A terminal device, comprising a display module, an optical fingerprint sensor, at least two backlight assemblies (300, 500), and a light emitter, wherein the display module comprises a display screen and a light-transmissive cover that covers the display screen; the light emitter and the display screen are both fastened onto an inner surface of the light-transmissive cover, the optical fingerprint sensor is provided on a side of the display screen facing away from the light-transmissive cover, and the at least two backlight assemblies (300, 500) are provided sequentially between the display screen and the optical fingerprint sensor; the at least two backlight assemblies (300, 500) are configured to provide backlight; two neighboring backlight assemblies among the at least two backlight assemblies (300, 500) are in direct contact with each other; along a direction from the display screen to the optical fingerprint sensor, areas of light-transmissive regions of the at least two backlight assemblies (300, 500) are gradually reduced, so that, for two adjacent backlight assemblies (300, 500), the area of the light-transmissive region of the backlight assembly closer to the display screen is larger; and light emitted by the light emitter experiences a finger, and then successively passes through the display module and the light-transmissive regions and is projected onto the optical fingerprint sensor, wherein each backlight assembly (300; 500) comprises a light-shielding ring (320; 520), a first light-enhancing film (330; 530), a second light-enhancing film (340; 540), a diffusion film (350; 550), a light guide plate (360; 560), and a reflective film (370; 570) that are sequentially arranged in a direction away from the display screen; a region of the diffusion film (350;550) corresponding to the light-transmissive region of the respective backlight assembly (300; 500) is provided with a first avoidance hole (351; 551), and a region of the reflective film (370; 570) corresponding to the light-transmissive region of the respective backlight assembly (300; 500) is provided with a second avoidance hole (371; 571); and for regions of the first light-enhancing film (330; 530), the second light-enhancing film (340; 540), and the light guide plate (360; 560) corresponding to the light-transmissive region of the respective backlight assembly (300; 500), outer surfaces of the regions facing towards the display screen are all flat surfaces, and characterized in that, for said regions, the first light-enhancing film (330; 530) and the second light-enhancing film (340; 540) both comprise a film body (a) and an adhesive layer (b), a surface of the film body (a) facing towards the display screen is a prism structure surface (c), and the adhesive layer (b) is applied on the prism structure surface (c) to form the outer surface, and in that, for said regions, the refractive index of the adhesive layer (b) is equal to the refractive index of the film body (a). the at least two backlight assemblies (300, 500) are configured to provide backlight; two neighboring backlight assemblies among the at least two backlight assemblies (300, 500) are in direct contact with each other; along a direction from the display screen to the optical fingerprint sensor, areas of light-transmissive regions of the at least two backlight assemblies (300, 500) are gradually reduced, so that, for two adjacent backlight assemblies (300, 500), the area of the light-transmissive region of the backlight assembly closer to the display screen is larger; and light emitted by the light emitter experiences a finger, and then successively passes through the display module and the light-transmissive regions and is projected onto the optical fingerprint sensor, wherein each backlight assembly (300; 500) comprises a light-shielding ring (320; 520), a first light-enhancing film (330; 530), a second light-enhancing film (340; 540), a diffusion film (350; 550), a light guide plate (360; 560), and a reflective film (370; 570) that are sequentially arranged in a direction away from the display screen; a region of the diffusion film (350;550) corresponding to the light-transmissive region of the respective backlight assembly (300; 500) is provided with a first avoidance hole (351; 551), and a region of the reflective film (370; 570) corresponding to the light-transmissive region of the respective backlight assembly (300; 500) is provided with a second avoidance hole (371; 571); and for regions of the first light-enhancing film (330; 530), the second light-enhancing film (340; 540), and the light guide plate (360; 560) corresponding to the light-transmissive region of the respective backlight assembly (300; 500), outer surfaces of the regions facing towards the display screen are all flat surfaces, and characterized in that, for said regions, the first light-enhancing film (330; 530) and the second light-enhancing film (340; 540) both comprise a film body (a) and an adhesive layer (b), a surface of the film body (a) facing towards the display screen is a prism structure surface (c), and the adhesive layer (b) is applied on the prism structure surface (c) to form the outer surface, and in that, for said regions, the refractive index of the adhesive layer (b) is equal to the refractive index of the film body (a).