Light emitting device with plurality of column circuits each including selection circuit for outputting color data, image forming device, display device, image capturing device, electronic apparatus, illumination device, moving body, and wearable device
A light emitting device comprises a plurality of pixels arranged in a plurality of rows and a plurality of columns, a plurality of column circuits to drive the columns, a voltage generation circuit to output a set of voltage signals, and a control circuit. The plurality of pixels includes a first sub-pixel for a first color, a second sub-pixel for a second color, and a third sub-pixel for a third color. Each of the plurality of column circuits includes a first selection circuit to output one of first color data, second color data, and third color data, a digital-analog converter to convert the color data into an analog signal based on the set of voltage signals, and a second selection circuit to supply the analog signal to one of the sub-pixels.
1 . A light emitting device comprising:
a plurality of pixels arranged to form a plurality of rows and a plurality of columns;
a plurality of column circuits configured to drive the plurality of columns, respectively;
a voltage generation circuit configured to output a set of voltage signals; and
a control circuit,
wherein each of the plurality of pixels comprises (1) a first sub-pixel configured to emit light in a first color, (2) a second sub-pixel configured to emit light in a second color different from the first color, and (3) a third sub-pixel configured to emit light in a third color different from the first color and the second color,
wherein each of the plurality of column circuits comprises (1) a first selection circuit configured to output one of first color data, second color data, and third color data which are input to the column circuit and which correspond to the first color, the second color, and the third color, respectively, (2) a digital-analog converter configured to convert, based on the set of voltage signals output by the voltage generation circuit, the output one of the first color data, the second color data, and the third color data into an analog signal, and (3) a second selection circuit configured to supply the analog signal output from the digital-analog converter to one of the first sub-pixel, the second sub-pixel, and the third sub-pixel that emits light in a corresponding color,
wherein the plurality of column circuits comprises a first column circuit, a second column circuit, and a third column circuit,
wherein the control circuit controls such that, in a first period, (1) in the first column circuit, the first selection circuit outputs the first color data to the digital-analog converter, (2) in the second column circuit, the first selection circuit outputs the second color data to the digital-analog converter, and (3) in the third column circuit, the first selection circuit outputs the third color data to the digital-analog converter,
wherein the first column circuit comprises a first latch circuit and a second latch circuit each configured to hold one of the first color data and the second color data,
wherein the second column circuit comprises a third latch circuit and a fourth latch circuit each configured to hold one of the first color data and the second color data, and
wherein the control circuit controls input to each latch circuit such that (1) the first color data is input to the first latch circuit and the fourth latch circuit and (2) the second color data is input to the second latch circuit and the third latch circuit, and
wherein the control circuit controls the first selection circuit of each of the first column circuit and the second column circuit such that the first selection circuit outputs, in the first period, one of the first color data and the second color data held by the first latch circuit and the third latch circuit, and outputs, in a second period following the first period, one of the first color data and the second color data held by the second latch circuit and the fourth latch circuit.
2 . The device according to claim 1 , wherein the control circuit controls such that, in the second period following the first period, the first selection circuit of each of the first column circuit and the second column circuit outputs, to the digital-analog converter, one of the first color data and the second color data which is different from one of the first color data and the second color data output by the first selection circuit in the first period.
3 . The device according to claim 1 , wherein the control circuit further controls to execute (1) a first mode for causing the first selection circuit of the first column circuit to output the first color data and causing the first selection circuit of the second column circuit to output the second color data, and (2) a second mode for causing the first selection circuit of each of the first column circuit and the second column circuit to output one of the first color data and the second color data.
4 . The device according to claim 1 , wherein the first selection circuits of the first column circuit and the second column circuit are controlled to operate synchronously.
5 . The device according to claim 1 , wherein the first selection circuit and the second selection circuit of each of the plurality of column circuits are controlled to operate synchronously.
6 . The device according to claim 1 , wherein the first column circuit and the second column circuit drive a first pixel and a second pixel arranged in a predetermined row of the plurality of rows based on the first color data and the second color data supplied to the respective digital-analog converters in the first period.
