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| 型号： | BUF20820EVM |
| 厂商： | Texas Instruments |
| 文件页数： | 8/29页 |
| 文件大小： | 0K |
| 描述： | EVAL MOUDLE FOR BUF20820 |
| 标准包装： | 1 |
| 系列： | * |
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BUF20820
SBOS330E DECEMBER 2005 REVISED OCTOBER 2008
www.ti.com
16
REPLACEMENT OF TRADITIONAL GAMMA
BUFFER
Traditional gamma buffers rely on a resistor string (often
using expensive 0.1% resistors) to set the gamma
voltages. During development, the optimization of these
gamma voltages can be time consuming. Programming
these
gamma
voltages
with
the
BUF20820
can
significantly reduce the time required for gamma voltage
optimization. The final gamma values can be written into
the internal OTP memory to replace a traditional gamma
buffer solution. Figure 13a shows the traditional resistor
string approach; Figure 13b shows the more efficient
alternative method using the BUF20820.
The BUF20820 uses the most advanced high-voltage
CMOS process available today, which allows it to be
competitive with traditional gamma buffers.
Programmability offers the following advantages:
D It shortens development time significantly.
D It eliminates manufacturing variance between panels.
D It allows a single panel to be built for multiple
customers, with loading of customer-dependent
gamma
curves
during
final
production.
This
significantly lowers inventory cost and risk and
simplifies inventory management.
D It allows demonstration of various gamma curves to
LCD monitor makers by simply uploading a different
set of gamma values.
D It provides a simple means of adjusting gamma curves
during final production improve picture quality and
accommodate changes in the panel manufacturing
process or end-customer requirements.
D It decreases cost and space.
BUFxx704
a) Traditional
b) BUF20820 Solution
PC
SDA
SCL
SDA
SCL
Timing
Controller
LCD Panel Electronics
BUF20820
R
egi
s
te
r
Control Interface
Gamma
References
OUT1
OUT2
OUT17
OUT18
V
COM
V
COM OUT1
V
COM OUT2
Figure 13. Replacement of the Traditional Gamma Buffer
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