Nokia 5110 lcd, arduino uno R3 , v1.6.5

Using Arduino Displays
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  1. I am using nokia 5110 lcd, with arduino uno r3 & v1.6.5

  2. I have below libs & they worked both fine:
    Arduino Playground - PCD8544
    Downloads | Nokia 5110/3310 Monochrome LCD | Adafruit Learning System

  3. Currenly I am using first library.

  4. Now MCu works at 5V while lcd is at 3.3V. So I need a level translator.
    However instead of shifting level, I have connected 10K series resistor at reset, cs,dc din, & clk pins.
    is it ok to do so or I need to connect a level translator.

  5. Vdd lcd = 3.3V via arduino board.
    5K pot at BL pin of lcd, for adjustment.

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Vindchal_Takniki:
4. Now MCu works at 5V while lcd is at 3.3V. So I need a level translator.
However instead of shifting level, I have connected 10K series resistor at reset, cs,dc din, & clk pins.
is it ok to do so or I need to connect a level translator.

You don't need a level translator, you can run the LCD off the Arduino 3.3v pin. There is no need to do anything with resistors. I don't know what you mean by Vdd, but a pot is getting a bit precious with these displays. A 680r should suffice if you really need a light but you might not. If the display has a blue backlight, and you have some ambient light, you are likely to read it better with the backlight disconnected. Note that some 5110s activate the light by grounding the pin.

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thx