Display device

1 . A display device, comprising:

a display panel comprising a plurality of light-emitting elements, the plurality of light-emitting elements comprising first light-emitting elements configured to emit light in a first color, and second light-emitting elements configured to emit light in a second color different from the first color;

at least one solar cell configured to receive light from the plurality of light-emitting elements;

a measuring unit configured to measure an output from the at least one solar cell; and

a control unit configured to individually control emission of light from the plurality of light-emitting elements using one or more control signals,

wherein:

the measuring unit is further configured to measure a reference electromotive force that is an electromotive force generated by the solar cell and observed when the control unit causes the plurality of light-emitting elements to stop emitting light, and to measure a first electromotive force and a second electromotive force, both of which are electromotive forces of the solar cell, the first electromotive force being observed when the control unit causes all the first light-emitting elements alone to emit light, and the second electromotive force being observed when the control unit causes all the second light-emitting elements alone to emit light, and

the control unit corrects a control signal corresponding to at least one of the plurality of light-emitting elements in accordance with one or more measurements performed by the measuring unit, such that a ratio of a first corrected electromotive force to a second corrected electromotive force at present time is close to a ratio of the first corrected electromotive force to the second corrected electromotive force at a time of shipment, the first corrected electromotive force being obtained by subtracting the reference electromotive force from the first electromotive force, and the second corrected electromotive force being obtained by subtracting the reference electromotive force from the second electromotive force.

2 . The display device according to claim 1 ,

wherein the control unit individually controls an intensity of light emitted from the plurality of light-emitting elements in accordance with at least a first grayscale value, and a second grayscale value different from the first grayscale value,

the measuring unit further measures a first grayscale electromotive force and a second grayscale electromotive force, both of which are electromotive forces of the solar cell, the first grayscale electromotive force being observed when the control unit causes all of the plurality of the light-emitting elements to emit light in accordance with the first grayscale value, and the second grayscale electromotive force being observed when the control unit causes all of the plurality of the light-emitting elements to emit light in accordance with the second grayscale value, and

the control unit further corrects the control signal corresponding to at least one of the plurality of light-emitting elements so that a ratio of a first grayscale corrected electromotive force to a second grayscale corrected electromotive force at present time is close to a previously determined ratio of the first grayscale corrected electromotive force to the second grayscale corrected electromotive force, the first grayscale corrected electromotive force being obtained by subtracting the reference electromotive force from the first grayscale electromotive force, and the second grayscale corrected electromotive force being obtained by subtracting the reference electromotive force from the second grayscale electromotive force.

3 . The display device according to claim 2 ,

wherein the measuring unit further measures a third grayscale electromotive force and a fourth grayscale electromotive force, both of which are electromotive forces of the solar cell, the third grayscale electromotive force being observed when the control unit causes a portion of the plurality of light-emitting elements to emit light in accordance with the first grayscale value, and the fourth grayscale electromotive force being observed when the control unit causes the portion of the plurality of light-emitting elements to emit light in accordance with the second grayscale value, and

the control unit further corrects the control signal corresponding to at least one of the plurality of light-emitting elements so that a ratio of the first grayscale corrected electromotive force to the second grayscale corrected electromotive force to a third grayscale corrected electromotive force to a fourth grayscale corrected electromotive force at present time is close to a previously determined ratio of the first grayscale corrected electromotive force to the second grayscale corrected electromotive force to the third grayscale corrected electromotive force to the fourth grayscale corrected electromotive force, the third grayscale corrected electromotive force being obtained by subtracting the reference electromotive force from the third grayscale electromotive force, and the fourth grayscale corrected electromotive force being obtained by subtracting the reference electromotive force from the fourth grayscale electromotive force.

