PD16754_15 Datasheet, PDF (8/21 Pages) Renesas Technology Corp – 384-OUTPUT TFT-LCD SOURCE DRIVER (COMPATIBLE WITH 256-GRAY SCALES)

µPD16754
5. RELATIONSHIP BETWEEN INPUT DATA AND OUTPUT VOLTAGE VALUE
This product incorporates a 8-bit D/A converter whose odd output pins and even output pins output respectively
gray scale voltages of differing polarity with respect to the LCD’s counter electrode (common electrode) voltage. The
D/A converter consists of ladder resistors.
Figure 5−1 shows the relationship between the driving voltages such as liquid-crystal driving voltages VDD2 and
VSS2, common electrode potential VCOM, and γ -corrected voltages V0 to V15 and the input data.
Be sure to maintain the voltage relationships as follows:
VDD2 − 0.2 V ≥ V0 > V1 > V2 > V3 > V4 > V5 > V6 > V7 ≥ 0.5 VDD2
0.5 VDD2 − 0.3 ≥ V8 > V9 > V10 > V11 > V12 > V13 > V14 > V15 ≥ VSS2 + 0.2 V.
Figures 5−2 shows γ -corrected power supply voltage and ladder resistors ratio and Figures 5−3 shows the
relationship between the input data and the output voltage and the resistance values of the resistor strings.
5
Figure 5−1. Relationship between Input Data and γ - corrected Power Supplies
0.2 V
VDD2
V0
V1
V2
V3
V4
V5
V6
V7
0.3 V
0.5 VDD2
V8
V9
V10
V11
V12
V13
V14
V15
0.2 V
VSS2
00
20
40
80
Input data (HEX.)
32
32
64
64
32
32
Split interval
32
32
64
64
32
32
C0
E0
FEFF
6
Data Sheet S16434EJ1V0DS