Display device and driving method of the display device

A display device electrically controlling a position of a mechanical shutter of each pixel to display an image, comprising;

• a plurality of pixels each including the mechanical shutter;
• a first signal line inputting a first image signal to each of the pixels;
• a second signal line inputting a second image signal to each of the pixels;
• and
• a scanning line inputting a scanning voltage to each of the pixels;
• wherein
• each of the pixels includes a pixel circuit electrically controlling a position of the mechanical shutter;
• the pixel circuit includes a first control electrode and a second control electrode, a first control voltage application circuit and a second control voltage application circuit, the mechanical shutter being put between the first and second control electrodes, the first control voltage application circuit inputting a first control voltage to the first control electrode according to the first image signal, the second control voltage application circuit inputting a second control voltage to the second control electrode according to the second image signal;
• the first control voltage application circuit includes a first input transistor, a first retaining capacitor and a first transistor, the first input having a first current terminal connected to the first signal line, a gate connected to the scanning line and a second current terminal, said first retaining capacitor having a first terminal to be input with a capacitor control signal and a second terminal connected to the second current terminal of the first input transistor, the first retaining capacitor retaining a voltage input by the first input transistor, the first transistor having a gate connected to the second terminal of the first retaining capacitor, a first current terminal connected to the first control electrode and a second current terminal to be input with a control signal;
• the second control voltage application circuit includes a second input transistor, a second retaining capacitor and a second transistor, the second input transistor having a first current terminal connected to the second signal line, a gate connected to the scanning line and a second current terminal, the second retaining capacitor having a first terminal to be input with a capacitor control signal and a second terminal connected to the second current terminal of the second input transistor, the second retaining capacitor retaining a voltage input by the second input transistor, the second transistor having a gate connected to the second terminal of the second retaining capacitor, a first current terminal connected to the second control electrode and a second current terminal to be input with the control signal;
• and
• a voltage level of the capacitor control signal, the control signal are changed at certain timing to control a position of the mechanical shutter.

A driving method of a display device electrically controlling a position of a mechanical shutter to display an image comprising;

• a plurality of pixels each including the mechanical shutter;
• a signal line inputting an image signal to each of the pixels;
• and
• a scanning line inputting a scanning voltage to each of the pixels;
• wherein
• each of the pixels includes a pixel circuit electrically controlling a position of the mechanical shutter;
• the pixel circuit includes a first control electrode, a second control electrode and a first control voltage application circuit, the mechanical shutter being put between the first and second control electrodes, the first control voltage application circuit inputting a first control voltage to the first control electrode according to the image signal;
• the first control voltage application circuit includes an input transistor, a retaining capacitor and a first transistor, the input transistor having a first current terminal connected to the signal line, a gate connected to the scanning line and a second current terminal, the retaining capacitor having a first terminal to be input with a capacitor control signal and a second terminal connected to the second current terminal of the input transistor, the retaining capacitor retaining a voltage input by the input transistor, the first transistor having agate connected to the second terminal of the retaining capacitor, a first current terminal connected to the first control electrode and a second current terminal input with a first control signal;
• and
• a second control signal is input to the second control electrode;
• said method comprising;
• on the assumption that time elapses in a sequence from a time t1 to a time t6 in one sub-frame time period, a voltage of a second voltage level is applied to the mechanical shutter within whole of the one sub-frame time period,
• changing a voltage of the second control signal from a first voltage level to the second voltage level at time t1 after a voltage corresponding to the image signal is retained in the retaining capacitor of all the pixels, and from the second voltage level to the first voltage level at time t6, whereby the voltage of the second control electrode is changed to the second voltage level at time t1 and to the first voltage level at time t6;
• changing a voltage of the capacitor control signal from the first voltage level to the second voltage level at time t2 and from the second voltage level to the first voltage level at time t4;
• and
• changing the first control voltage from an intermediate voltage level to the second voltage level at time t3, from the second voltage level to the first voltage level at time t4 and from the first voltage level to the intermediate voltage level at time t5,
• whereby changing the voltage of the first control electrode to the second voltage level by the first transistor functioning as a diode at time t3, and changing the voltage of the first electrode to the first voltage level in a case where the first transistor is turned ON in accordance with the voltage retained in the retaining capacitor at time t4, or maintaining the voltage of the first electrode at the second voltage level in a case where the first transistor is turned OFF in accordance with the voltage retained in the retaining capacitor at time t4.

A driving method of a display device electrically controlling a position of a mechanical shutter to display an image comprising;

• a plurality of pixels each including the mechanical shutter;
• a first signal line inputting a first image signal to each of the pixels;
• a second first signal line inputting a second image signal to each of the pixels;
• and
• a scanning line inputting a scanning voltage to each of the pixels;
• wherein
• each of the pixels includes a pixel circuit electrically controlling a position of the mechanical shutter;
• the pixel circuit includes a first control electrode and a second control electrode, a first control voltage application circuit and a second control voltage application circuit, the mechanical shutter beingput between the first and second control electrodes, the first control voltage application circuit inputting a first control voltage to the first control electrode according to the first image signal, the second control voltage application circuit for inputting a second control voltage to the second control electrode according to the second image signal;
• the first control voltage application circuit includes a first input transistor, a first retaining capacitor and a first transistor, the first input transistor having a first current terminal connected to the first signal line, a gate connected to the scanning line and a second current terminal, the first retaining capacitor having a first terminal to be input with a capacitor control signal and a second terminal connected to the second current terminal of the first input transistor, the first retaining capacitor retaining a voltage input by the first input transistor, the first transistor having a gate connected to the second terminal of the first retaining capacitor, a first current terminal connected to the first control electrode and a second current terminal input with a control signal;
• and
• the second control voltage application circuit includes a second input transistor, a second retaining capacitor and a second transistor, the second input transistor having a first current terminal connected to the second signal line, a gate connected to the scanning line and a second current terminal, the second retaining capacitor having a first terminal to be input with a capacitor control signal and a second terminal connected to the second current terminal of the second input transistor, the second retaining capacitor retaining a voltage input to the second input transistor, the second transistor having a gate connected to the second terminal of the second retaining capacitor, a first current terminal connected to the other terminal of the second control electrode and a second current terminal to be input with the control signal;
• the method comprising;
• on the assumption that time elapses in a sequence from a time t1 to a time t6 in one sub-frame time period, a voltage of a second voltage level is applied to the mechanical shutter within whole of the one sub-frame time period,
• changing a voltage of capacitor control signal from a first voltage level to the second voltage level at time t1 after a voltage corresponding to the image signal is retained in the retaining capacitor of all the pixels, and from the second voltage level to the first voltage in time t3;
• and
• changing voltage of the control signal from an intermediate voltage level to the second voltage level at time t2, from the second voltage level to the first voltage level at time t3 and from the first voltage level to the intermediate voltage level at time t4,
• whereby changing the voltage of the first control electrode to the second voltage level by the first transistor functioning as a diode at time t2, and changing the voltage of the first control electrode to the first voltage level in a case where the first transistor is turned ON in accordance with the voltage retained in the first retaining capacitor at time t3, or maintaining the voltage of the first control electrode at the second voltage level in a case where the first transistor is turned OFF in accordance with the voltage retained in the first retaining capacitor at time t3, changing the voltage of the second control electrode to the second voltage level by the second transistor functioning as a diode at time t2, and changing the voltage of the second control electrode to the first voltage level in the case where the second transistor is turned ON in accordance with the voltage retained in the second retaining capacitor at time t3, or maintaining the voltage of the second control electrode at the second voltage level in a case where the second transistor is turned OFF in accordance with the voltage retained in the second retaining capacitor at time t3.