or more) divided into the three frequency bands of 20 Hz or more are divided and output.
[0044]
The electric signals Sb1, Sb2, and Sb3 outputted after the division are input to the amplifier circuit 5d, and level correction corresponding to the vibration correction curve of FIG. 9 is performed, and the amplifier circuit a performs the vibration determination signal Sc1 (= Sb1 / 4. (−12db)), the vibration determination signal Sc2 (= Sb2 / 2... (−6db)) in the amplifier circuit b, and the vibration determination signal Sc3 (= Sb3 / 1... (0db)) in the amplifier circuit c. The vibration determination signals Sc1, Sc2, Sc3 are added to the vibration determination circuit 5e. If all the vibration determination signals Sc1, Sc2, Sc3 are less than the standard vibration signal level (0 db), the vibration data Sd 0, and if any of the vibration determination signals Sc1, Sc2, Sc3 is equal to or higher than the standard vibration signal level (0db), it is determined that there is vibration and vibration data Sd is output from the vibration determination circuit 5e.
[0045]
The standard vibration signal level (0db) of the vibration determination circuit 5e depends on the actual situation depending on the number of pixels, luminance, contrast, type of image (natural image, text, illustration image, etc.), display size, indoor lighting, etc. Determine.
[0046]
【The invention's effect】
As described above, according to the display device of the present invention, by extracting the vibration frequency and vibration level of vibration due to external factors, the vibration state that is likely to cause flicker is determined in detail, and the display device is determined based on the determination result. When there is no vibration due to external factors, the video signal is displayed without being divided, and when the vibration due to external factors occurs, the video signal for one frame is divided into a plurality of subframes and displayed. Thus, it is possible to always display an image of an optimal video signal that does not cause flicker.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a basic configuration of an entire display device according to the present invention.
FIG. 2 is a diagram showing a detailed view of a light emitting panel of a display device according to the present invention.
FIG. 3 is a diagram showing a gradation period for each line of the pulse width modulation method used in the present invention.
FIG. 4 is a diagram showing an operation in one frame period of a pulse width modulation method used in the present invention.
FIG. 5 is a diagram showing a gradation period for each line of the time-division driving method used in the present invention.
FIG. 6 is a diagram showing an operation in one frame period of a time division driving method used in the present invention.
FIG. 7 is a diagram showing a comparison diagram of light emission states in two driving methods used in the present invention.
FIG. 8 is a schematic explanatory diagram of a vibration detection circuit according to the present invention.
FIG. 9 is a diagram illustrating a vibration level correction curve with respect to a vibration frequency.
FIG. 10 is a diagram showing an outline of a conventional display device.
[Explanation of symbols]
1 A / D converter 2 Memory (memory means)
3 Pulse width modulation drive circuit (first drive means)
4 Time-division drive circuit (second drive means)
5 Vibration detection circuit (Vibration detection means)
5a Vibration sensor 5b Preamplifier circuit 5c Filter circuit 5d Amplifier circuit 5e Vibration determination circuit 6 Selector (selection means)
7 Anode drive circuit 8 Cathode drive circuit 9 Light emitting panel (Display means)

Claims (3)

When a video signal is input and a display device that displays an image based on the input video signal does not detect vibration due to external factors, the video signal is displayed for one frame without being divided, and vibration due to external factors is detected. A display device that divides and displays the video signal for one frame into a plurality of sub-frames,
Storage means for storing the video signal;
First driving means for generating a first timing signal for displaying an image of all gradations for each line of one frame in one frame period of the video signal;
Second driving means for generating a second timing signal for displaying an image by dividing all gradations of one frame for each line of each of the plurality of sub-frames in each frame period of the video signal;
Vibration detecting means for detecting the vibration and outputting a vibration signal;
Selecting means for selecting the first or second timing signal by the vibration signal and outputting the selected first or second timing signal;
Display means for displaying an image according to the selected first or second timing signal;
When the vibration signal is not detected, the video signal stored in the storage means is read out and input to the selected first driving means, and all the gradations are obtained for each line in one frame period of the video signal. An image display apparatus, wherein when the vibration signal is detected, an image of all gradations is displayed by being divided into a plurality of subframes in one frame period of the video signal. The display device according to claim 1,
The vibration detection means causes the first or second line so that the one-line display interval when the second driving means is selected is shorter than the one-line display interval when the first driving means is selected. A display device that adjusts timing of a timing signal. The display device according to claim 1,
The storage means sets the readout timing to 1/60 seconds or less for one frame period, and when the second driving means is selected, the subframe is set to have a maximum period of 1/120 seconds or less for each subframe. A display device characterized in that the adjustment is performed.

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