# US 12,007,648 B2 · Backlight module, liquid crystal display screen, and using method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,007,648 B2 - Document ID: US12007648B2 - Status: Granted - Kind: B2 - Application number: 17/259,171 - Filed: 2020-11-24 - Published: 2022-12-15 - Granted: 2024-06-11 - Earliest claimed: 2020-09-29 - Applicants: Wuhan China Star Optoelectronics Technology Co., Ltd. - Inventors: Quan Tang; Jiang He; Guanghui Liu - Web page: https://patentgrep.com/patent/US12007648B2 ## CPC - G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side} - G02F 1/13338: {Input devices, e.g. touch panels} - G06V 40/1312: {direct reading, e.g. contactless acquisition} - G06V 40/1318: {using electro-optical elements or layers, e.g. electroluminescent sensing} - G02F 2201/44: Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers - G02F 2203/01: transmissive - G06V 10/145: Illumination specially adapted for pattern recognition, e.g. using gratings - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING ## Abstract In a backlight module, a liquid crystal display screen, and a using method thereof provided, the liquid crystal display screen includes a liquid crystal display panel, a backlight module switchable between a transparent state and a backlight state, and an optical component. Without disrupting full screen display and increasing a possibility of cellphone damages, the backlight module may solve a problem that the liquid crystal display screen is opaque to light, such that the screen is normally displayed, and the optical component is operated on the same liquid crystal display screen. ## Claims ### Claim 1 A backlight module, comprising a first backlight component and a second backlight component, wherein the first backlight component and the second backlight component are disposed opposite each other, the first backlight component includes a first side and a second side opposite each other, and the second backlight component is disposed on the first side or the second side; or wherein the first backlight component and the second backlight component are disposed in parallel, the first backlight component includes a first end and a second end opposite each other, and the second backlight component is disposed at the first end or the second end; wherein the first backlight component includes an adjustable transparent panel and a light emitting diode light strip disposed at one end of the adjustable transparent panel; when the light emitting diode light strip switches on and the adjustable transparent panel is in a backlight state, a path of light emitted by the light emitting diode light strip towards the adjustable transparent panel is changed to form a uniform plane light source; and when the light emitting diode light strip switches off and the adjustable transparent panel is in a transparent state, light from outside of the backlight module is transmitted through the adjustable transparent panel. ### Claim 2 (depends on 1) The backlight module as claimed in claim 1, wherein the adjustable transparent panel includes transparent base electrodes, indium tin oxide electrodes, and a light-scattering material layer; wherein the transparent base electrodes include a first transparent base electrode and a second transparent base electrode disposed opposite each other; wherein the indium tin oxide electrodes are disposed between the first transparent base electrode and the second transparent base electrode, the indium tin oxide electrodes include a first indium tin oxide electrode and a second indium tin oxide electrode, and the first transparent base electrode and the second transparent base electrode are disposed opposite each other; and wherein the light-scattering material layer is disposed between the first indium tin oxide electrode and the second indium tin oxide electrode. ### Claim 3 (depends on 2) The backlight module as claimed in claim 2, wherein when a first voltage is applied to the indium tin oxide electrodes, light-scattering material in the light-scattering material layer is excited, and scatters light emitted by the light emitting diode light strip towards the adjustable transparent panel, so as to change the path of the light emitted by the light emitting diode light strip towards the adjustable transparent panel, and form the uniform plane light source; and when a second voltage is applied to the indium tin oxide electrodes, the light-scattering material in the light-scattering material layer is not excited, the adjustable transparent panel is in the transparent state, and light from outside of the adjustable transparent panel is transmitted through the adjustable transparent panel. ### Claim 4 (depends on 2) The backlight module as claimed in claim 2, wherein the adjustable transparent panel further includes a plastic frame, the plastic frame is disposed at an end of the light-scattering material layer away from the light emitting diode light strip and at an end of the light-scattering material layer close to the light emitting diode light strip, and is disposed between the first indium tin oxide electrode and the second indium tin oxide electrode. ### Claim 5 (depends on 1) The backlight module as claimed in claim 1, wherein the second backlight component is disposed on the first side, a through hole is formed in a middle portion of the second backlight component, and the first backlight component covers the through hole. ### Claim 6 (depends on 1) The backlight module as claimed in claim 1, wherein the second backlight component is disposed on the second side, a through hole is formed in a middle portion of the second backlight component, and the first backlight component includes a first part and a second part disposed at both ends of the first part; wherein the first part is disposed opposite the through hole, the first part is in the transparent state or the backlight state, and the second part is in the transparent state. ### Claim 7 A liquid crystal display screen, comprising: a liquid crystal display panel