Patent US20050104841A1 successfully refreshed from Google Patents.
US20050104841A1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for driving liquid crystal display
Assignee: LG Display Co Ltd
•
Filing: 2004-06-28
•
Granted: —
•
Expires: 2024-06-28
Abstract
Abstract A driving method and apparatus for a liquid crystal display is provided in which a contrast ratio of data to be displayed can be expanded and the brightness of a back light can be changed using an accumulated result of a plurality of frames. In the driving method, data to be displayed is converted into brightness components and arranged into a histogram for each frame. Second data having an expanded contrast is generated using the histograms of at least two frames, including the histogram of the current frame. Averages of the histograms are calculated and used to control the brightness of the back light. The averages may be weighted such that frames closer to the current frame have a larger effect.
Inventors
- 👤 Min Sohn
- 👤 Seong Baik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:51
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/3406; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G09G2320/00; G09G2320/02; G09G2320/0271; G09G2320/06; G09G2320/0626; G09G2320/0646; G09G2360/00; G09G2360/16; G09G3/2007; G09G3/2077
Claims Analysis
Total Claims: 48
Claim 1
Independent Claim
55 words
1 . A method of driving a display, the method comprising: (A) converting first data of a current frame to be displayed into brightness components; (B) arranging the brightness components into a current histogram; and (C) generating second data having an expanded contrast using the current histogram and a previous histogram of a previous frame.
Claim 2
Dependent Claim
55 words
1 . A method of driving a display, the method comprising: (A) converting first data of a current frame to be displayed into brightness components; (B) arranging the brightness components into a current histogram; and (C) generating second data having an expanded contrast using the current histogram and a previous histogram of a previous frame.
Claim 3
Dependent Claim
39 words
2 . The method of claim 1 , wherein (C) comprises: storing the current and previous histograms; generating an average histogram from the stored histograms by averaging the stored histograms; and generating the second data using the average histogram.
Claim 4
Dependent Claim
21 words
3 . The method of claim 2 , wherein generating the average histogram comprises assigning weighting values to the stored histograms.
Claim 5
Dependent Claim
38 words
4 . The method of claim 3 , further comprising assigning weighting values to the stored histograms having values that decrease as the frames from which the stored histograms are generated increase in distance from the current frame.
Claim 6
Dependent Claim
28 words
5 . The method of claim 3 , wherein, when the average histogram is generated, the stored histograms affect the average histogram proportional to the assigned weighting values.
Claim 7
Dependent Claim
20 words
6 . The method of claim 2 , further comprising controlling brightness of a back light using the stored histograms.
Claim 8
Dependent Claim
39 words
7 . The method of claim 6 , wherein controlling the brightness of the back light comprises: extracting a control value from the average histogram; and controlling the brightness of the back light in correspondence with the control value.
Claim 9
Dependent Claim
53 words
8 . The method of claim 6 , wherein controlling the brightness of the back light comprises: extracting a control value from each of the stored histograms; averaging the extracted control values to calculate an average control value; and controlling the brightness of the back light in correspondence with the averaged control value.
Claim 10
Dependent Claim
38 words
9 . The method of claim 7 , wherein the control value is a most-frequent value occupied by the maximum number of brightness components in the histogram or an average value of the brightness components in the histogram.
Claim 11
Dependent Claim
38 words
10 . The method of claim 8 , wherein each control value is a most-frequent value occupied by the maximum number of brightness components in the histogram or an average value of the brightness components in the histogram.
Claim 12
Dependent Claim
116 words
11 . A method of driving a display, the method comprising: (A) converting first data of a current frame into brightness components and chrominance components; (B) arranging the brightness components into a histogram; (C) storing histograms of a plurality of frames; (D) generating an average histogram from the stored histograms; (E) converting brightness components of the average histogram to have an expanded contrast; (F) generating second data having an expanded contrast from that of the first data using the converted brightness components and the chrominance components; and (G) re-arranging the second data such that the second data can be applied to a liquid crystal display panel, thereby applying the re-arranged second data to a data driver.
Claim 13
Dependent Claim
116 words
11 . A method of driving a display, the method comprising: (A) converting first data of a current frame into brightness components and chrominance components; (B) arranging the brightness components into a histogram; (C) storing histograms of a plurality of frames; (D) generating an average histogram from the stored histograms; (E) converting brightness components of the average histogram to have an expanded contrast; (F) generating second data having an expanded contrast from that of the first data using the converted brightness components and the chrominance components; and (G) re-arranging the second data such that the second data can be applied to a liquid crystal display panel, thereby applying the re-arranged second data to a data driver.
