DLPU115 January   2022 DLPC3421

 

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3.3.3.2 Write Parameters

Table 3-34 describes the command parameters.

Table 3-34 Write Parameters
Parameter BytesDescription
Byte 1See Figure 3-46
Byte 2CAIC maximum lumens gain
Byte 3CAIC clipping threshold
Figure 3-46 Byte 1 Write Parameters
MSBByte 1LSB
b7b6b5b4b3b2b1b0
b(7)

CAIC gain display enable:

  • 0h: Disabled
  • 1h: Enabled

b(6)CAIC gain display scale:
  • 0h: 100% = 1024 pixels
  • 1h: 100% = 512 pixels
b(5:0)Reserved

The CAIC algorithm (Content Adaptive Illumination Control) provides adaptive control of the LED currents and the digital gain applied to the image.

The CAIC algorithm is enabled or disabled based on the method of LED current control selected by the OEM using the Write LED Output Control Method command. When enabled, the CAIC algorithm provides automatic control of the LED currents as specified by this command and the Write LED Output Control Method command.

The CAIC gain display provides a visual presentation of the instantaneous gain provided by the CAIC algorithm. The CAIC gain display is typically used as a debug tool and to show the performance of the algorithm; The CAIC gain display must never be used for normal operation. The display is composed of five bars, with the bottom three bars (green, red, and blue) showing the respective CAIC gain for each color. The top two bars are for TI debug use only. For the software, the CAIC gain display enable is controlled by CAIC_DEBUG_MODE (2:0), where disabled = 0h, and enabled = 3h. The display scale is set using CAIC_DEBUG_MODE(3).

Figure 3-47 shows the bit order and weighting for the CAIC maximum lumens gain value, which has a valid range from 1.0 to 4.0. Values outside of this range are considered an error (invalid command parameter value – communication status) and the command does not execute.

Figure 3-47 Bit Weight Definition for the CAIC Maximum Gain Value
b7b6b5b4b3b2b1b0
2221202–12–22–32–42–5

The CAIC maximum lumens gain parameter sets the maximum lumens gain for a pixel as a result of both digital gain and increasing LED currents. The CAIC maximum lumens gain parameter also serves to bias the CAIC algorithm towards either constant power (variable brightness) or constant lumens (variable power). Some examples are listed below:

  • Maximum gain value = 1.0: This biases performance to constant lumens. In this case, LED power is reduced for those images where this is possible, but lumens do not increase or decrease.
  • Maximum lumens gain value = 4.0: This biases performance to constant power. In this case, power is held constant for most images, while the lumens are gained up. For the small percent of images where the gain exceeds 4.0, lumens stop increasing and the power is reduced.

Figure 3-48 shows the bit order and weighting for the CAIC clipping threshold value, which has a valid range from 0.0% to 4.0%. Values outside of this range are considered an error (invalid command parameter value – communication status) and the command does not execute.

Figure 3-48 Bit Weight Definition for the CAIC Clipping Threshold Value
b7b6b5b4b3b2b1b0
21202–12–22–32–42–52–6

The CAIC clipping threshold parameter sets the percentage of pixels clipped by the CAIC algorithm over the full frame of active data, due to the digital gain applied by the CAIC algorithm.

Figure 3-49 shows the bit order and weighting for the CAIC RGB intensity gain values, which have a valid range from 0.0 to almost 1.0. Values outside of this range are considered an error (invalid command parameter value – communication status) and the command does not execute.

Figure 3-49 Bit Weight Definition for the CAIC RGB Intensity Gain Values
b15b14b13b12b11b10b9b8b7b6b5b4b3b2b1b0
ResResResResResRes2–12–22–32–42–52–62–72–82–92–10

CAIC can be enabled in TPG and external input mode, but auto-disabled in splash and curtain mode.

Table 3-35 LABB and CAIC Modes
FeatureTPGSplashCurtainExternal Input
LABBSupportedSupportedAuto-disabledSupported
CAICSupportedAuto-disabledAuto-disabledSupported
Manual idle modeSupportedSupportedAuto-disabledSupported