4 . A display device, comprising:

a display panel comprising a plurality of light-emitting elements, the plurality of light-emitting elements comprising a plurality of first region light-emitting elements formed in a first region that is a first portion of a display region in the display panel, and a plurality of second region light-emitting elements formed in a second region that is a second portion of the display region in the display panel, the second region being different from the first region;

at least one solar cell configured to receive light from the plurality of light-emitting elements;

a measuring unit configured to measure an output from the at least one solar cell; and

a control unit configured to individually control emission of light from the plurality of light-emitting elements using one or more control signals,

wherein:

the measuring unit is further configured to measure a reference electromotive force that is an electromotive force generated by the solar cell and observed when the control unit causes all of the plurality of the light-emitting elements to stop emitting light, and to measure a third electromotive force and a fourth electromotive force, both of which are electromotive forces of the solar cell, the third electromotive force being observed when the control unit causes all the first region light-emitting elements alone to emit light, and the second electromotive force being observed when the control unit causes all the second region light-emitting elements alone to emit light, and

the control unit corrects a control signal corresponding to at least one of the plurality of light-emitting elements in accordance with one or more measurements by the measuring unit, so that a ratio of a third corrected electromotive force to a fourth corrected electromotive force at present time is close to a ratio of the third corrected electromotive force to the fourth corrected electromotive force at time of shipment, the third corrected electromotive force being obtained by subtracting the reference electromotive force from the third electromotive force, and the fourth corrected electromotive force being obtained by subtracting the reference electromotive force from the fourth electromotive force.

5 . The display device according to claim 4 ,

wherein the control unit individually controls an intensity of light emitted from the light-emitting elements in accordance with at least a first grayscale value and a second grayscale value different from the first grayscale value,

the measuring unit further measures a first grayscale electromotive force and a second grayscale electromotive force, both of which are electromotive forces of the solar cell, the first grayscale electromotive force being observed when the control unit causes all of the plurality of the light-emitting elements to emit light in accordance with the first grayscale value, and the second grayscale electromotive force being observed when the control unit causes all of the plurality of the light-emitting elements to emit light in accordance with the second grayscale value, and

the control unit further corrects the control signal corresponding to at least one of the plurality of light-emitting elements so that a ratio of a first grayscale corrected electromotive force to a second grayscale corrected electromotive force at present time is close to a previously determined ratio of the first grayscale corrected electromotive force to the second grayscale corrected electromotive force, the first grayscale corrected electromotive force being obtained by subtracting the reference electromotive force from the first grayscale electromotive force, and the second grayscale corrected electromotive force being obtained by subtracting the reference electromotive force from the second grayscale electromotive force.

6 . The display device according to claim 5 ,

wherein the measuring unit further measures a third grayscale electromotive force and a fourth grayscale electromotive force, both of which are electromotive forces of the solar cell, the third grayscale electromotive force being observed when the control unit causes a portion of the plurality of the light-emitting elements to emit light in accordance with the first grayscale value, and the fourth grayscale electromotive force being observed when the control unit causes the portion of the plurality of the light-emitting elements to emit light in accordance with the second grayscale value, and

the control unit further corrects the control signal corresponding to at least one of the plurality of the light-emitting elements so that a ratio of the first grayscale corrected electromotive force to the second grayscale corrected electromotive force to a third grayscale corrected electromotive force to a fourth grayscale corrected electromotive force at present time is close to a previously determined ratio of the first grayscale corrected electromotive force to the second grayscale corrected electromotive force to the third grayscale corrected electromotive force to the fourth grayscale corrected electromotive force, the third grayscale corrected electromotive force being obtained by subtracting the reference electromotive force from the third grayscale electromotive force, and the fourth grayscale corrected electromotive force being obtained by subtracting the reference electromotive force from the fourth grayscale electromotive force.

7 . A display device, comprising:

a display panel comprising a plurality of light-emitting elements, the light-emitting elements comprising:

a plurality of first region light-emitting elements formed in a first region that is a first portion of a display region in the display panel, the first region light-emitting elements comprising fifth light-emitting elements configured to emit light in a first color, and sixth light-emitting elements configured to emit light in a second color different from the first color, and

a plurality of second region light-emitting elements formed in a second region that is a second portion of the display region in the display panel, the second region being different from the first region, the second region light-emitting elements comprising seventh light-emitting elements configured to emit light in the first color, and eighth light-emitting elements configured to emit light in the second color different from the first color;

