Samsung Exynos 5 User Manual

Samsung Confidential  
Exynos 5250_UM 15 Display Controller 
 15-29  
15.3.6.2 Blending Diagram 
The display controller can blend five layers for a pixel simultaneously. ALPHA0_R, ALPHA0_G, ALPHA0_B, 
ALPHA1_R, ALPHA1_G, and ALPHA1_B registers control the alpha value (blending factor). These alpha values 
are implemented for each window layer and color (R, G, B). 
This example describes the R (Red) output using ALPHA_R value of each window:  
All windows contain two types of alpha blending value: 
...

Samsung Confidential  
Exynos 5250_UM 15 Display Controller 
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Figure 15-7 illustrates the blending factor decision. 
 
    Figure 15-7   Blending Factor Decision 
NOTE: When DATA[15:12] (BPPMODE_F = 1110, ARGB4444 format) is used to blend, the alpha value is {DATA[15:12], 
DATA[15:12]} (4-bit  8-bit expanding).  
  AR decisionARn
ALPHA0_R
ALPHA1_R
DATA
Palette
Keying
AEN
BLD_PIX
ALPHA_SEL
ALPHA_MUL   

Samsung Confidential  
Exynos 5250_UM 15 Display Controller 
 15-31  
15.3.6.3 3D Stereoscopic Function 
Figure 15-8 illustrates the blending factor decision. 
 
    Figure 15-8   Blending Factor Decision 
 
 WIN0 (RGB)WIN1 (RGB)WIN2 (RGB)WIN3 (RGB)WIN4 (RGB)
BlendingColor Keying
BlendingColor Keying
BlendingColor Keying
BlendingColor Keying
Color Gain (RGB)
RGBe
RGB888RGB888RGB888RGB888RGB888
RGB888
RGB888
RGB888
RGB888
RGBb
RGB888
LR_MERGER
RGB888RGB888
LR_MERGER
RGB888RGB888  

Samsung Confidential  
Exynos 5250_UM 15 Display Controller 
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The LR_MERGER block supports the 3D stereoscopic display. This block is located before the blending logic. The 
LR_MERGER creates a new frame by merging two left and right frames for 3D stereoscopic display device.  
When MERGE_EN is set to 1 and L_FIRST is set to 1, it generates two outputs: 
 A merged data stream output, which begins with L frame data 
 An output that begins with R frame data 
Figure 15-9 and Figure 15-10...

Samsung Confidential  
Exynos 5250_UM 15 Display Controller 
 15-33  
When INTERPOL_EN bit is set to 1, the output data is the interpolated data with data of two pixels. 
 
    Figure 15-10   Timing Diagram for LR_MERGER Block 
 
  

Samsung Confidential  
Exynos 5250_UM 15 Display Controller 
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When LINE_SWAP bit is set to 1, the order of the output data in even line and odd line are reverse.  
Figure 15-11 illustrates the output frame for LR_MERGER block. 
 
    Figure 15-11   Output Frame for LR_MERGER Block 
 
 
  

Samsung Confidential  
Exynos 5250_UM 15 Display Controller 
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15.3.6.4 Color Key Function 
The Color Key function in display controller supports various effects for image mapping. For special functionality, 
the background image substitutes the Color Key register that specifies the color image of OSD layer. It substitutes 
the Color Key register, either as a cursor image of the camera, or as a preview image of the camera. 
Figure 15-12 illustrates the configuration of Color Key function....

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Exynos 5250_UM 15 Display Controller 
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15.3.6.5 Blending and Color-Key Function 
The display controller supports simultaneous blending function. It supports two transparency factors and Color 
Key function in the same window.  
Figure 15-13 illustrates the Blending and Color Key function. 
 
    Figure 15-13   Blending and Color-Key Function 
 
 Window 1Window 0
Sub - menu
Chroma-key
Alpha 0 (50%)
Alpha 1 (100%)
Sub - menu
Sub - menu
Main Menu
Camera
Mail
Memo
08:23
Main...

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Exynos 5250_UM 15 Display Controller 
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Figure 15-14 illustrates the blending decision diagram. 
 
    Figure 15-14   Blending Decision Diagram 
 
 KEY_EN ?
Start
a = 1 (max)b = 0
N
Color matchYN
< Blending Equation Decision >
KEY_BLEN ?
a = alphaAb = 1 -alphaA
YN
Y
DIRCONYNY
a = 0 b = 1 (max)
a = A_FUNCb = B_FUNC
End
Blending & Chroma-keyingalphaAalphaBAB
alphaB’B’
Equation Decision
TransparencyFactor Decision
DataFormatter
TransparencyFactor Decision
DataFormatter
KEY_EN...

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Exynos 5250_UM 15 Display Controller 
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15.3.7 Image Enhancement 
15.3.7.1 Overview  
The main function of the VPRCS module is image enhancement. The display controller supports these functions:  
 Color Gain 
Figure 15-15 illustrates the image enhancement flow. 
 
    Figure 15-15   Image Enhancement Flow 
 
15.3.7.2 Color Gain Control 
Color Gain Control consists of three registers for each color: Red, Green, and Blue. The maximum value of color 
gain is 3.99609375...