# US 10,768,455 B2 · Data compensation method and apparatus for liquid crystal display screen

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- Number: US 10,768,455 B2
- Document ID: US10768455B2
- Status: Granted
- Kind: B2
- Application number: 15/743,255
- Filed: 2017-07-21
- Published: 2020-03-12
- Granted: 2020-09-08
- Earliest claimed: 2016-08-19
- Assignees: Boe Technology Group Co., Ltd.; Beijing Boe Display Technology Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.; Beijing Boe Display Technology Co., Ltd.
- Inventors: Luqiang Guo; Liugang Zhou; Shou Li; Jianming Wang; Shuhuan Yu; Chenxi Liu; Jian Zhang
- Web page: https://patentgrep.com/patent/US10768455B2

## CPC

- G02F 1/1309: {Repairing; Testing}
- G02F 1/13363: Birefringent elements, e.g. for optical compensation
- G09G 3/36: using liquid crystals
- G09G 2320/02: Improving the quality of display appearance
- G09G 2320/0285: using tables for spatial correction of display data
- G09G 2320/041: Temperature compensation
- G09G 2330/026: Arrangements or methods related to booting a display
- 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
- 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

A data compensation method and apparatus for a liquid crystal display screen are described herein. Said method comprises determining a timing length ΔT′ from the last turn-off of the liquid crystal display screen upon turn-on of the liquid crystal display screen, and determining a mura data compensation table am called at the time of the last turn-off; determining a mura data compensation table to be called at the time of the present turn-on according to a pre-set time length T needed for stabilization of mura, mura data compensation tables corresponding to pre-set different time periods, said timing length ΔT′, and said mura data compensation table am; performing data compensation starting from the determined mura data compensation table to be called at the time of the present turn-on. By using said method for data compensation, an appropriate initial data compensation table can be determined to obtain a better compensation effect.

## Claims

### Claim 1

A data compensation method for a liquid crystal display screen, comprising:
determining a timing length from a last turn-off of the liquid crystal display screen upon a turn-on of the liquid crystal display screen, and determining a previous mura data compensation table called at a time of the last turn-off;
determining a mura data compensation table to be called at a time of the present turn-on according to a pre-set time length needed for stabilization of mura, mura data compensation tables corresponding to pre-set different time periods, said determined timing length, and said previous data compensation table;
performing data compensation starting from the determined mura data compensation table to be called at the time of the present turn-on.

### Claim 2 (depends on 1)

The method according to claim 1, wherein said determining a timing length from the last turn-off comprises:
determining a time from the last turn-off to the present turn-on as the timing length from the last turn-off.

### Claim 3 (depends on 1)

The method according to claim 1, wherein said determining a timing length from the last turn-off comprises;
in response to the timing length reaching the pre-set time length needed for stabilization of mura, timing is stopped.

### Claim 4 (depends on 1)

The method according to claim 1, wherein said determining a mura data compensation table to be called at the time of the present turn-on comprises:
determining whether the timing length is smaller than the time length needed for stabilization of mura;
if the timing length is smaller than the time length needed for stabilization of mura, determining a mura data compensation table to be called at the time of the present turn-on according to the time length needed for stabilization of mura, the mura data compensation tables corresponding to pre-set different time periods, the timing length, and the previous mura data compensation table wherein the pre-set different time periods correspond to different mura data compensation tables, and said time length includes N time periods with a same period length, and wherein the (n+1)th time period [n*the period length, (n+1)*the period length] corresponds to a nth mura data compensation table, n is an integer within the range of [0, N−1] and N is an integer; and time periods after said time length correspond to a Nth mura data compensation table;
if the timing length is greater than or equal to the time length needed for stabilization of mura, determining a mura data compensation table to be called at the time of the present turn-on to be the mura data compensation table corresponding to the first time period in said time length.

