# US 10,120,217 B2 · Method for measuring the liquid crystal efficiency of the liquid crystal layer to the incident light > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,120,217 B2 - Document ID: US10120217B2 - Status: Granted - Kind: B2 - Application number: 15/102,734 - Filed: 2016-05-19 - Published: 2018-03-22 - Granted: 2018-11-06 - Earliest claimed: 2016-04-18 - Assignees: Shenzhen China Star Optoelectronics Technology Co., Ltd. - Applicants: Shenzhen China Star Optoelectronics Technology Co., Ltd. - Inventors: Bo Hai - Web page: https://patentgrep.com/patent/US10120217B2 ## CPC - G02F 1/1309: {Repairing; Testing} - G01M 11/00: Testing of optical apparatus; Testing structures by optical methods not otherwise provided for - G01M 11/0285: {by measuring material or chromatic transmission properties (G01M11/0292 takes precedence)} - G01N 21/21: Polarisation-affecting properties (G01N21/19 takes precedence) - G01N 21/25: Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands - G01N 21/59: Transmissivity (G01N21/25 takes precedence) - G09G 3/006: {Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309)} - 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 - G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## Abstract The present disclosure providing a method for measuring the liquid crystal efficiency of the liquid crystal layer to the incident light, the method includes: keeping the lower polarizing plate unchanged to make the upper polarizing plate and the lower polarizing of the liquid crystal layer in a first state; in the first state, controlling the brightness of the screen of the liquid crystal panel to be 0 gray and to be 255 to measure the brightness Lvx and Lvy of the target position of the liquid crystal panel, respectively; according to the brightness Lvx and the brightness Lvy, determining the liquid crystal efficiency of the liquid crystal layer to the incident light. By the above method, the present disclosure could be performed without disassembling the module, number of the measurements is few and simple, and the efficiency and the accuracy are high. ## Claims ### Claim 1 A method for measuring a liquid crystal efficiency of a liquid crystal layer to an incident light, wherein, the method comprises: keeping a lower polarizing plate of the liquid crystal layer unchanged to make an upper polarizing plate and the lower polarizing plate of the liquid crystal layer are in a first state, in which a polarization axis of the upper polarizing plate is parallel to a polarization axis of the lower polarizing plate; in the first state, controlling a brightness of a screen of a liquid crystal panel to be 0 gray and measuring a brightness Lvx of a target position of the liquid crystal panel; in the first state, controlling the brightness of the screen of the liquid crystal panel to be 255 gray and measuring a brightness Lvy of the target position of the liquid crystal panel; according to the brightness Lvx and the brightness Lvy, determining a liquid crystal efficiency A of the liquid crystal layer to the incident light; wherein, the liquid crystal efficiency A of the liquid crystal layer to the incident light is: A = { 1 - Lvy Lvx } ⁢ % ; or, before the step of keeping the lower polarizing plate of the liquid crystal layer unchanged to make the upper polarizing plate and the lower polarizing plate of the liquid crystal in the first state, the method further comprises: making the upper polarizer plate and the lower polarizer plate of the liquid crystal layer to be in a second state, in which the polarization axis of the upper polarizing plate is perpendicular to the polarization axis of the lower polarizing plate; in the second state, controls the brightness of the screen of the liquid crystal panel to be 0 gray and measures a brightness Lvz of the target position of the liquid crystal panel; and the step of determining the liquid crystal efficiency A of the liquid crystal layer to the incident light according to the brightness Lvx and the brightness Lvy comprising: determining a liquid crystal efficiency B of the liquid crystal layer to the incident light according to the brightness Lvx, the brightness Lvy and the brightness Lvz. ### Claim 2 (depends on 1) The method according to claim 1, wherein, the liquid crystal efficiency B of the liquid crystal layer to the incident light is: B = { 1 - Lvy Lvx + Lvz } ⁢ % . ### Claim 3 (depends on 1) The method according to claim 1, wherein, the step of keeping the lower polarizing plate of the liquid crystal layer unchanged to make the upper polarizing plate and the lower polarizing plate of the liquid crystal in the first state, comprises: in the second state, removing an original upper polarizing plate, using a new polarizing plate of a same model of the original upper polarizing plate as the upper polarizing plate and attaching the new polarizing plate by deflecting 90 degrees from a polarizer attach direction along which the original upper polarizing plate being attached so as to make the upper polarizing plate and the lower polarizing plate of the liquid crystal layer to be in the first state. ### Claim 4 A method for measuring a liquid crystal efficiency of a liquid crystal layer to an incident light, wherein, the method comprises: keeping a lower polarizing plate of the liquid crystal layer unchanged to make an upper polarizing plate and the lower polarizing plate of the liquid crystal layer are in a first state, in which a polarization axis of the upper polarizing plate is parallel to a polarization axis of the lower polarizing plate; in the first state, controlling a brightness of a screen of a liquid crystal panel to be 0 gray and measuring a brightness Lvx of a target position of the liquid crystal panel; in the first state, controlling the brightness of the screen of the liquid