Method and apparatus for compensating data voltages for liquid crystal display panel

The method of 1, wherein the determining the cell gap distribution comprises determining the respective cell gaps at the different regions from the following equation:

• d
• i
• =
• ɛ
• r
• ⁢
• S
• i
• 4
• ⁢
• π
• ⁢
• ⁢
• kC
• i
• -
• d
• g
• ,
• where d1 represents the cell gap at an i-th one of the regions, i is a natural number, εr represents a permittivity, Si represents an overlap area of the first and second electrode blocks of the plate capacitor at the i-th region, k represents an electrostatic force constant, Ci represents a capacitance of the plate capacitor at the i-th region, and dg represents a sum of thicknesses of the first and second substrates.

An apparatus for determining compensating data voltages for a liquid crystal display panel, the liquid crystal display panel comprising a liquid crystal cell defined by a first substrate and a second substrate arranged opposite to each other, the liquid crystal cell having non-uniform cell gaps across the liquid crystal cell, the device comprising:

• an input module configured to receive a capacitance distribution across the liquid crystal cell, the capacitance distribution indicating respective capacitances presented by the liquid crystal cell at different regions of the liquid crystal cell;
• a cell gap distribution determination module configured to determine a cell gap distribution across the liquid crystal cell based on the capacitance distribution, the cell gap distribution indicating respective cell gaps of the liquid crystal cell at the different regions;
• and
• a compensation voltage derivation module configured to derive, from the cell gap distribution, respective compensation voltages for different data voltages for each of the different regions, the compensation voltages being such that the liquid crystal cell has substantially a same transmittance at the different regions for a same data voltage,
• wherein the compensation voltage derivation module is further configured to:
• a) acquire functional relationships between the transmittance and the data voltage at the respective cell gaps;
• b) with reference to the functional relationship at a specific one of the respective cell gaps, derive from the functional relationships a data voltage corresponding to a specific transmittance at the specific cell gap and data voltages corresponding to the specific transmittance at remaining ones of the cell gaps;
• c) calculate respective changes in the data voltages at the remaining cell gaps relative to the data voltage at the specific cell gap as respective compensation voltages for the data voltages at the remaining cell gaps;
• and
• d) repeat b) and c) to derive respective compensation voltages for the data voltages at the remaining cell gaps for various specific transmittances;
• wherein the liquid crystal display panel comprises an array of first electrode blocks arranged across a first surface of the first substrate and an array of second electrode blocks arranged across a second surface of the second substrate, wherein the first surface and the second surface are facing away from the inside of the liquid crystal cell, each first electrode block is opposite to a second electrode block to form a respective plate capacitor, and the capacitance distribution is obtained by measuring capacitances of respective plate capacitors at different regions.

A system for compensating data voltages for a liquid crystal display panel, the liquid crystal display panel comprising a liquid crystal cell defined by a first substrate and a second substrate arranged opposite to each other, the liquid crystal cell having non-uniform cell gaps across the liquid crystal cell, the system comprising:

• a capacitance meter configured to measure a capacitance distribution across the liquid crystal cell, the capacitance distribution indicating respective capacitances presented by the liquid crystal cell at different regions of the liquid crystal cell;
• and
• an apparatus comprising:
• an input module configured to receive the capacitance distribution;
• a cell gap distribution determination module configured to determine a cell gap distribution across the liquid crystal cell based on the capacitance distribution, the cell gap distribution indicating respective cell gaps of the liquid crystal cell at the different regions;
• and
• a compensation voltage derivation module configured to derive, from the cell gap distribution, respective compensation voltages for different data voltages for each of the different regions, the compensation voltages being such that the liquid crystal cell has substantially a same transmittance at the different regions for a same data voltage,
• wherein the compensation voltage derivation module is further configured to:
• a) acquire functional relationships between the transmittance and the data voltage at the respective cell gaps;
• b) with reference to the functional relationship at a specific one of the respective cell gaps, derive from the functional relationships a data voltage corresponding to a specific transmittance at the specific cell gap and data voltages corresponding to the specific transmittance at remaining ones of the cell gaps;
• c) calculate respective changes in the data voltages at the remaining cell gaps relative to the data voltage at the specific cell gap as respective compensation voltages for the data voltages at the remaining cell gaps;
• and
• d) repeat b) and c) to derive respective compensation voltages for the data voltages at the remaining cell gaps for various specific transmittances;
• wherein the liquid crystal display panel comprises an array of first electrode blocks arranged across a first surface of the first substrate and an array of second electrode blocks arranged across a second surface of the second substrate, wherein the first surface and the second surface are facing away from the inside of the liquid crystal cell, each first electrode block is opposite to a second electrode block to form a respective plate capacitor, and the capacitance meter is configured to measure capacitances of respective plate capacitors at different regions.