Use of a light-reflecting strip for providing a liquid crystal display device, said light-reflecting strip comprising: a light-reflecting substrate having a configuration surface and a smooth surface opposite to the configuration surface; a light-reflecting base layer coated on the configuration surface; wherein the light-reflecting base layer comprises silicon and is formed on the configuration surface by means of vapor transfer printing or coating; a reflecting layer deposited on the light-reflecting base layer; a high transmittance colorant layer printed on the reflecting layer by means of a screen printing with a screen having a mesh number greater than 300; an adhesive layer applied on the smooth surface of the light-reflecting substrate; and said light-reflecting strip being provided with a release paper detachably adhered to the adhesive layer; said liquid crystal display device comprising: a liquid crystal display panel; and a back-light module disposed at a back side of the liquid crystal display panel and having an active light source provided at one side of the back-light module, wherein the light-reflecting strip is attached to the other three sides of the back-light module to reflect light incident on the light-reflecting strip for illuminating the liquid crystal display panel, and wherein the attachment of the light-reflecting strip to the back-light module is done after detachment of the release paper from the adhesive layer. a light-reflecting substrate having a configuration surface and a smooth surface opposite to the configuration surface; a light-reflecting base layer coated on the configuration surface; wherein the light-reflecting base layer comprises silicon and is formed on the configuration surface by means of vapor transfer printing or coating; a reflecting layer deposited on the light-reflecting base layer; a high transmittance colorant layer printed on the reflecting layer by means of a screen printing with a screen having a mesh number greater than 300; an adhesive layer applied on the smooth surface of the light-reflecting substrate; and said light-reflecting strip being provided with a release paper detachably adhered to the adhesive layer; said liquid crystal display device comprising: a liquid crystal display panel; and a back-light module disposed at a back side of the liquid crystal display panel and having an active light source provided at one side of the back-light module, wherein the light-reflecting strip is attached to the other three sides of the back-light module to reflect light incident on the light-reflecting strip for illuminating the liquid crystal display panel, and wherein the attachment of the light-reflecting strip to the back-light module is done after detachment of the release paper from the adhesive layer. a liquid crystal display panel; and a back-light module disposed at a back side of the liquid crystal display panel and having an active light source provided at one side of the back-light module, wherein the light-reflecting strip is attached to the other three sides of the back-light module to reflect light incident on the light-reflecting strip for illuminating the liquid crystal display panel, and wherein the attachment of the light-reflecting strip to the back-light module is done after detachment of the release paper from the adhesive layer.