crystal panel to be 255 gray and measuring a brightness Lvy of the target position of the liquid crystal panel; according to the brightness Lvx and the brightness Lvy, determining a liquid crystal efficiency A of the liquid crystal layer to the incident light. ### Claim 5 (depends on 4) The method according to claim 4, wherein, the liquid crystal efficiency A of the liquid crystal layer to the incident light is: A = { 1 - Lvy Lvx } ⁢ % . ### Claim 6 (depends on 4) The method according to claim 4, wherein, before the step of keeping the lower polarizing plate of the liquid crystal layer unchanged to make the upper polarizing plate and the lower polarizing plate of the liquid crystal in the first state, comprises: making the upper polarizer plate and the lower polarizer plate of the liquid crystal layer to be in a second state, in which the polarization axis of the upper polarizing plate is perpendicular to the polarization axis of the lower polarizing plate; in the second state, controlling the brightness of the screen of the liquid crystal panel to be 0 gray and measuring a brightness Lvz of the target position of the liquid crystal panel; the step of determining the liquid crystal efficiency A of the liquid crystal layer to the incident light according to the brightness Lvx and the brightness Lvy comprising: determining a liquid crystal efficiency B of the liquid crystal layer to the incident light according to the brightness Lvx, the brightness Lvy and the brightness Lvz. ### Claim 7 (depends on 6) The method according to claim 6, wherein, the liquid crystal efficiency B of the liquid crystal layer to the incident light is: B = { 1 - Lvy Lvx + Lvz } ⁢ % . ### Claim 8 (depends on 6) The method according to claim 6, wherein, the step of keeping the lower polarizing plate of the liquid crystal layer unchanged to make the upper polarizing plate and the lower polarizing plate of the liquid crystal in the first state, comprises: in the second state, removing an original upper polarizing plate, using a new polarizing plate of a same model of the original upper polarizing plate as the upper polarizing plate and attaching the new polarizing plate by deflecting 90 degrees from a polarizer attach direction along which the original upper polarizing plate being attached so as to make the upper polarizing plate and the lower polarizing plate of the liquid crystal layer to be in the first state. ### Claim 9 A method for measuring a liquid crystal efficiency of a liquid crystal layer to an incident light in a predetermined gray, wherein, the method comprises: keeping a lower polarizing plate of the liquid crystal layer unchanged to make an upper polarizing plate and the lower polarizing plate of the liquid crystal layer are in a first state, in which a polarization axis of the upper polarizing plate is parallel to a polarization axis of the lower polarizing plate; in the first state, controlling a brightness of a screen of a liquid crystal panel to be 0 gray and measuring a brightness Lvx of a target position of the liquid crystal panel; in the first state, controlling the brightness of the screen of a predetermined color of the liquid crystal panel to be a predetermined gray and measuring a brightness Lvy′ of the target position of the liquid crystal panel; according to the brightness Lvx and the brightness Lvy′, determining a liquid crystal efficiency A′ of the liquid crystal layer to the incident light of the predetermined color in the predetermined gray. ### Claim 10 (depends on 9) The method according to claim 9, wherein, the liquid crystal efficiency A′ of the liquid crystal layer to the incident light of the predetermined color in the predetermined gray is: A ′ = { 1 - Lvy ′ Lvx } ⁢ % . ### Claim 11 (depends on 9) The method according to claim 9, wherein, before the step of keeping the lower polarizing plate of the liquid crystal layer unchanged to make the upper polarizing plate and the lower polarizing plate of the liquid crystal in the first state, comprises: making the upper polarizer plate and the lower polarizer plate of the liquid crystal layer to be in a second state, in which the polarization axis of the upper polarizing plate is perpendicular to the polarization axis of the lower polarizing plate; in the second state, controlling the brightness of the screen of the liquid crystal panel to be 0 gray and measuring a brightness Lvz′ of the target position of the liquid crystal panel; the step of determining the liquid crystal efficiency A′ of the liquid crystal layer to the incident light according to the brightness Lvx and the brightness Lvy′ comprising: determining a liquid crystal efficiency B′ of the liquid crystal layer to the incident light of the predetermined color in the predetermined gray according to the brightness Lvx, the brightness Lvy′ and the brightness Lvz′. ### Claim 12 (depends on 11) The method according to claim 11, wherein, the liquid crystal efficiency B′ of the liquid crystal layer to the incident light of the predetermined color in the predetermined gray is: B ′ = { 1 - Lvy ′ Lvx + Lvz ′ } ⁢ % . ### Claim 13 (depends on 11) The method according to claim 11, wherein, the step of keeping the lower polarizing plate of the liquid crystal layer unchanged to make the upper polarizing plate and the lower polarizing plate of the liquid crystal in the first state, comprises: in the second state, removing an original upper polarizing plate, using a new polarizing plate of a same model of the original upper polarizing plate as the upper polarizing plate and attaching the new polarizing plate by deflecting 90 degrees from a polarizer attach direction along which the original upper polarizing plate being attached so as to make the upper polarizing plate and the lower polarizing plate of the liquid crystal layer to be in the first state.