DIY Electronics / overo + 7inch TFT-LCD
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[[DIY Electronics]]
*Connecting Gumstix Overo with 7-inch LCD [#m7c5a68e]
**Introduction [#kd749797]
>
This article explains how to connect Gumstix Overo COM to...
>
>>
&ref(originalboard.jpg,,50%);~
>
Caution: Any Gumstix Overo COM cannot be directly connect...
**What is Gumstix Overo? [#c2498902]
>
Gumstix Overo COM is a single board computer (chip-on-mod...
>
>>
&ref(gumstix.jpg,,25%);~
** About TFT-LCD [#w40a3296]
>
For this article, Samsung's TFT-LCD LMS700KF23 is used. T...
- The screen size: 7 inch (diagonal)~
- The resolution of the screen: 800 x 400 pixels~
- The number of display colors: 16.3 million colors (24bi...
- The backlight employs 24 white LEDs. This TFT-LCD unit ...
>
- Datasheet of TFT-LCD
-- &ref(LMS700KF23.pdf);~
>
>>
&ref(DSCF7043.JPG,,25%);~
** Outlook (Known Issues) [#w09dd9c5]
>
OMAP, which is installed on Gumstix Overo COM, comes with...
>
There are critical issues to solve for attaching a TFT-LC...
**How TFT-LCD displays images on itself [#i978bf28]
>
Before it starts explaining how to attach a specific TFT-...
>
>>
&ref(LCD2.jpg);
>
OMAP sends a FCLK signal as the initiation signal for dra...
>
Next, OMAP sends a set of a PCLK signal and the amount of...
After the LCLK signal is received, the pixel drawing begi...
>
To draw images, the signals listed below are used. The li...
>
The list of signal:~
-Vertical Synchronization (VSYNC)
--It is also called Frame Clock (FCLK). This signal indic...
>
-Horizontal Syncronization (HSYNC)
--It is also defined as Line Clock (LCLK). This is a sign...
>
-Pixel Clock (PCLK)
--This signal indicates the completion of preparing one p...
>
-(Pixel) Data Enable (DE)
--This signal identify whether the RGB of pixel data is e...
>
-(Pixel) Data
--24bit length of data bus.
**About the voltage of IO driving signal [#o11b5406]
>
At the signal end, the voltage of peripherals of OMAP is ...
>
>>
&ref(LCD3.jpg);~
>
In general, the input voltage for H level needs to be 0.6...
>
H level input voltage = 3.3 x 0.65 = approximately 2.15...
The voltage from OMAP is 1.8V, and its H level voltage is...
As explained in the earlier paragraph, the signals, which...
>
>>
&ref(LCD4.jpg);~
>
To use a DIR terminal, this LSI can change the direction ...
>
In this example, the connection is established as it foll...
**Connecting with TFT-LCD (setting up the color signals) ...
>
The size of a pixel signal, which is sent from OMAP, is t...
>
At the connector of Gumstix Overo COM, its output signals...
>
At the input side of SN74AVCB164245, 1.8V input should no...
**TFT-LCD Backlight (setting up backlight) [#z960d7d7]
>
Each pixel of the TFT-LCD neither glow nor produce light ...
>
A few years ago, Cold Cathode Fluorescent Lamps were the ...
>
To adjust the level of luminance of the backlit display, ...
To change the level of luminance, this duty ratio is need...
>
The duty cycle ratio = the duration of Th / the duration...
>
>>
&ref(LCD5.jpg);~
>
To modify the level of luminance by the program, shifting...
**On Real Schematic [#i3ddfe42]
>
(1) Gumstix Overo connector~
>>
To connect with Gumstix Overo, the lines for the informat...
>
(2) Voltage Conversion~
>>
The signals that come out from OMAP are sent to VccA, and...
>
(3) Power Circuit~
>>
This circuit is required the specific levels of voltage f...
- 1.8 V
-- Used at I/O of OMAP
- 3.3 V
-- Used at TFT-LCD
- 3.3 ~ 4.2 V
-- Used at Overo COM
--- This does not mean that the level of voltage can be f...
>
(4) Backlight Circuit~
>>
TFT-LCD uses 24 white LEDs for backlight. The LEDs are di...
>>
LT3598 of Linear Technology Corp is used for managing boo...
**Others [#teb3e586]
>
The schematic, which is attached to this document, has li...
>
- Schematic~
-- &ref(OVERO-001-0001B.pdf);
* Revision History [#t5cf1603]
>
-- 2012/2/22 The article is initially uploaded.
-- 2012/2/24 The picture is added.
-- 2012/3/05 "Overo" is changed to "Overo COM".
