upd161608 Renesas Electronics Corporation., upd161608 Datasheet - Page 52

• Manufacturer Part Number: upd161608
• Description: 176-rgb X 220-dot 1-chip Driver Ic For 262,144-color Tft-lcd Display
• Manufacturer: Renesas Electronics Corporation.

16. GAMMA ADJUSTMENT REGISTER
This register can set positive/negative polarities independently. There are 3 types of register groups to adjust gray-scale
and oscillation on number of the gray-scale, characteristics of the gray-scale voltage (But, R.G.B. is commonness).
Following graphics indicate the operation of each adjusting register.
16.1 Gray-scale Adjustment Resistor
the voltage without changing the dynamic range. To accomplish the adjustment, it controls the variable resistor (VRHP
(N)/VRLP (N)) of the ladder resistor for the gray-scale voltage generator. Also, there is an independent resistor on the
positive/negative polarities in order for corresponding to asymmetry drive.
16.2 Reference Adjustment Resistor
controls the variable resistor (VRP(N) 0) of the ladder resistor for the gray-scale voltage generator located at upper side of
the ladder resistor.
16.3 Amplitude Adjustment Resistor
controls the variable resistor (VRP(N) 1) of the ladder resistor for the gray-scale voltage generator located at lower side of
the ladder resistor (Adjust upper side by input VLCD63 level). Also, there is an independent resistor on the
positive/negative polarities as well as the gray-scale adjusting resistor.
16.4 Micro Adjustment Resistor
adjustment, it controls the each reference voltage level by the 8 to 1 selector towards the 8-leveled reference voltage
generated from the ladder resistor. Also, there is an independent resistor on the positive/negative polarities as well as
other adjusting resistors.
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The gamma adjustment register sets up the gray-scale voltage adjusting to the gamma specification of the LCD panel.
The gray-scale adjustment resistors are used to adjust the gray-scale in the middle of the gray-scale characteristics for
The Reference-adjusting resistor is to adjust reference of the gray-scale voltage. To accomplish the adjustment, it
The amplitude-adjusting resistor is to adjust amplitude of the gray-scale voltage. To accomplish the adjustment, it
The micro adjustment resistor is to make subtle adjustment of the gray-scale voltage level. To accomplish the
(1) Gray-scale adjustment
Gray-scale number
Figure 16−1. The Operation of Adjusting Register
(2) Reference adjustment
Gray-scale number
Data Sheet S17594EJ2V0DS
(3) Amplitude adjustment
Gray-scale number
(4) Micro adjustment
Gray-scale number
μ
PD161608