Display screen lifter springs can be equipped on computers and medical appliances to lift them since this kind spring provides constant tension force. The constant tension springs can be made from stainless steel SUS301, BTX carbon steel and other materials are available upon request. The fatigue life of display screen lifter springs is over 13000 times and the springs have thickness of 0.1-0.25mm, width of 10-15mm, length of 300-800mm and the sizes can be changed to match with multiple fields.