Signal processing apparatus, display apparatus, electronic apparatus, signal processing method and program

1. A signal processing apparatus, comprising:

a luminance degradation information production section, containing an updating portion and a retaining portion, adapted to produce and successively update luminance degradation information regarding degradation of a luminance of light from a light emitting element in a pixel circuit in accordance with a temperature condition upon emission based on an ambient temperature of the pixel circuit and a luminance value, which degrades in response to elapsed time, of a particular light emitting element which is driven to emit light with a particular gradation value;

a luminance degradation value calculation section adapted to calculate a luminance degradation value regarding degradation of the luminance for each pixel circuit based on a luminance characteristic indicative of a characteristic of a correlation between an image signal supplied to the pixel circuit which is in a predetermined state and the luminance of light emitted from the pixel circuit in response to the image signal and the luminance degradation information produced by said luminance degradation information production section; and

a correction section adapted to correct the gradation value of the image signal to be inputted to the pixel circuit based on the luminance degradation value; and

wherein said luminance degradation information production section includes

a luminance degradation characteristic production section adapted to produce a luminance degradation characteristic regarding degradation of the luminance of the pixel circuit at a particular temperature based on a measurement temperature when the luminance value is measured and the luminance value; and

an addition section adapted to successively add a new degradation amount regarding the degradation of the luminance of the pixel circuit to the luminance degradation information based on the ambient temperature, the luminance degradation characteristic, luminance degradation information produced with regard to the pixel circuit before the correction and the gradation value of the image signal inputted to the pixel circuit to produce new luminance degradation information.

2. The signal processing apparatus according to claim 1 , wherein said luminance degradation characteristic production section produces the luminance degradation characteristic in a temperature condition different from the measurement temperature based on the measurement temperature when the luminance value is measured and the luminance value.

3. The signal processing apparatus according to claim 1 , further comprising:

an image signal supplying section adapted to supply an image signal to said particular light emitting element in response to the measurement temperature;

said luminance degradation characteristic production section producing the luminance degradation characteristic of the pixel circuit at the particular temperature based on a luminance value, which degrades in response to the elapsed time, of said particular light emitting element when the measurement temperature becomes the particular temperature.

4. The signal processing apparatus according to claim 1 , wherein said luminance degradation characteristic production section produces the luminance degradation characteristic of the pixel circuit at the particular temperature based on the luminance value, which degrades in response to the elapsed time, of said particular light emitting element in a state in which the ambient temperature of said particular light emitting element is the particular temperature.

5. The signal processing apparatus according to claim 1 , wherein the predetermined state is a state in which the pixel circuit suffers from no degradation of the luminance.

6. A display apparatus, comprising:

a signal processing circuit adapted to correct a gradation value of an image signal;

a plurality of pixel circuits each including a light emitting element which emits light, when driving current according to the image signal is supplied thereto, with a luminance corresponding to the driving current; and

a particular pixel circuit including a particular light emitting element which emits light in response to a light emission signal of a particular gradation value,

said signal processing circuit including

a luminance degradation information production section, containing an updating portion and a retaining portion, adapted to produce and successively update luminance degradation information regarding degradation of a luminance of light from the light emitting element in each of the pixel circuits in accordance with a temperature condition upon emission based on an ambient temperature of the pixel circuit and a luminance value, which degrades in response to elapsed time, of the particular light emitting element of said particular pixel circuit,

a luminance degradation value calculation section adapted to calculate a luminance degradation value regarding degradation of the luminance for each of the pixel circuits based on a luminance characteristic indicative of a characteristic of a correlation between the image signal supplied to the pixel circuit which is in a predetermined state and the luminance of light emitted from the pixel circuit in response to the image signal and the luminance degradation information produced by said luminance degradation information production section, and

a correction section adapted to correct the gradation value of the image signal to be inputted to the pixel circuit based on the luminance degradation value; and

wherein said luminance degradation information production section includes

a luminance degradation characteristic production section adapted to produce a luminance degradation characteristic regarding degradation of the luminance of the pixel circuit at a particular temperature based on a measurement temperature when the luminance value is measured and the luminance value; and

an addition section adapted to successively add a new degradation amount regarding the degradation of the luminance of the pixel circuit to the luminance degradation information based on the ambient temperature, the luminance degradation characteristic, luminance degradation information produced with regard to the pixel circuit before the correction and the gradation value of the image signal inputted to the pixel circuit to produce new luminance degradation information.

