Data processing apparatus for organic light emitting display device

Patent metadata

Field	Value
Publication number	US-9715716-B2
Application number	US-201514739843-A
Country	US
Kind code	B2
Filing date	Jun 15, 2015
Priority date	Jun 26, 2014
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

Provided is a data processing apparatus of an organic light emitting display device, which performs encoding and decoding through different schemes according to frequency components and data components, thereby preventing loss of a high frequency component included in data.

First claim

What is claimed is:

1. A data processing apparatus coupled between a first memory and a second memory, comprising:
a data encoder coupled between the first memory and the second memory, the data encoder configured to:
receive mobility compensation data from the first memory, the mobility compensation data to compensate for non-uniformity of mobility of a transistor of a display device,
encode the mobility compensation data according to difference values of the mobility compensation data, each of the difference values being a difference between two corresponding adjacent values of the mobility compensation data, and
transmit the encoded mobility compensation data to the second memory.

2. The data processing apparatus of claim 1 , wherein the data encoder comprises:
a frequency classifier coupled between the first memory and the second memory, the frequency classifier configured to:
classify the mobility compensation data into first compensation data and second compensation data according to the difference values,
generate a first flag bit responsive to classifying the mobility compensation data into the first compensation data having the difference values below a threshold value, and
generate a second flag bit responsive to classifying the mobility compensation data into the second compensation data having the difference values above the threshold value;

a low frequency encoder coupled between the frequency classifier and the second memory, the low frequency encoder configured to encode the first compensation data according to the first flag bit to generate first encoded data;
a high frequency encoder coupled between the frequency classifier and the second memory in parallel with the low frequency encoder, the high frequency encoder configured to encode the second compensation data according to the second flag bit to generate second encoded data; and
an output interface coupled between the low frequency encoder and the second memory and coupled between the high frequency encoder and the second memory, the output interface configured to output at least one of the first encoded data and the second encoded data, as the encoded data to the second memory.

3. The data processing apparatus of claim 2 , wherein the low frequency encoder comprises:
a sampler coupled to the frequency classifier, the sampler configured to obtain a representative value, based on which the first compensation data is encoded, and generate intermediate data based on the representative value; and
a bit quantizer coupled between the sampler and the output interface, the bit quantizer configured to quantize the intermediate data to N (N is a natural number)-bit data and insert the first flag bit into the N-bit data to generate the first encoded data.

4. The data processing apparatus of claim 3 , wherein the bit quantizer is configured to remove a least significant bit of the N-bit data, and to insert the first flag bit to a front of a most significant bit of the N-bit data.

5. The data processing apparatus of claim 2 , further comprising:
a code book configured to store a plurality of vector profiles and a plurality of indices corresponding to the plurality of vector profiles,
wherein the high frequency encoder comprises:
a representative vector generator coupled to the frequency classifier, the representative vector generator configured to generate a representative vector based on a representative value of the second compensation data, the representative value based on which the second compensation data is encoded, and generate a representative vector profile based on the representative vector; and
a vector quantizer coupled between the representative vector generator and the output interface, the vector quantizer configured to extract an index of one vector profile corresponding to the representative vector profile from the code book, generate N-bit data based on the plurality of indices, and replace at least one bit of the N-bit data with the second flag bit to generate the second encoded data.

6. The data processing apparatus of claim 5 , wherein the representative vector generator is configured to generate intermediate data by extracting the representative value, and to generate the representative vector according to differences between the second compensation data and the intermediate data.

7. The data processing apparatus of claim 5 , wherein the representative vector generator is configured to extract the representative value from the second compensation data according to a position of high frequency data included in the second compensation data determined based on the difference values, or to extract a moving average value as the representative value.

8. The data processing apparatus of claim 7 , wherein the moving average value is an average value of a plurality of previous data encoded by the data encoder.

9. The data processing apparatus of claim 5 , wherein the vector quantizer is configured to replace a most significant bit of the N-bit data with the second flag bit.

10. The display processing apparatus of claim 1 , wherein the transistor is a driving transistor for driving an organic light emitting diode of the display device, and wherein the mobility compensation data include information for compensating for the non-uniformity of the mobility due to degradation of the driving transistor.

11. A data processing apparatus coupled between a first memory and a second memory, comprising:
a data decoder coupled between the first memory and the second memory, the data decoder configured to:
receive updated encoded mobility compensation data from the second memory, the updated encoded mobility compensation data being updated after compensating for non-uniformity of mobility of a transistor of a display device,
decode the updated encoded mobility compensation data according to a flag bit of the updated encoded mobility compensation data, the flag bit indicating whether the decoded mobility compensation data has any difference value of difference values above a threshold value, each of the difference values being a difference between two corresponding adjacent values of the decoded mobility compensation data, and
transmit the decoded mobility compensation data to the first memory.

12. The data processing apparatus of claim 11 , wherein the data decoder comprises:
a data classifier coupled between the second memory and the first memory, the data classifier configured to classify the updated encoded mobility compensation data into first encoded data and second encoded data according to the flag bit of the updated encoded mobility compensation data;
a low frequency decoder coupled between the data classifier and the first memory, the low frequency decoder configured to decode the first encoded data to generate first decoded data;
a high frequency decoder coupled between the data classifier and the first memory in parallel with the low frequency decoder, the high frequency decoder configured to decode the second encoded data to generate second decoded data; and
an output interface coupled between the low frequency decoder and the first memory and coupled between the high frequency decoder and the first memory, the output interface configured to output at least one of the first decoded data and the second decoded data, as the decoded data to the first memory.

13. The data processing apparatus of claim 12 , wherein the low frequency decoder comprises:
a bit dequantizer coupled to the data classifier, the bit dequantizer configured to add 1-bit data to the first encoded data and generate a representative value, based on which the first encoded data is decoded, throug

Assignees

• Lg Display Co Ltd

Inventors

• Song Jihee
• Oh Euiyeol
• Lee Jooyong

Classifications

• G09G3/3208 Primary

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• G09G2320/045

  Compensation of drifts in the characteristics of light emitting or modulating elements · CPC title

• G06T1/20

  Processor architectures; Processor configuration, e.g. pipelining · CPC title

• G06T1/60 Primary

  Memory management · CPC title