including a first surface and a second surface opposite each other; and a backlight module disposed on the second surface of the liquid crystal display panel and including a first backlight component and a second backlight component, wherein the first backlight component and the second backlight component are disposed opposite each other, the second backlight component includes a first side and a second side opposite each other, and the first backlight component is disposed on the first side or the second side; or wherein the first backlight component and the second backlight component are disposed in parallel, the second backlight component includes a first end and a second end opposite each other, and the first backlight component is disposed at the first end or the second end, wherein the first backlight component includes an adjustable transparent panel and a light emitting diode light strip disposed at one end of the adjustable transparent panel; when the light emitting diode light strip switches on and the adjustable transparent panel is in a backlight state, a path of light emitted by the light emitting diode light strip towards the adjustable transparent panel is changed to form a uniform plane light source; and when the light emitting diode light strip switches off and the adjustable transparent panel is in a transparent state, light from outside of the backlight module is transmitted through the adjustable transparent panel. ### Claim 8 (depends on 7) The liquid crystal display screen as claimed in claim 7, wherein when the first backlight component is in the backlight state, a path of light emitted by the first backlight component is changed to form the uniform plane light source, so that the first backlight component provides backlight for the liquid crystal display panel as a backlight source; and when the first backlight component in the transparent state, light from inside and outside of the liquid crystal display screen is transmitted through the liquid crystal display panel and the backlight module. ### Claim 9 (depends on 7) The liquid crystal display screen as claimed in claim 7, wherein the adjustable transparent panel includes transparent base electrodes, indium tin oxide electrodes, and a light-scattering material layer; wherein the transparent base electrodes include a first transparent base electrode and a second transparent base electrode disposed opposite each other; wherein the indium tin oxide electrodes are disposed between the first transparent base electrode and the second transparent base electrode, the indium tin oxide electrodes include a first indium tin oxide electrode and a second indium tin oxide electrode, and the first transparent base electrode and the second transparent base electrode are disposed opposite each other; and wherein the light-scattering material layer is disposed between the first indium tin oxide electrode and the second indium tin oxide electrode. ### Claim 10 (depends on 9) The liquid crystal display screen as claimed in claim 9, wherein when a first voltage is applied to the indium tin oxide electrodes, light-scattering material in the light-scattering material layer is excited, and scatters light emitted by the light emitting diode light strip towards the adjustable transparent panel, so as to change the path of the light emitted by the light emitting diode light strip towards the adjustable transparent panel, and form the uniform plane light source; and when a second voltage is applied to the indium tin oxide electrodes, the light-scattering material in the light-scattering material layer is not excited, the adjustable transparent panel is in the transparent state, and light from outside of the adjustable transparent panel is transmitted through the adjustable transparent panel. ### Claim 11 (depends on 9) The liquid crystal display screen as claimed in claim 9, wherein the adjustable transparent panel further includes a plastic frame, the plastic frame is disposed at an end of the light-scattering material layer away from the light emitting diode light strip and at an end of the light-scattering material layer close to the light emitting diode light strip, and is disposed between the first indium tin oxide electrode and the second indium tin oxide electrode. ### Claim 12 (depends on 7) The liquid crystal display screen as claimed in claim 7, wherein the liquid crystal display screen further comprises an optical component disposed on a surface of the first backlight component, and the surface is away from the liquid crystal display panel. ### Claim 13 (depends on 12) The liquid crystal display screen as claimed in claim 12, wherein the optical component includes one or more of a camera, an optical fingerprint reader, a light sensor, and a distance sensor. ### Claim 14 (depends on 7) The backlight module as claimed in claim 7, wherein the second backlight component includes a shading layer and a backlight layer disposed on one side of the shading layer, and the shading layer is disposed on a side of the second backlight component away from the liquid crystal display panel. ### Claim 15 (depends on 7) The liquid crystal display screen as claimed in claim 7, wherein the second backlight component is disposed on the first side, a through hole is formed in a middle portion of the second backlight component, the first backlight component covers the through hole, and an optical component is disposed opposite the through hole. ### Claim 16 (depends on 7) The liquid crystal display screen as claimed in claim 7, wherein the second backlight component is disposed on the second side, a through hole is formed in a middle portion of the second backlight component, and an optical component is disposed inside the through hole; wherein the first backlight component includes a first part and a second part disposed at both ends of the first part; wherein the first part is disposed opposite the through hole, the first part is in a transparent state or a backlight state, and the second part is in the transparent state.