7. An electronic apparatus, comprising:

a signal processing circuit adapted to correct a gradation value of an image signal;

a plurality of pixel circuits each including a light emitting element which emits light, when driving current according to the image signal is supplied thereto, with a luminance corresponding to the driving current; and

a particular pixel circuit including a light emitting element which emits light in response to a light emission signal of a particular gradation value,

said signal processing circuit including

a luminance degradation information production section, containing an updating portion and a retaining portion, adapted to produce and successively update luminance degradation information regarding degradation of a luminance of light from the light emitting element in each of the pixel circuits in accordance with a temperature condition upon emission based on an ambient temperature of the pixel circuit and a luminance value, which degrades in response to elapsed time, of the light emitting element of said particular pixel circuit,

a luminance degradation value calculation section adapted to calculate a luminance degradation value regarding degradation of the luminance for each of the pixel circuits based on a luminance characteristic indicative of a characteristic of a correlation between the image signal supplied to the pixel circuit which is in a predetermined state and the luminance of light emitted from the pixel circuit in response to the image signal and the luminance degradation information produced by said luminance degradation information production section, and

a correction section adapted to correct the gradation value of the image signal to be inputted to the pixel circuit based on the luminance degradation value; and

wherein said luminance degradation information production section includes

a luminance degradation characteristic production section adapted to produce a luminance degradation characteristic regarding degradation of the luminance of the pixel circuit at a particular temperature based on a measurement temperature when the luminance value is measured and the luminance value; and

an addition section adapted to successively add a new degradation amount regarding the degradation of the luminance of the pixel circuit to the luminance degradation information based on the ambient temperature, the luminance degradation characteristic, luminance degradation information produced with regard to the pixel circuit before the correction and the gradation value of the image signal inputted to the pixel circuit to produce new luminance degradation information.

8. A signal processing method, comprising the steps of:

producing and successively updating luminance degradation information regarding degradation of a luminance of light from a light emitting element in a pixel circuit in accordance with a temperature condition upon emission based on an ambient temperature of the pixel circuit and a luminance value, which degrades in response to elapsed time, of a particular light emitting element which is driven to emit light with a particular gradation value;

calculating a luminance degradation value regarding degradation of the luminance for each pixel circuit based on a luminance characteristic indicative of a characteristic of a correlation between an image signal supplied to the pixel circuit which is in a predetermined state and the luminance of light emitted from the pixel circuit in response to the image signal and the luminance degradation information produced by the luminance degradation information production step;

correcting the gradation value of the image signal to be inputted to the pixel circuit based on the luminance degradation value;

producing a luminance degradation characteristic regarding degradation of the luminance of the pixel circuit at a particular temperature based on a measurement temperature when the luminance value is measured and the luminance value; and

adapting to successively add a new degradation amount regarding the degradation of the luminance of the pixel circuit to the luminance degradation information based on the ambient temperature, the luminance degradation characteristic, luminance degradation information produced with regard to the pixel circuit before the correction and the gradation value of the image signal inputted to the pixel circuit to produce new luminance degradation information.

9. A non-transitory computer readable medium storing a program, the program being executable by a processor to cause operations comprising:

producing and successively updating luminance degradation information regarding degradation of a luminance of light from a light emitting element in a pixel circuit in accordance with a temperature condition upon emission based on an ambient temperature of the pixel circuit and a luminance value, which degrades in response to elapsed time, of a particular light emitting element which is driven to emit light with a particular gradation value;

calculating a luminance degradation value regarding degradation of the luminance for each pixel circuit based on a luminance characteristic indicative of a characteristic of a correlation between an image signal supplied to the pixel circuit which is in a predetermined state and the luminance of light emitted from the pixel circuit in response to the image signal and the luminance degradation information produced by the luminance degradation information production step; and