Claim 14
Dependent Claim
26 words
12 . The method of claim 11 , further comprising delaying the chrominance components such that the chrominance components are synchronized with the converted brightness components.
Claim 15
Dependent Claim
27 words
13 . The method of claim 11 , further comprising converting synchronizing signals inputted in synchronization with the first data to be synchronized with the second data.
Claim 16
Dependent Claim
25 words
14 . The method of claim 11 , wherein storing the histograms comprises storing histograms of at least two frames adjacent to the current frame.
Claim 17
Dependent Claim
42 words
15 . The method of claim 14 , wherein generating the average histogram comprises assigning weighting values to the stored histograms having values that decrease as the frames from which the stored histograms are generated increase in distance from the current frame.
Claim 18
Dependent Claim
20 words
16 . The method of claim 11 , further comprising controlling brightness of a back light using the stored histograms.
Claim 19
Dependent Claim
39 words
17 . The method of claim 16 , wherein controlling the brightness of the back light comprises: extracting a control value from the average histogram; and controlling the brightness of the back light in correspondence with the control value.
Claim 20
Dependent Claim
53 words
18 . The method of claim 16 , wherein controlling the brightness of the back light comprises: extracting a control value from each of the stored histograms; averaging the extracted control values to calculate an average control value; and controlling the brightness of the back light in correspondence with the average control value.
Claim 21
Dependent Claim
44 words
19 . A method of driving a display, comprising: (A) converting data of each frame to be displayed into brightness components; (B) arranging the brightness components into a histogram; and (C) controlling brightness of a back light using histograms of at least two frames.
Claim 22
Dependent Claim
44 words
19 . A method of driving a display, comprising: (A) converting data of each frame to be displayed into brightness components; (B) arranging the brightness components into a histogram; and (C) controlling brightness of a back light using histograms of at least two frames.
Claim 23
Dependent Claim
40 words
20 . The method of claim 19 , wherein (C) comprises: generating an average histogram from the histograms; extracting a control value from the average histogram; and controlling the brightness of the back light in correspondence with the control value.
Claim 24
Dependent Claim
46 words
21 . The method of claim 19 , wherein (C) comprises: extracting a control value from each of the histograms; averaging the extracted control values to calculate an average control value; and controlling the brightness of the back light in correspondence with the average control value.
Claim 25
Dependent Claim
38 words
22 . The method of claim 20 , wherein the control value is a most-frequent value occupied by the maximum number of brightness components in the histogram of an average value of the brightness components in the histogram.
Claim 26
Dependent Claim
38 words
23 . The method of claim 21 , wherein each control value is a most-frequent value occupied by the maximum number of brightness components in the histogram of an average value of the brightness components in the histogram.
Claim 27
Dependent Claim
40 words
24 . The method of claim 22 , wherein the brightness components are divided into a plurality of brightness areas and the brightness of the back light is controlled corresponding to the brightness area to which the control value belongs.
Claim 28
Dependent Claim
40 words
25 . The method of claim 23 , wherein the brightness components are divided into a plurality of brightness areas and the brightness of the back light is controlled corresponding to the brightness area to which the control value belongs.
Claim 29
Dependent Claim
27 words
26 . The method of claim 24 , wherein the brightness of the back light is set differently for each area to which the control value belongs.
Claim 30
Dependent Claim
27 words
27 . The method of claim 25 , wherein the brightness of the back light is set differently for each area to which the control value belongs.
Claim 31
Dependent Claim
50 words
28 . The method of claim 19 , further comprising assigning a weighting value to each of the histograms such that histograms have increasing effect with respect to the brightness of the back light as the frames from which the histograms are generated decrease in distance from a current frame.
Claim 32
Dependent Claim
77 words
29 . A driving apparatus for a display, comprising: a brightness/color separator for extracting brightness components from first data; a histogram analyzer for converting the brightness components of each frame into a histogram; a storage for storing histograms of at least two frames analyzed by the histogram analyzer; an average value calculator for generating an average histogram from the stored histograms; and a data processor for expanding a contrast of the brightness components using the average histogram.
