UM2104
User manual
4-inch WVGA TFT LCD board with MIPI® DSI interface and
capacitive touch screen
Introduction
The B-LCD40-DSI1 daughterboard provides 4-inch WVGA TFT LCD display with MIPI® DSI
interface. It features 480x800 pixels and 16.7M display colors. Self-capacitive touch panel is
also implemented on the B-LCD40-DSI1 daughterboard. It supports single-point touch and
gesture, or two-point touch.
The B-LCD40-DSI1 daughterboard is used on STM32 evaluation boards or on discovery
boards to demonstrate display solutions of the STM32 MCUs.
Figure 1. B-LCD40-DSI1 daughterboard
1. Picture is not contractual
September 2016
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1
Contents
UM2104
Contents
1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3
Hardware layout and configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Video and touch panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1
Motherboard connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2
LCD display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.3
Backlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.4
Touch panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Appendix A Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
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List of tables
List of tables
Table 1.
Table 2.
Table 3.
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Motherboard connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
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List of figures
UM2104
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
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B-LCD40-DSI1 daughterboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
B-LCD40-DSI1 daughterboard hardware block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
B-LCD40-DSI1 daughterboard layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
B-LCD40-DSI1 daughterboard schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
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UM2104
1
2
Features
Features
•
4-inch TFT color LCD
•
480(RGB)x800 pixels
•
16.7M display colors
•
RGB vertical stripe of pixel arrangement
•
Up to two lanes of MIPI/DSI data
•
Self-capacitive touch panel supports single-point touch and gesture, or two-point touch
•
2.8V-3.3V power supply for both LCD and touch panel, 5V power supply for backlight
Order code
To order the DSI LCD daughterboard, refer to Table 1:
Table 1. Ordering information
3
Order code
Product
B-LCD40-DSI1
DSI LCD daughterboard
Hardware layout and configuration
B-LCD40-DSI1 daughterboard is designed around MIPI TFT LCD. The hardware block
diagram (see Figure 2) shows the connections between the B-LCD40-DSI1 daughterboard
and the motherboard. Refer to the layout of the B-LCD40-DSI1 daughterboard (see Figure
3) to locate these connections on the evaluation board.
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Hardware layout and configuration
UM2104
Figure 2. B-LCD40-DSI1 daughterboard hardware block diagram
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Figure 3. B-LCD40-DSI1 daughterboard layout
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Video and touch panel
4
Video and touch panel
4.1
Motherboard connector
A male high-speed connector CN1 on bottom side is used to implement the B-LCD40-DSI1
daughterboard on the motherboard. 2-lane DSI video signal and control signals (I2C bus,
reset and interrupt signals) are on this connector.
Table 2 shows the pinout of CN1.
Table 2. Motherboard connector
Pin No.
Description
Interface
1
GND
-
3
DSI_CK_P
5
Pin No.
Description
Interface
2
-
-
DSI
4
TOUCH_INT
Interrupt output
DSI_CK_N
DSI
6
-
-
7
GND
-
8
-
-
9
DSI_D0_P
DSI
10
-
-
11
DSI_D0_N
DSI
12
-
-
13
GND
-
14
-
-
15
DSI_D1_P
DSI
16
-
-
17
DSI_D1_N
DSI
18
-
-
19
GND
-
20
-
-
21
BLVDD(+5V)
-
22
-
-
23
BLVDD(+5V)
-
24
-
-
25
-
-
26
-
-
27
BLGND
-
28
-
-
29
BLGND
-
30
-
-
31
-
-
32
-
-
33
-
-
34
-
-
35
-
-
36
VDD(2.8V-3.3V)
-
37
-
-
38
-
2C
odd
even
39
-
-
40
I2C_SDA
I
41
-
-
42
-
2
43
-
-
44
I2C1_SCL
I C
45
-
-
46
-
-
47
-
-
48
-
-
49
DSI_TE
DSI
50
-
-
51
-
-
52
-
-
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Video and touch panel
UM2104
Table 2. Motherboard connector (continued)
Pin No.
Description
Interface
53
BL_CTRL
GPIO
55
-
57
59
odd
4.2
Pin No.
