Method and device for adjusting display parameter, and display device

A displaying-parameter adjusting method, wherein the method comprises:

• detecting an ambient brightness;
• determining an adjustment parameter of a displaying device corresponding to a predetermined condition, wherein the predetermined condition comprises that a difference between a brightness of an intermediate grayscale of the displaying device and the ambient brightness is less than or equal to a preset brightness value;
• and
• adjusting a brightness of at least one of grayscales of the displaying device according to the adjustment parameter;
• wherein the step of, adjusting the brightness of the at least some of the grayscales of the displaying device according to the adjustment parameter comprises:
• acquiring a blue-light-radiation-exposure value of the displaying device, wherein the blue-light-radiation-exposure value is configured for characterizing a level of radiation injury on human eyes by blue light of the displaying device;
• and
• adjusting the brightness of the at least some of the grayscales of the displaying device according to the adjustment parameter and the blue-light-radiation-exposure value, to make the blue-light-radiation-exposure value is less than a preset standard value;
• wherein the step of acquiring the blue-light-radiation-exposure value of the displaying device comprises:
• calculating the blue-light-radiation-exposure value by using the following formula:
• LB=Σ300700 Lλ·B(λ)·Δλ,
• wherein LB is the blue-light-radiation-exposure value, λ is a wavelength of a scanning spectrum, a value of λ is greater than or equal to 300 nm, and less than or equal to 700 nm, Lλ is a radiation brightness of a light whose wavelength is λ, B(λ) is a preset coefficient of the light whose wavelength is λ, and Δλ is a scanning interval of spectrum scanning.