at least one solar cell configured to receive light from the plurality of light-emitting elements;

a measuring unit configured to measure an output from the at least one solar cell; and

a control unit configured to individually control emission of light from the plurality of light-emitting elements using one or more control signals,

wherein:

the measuring unit is further configured to measure a reference electromotive force that is an electromotive force generated by the solar cell and observed when the control unit causes all of the plurality of the light-emitting elements to stop emitting light, and

to measure a fifth electromotive force, a sixth electromotive force, a seventh electromotive force, and an eighth electromotive force, all of which are electromotive forces of the solar cell, the fifth electromotive force being observed when the control unit causes all the fifth light-emitting elements alone to emit light, the sixth electromotive force being observed when the control unit causes all the sixth light-emitting elements alone to emit light, the seventh electromotive force being observed when the control unit causes all the seventh light-emitting elements alone to emit light, and the eighth electromotive force being observed when the control unit causes all the eighth light-emitting elements alone to emit light, and

the control unit corrects a control signal corresponding to at least one of the plurality of light-emitting elements in accordance with one or more measurements by the measuring unit, so that a ratio of a fifth corrected electromotive force to a sixth corrected electromotive force to a seventh corrected electromotive force to an eighth corrected electromotive force at present time is close to a ratio of the fifth corrected electromotive force to the sixth corrected electromotive force to the seventh corrected electromotive force to the eighth corrected electromotive force at time of shipment, the fifth corrected electromotive force being obtained by subtracting the reference electromotive force from the fifth electromotive force, the sixth corrected electromotive force being obtained by subtracting the reference electromotive force from the sixth electromotive force, the seventh corrected electromotive force being obtained by subtracting the reference electromotive force from the seventh electromotive force, and the eighth corrected electromotive force being obtained by subtracting the reference electromotive force from the eighth electromotive force.

8 . The display device according to claim 7 ,

wherein the control unit individually controls an intensity of light emitted from the plurality of the light-emitting elements in accordance with at least a first grayscale value and a second grayscale value different from the first grayscale value,

the measuring unit further measures a first grayscale electromotive force and a second grayscale electromotive force, both of which are electromotive forces of the solar cell, the first grayscale electromotive force being observed when the control unit causes all the plurality of the light-emitting elements to emit light in accordance with the first grayscale value, and the second grayscale electromotive force being observed when the control unit causes all the plurality of the light-emitting elements to emit light in accordance with the second grayscale value, and

the control unit further corrects the control signal corresponding to at least one of the plurality of the light-emitting elements so that a ratio of a first grayscale corrected electromotive force to a second grayscale corrected electromotive force at present time is close to a previously determined ratio of the first grayscale corrected electromotive force to the second grayscale corrected electromotive force, the first grayscale corrected electromotive force being obtained by subtracting the reference electromotive force from the first grayscale electromotive force, and the second grayscale corrected electromotive force being obtained by subtracting the reference electromotive force from the second grayscale electromotive force.

9 . The display device according to claim 8 ,

wherein the measuring unit further measures a third grayscale electromotive force and a fourth grayscale electromotive force, both of which are electromotive forces of the solar cell, the third grayscale electromotive force being observed when the control unit causes a portion of the plurality of the light-emitting elements to emit light in accordance with the first grayscale value, and the fourth grayscale electromotive force being observed when the control unit causes the portion of the plurality of the light-emitting elements to emit light in accordance with the second grayscale value, and

the control unit further corrects the control signal corresponding to at least one of the plurality of the light-emitting elements so that a ratio of the first grayscale corrected electromotive force to the second grayscale corrected electromotive force to a third grayscale corrected electromotive force to a fourth grayscale corrected electromotive force at present time is close to a previously determined ratio of the first grayscale corrected electromotive force to the second grayscale corrected electromotive force to the third grayscale corrected electromotive force to the fourth grayscale corrected electromotive force, the third grayscale corrected electromotive force being obtained by subtracting the reference electromotive force from the third grayscale electromotive force, and the fourth grayscale corrected electromotive force being obtained by subtracting the reference electromotive force from the fourth grayscale electromotive force.