Description
Interface
54
-
-
-
56
-
-
RESET
GPIO
58
-
-
-
-
60
-
-
even
LCD display
LCD display on B-LCD40-DSI1 daughterboard is a color active matrix TFT (Thin Film
Transistor) LCD (Liquid Crystal Display) that uses amorphous silicon TFT as a switching
device. The resolution of a 4-inch TFT-LCD contains 480x800 pixels, and displays up to
16.7M colors. The interface between LCD and microcontroller is a 2-Lane MIPI signal.
The LCD module is reset by RESET signal on CN1 Pin57.
4.3
Backlight
Backlight unit of LCD requires typical 25.6V power supply. It is provided by boost converter
STLD40DPUR on B-LCD40-DSI1 daughterboard.
4.4
Touch panel
The self-capacitive touch panel on LCD module supports single-point and gesture touch, or
two-points touch. The interface is I2C whose address is 0x1010100. The touch panel
outputs interrupt signals on CN1 Pin4.
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Schematics
UM2104
Appendix A
Figure 4. B-LCD40-DSI1 daughterboard schematics
LCD P/N:
TP1
GND
TP2
BLGND
CN1
TP3
CN2
TP5
4.7uH(1A)
Z1
C1
4.7uF/50V
VH
L2
DocID029648 Rev 1
STPS1L40M
C5
4.7uF/10V
CABC
8
1
7
3
9
R1
0
R4
SW
Vo
Vi
NC
EN
GND
FB
PGND Rset
6
5
HSSI_D1_N
HSSI_D1_P
16
18
TE
22
RST
5
CABC
3
A
K
24
23
1
9
13
17
20
BLGND
4
2
VDD
STLD40DPUR
R2
100K
BLGND
[N/A]
VDD
8
10
C2
10nF
U1
BLGND
BL_CTRL
HSSI_D0_N
HSSI_D0_P
VL
VL
C4
10nF
12
14
VH
L1
BEAD
C3
100nF
HSSI_CLK_N
HSSI_CLK_P
VDD
TP4
BLVDD
KJD KM-040TMP-02
Frida FRD397B2509
R3
10
C6
C7
100nF 4.7uF
BLGND
R5
4K7
21
6
2
4
7
11
15
19
25
HSSI_CLK_N
HSSI_CLK_P
HSSI_D0_N
HSSI_D0_P
HSSI_D1_N
HSSI_D1_P
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
HSSI_CLK_P
HSSI_CLK_N
HSSI_D0_P
HSSI_D0_N
HSSI_D1_P
HSSI_D1_N
TE
BLVDD
RESX
CABC
BLGND
LEDA
LEDK
ID
NC
NC
NC
NC/ERR
VCC
IOVCC
GND
GND
GND
GND
GND
GND
GND
FH26-25S-0.3SHW
FPC03025-14201(ATOM)
TE
BL_CTRL
RST
61
62
63
64
SB2
Open
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
61
62
63
64
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
INT
SB1
Open
BLVDD
VDD
I2C_SDA
I2C_SCL
C8
100nF
QTH-030-02-F-D-A
BLGND
Backlight driver & PFC connector for LCD panel
Connector for motherboard
VDD
R6 R7
[N/A][N/A]
R8
4K7
H1
H3
H2
H4
CN3
3
4
I2C_SCL
I2C_SDA
INT
RST
2
5
VDD
C9
100nF
1
6
SCL
SDA
INT
RESET
I2C Address:1010100
VDD
GND
FH19C-6S-05SH
FPC05006-09200(ATOM)
Touch panel connector for LCD panel
Note: Text in italic placed on a wire doesn¡¯t correspond to net name. It just helps to
identify rapidly MCU IO related to this wire.
Title: 4 inch DSI LCD board
Project: LCD daugterboard
Reference: MB1166
Date: 8/15/2016
Revision: A.1
Sheet: 1 of 1
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Schematics
Size: A4
Revision history
UM2104
Revision history
Table 3. Document revision history
10/11
Date
Revision
28-Sep-2016
1
Revision Details
Initial version.
DocID029648 Rev 1
UM2104
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