### Claim 5 (depends on 4)

The method according to claim 4, wherein said if the timing length is smaller than the time length needed for stabilization of mura, determining a mura data compensation table to be called at the time of the present turn-on according to said time length needed for stabilization of mura, the mura data compensation tables corresponding to pre-set different time periods, said timing length, and said previous mura data compensation table comprises:
determining if a difference between an index of the time period corresponding to the previous mura data compensation table and a value of the timing length divided by the time length is greater than zero; if yes, determining that the mura data compensation table called at the time of the present turn-on is an nth mura data compensation table according to the equation n=[the difference]; otherwise, determining that the mura data compensation table to be called at the time of the present turn-on is the mura data compensation table corresponding to the first time period in said time length.

### Claim 6 (depends on 4)

The method according to claim 4, wherein the mura data compensation tables corresponding to different time periods are pre-set by the following steps:
starting from the start-up time, erasing mura using a mura erasing device to obtain an initial mura data compensation table then erasing the mura once every the time length until the mura is stable, thereby obtaining and storing mura data compensation tables corresponding to all the time periods.

### Claim 7

A data compensation apparatus for a liquid crystal display screen, comprising:
a timing and compensation data table determining component configured to determine a timing length from a last turn-off of the liquid crystal display screen upon a turn-on of the liquid crystal display screen; determine a previous mura data compensation table called at a time of the last turn-off; determine a mura data compensation table to be called at a time of the present turn-on according to a pre-set time length needed for stabilization of mura, mura data compensation tables corresponding to pre-set different time periods, said determined timing length, and said previous mura data compensation table;
a data compensation component configured to perform data compensation starting from the determined mura data compensation table to be called at the time of the present turn-on.

### Claim 8 (depends on 7)

The data compensation apparatus according to claim 7, wherein said timing and compensation data table determining component is configured to determine a time from the last turn-off to the present turn-on as the timing length from the last turn-off in response to determining the timing length from the last turn-off.

### Claim 9 (depends on 7)

The data compensation apparatus according to claim 7, wherein said timing and compensation data table determining component is further configured to:
stop the timing in response to the timing length reaching the time length needed for stabilization of mura.

### Claim 10 (depends on 7)

The data compensation apparatus according to claim 7, wherein said timing and compensation data table determining component is configured, in response to determining the mura data compensation table to be called at the time of the present turn-on, to:
determine whether the timing length is smaller than the time length needed for stabilization of mura;
determine a mura data compensation table to be called at the time of the present turn-on according to the time length needed for stabilization of mura, the mura data compensation tables corresponding to pre-set different time periods, the timing length, and the previous mura data compensation table if the timing length is smaller than the time length needed for stabilization of mura; wherein the pre-set different time periods correspond to different mura data compensation tables, and said time length includes N time periods with a period; length, wherein the (n+1)th time period [n*the time length, (n+1)*the time length] corresponds to a nth mura data compensation table n is an integer within the range of [0, N−1] and N is an integer; and time periods after said time length correspond to a Nth mura data compensation table;
determine a mura data compensation table to be called at the time of the present turn-on to be the mura data compensation table corresponding to the first time period in said time length, if the timing length is greater than or equal to the time length needed for stabilization of mura.

### Claim 11 (depends on 10)

The data compensation apparatus according to claim 10, wherein under the condition of determining the mura data compensation table to be called at the time of the present turn-on according to said time length needed for stabilization of mura, the mura data compensation tables corresponding to pre-set different time periods, said timing length, and said previous mura data compensation table if the timing length is smaller than the time length needed for stabilization of mura, said timing and compensation data table determining component is configured to:
determine if a difference between an index of the time period corresponding to the previous mura data compensation table and a value of the timing length divided by the time length is greater than zero; if yes, determine that the mura data compensation table initially called at the time of the present turn-on is an nth mura data compensation table according to the equation n=[the difference]; otherwise, determine that the mura data compensation table to be called at the time of the present turn-on is the mura data compensation table corresponding to the first time period in said time length.

### Claim 12 (depends on 9)

The data compensation apparatus according to claim 9, further comprising a configuring component which is configured to pre-configure the mura data compensation tables corresponding to different time periods in such a way as: starting from the start-up time, erasing mura using a mura erasing device to obtain an initial mura data compensation table; then erasing the mura once every the period length until the mura is stable, thereby obtaining and storing mura data compensation tables corresponding to all the time periods.