Signal processing apparatus, signal processing method, and display apparatus

1. A signal processing apparatus comprising:

a signal processing unit configured to

acquire, in changing a video signal from a low luminance display signal to a high luminance display signal by luminance enhancement, an accumulated load increase amount obtained by measuring and accumulating amounts of increase in load on a display panel caused by luminance enhancement, and

adaptively control, in reference to the accumulated load increase amount acquired, a first gain for improving luminance of the video signal, according to a degree of effect of deterioration in element of the display panel, wherein

the signal processing unit additionally adds the first gain to a second gain that is used for luminance enhancement, to thereby enhance the luminance of the video signal.

2. The signal processing apparatus according to claim 1 , wherein the signal processing unit acquires the accumulated load increase amount in which information regarding a surface temperature of the display panel is taken into account.

3. The signal processing apparatus according to claim 2 , wherein the display panel is provided with one or multiple temperature sensors configured to measure the surface temperature.

4. The signal processing apparatus according to claim 1 , wherein the signal processing unit acquires the accumulated load increase amount in which information regarding a current flowing through the display panel is taken into account.

5. The signal processing apparatus according to claim 1 , wherein the signal processing unit uses, as the first gain, a value based on a third gain linked to the accumulated load increase amount.

6. The signal processing apparatus according to claim 5 , wherein the signal processing unit uses, as the first gain, a value obtained by multiplying the third gain by a fourth gain that is used as a reference for luminance improvement.

7. The signal processing apparatus according to claim 1 , wherein

the signal processing unit is configured to

calculate, according to the load that is increased due to luminance enhancement, an additional value for accumulation, and

add together the additional value calculated of each image frame to calculate an accumulated value of load increase amounts.

8. The signal processing apparatus according to claim 7 , wherein the signal processing unit calculates a larger additional value for a higher load to make a correlation with an element deterioration amount.

9. The signal processing apparatus according to claim 7 , wherein the signal processing unit calculates a constant additional value to measure a length of time in which luminance enhancement has been carried out.

10. The signal processing apparatus according to claim 7 , further comprising:

a memory configured to store data regarding the accumulated value.

11. The signal processing apparatus according to claim 7 , wherein the signal processing unit calculates the accumulated value of load increase amounts of each of predetermined regions on a screen of the display panel.

12. The signal processing apparatus according to claim 1 , wherein the signal processing unit performs control for reducing the first gain when an accumulated value of load increase amounts exceeds a predetermined value in a case where luminance enhancement has been carried out over a period longer than a predetermined period.

13. The signal processing apparatus according to claim 12 , wherein the signal processing unit controls, according to a maximum value of the accumulated value of each of predetermined regions on a screen of the display panel, the first gain for an entirety of the screen.

14. The signal processing apparatus according to claim 12 , wherein the signal processing unit controls, according to the accumulated value of each of predetermined regions on a screen of the display panel, the first gain for each of the predetermined regions.

15. A signal processing method comprising:

by a signal processing apparatus,

acquiring, in changing a video signal from a low luminance display signal to a high luminance display signal by luminance enhancement, an accumulated load increase amount obtained by measuring and accumulating amounts of increase in load on a display panel caused by luminance enhancement;

adaptively controlling, in reference to the accumulated load increase amount acquired, a first gain for improving luminance of the video signal, according to a degree of effect of deterioration in element of the display panel; and

additionally adding the first gain to a second gain that is used for luminance enhancement, to thereby enhance the luminance of the video signal.

16. A display apparatus comprising:

a signal processing unit configured to process a video signal; and

a panel unit including a display panel configured to display video based on the video signal, wherein

the signal processing unit is configured to

acquire, in changing the video signal from a low luminance display signal to a high luminance display signal by luminance enhancement, an accumulated load increase amount obtained by measuring and accumulating amounts of increase in load on the display panel caused by luminance enhancement,

adaptively control, in reference to the accumulated load increase amount acquired, a first gain for improving luminance of the video signal, according to a degree of effect of deterioration in element of the display panel, and

additionally add the first gain to a second gain that is used for luminance enhancement, to thereby enhance the luminance of the video signal.

17. The display apparatus according to claim 16 , wherein the panel unit includes an OLED display panel.