correcting the gradation value of the image signal to be inputted to the pixel circuit based on the luminance degradation value;

producing a luminance degradation characteristic regarding degradation of the luminance of the pixel circuit at a particular temperature based on a measurement temperature when the luminance value is measured and the luminance value; and

adapting to successively add a new degradation amount regarding the degradation of the luminance of the pixel circuit to the luminance degradation information based on the ambient temperature, the luminance degradation characteristic, luminance degradation information produced with regard to the pixel circuit before the correction and the gradation value of the image signal inputted to the pixel circuit to produce new luminance degradation information.

10. A signal processing apparatus, comprising:

luminance degradation information production means for producing and successively updating luminance degradation information regarding degradation of a luminance of light from a light emitting element in a pixel circuit in accordance with a temperature condition upon emission based on an ambient temperature of the pixel circuit and a luminance value, which degrades in response to elapsed time, of a particular light emitting element which is driven to emit light with a particular gradation value;

luminance degradation value calculation means for calculating a luminance degradation value regarding degradation of the luminance for each pixel circuit based on a luminance characteristic indicative of a characteristic of a correlation between an image signal supplied to the pixel circuit which is in a predetermined state and the luminance of light emitted from the pixel circuit in response to the image signal and the luminance degradation information produced by said luminance degradation information production means; and

correction means for correcting the gradation value of the image signal to be inputted to the pixel circuit based on the luminance degradation value; and

wherein said luminance degradation information production section includes:

a luminance degradation characteristic production section adapted to produce a luminance degradation characteristic regarding degradation of the luminance of the pixel circuit at a particular temperature based on a measurement temperature when the luminance value is measured and the luminance value; and

an addition section adapted to successively add a new degradation amount regarding the degradation of the luminance of the pixel circuit to the luminance degradation information based on the ambient temperature, the luminance degradation characteristic, luminance degradation information produced with regard to the pixel circuit before the correction and the gradation value of the image signal inputted to the pixel circuit to produce new luminance degradation information.

11. The display apparatus according to claim 6 , wherein said luminance degradation characteristic production section produces the luminance degradation characteristic in a temperature condition different from the measurement temperature based on the measurement temperature when the luminance value is measured and the luminance value.

12. The display apparatus according to claim 6 , further comprising:

an image signal supplying section adapted to supply an image signal to said particular light emitting element in response to the measurement temperature;

said luminance degradation characteristic production section producing the luminance degradation characteristic of the pixel circuit at the particular temperature based on a luminance value, which degrades in response to the elapsed time, of said particular light emitting element when the measurement temperature becomes the particular temperature.

13. The display apparatus according to claim 6 , wherein said luminance degradation characteristic production section produces the luminance degradation characteristic of the pixel circuit at the particular temperature based on the luminance value, which degrades in response to the elapsed time, of said particular light emitting element in a state in which the ambient temperature of said particular light emitting element is the particular temperature.

14. The display apparatus according to claim 6 , wherein the predetermined state is a state in which the pixel circuit suffers from no degradation of the luminance.

15. The electronic apparatus according to claim 7 , wherein said luminance degradation characteristic production section produces the luminance degradation characteristic in a temperature condition different from the measurement temperature based on the measurement temperature when the luminance value is measured and the luminance value.

16. The electronic apparatus according to claim 7 , further comprising:

an image signal supplying section adapted to supply an image signal to said particular light emitting element in response to the measurement temperature;

said luminance degradation characteristic production section producing the luminance degradation characteristic of the pixel circuit at the particular temperature based on a luminance value, which degrades in response to the elapsed time, of said particular light emitting element when the measurement temperature becomes the particular temperature.

17. The electronic apparatus according to claim 7 , wherein said luminance degradation characteristic production section produces the luminance degradation characteristic of the pixel circuit at the particular temperature based on the luminance value, which degrades in response to the elapsed time, of said particular light emitting element in a state in which the ambient temperature of said particular light emitting element is the particular temperature.