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PD16635 Scheda tecnica(PDF) 8 Page - Renesas Technology Corp

Il numero della parte PD16635
Spiegazioni elettronici  240-OUTPUT TFT-LCD SOURCE DRIVER (COMPATIBLE WITH 64 GRAY SCALES)
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

PD16635 Scheda tecnica(HTML) 8 Page - Renesas Technology Corp

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µPD16635
6
5.
RELATIONSHIP BETWEEN INPUT DATA AND OUTPUT VOLTAGE VALUE
This product incorporates a 6-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 and switches. The ladder resistors r0 to r62
are so designed that the ratios between the LCD panel’s
γ -corrected voltages and V0’ to V63’ and V0” to V63” are
roughly equal; and their respective resistance values are as shown on page 9. Among the 5-by-2
γ -corrected
voltages, input gray scale voltages of the same polarity with respect to the common voltage, for the respective
five
γ -corrected voltages of V0 to V4 and V5 to V9. If fine gray scale voltage precision is not necessary, the voltage
follower circuit supplied to the
γ -corrected power supplies V1 to V3 and V6 to V8 can be deleted.
Figure 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 V9 and the input data. Be sure to maintain
the voltage relationships of VDD2 > V0 > V1 > V2 > V3 > V4 > V5 > V6 > V7 > V8 > V9 > VSS2. Figures 2-1 and 2-
2 show the relationship between the input data and the output data. Table 1 shows the resistance values of
the resistor strings.
This driver IC is designed for single-sided dot inversion mounting. Therefore, it cannot be used in double-
sided mounting.
Figure 1. Relationship Between Input Data and Output Voltage
VDD2
0.2 V
V1
V2
V3
V4
VCOM
V5
V6
V7
V8
0.2 V
VSS2
00
08
10
18
20
28
30
38
3F
Input data (HEX)
8
24
24
7
7
24
24
8
Split interval
V0
V9


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