Claim 33
Dependent Claim
77 words
29 . A driving apparatus for a display, comprising: a brightness/color separator for extracting brightness components from first data; a histogram analyzer for converting the brightness components of each frame into a histogram; a storage for storing histograms of at least two frames analyzed by the histogram analyzer; an average value calculator for generating an average histogram from the stored histograms; and a data processor for expanding a contrast of the brightness components using the average histogram.
Claim 34
Dependent Claim
53 words
30 . The driving apparatus of claim 29 , further comprising: a brightness/color mixer for generating second data having an expanded contrast using converted brightness components and chrominance components from the data processor; and a delay for delaying the chrominance components such that the chrominance components are synchronized with the converted brightness components.
Claim 35
Dependent Claim
49 words
31 . The driving apparatus of claim 29 , further comprising a weighting value assigner for assigning weighting values to the stored histograms having values that decrease as the frames from which the stored histograms are generated increase in distance from a current frame when producing the average histogram.
Claim 36
Dependent Claim
27 words
32 . The driving apparatus of claim 29 , wherein the average value calculator averages control values from the stored histograms to calculate an average control value.
Claim 37
Dependent Claim
36 words
33 . The driving apparatus of claim 32 , further comprising a back light controller for controlling the brightness of the back light using a control value of the average histogram or the average control value.
Claim 38
Dependent Claim
77 words
34 . A method of driving a display, the method comprising: (A) converting first data of a current frame to be displayed into brightness components; (B) arranging the brightness components into a histogram; (C) storing the histogram of the current frame along with a plurality of histograms of frames preceding the current frame; (D) generating an average histogram from the stored histograms by averaging the stored histograms; and (E) generating the second data using the average histogram.
Claim 39
Dependent Claim
77 words
34 . A method of driving a display, the method comprising: (A) converting first data of a current frame to be displayed into brightness components; (B) arranging the brightness components into a histogram; (C) storing the histogram of the current frame along with a plurality of histograms of frames preceding the current frame; (D) generating an average histogram from the stored histograms by averaging the stored histograms; and (E) generating the second data using the average histogram.
Claim 40
Dependent Claim
32 words
35 . The method of claim 34 , further comprising: extracting a control value from the average histogram; and controlling a brightness of a back light in correspondence with the control value.
Claim 41
Dependent Claim
46 words
36 . The method of claim 34 , further comprising: extracting a control value from each of the stored histograms; averaging the extracted control values to calculate an average control value; and controlling a brightness of a back light in correspondence with the averaged control value.
Claim 42
Dependent Claim
38 words
37 . The method of claim 35 , wherein the control value is a most-frequent value occupied by the maximum number of brightness components in the histogram or an average value of the brightness components in the histogram.
Claim 43
Dependent Claim
38 words
38 . The method of claim 36 , wherein each control value is a most-frequent value occupied by the maximum number of brightness components in the histogram or an average value of the brightness components in the histogram.
Claim 44
Dependent Claim
21 words
39 . The method of claim 34 , wherein generating the average histogram comprises assigning weighting values to the stored histograms.
Claim 45
Dependent Claim
38 words
40 . The method of claim 39 , wherein the weighting values assigned to the stored histograms have values that decrease as the frames from which the stored histograms are generated increase in distance from the current frame.
Claim 46
Dependent Claim
29 words
41 . The method of claim 40 , wherein the stored histograms of frames beyond a predetermined distance from the current frame essentially do not affect the average histogram.
Claim 47
Dependent Claim
23 words
42 . The method of claim 34 , wherein only a limited number of histograms of frames preceding the current frame are stored.
Claim 48
Dependent Claim
17 words
43 . The method of claim 42 , wherein only the histograms of consecutive frames are stored.
References Cited (Backward Citations)
US3111732A
Cited
US5325910A
Cited
US4766948A
Cited
US5207974A
Cited
US5255731A
Cited
US5620671A
Cited
US6152052A
Cited
US6354363B1
Cited
US6373979B1
Cited
US6419004B1
Cited
US20010033260A1
Cited
US6491087B1
Cited
US20020057238A1
Cited
US20020070914A1
Cited
US7129975B2
Cited
US20030020974A1
Cited
US20030002736A1
Cited
US20030151565A1
Cited
US20030222841A1
Cited
US6778183B1
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.