Images not scaling properly in LibGDX when using “batch.setProjectionMatrix(camera.combined);”

I am trying to put Assets into my game but when i put in the line of code “batch.setProjectionMatrix(camera.combined);”, which from my knowledge scales the Asset to the size of the window it appears massive.

Here is my code:

MyGame.java:

    package com.mygdx.mygame;

import com.badlogic.gdx.Game;

public class MyGame extends Game
{
    public  GameScreen  game_screen;

    @Override
    public void create() 
    {
        game_screen = new GameScreen(this);
        setScreen(game_screen);

        Assets.load();
    }
}

GameScreen.java:

package com.mygdx.mygame;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;

public class GameScreen implements Screen
{
    MyGame mygame;
    OrthographicCamera camera;
    SpriteBatch batch;

    public GameScreen(MyGame myGame) 
    {
        camera = new OrthographicCamera();
        camera.setToOrtho(true,1920,1080);

        batch = new SpriteBatch();
    }

    @Override
    public void show() {

    }

    @Override
    public void render(float delta) 
    {
        Gdx.gl30.glClearColor(1F, 1F, 1F, 1F);
        Gdx.gl30.glClear(GL20.GL_COLOR_BUFFER_BIT);

        camera.update();

        batch.begin();
        batch.draw(Assets.sprite_back, 0, 0);
        batch.end();
        batch.setProjectionMatrix(camera.combined);
    }

    @Override
    public void pause() {

    }

    @Override
    public void resume() {

    }

    @Override
    public void hide() {

    }

    @Override
    public void dispose() {

    }

    @Override
    public void resize(int width, int height) {

    }

}

Assets.java:

package com.mygdx.mygame;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.Texture.TextureFilter;
import com.badlogic.gdx.graphics.g2d.Sprite;

public class Assets 
{

    public static Texture texture_back;
    public static Sprite sprite_back;

    public static void load()
    {

        texture_back = new Texture(Gdx.files.internal("Play.jpg"));
        texture_back.setFilter(TextureFilter.Linear,  TextureFilter.Linear);
        sprite_back = new Sprite(texture_back);
        sprite_back.flip(false, true);
    }
}

DesktopLauncher.java:

    package com.mygdx.mygame;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.Texture.TextureFilter;
import com.badlogic.gdx.graphics.g2d.Sprite;

public class Assets 
{

    public static Texture texture_back;
    public static Sprite sprite_back;

    public static void load()
    {

        texture_back = new Texture(Gdx.files.internal("Play.jpg"));
        texture_back.setFilter(TextureFilter.Linear,  TextureFilter.Linear);
        sprite_back = new Sprite(texture_back);
        sprite_back.flip(false, true);
    }
}

Please Help!