UPD160040A 데이터 시트보기 (PDF) - NEC => Renesas Technology

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UPD160040A

384-OUTPUT TFT-LCD SOURCE DRIVER (COMPATIBLE WITH 256-GRAY SCALES)

NEC => Renesas Technology 

µPD160040A

5. RELATIONSHIP BETWEEN INPUT DATA AND OUTPUT VOLTAGE VALUE

The µPD160040A 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 voltage. The D/A

converter consists of ladder resistors and switches.

The ladder resistors (r0 to r253) are designed so that the ratio of LCD panel (γ -compensated voltages to V0’-V255’

and V0”-V255” is almost equivalent as shown in Figure 5−2. For the 2 sets of eight γ -compensated power supplies,

V0-V7 and V8-V15, respectively, input gray scale voltages of the same polarity with respect to the 0.5 VDD2.

Figure 5−1 shows the relationship between the driving voltages such as liquid-crystal driving voltages VDD2, VSS2 and

0.5 VDD2, and γ -corrected voltages V0-V15 and the input data. Be sure to maintain the voltage relationships below.

VDD2 –0.2 V ≥ V0 > V1 > V2 > V3 > V4 > V5 > V6 > V7 ≥ 0.5 VDD2 +0.5 V

0.5 VDD2 –0.5 V ≥ V8 > V9 > V10 > V11 > V12 > V13 > V14 > V15 ≥ 0.5 VSS2 +0.2 V

Also, V6-V7 and V8-V9 are left open in the IC. Be sure to input the gray scale level power supply at a constant level

to the all pins, as V0-V15.

Figures 5−2 shows γ-Corrected Voltages and Ladder Resistors Ratio and figure 5−3 shows the relation ship

between the input data and the output voltage (POL21, POL22 = L).

Figure 5−1. Relationship between Input Data and γ -corrected Power Supplies

0.2 V

VDD2

V0

V1

V2

V3

V4

V5

V6

V7

0.5 V

0.5 VDD2

0.5 V

V8

V9

V10

V11

V12

V13

V14

0.2 V

V15

V SS2

00 01

20

40

15

48

64

64

32

31

80

C0

Input data (HEX)

31

32

64

64

48

15

F0 FF

6

Data Sheet S15918EJ1V0DS

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