JAJSF42B April   2018  – June 2019 DLPC3478


  1. 特長
  2. アプリケーション
  3. 概要
    1.     Device Images
      1.      標準的なスタンドアロン・システム
  4. 改訂履歴
  5. Pin Configuration and Functions
    1.     Pin Functions – Board Level Test, Debug, and Initialization
    2.     Pin Functions – Parallel Port Input Data and Control
    3.     Pin Functions - DSI Input Data and Clock
    4.     Pin Functions – DMD Reset and Bias Control
    5.     Pin Functions – DMD Sub-LVDS Interface
    6.     Pin Functions – Peripheral Interface
    7.     Pin Functions – GPIO Peripheral Interface
    8.     Pin Functions – Clock and PLL Support
    9.     Pin Functions – Power and Ground
  6. Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics over Recommended Operating Conditions
    6. 6.6  Electrical Characteristics
    7. 6.7  High-Speed Sub-LVDS Electrical Characteristics
    8. 6.8  Low-Speed SDR Electrical Characteristics
    9. 6.9  System Oscillators Timing Requirements
    10. 6.10 Power-Up and Reset Timing Requirements
    11. 6.11 Parallel Interface Frame Timing Requirements
    12. 6.12 Parallel Interface General Timing Requirements
    13. 6.13 BT656 Interface General Timing Requirements
    14. 6.14 Flash Interface Timing Requirements
  7. Parameter Measurement Information
    1. 7.1 HOST_IRQ Usage Model
    2. 7.2 Input Source
      1. 7.2.1 Input Source - Frame Rates and 3-D Display Orientation
      2. 7.2.2 Parallel Interface Supports Six Data Transfer Formats
        1. PDATA Bus – Parallel Interface Bit Mapping Modes
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Pattern Display
        1. External Pattern Mode
          1. 8-bit Monochrome Patterns
          2. 1-Bit Monochrome Patterns
        2. Internal Pattern Mode
          1. Free Running Mode
          2. Trigger In Mode
      2. 8.3.2 Interface Timing Requirements
        1. Parallel Interface
    4. 8.4 Serial Flash Interface
      1. 8.4.1  Serial Flash Programming
      2. 8.4.2  SPI Signal Routing
      3. 8.4.3  I2C Interface Performance
      4. 8.4.4  Content-Adaptive Illumination Control
      5. 8.4.5  Local Area Brightness Boost
      6. 8.4.6  3-D Glasses Operation
      7. 8.4.7  DMD (Sub-LVDS) Interface
      8. 8.4.8  Calibration and Debug Support
      9. 8.4.9  DMD Interface Considerations
      10. 8.4.10 Device Functional Modes
  9. Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 DLPC3478 System Design Consideration
    2. 9.2 Typical Application
      1. 9.2.1 3D Depth Scanner with DLP Using External Pattern Streaming Mode
        1. Design Requirements
        2. Detailed Design Procedure
        3. Application Curve
      2. 9.2.2 3D Depth Scanner Using Internal Pattern Streaming Mode
        1. Design Requirements
        2. Detailed Design Procedure
        3. Application Curve
  10. 10Power Supply Recommendations
    1. 10.1 System Power-Up and Power-Down Sequence
    2. 10.2 DLPC3478 Power-Up Initialization Sequence
    3. 10.3 DMD Fast PARK Control (PARKZ)
    4. 10.4 Hot Plug Usage
    5. 10.5 Maximum Signal Transition Time
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 PCB Layout Guidelines for Internal ASIC PLL Power
      2. 11.1.2 DLPC3478 Reference Clock
        1. Recommended Crystal Oscillator Configuration
      3. 11.1.3 General PCB Recommendations
      4. 11.1.4 General Handling Guidelines for Unused CMOS-Type Pins
      5. 11.1.5 Maximum Pin-to-Pin, PCB Interconnects Etch Lengths
      6. 11.1.6 Number of Layer Changes
      7. 11.1.7 Stubs
      8. 11.1.8 Terminations
      9. 11.1.9 Routing Vias
    2. 11.2 Layout Example
    3. 11.3 Thermal Considerations
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 デバイス・サポート
      1. 12.1.1 デベロッパー・ネットワークの製品に関する免責事項
      2. 12.1.2 デバイスの項目表記
        1. デバイスのマーキング
      3. 12.1.3 ビデオ・タイミング・パラメータの定義
    2. 12.2 関連リンク
    3. 12.3 コミュニティ・リソース
    4. 12.4 商標
    5. 12.5 静電気放電に関する注意事項
    6. 12.6 Glossary
  13. 13メカニカル、パッケージ、および注文情報



Content-Adaptive Illumination Control

Content-adaptive illumination control (CAIC) is an image processing algorithm that takes advantage of the fact that in common real-world image content most pixels in the images are well below full scale for the for the R, G, and B digital channels being input to the DLPC3478 device . As a result of this the average picture level (APL) for the overall image is also well below full scale, and the system’s dynamic range for the collective set of pixel values is not fully utilized. CAIC takes advantage of this headroom between the source image APL and the top of the available dynamic range of the display system.

CAIC evaluates images frame by frame and derives three unique digital gains, one for each of the R, G, and B color channels. During CAIC image processing, each gain is applied to all pixels in the associated color channel. CAIC derives each color channel’s gain that is applied to all pixels in that channel so that the pixels as a group collectively shift upward and as close to full scale as possible. To prevent any image quality degradation, the gains are set at the point where just a few pixels in each color channel are clipped. Figure 24 and Figure 25 show an example of the application of CAIC for one color channel.

DLPC3478 input_pixel_ex_LPS038.gifFigure 24. Input Pixels Example
DLPC3478 display_pix_CAIC_LPS038.gifFigure 25. Displayed Pixels After CAIC Processing

Figure 25 shows the gain that is applied to a color processing channel inside the device. CAIC also adjusts the power for the R, G, and B LED. For each color channel of an individual frame, CAIC determines the optimal combination of digital gain and LED power. The decision regarding how much digital gain to apply to a color channel and how much to adjust the LED power for that color is heavily influenced by the software command settings sent to the device for configuring CAIC.

As CAIC applies a digital gain to each color channel independently, and adjusts each LED’s power independently, CAIC also makes sure that the resulting color balance in the final image matches the target color balance for the projector system. Thus, the effective displayed white point of images is held constant by CAIC from frame to frame.

Because the R, G, and B channels can be gained up by CAIC inside the device, the LED power can be turned down for any color channel until the brightness of the color on the screen is unchanged. Thus, CAIC can achieve an overall LED power reduction while maintaining the same overall image brightness as if CAIC was not used. Figure 26 shows an example of LED power reduction by CAIC for an image where the R and B LEDs can be turned down in power.

CAIC can alternatively be used to increase the overall brightness of an image while holding the total power for all LEDs constant. In summary, when CAIC is enabled CAIC can operate in one of two distinct modes:

  • Power Reduction Mode – holds overall image brightness constant while reducing LED power
  • Enhanced Brightness Mode – holds overall LED power constant while enhancing image brightness
DLPC3478 CAIC_pwr_reduc_LPS038.gifFigure 26. CAIC Power Reduction Mode (for Constant Brightness)