Signal processing device, signal processing method, and display device
Provided is a signal processing device including a signal processing unit that, when increasing the luminance of an video signal from a low-luminance display signal to a high-luminance display signal, acquires information regarding at least one of luminance enhancement time obtained by measuring the time for enhancing the luminance on a display panel, the temperature rise amount of the display panel, and the feature amount of the video signal corresponding to video displayed on the display panel, and adaptively controls a first gain for enhancing the luminance of the video signal, according to the degree of influence on the temperature rise of the display panel, in reference to the acquired information. The present technique can be applied to a self-luminous display device, for example.
1 . A signal processing device comprising:
circuitry configured to perform:
acquiring information regarding luminance enhancement time obtained by measuring time for enhancing luminance on a display panel and a temperature rise amount of the display panel, when increasing luminance of the video signal from a low-luminance display signal to a high luminance display signal, and
adaptively controlling a first gain for enhancing the luminance of the video signal, according to a degree of influence on a temperature rise of the display panel, in reference to the acquired information,
wherein the circuitry is configured to calculate an integration step value according to a level of the video signal, in which the integration step value being a negative integration step value in a low-value region at input video signals below a threshold input video signal level of the video signal and a positive integration step in a high value region at input video signal values above the threshold input video signal level;
integrate the calculated integration step value in a time axis direction to calculate an integrated value according to the luminance enhancement time, and
apply the calculated integrated value to assist in controlling the first gain for enhancing the luminance of the video signal.
2 . The signal processing device according to claim 1 , wherein
the circuitry configured to achieve high luminance of the video signal by supplementarily adding the first gain to a second gain used for obtaining the high luminance.
3 . The signal processing device according to claim 2 , wherein
the circuitry configure to use as the first gain a value corresponding to a linked gain that is linked to information regarding at least one of the luminance enhancement time, the temperature rise amount, and a feature amount of a video signal according to video displayed on the display panel in which the feature amount is also used in acquiring the information and includes a measurement result of a current flowing through the panel.
4 . The signal processing device according to claim 3 , wherein,
when multiple linked gains are present, the circuitry configure to use a value obtained by multiplying values of the multiple linked gains together or a minimum value among values of the multiple linked gains, as the first gain.
5 . The signal processing device according to claim 1 , wherein the calculated integration step value is a step function having the low value region at input video signal values below the threshold input video signal value and the high value region at input video signal values above the threshold input video signal.
6 . The signal processing device according to claim 5 , wherein
the circuitry is configured to calculate the integrated value according to the luminance enhancement time for each predetermined area on a screen of the display panel.
7 . The signal processing device according to claim 1 , wherein the circuitry is configured to calculate an integration step value to be used when integration is performed according to a load that increases due to high luminance, and
calculate an integrated value according to the temperature rise by integrating the calculated integration step value in a time axis direction, wherein the calculated integration step value is a step function having the low value region at input video signal values below the threshold input video signal value and the high value region at input video signal values above the threshold input video signal.
8 . The signal processing device according to claim 7 , wherein the circuitry is configured to set the positive integration step value corresponding to a high load state to be larger than a predetermined value, and sets the negative integration step value corresponding to a low load state in which a load is lower than the high load state to be smaller than a predetermined value, in order to correlate the integration step value with the temperature rise.
9 . The signal processing device according to claim 7 , wherein
the circuitry is configured to calculate the integrated value according to the temperature rise for each predetermined area on a screen of the display panel.
10 . The signal processing device according to claim 7 , wherein
the circuitry is configured to calculate the integrated value according to the temperature rise, in view of information regarding a temperature obtained by predicting the load of the video or measurement by a temperature sensor provided on the display panel.
11 . The signal processing device according to claim 10 , wherein
one or multiple temperature sensors for measuring a surface temperature are provided on the display panel.
12 . The signal processing device according to claim 3 , wherein
the feature amount includes an APL.
13 . The signal processing device according to claim 12 , wherein
the circuitry is configured to measure the APL for an entire screen of the display panel or for each predetermined area on the screen.
14 . The signal processing device according to claim 3 , wherein
the circuitry is configured to determine the linked gain that is linked to the feature amount, in view of a measurement result of a current flowing through the display panel.
15 . A signal processing method comprising: by a signal processing apparatus, acquiring information regarding luminance enhancement time obtained by measuring time for enhancing luminance on a display panel and a temperature rise amount of the display panel, when increasing luminance of the video signal from a low-luminance display signal to a high-luminance display signal;
adaptively controlling a first gain for enhancing the luminance of the video signal, according to a degree of influence on a temperature rise of the display panel, in reference to the acquired information;
calculating an integration step value according to a level of the video signal, the integration step value being a negative integration step value in a low-value region at input video signal values below a threshold input video signal level and a positive integration step value in a high-value region at input video signal values above the threshold input video signal level;
integrating the calculated integration step value in a time axis direction to calculate an integrated value according to the luminance enhancement time; and
applying the calculated integrated value to assist in controlling the first gain for enhancing the luminance of the video signal.
16 . A display device comprising:
a signal processing apparatus that processes a video signal;
a display panel that displays video corresponding to the video signal; and circuitry of the signal processing apparatus that is configured to
acquire information regarding luminance enhancement time obtained by measuring time for enhancing luminance on a display panel and a temperature rise amount of the display panel, when increasing luminance of the video signal from a low-luminance display signal to a high-luminance display signal,
adaptively control a first gain for enhancing the luminance of the video signal, according to a degree of influence on a temperature rise of the display panel, in reference to the acquired information, and
calculate an integration step value according to a level of the video signal, the integration step value being a negative integration step value in a low-value region at input video signal values below a threshold input video signal level and a positive integration step value in a high-value region at input video signal values above the threshold input video signal level,
integrate the calculated integration step value in a time axis direction to calculate an integrated value according to the luminance enhancement time, and
apply the calculated integrated value to assist in controlling the first gain for enhancing the luminance of the video signal.
17 . The display device according to claim 16 , wherein
the panel is an OLED display panel.
18 . The signal processing device according to claim 1 , comprising at least one temperature sensor that measures the temperature rise amount located in a central portion of a screen of the display panel.
19 . The display device according to claim 17 , wherein
the display panel comprises sub-pixels or white, red, green, and blue.
20 . The signal processing device according to claim 1 , wherein
the temperature rise amount is based on a detection of an increase in luminance.