Signal processing device, signal processing method, and display device

1 . A display comprising:

a self-luminous display panel that includes a plurality of pixels that each includes a group of subpixels; and

signal processing circuitry that is configured to:

determine for display of video, when black insertion driving of the self-luminous display panel is to be employed; and

determine for display of video, when normal driving of the self-luminous display panel is to be employed,

wherein:

the signal processing circuitry determines that the normal driving is to be employed when a still image portion of the video is determined,

the signal processing circuitry determines that the black insertion driving is to be employed when a moving image of the video is determined, and

the signal processing circuitry controls luminance compensation, during black insertion driving, in an average pixel level of the video and is employed such that the average pixel level includes two linear functions connected at an intermediate average pixel level, the first linear function has the average pixel level increasing at a first rate from a minimum average pixel level to the intermediate average pixel level with respect to decreasing light emission duty and the second linear function has the average pixel level increasing at a different second rate from the intermediate average pixel level to a maximum average pixel level with respect to further decreasing light emission duty.

2 . The display according to claim 1 , wherein

the signal processing circuitry is further configured to perform the luminance compensation by controlling a gain based on light emission duty value of the self-luminous display panel.

3 . The display according to claim 2 , wherein the gain for the black insertion driving is greater than the gain for the normal driving.

4 . The display according to claim 2 , wherein the light emission duty value is based on a motion amount of an object displayed on the self-luminous display panel.

5 . The display according to claim 4 , wherein the signal processing circuitry is further configured to:

reduce the light emission duty value as the motion amount increases, and

raise the gain in response to the reduction in the light emission duty value.

6 . The display according to claim 2 , wherein the light emission duty value is based on a detail level of the video displayed on the self-luminous display panel.

7 . The display according to claim 6 , wherein the signal processing circuitry is further configured to:

reduce the light emission duty value as the detail level increases, and

raise the gain in response to the reduction in the light emission duty value.

8 . The display according to claim 2 , wherein the light emission duty value is based on a saturation level of the video displayed on the self-luminous display panel.

9 . The display according to claim 8 , wherein the signal processing circuitry is further configured to set a limit on a lower limit value of the light emission duty value based on the saturation level.

10 . The display according to claim 2 , wherein the light emission duty value is based on the average pixel level of the video in which the first rate is steeper than the different second rate.

11 . The display according to claim 10 , wherein,

in a case where the average pixel level is less than a specific level, the signal processing circuitry is further configured to:

set a limit on a lower limit value of the light emission duty value, and

raise the light emission duty value as the average pixel level decreases.

12 . The display according to claim 2 , wherein the signal processing circuitry configured to control a current flow through a self-luminous element in the self-luminous display panel so as to suppress, based on the gain, a peak current within an allowable peak current value of a power supply circuit.

13 . The display according to claim 12 , wherein the signal processing circuitry is further configured to control the peak current not to exceed a peak current limit value in a case where the peak current becomes maximum when a light emission area of the self-luminous display panel varies within one frame of the video and fluctuation of current occurs.

14 . The display according to claim 13 , wherein the signal processing circuitry is further configured to control such that the gain becomes a value obtained by division of the peak current limit value by an average current limit value.

15 . The display according to claim 2 , wherein the signal processing circuitry configured to calculate, based on the light emission duty value, an offset value regarding luminance of the video.

16 . The display according to claim 15 , wherein the signal processing circuitry is further configured to decrease, based on the calculated offset value, the luminance at a low gradation level.

17 . The display according to claim 2 , wherein the gain is obtained by a reciprocal of the light emission duty value.

18 . The display according to claim 2 , wherein

the group of subpixels includes a first sub-pixel that generates red (R) light, a second sub-pixel that generates green (G) light, a third sub-pixel that generates blue (B) light, and a fourth sub-pixel that generates white (W) light.

19 . The display according to claim 18 , wherein

each pixel of the plurality of pixels includes an organic light emitting diode (OLED) element as a self-luminous element.

20 . The display according to claim 18 , wherein the plurality of sub-pixels is in a two-dimensional arrangement.