7 . The device according to claim 1 , wherein the first column circuit and the second column circuit are arranged alternately in a row direction.
8 . The device according to claim 1 , wherein the plurality of column circuits are divided into blocks each including a predetermined number of column circuits, and
wherein the control circuit controls such that all of the first selection circuits of the column circuits included in the block do not output the same one of the first color data and the second color data in the first period.
9 . The device according to claim 1 , wherein each of the plurality of column circuits further includes a driving circuit, and
wherein an output of the digital-analog converter is supplied to one of the first sub-pixel and the second sub-pixel via the driving circuit.
10 . An image forming device comprising:
a photosensitive member;
an exposure light source configured to expose the photosensitive member;
a developing device configured to apply a developing agent to the exposed photosensitive member; and
a transfer device configured to transfer an image developed by the developing device to a print medium,
wherein the exposure light source includes the light emitting device according to claim 1 .
11 . An image capturing device comprising:
an optical unit including a plurality of lenses;
an image capturing element configured to receive light having passed through the optical unit; and
a display unit configured to display an image captured by the image capturing element,
wherein the display unit includes the light emitting device according to claim 1 .
12 . A display device comprising:
a display unit including the light emitting device according to claim 1 ; and
a housing provided with the display unit.
13 . An electronic apparatus comprising:
a display unit including the light emitting device according to claim 1 ;
a housing provided with the display unit; and
a communication unit provided in the housing and configured to perform external communication.
14 . An illumination device comprising:
a light source including the light emitting device according to claim 1 ; and
one of a light diffusing unit and an optical film, the light diffusing film and the optical film being configured to transmit light emitted by the light source.
15 . A mobile body comprising:
a lighting appliance including the light emitting device according to claim 1 ; and
a body provided with the lighting appliance.
16 . A wearable device comprising:
a display device configured to display an image,
wherein the display device includes the light emitting device according to claim 1 .
17 . A light emitting device comprising:
a plurality of pixels arranged to form a plurality of rows and a plurality of columns;
a plurality of column circuits configured to drive the plurality of columns, respectively;
a voltage generation circuit configured to output a set of voltage signals; and
a control circuit,
wherein each of the plurality of pixels comprises (1) a first sub-pixel configured to emit light in a first color, (2) a second sub-pixel configured to emit light in a second color different from the first color, and (3) a third sub-pixel configured to emit light in a third color different from the first color and the second color,
wherein each of the plurality of column circuits comprises (1) a first selection circuit configured to output one of first color data, second color data, and third color data which are input to the column circuit and which correspond to the first color, the second color, and the third color, respectively, (2) a digital-analog converter configured to convert, based on the set of voltage signals output by the voltage generation circuit, the output one of the first color data, the second color data, and the third color data into an analog signal, and (3) a second selection circuit configured to supply the analog signal output from the digital-analog converter to one of the first sub-pixel, the second sub-pixel, and the third sub-pixel that emits light in a corresponding color,
wherein the plurality of column circuits comprises a first column circuit, a second column circuit, and a third column circuit,
wherein the control circuit controls such that, in a first period, (1) the first selection circuit outputs the first color data to the digital-analog converter in the first column circuit, (2) the first selection circuit outputs the second color data to the digital-analog converter in the second column circuit, and (3) the first selection circuit outputs the third color data to the digital-analog converter in the third column circuit, and
wherein the control circuit further controls to execute (1) a first mode for causing the first selection circuit of the first column circuit to output the first color data and for causing the first selection circuit of the second column circuit to output the second color data, and (2) a second mode for causing the first selection circuit of each of the first column circuit and the second column circuit to output one of the first color data and the second color data.
18 . The device according to claim 17 , wherein the control circuit controls such that, in a second period following the first period, the first selection circuit of each of the first column circuit and the second column circuit outputs, to the digital-analog converter, one of the first color data and the second color data which is different from one of the first color data and the second color data output by the first selection circuit in the first period.
19 . A wearable device including:
a display device configured to display an image,
wherein the display device includes the light emitting device according to claim 17 .