android - LibGdx Camera starts from mid screen -

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i using libgdx game development. new this. have setup camera 

public void create() {      camera = new orthographiccamera(game.screen_width, game.screen_height); }

i drawing background have shown below.

public void render(spritebatch sb) {      sb.draw(background, 0, 0,1080,1920);     sb.draw(background,0,1920,1080,1920);     sb.draw(background,0,3840,1080,1920);  }

with setup getting screen image starts width/2,height/2 instead of (0,0). please let me know code needs correction.


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