End:
[[DIY Electronics]]
*Connecting Gumstix Overo with 7-inch LCD [#m7c5a68e]
**Introduction [#kd749797]
>
This article explains how to connect Gumstix Overo COM to...
>
>>
&ref(originalboard.jpg,,50%);~
>
Caution: Any Gumstix Overo COM cannot be directly connect...
**What is Gumstix Overo? [#c2498902]
>
Gumstix Overo COM is a single board computer (chip-on-mod...
>
>>
&ref(gumstix.jpg,,25%);~
** About TFT-LCD [#w40a3296]
>
For this article, Samsung's TFT-LCD LMS700KF23 is used. T...
- The screen size: 7 inch (diagonal)~
- The resolution of the screen: 800 x 400 pixels~
- The number of display colors: 16.3 million colors (24bi...
- The backlight employs 24 white LEDs. This TFT-LCD unit ...
>
- Datasheet of TFT-LCD
-- &ref(LMS700KF23.pdf);~
>
>>
&ref(DSCF7043.JPG,,25%);~
** Outlook (Known Issues) [#w09dd9c5]
>
OMAP, which is installed on Gumstix Overo COM, comes with...
>
There are critical issues to solve for attaching a TFT-LC...
**How TFT-LCD displays images on itself [#i978bf28]
>
Before it starts explaining how to attach a specific TFT-...
>
>>
&ref(LCD2.jpg);
>
OMAP sends a FCLK signal as the initiation signal for dra...
>
Next, OMAP sends a set of a PCLK signal and the amount of...
After the LCLK signal is received, the pixel drawing begi...
>
To draw images, the signals listed below are used. The li...
>
The list of signal:~
-Vertical Synchronization (VSYNC)
--It is also called Frame Clock (FCLK). This signal indic...
>
-Horizontal Syncronization (HSYNC)
--It is also defined as Line Clock (LCLK). This is a sign...
>
-Pixel Clock (PCLK)
--This signal indicates the completion of preparing one p...
>
-(Pixel) Data Enable (DE)
--This signal identify whether the RGB of pixel data is e...
>
-(Pixel) Data
--24bit length of data bus.
**About the voltage of IO driving signal [#o11b5406]
>
At the signal end, the voltage of peripherals of OMAP is ...
>
>>
&ref(LCD3.jpg);~
>
In general, the input voltage for H level needs to be 0.6...
>
H level input voltage = 3.3 x 0.65 = approximately 2.15...
The voltage from OMAP is 1.8V, and its H level voltage is...
As explained in the earlier paragraph, the signals, which...
>
>>
&ref(LCD4.jpg);~
>
To use a DIR terminal, this LSI can change the direction ...
>
In this example, the connection is established as it foll...
**Connecting with TFT-LCD (setting up the color signals) ...
>
The size of a pixel signal, which is sent from OMAP, is t...
>
At the connector of Gumstix Overo COM, its output signals...
>
At the input side of SN74AVCB164245, 1.8V input should no...
**TFT-LCD Backlight (setting up backlight) [#z960d7d7]
>
Each pixel of the TFT-LCD neither glow nor produce light ...
>
A few years ago, Cold Cathode Fluorescent Lamps were the ...
>
To adjust the level of luminance of the backlit display, ...
To change the level of luminance, this duty ratio is need...
>
The duty cycle ratio = the duration of Th / the duration...
>
>>
&ref(LCD5.jpg);~
>
To modify the level of luminance by the program, shifting...
**On Real Schematic [#i3ddfe42]
>
(1) Gumstix Overo connector~
>>
To connect with Gumstix Overo, the lines for the informat...
>
(2) Voltage Conversion~
>>
The signals that come out from OMAP are sent to VccA, and...
>
(3) Power Circuit~
>>
This circuit is required the specific levels of voltage f...
- 1.8 V
-- Used at I/O of OMAP
- 3.3 V
-- Used at TFT-LCD
- 3.3 ~ 4.2 V
-- Used at Overo COM
--- This does not mean that the level of voltage can be f...
>
(4) Backlight Circuit~
>>
TFT-LCD uses 24 white LEDs for backlight. The LEDs are di...
>>
LT3598 of Linear Technology Corp is used for managing boo...
**Others [#teb3e586]
>
The schematic, which is attached to this document, has li...
>
- Schematic~
-- &ref(OVERO-001-0001B.pdf);
* Revision History [#t5cf1603]
>
-- 2012/2/22 The article is initially uploaded.
-- 2012/2/24 The picture is added.
-- 2012/3/05 "Overo" is changed to "Overo COM".
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