參數(shù)資料
型號： UPD16640CN
廠商： NEC Corp.
英文描述： 300/309-OUTPUT TFT-LCD SOURCE DRIVER 64 GRAY SCALE
中文描述： 300/309-OUTPUT TFT - LCD的源驅(qū)動64灰階
文件頁數(shù)： 7/16頁
文件大?。?/td> 105K
代理商： UPD16640CN
Data Sheet S11269EJ1V1DS00
7
μ
PD16640C
4.1
γ
-corrected Power Circuit
The reference power supply of the D/A converter consists of a ladder circuit with a total of 64 resistors, and
resistance
Σ
ri between
γ
-corrected power pins differs depending on each pair of
γ
-corrected power pins. One pair of
γ
-corrected power pins consists of seven or eight series resistors, and resistance
Σ
ri in the figure below is indicated
as the sum of the seven or eight resistors. The resistance ratio between the
γ
-corrected power pins (
Σ
ri ratio) is
designed to be a value relatively close to the ratio of the
γ
-corrected voltages V
1
to V
9
(gray-scale voltages in 8 steps)
used in an actual LCD panel. Under ideal conditions where there is no difference between the two, therefore, there is
no voltage difference between the voltage of the
γ
-corrected power supplies and the gray-scale voltages in 8 steps of
the resistor ladder circuits of the
μ
PD16640C, and no current flows into the
γ
-corrected power pins V
1
to V
9
. As a
result, a voltage-follower circuit is not necessary.
Figure 4-2.
γ
-corrected Power Circuit
V
0
V
1
V
2
V
3
V
4
V
5
V
6
V
7
V
8
V
9
V
10
i
0
R
0
= 2.39 k
PD16640C
μ
R
1
=
Σ
r
i
= 4.45 k
i = 1
i
1
i
2
i
3
i
4
i
5
i
6
i
7
i
8
i
9
i
10
7
R
2
=
Σ
r
i
= 6.19 k
i = 1
8
R
3
=
Σ
r
i
= 3.58 k
i = 1
8
R
4
=
Σ
r
i
= 2.15 k
i = 1
8
R
5
=
Σ
r
i
= 2.03 k
i = 1
8
R
6
=
Σ
r
i
= 1.61 k
i = 1
8
R
7
=
Σ
r
i
= 2.03 k
i = 1
8
R
8
=
Σ
r
i
= 3.39 k
i = 1
7
R
9
= 2.55 k
γ
-corrected power pin
γ
-corrected resistor
Sum of eight
γ
-corrected resistors
+
+
+
+
+
+
+
+
+
+
+
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UPD16640CN-XXX 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver
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UPD166413T1F-E1 制造商:NEC Electronics Corporation 功能描述:
UPD166413T1FSSA 制造商:NEC Electronics Corporation 功能描述:
UPD16641N 制造商:NEC 制造商全稱:NEC 功能描述:SOURCE DRIVER FOR 240-OUTPUT TFT-LCD 64 GRAY SCALES
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