Method for driving a light source, light source apparatus for performing the method and display apparatus having the light source apparatus
View Patent ↗A method of driving a light source includes: determining a location of pixel data of a display relative to a plurality of light-emitting blocks of a light source, obtaining a plurality of luminance values of the light-emitting blocks corresponding to the location by using a lookup table (LUT) storing the luminance values of the light-emitting blocks, generating a plurality of histograms corresponding to the light-emitting blocks, determining a plurality of target luminance values of the light-emitting blocks using the histograms, and driving the light-emitting blocks using the determined target luminance values. The luminance values of the light-emitting blocks are based on the location of the pixel data within an image block of the display corresponding to each light-emitting block. Each of the histograms indicates a frequency of each of the luminance values of a respective one of the light-emitting blocks.
1. A method for driving a light source, the method comprising:
determining which one of the light-emitting blocks the pixel data corresponds to, the one light-emitting block corresponding to an image block of the display comprising a plurality of lines;
determining which one of the lines of the image block the pixel data corresponds to;
referring to a lookup table (LUT) comprising an address for each line and an entry for each address, the entry including a plurality of luminance values of the light-emitting blocks;
obtaining the luminance values of the light-emitting blocks by using the entry of the LUT corresponding to the determined one line;
generating a plurality of histograms corresponding to the light-emitting blocks, each of the histograms indicating a frequency of each of the luminance values of a respective one of the light-emitting blocks;
determining a plurality of target luminance values of the light-emitting blocks by using the histograms of the light-emitting blocks; and
driving the light-emitting blocks by using the determined target luminance values.
2. The method of claim 1 , wherein the entry includes a luminance value of a self light-emitting block corresponding to the image block including the pixel data and a luminance value of at least one peripheral light-emitting block disposed adjacent to the self light-emitting block.
3. The method of claim 1 , wherein the luminance values stored in the LUT correspond to a maximum gray scale value of an entire gray scale range of the pixel data.
4. The method of claim 3 , further comprising: adjusting levels of the luminance values obtained from the LUT according to a gray scale value of the pixel data.
5. The method of claim 1 , wherein the light-emitting blocks are disposed in a one-dimensional arrangement.
6. The method of claim 1 , wherein the light-emitting blocks are disposed in a two-dimensional arrangement.
7. A light source apparatus comprising:
a light source module including a plurality of light-emitting blocks;
an analyzing part analyzing pixel data of a display to determine which one of the light-emitting blocks the pixel data corresponds to, the one light-emitting block corresponding to an image block of the display comprising a plurality of lines, the analyzing part further determining which one of the lines of the image block the pixel data corresponds to;
a lookup table (LUT) comprising an address for each line and an entry for each address, wherein the entry includes a luminance value of a self light-emitting block corresponding to the image block including the pixel data and a luminance value of at least one peripheral light-emitting block disposed adjacent to the self light-emitting block;
a target luminance determining part obtaining a plurality of target luminance values corresponding to the light-emitting blocks by using the entry of the LUT corresponding to the determined one line; and
a driving signal generating part generating a plurality of driving signals driving the light-emitting blocks by using the determined target luminance values.
8. The light source apparatus of claim 7 , further comprising: a histogram generating part generating a plurality of histograms corresponding to the light-emitting blocks, each of the histograms indicating a frequency of the luminance values of a respective one of the light-emitting blocks, wherein the target luminance determining part determines the target luminance values corresponding to the light-emitting blocks by using the histograms of the light-emitting blocks.
9. The light source apparatus of claim 7 , wherein the luminance values stored in the LUT correspond to a maximum gray scale value of an entire gray scale range of the pixel data.
10. The light source apparatus of claim 9 , further comprising: a luminance adjusting part adjusting levels of the target luminance values obtained from the LUT according to a gray scale value of the pixel data.
11. The light source apparatus of claim 7 , wherein each of the light-emitting blocks includes at least one lamp.
12. The light source apparatus of claim 7 , wherein each of the light-emitting blocks includes at least one light emitting diode (LED).
13. A display apparatus comprising:
a display panel configured to display an image;
a light source module includes a plurality of light-emitting blocks;
an analyzing part analyzing pixel data of a display to determine which one of the light-emitting blocks the pixel data corresponds to, the one light-emitting block corresponding to an image block of the display comprising a plurality of lines, the analyzing part further determining which one of the lines of the image block the pixel data corresponds to;
a lookup table (LUT) comprising an address for each line and an entry for each address, wherein the entry includes a luminance value of a self light-emitting block corresponding to the image block including the pixel data and a luminance value of at least one peripheral light-emitting block disposed adjacent to the self light-emitting block;
a target luminance determining part obtaining a plurality of target luminance values corresponding to the light-emitting blocks by using the entry of the LUT corresponding to the determined one line; and
a driving signal generating part generating a plurality of driving signals driving the light-emitting blocks by using the determined target luminance values.
14. The display apparatus of claim 13 , further comprising: a compensating part compensating the pixel data by using the target luminance values of the light-emitting blocks received from the target luminance determining part.
15. The display apparatus of claim 14 , further comprising: a data driving part converting the compensated pixel data into an analog data voltage, to provide the display panel with the analog data voltage.
16. The display apparatus of claim 13 , further comprising: a histogram generating part generating a plurality of histograms corresponding to the light-emitting blocks, each of the histograms indicating a frequency of the luminance values of a respective one of the light-emitting blocks, wherein the target luminance determining part determines the target luminance values corresponding to the light-emitting blocks by using the histograms of the light-emitting blocks.
17. The display apparatus of claim 13 , wherein the luminance values stored in the LUT correspond to a maximum gray scale of an entire gray scale range of the pixel data.
18. The display apparatus of claim 17 , further comprising: a luminance adjusting part adjusting the luminance values obtained from the LUT according to a gray scale value of the pixel data.
19. The display apparatus of claim 13 , wherein each of the light-emitting blocks includes at least one lamp, and the light-emitting blocks are disposed in a one-dimensional arrangement.
20. The display apparatus of claim 13 , wherein each of the light-emitting blocks includes at least one light emitting diode (LED), and the light-emitting blocks are disposed in a two-dimensional arrangement.