Memory protection device and method and organic light emitting display device including the same

• US 10,503,422 B2
• Filed: 10/25/2016
• Issued: 12/10/2019
• Est. Priority Date: 10/29/2015
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Hyojin, Jang, Suhyuk, Hong, Sungwan
• Primary Examiner(s): Wu, Sing-Wai
• Application Number:
  US15/333,482
• Publication Number:
  US 20170123668A1
• Time in Patent Office: 1,141 Days
• CPC Class Codes: G06F 3/0623 in relation to content
• CPC Class Codes: G06F 3/064 Management of blocks
• CPC Class Codes: G06F 3/0679 Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
• CPC Class Codes: G09G 2300/0814 used for selection purposes, e.g. logical AND for partial update
• CPC Class Codes: G09G 2300/0852 being a dynamic memory with more than one capacitor
• CPC Class Codes: G09G 2300/0861 with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
• CPC Class Codes: G09G 2300/0876 Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 2360/12 Frame memory handling
• CPC Class Codes: G09G 2360/18 Use of a frame buffer in a display terminal, inclusive of the display panel
• CPC Class Codes: G09G 3/2096 Details of the interface to the display terminal specific for a flat panel suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
• CPC Class Codes: G09G 5/393 Arrangements for updating the contents of the bit-mapped memory
• CPC Class Codes: H04N 19/44 Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder

Abstract

A memory protection device for protecting information stored in a memory includes a transmission block processing transmission data including state information of a display panel to generate original data in compliance with a transmission interface standard, an encoding unit connected to an output terminal of the transmission block and modulating a portion of the original data so as to be different from an original value to generate encoding data, and an inputoutput controller writing the encoding data into the memory according to the transmission interface standard.

Claims

1. A memory protection device for protecting information stored in a memory, the memory protection device comprising:

a transmission circuit processing transmission data including state information of a display panel to generate original data in compliance with a transmission interface standard;

an encoding circuit connected to an output terminal of the transmission circuit and modulating a portion of the original data so as to be different from an original value to generate encoding data;

an input/output controller writing the encoding data into the memory according to the transmission interface standard;

a decoding circuit inversely modulating encoding data read out from the memory by the input/output controller to generate decoding data which is the same as the original data;

a reception circuit processing the decoding data to generate reception data which is the same as the transmission data; and

a logic circuit calculating a difference value between transmission data of an Nth (N is a positive integer) frame and reception data of an (N−

1)th frame and modulating an input digital video data on the basis of a compensation value in accordance with the difference value, and generating a modulated digital video data to be input to the display panel,

wherein the transmission data of the Nth frame and the reception data of (N−

1)th frame are sensing data obtained from the display panel, and

wherein the input digital video data and the modulated digital video data have the same bits.

2. The memory protection device of claim 1, wherein a portion of the encoding data is different from the original data, and the remainder, excluding the portion, of the encoding data is the same as the original data.

3. The memory protection device of claim 2, wherein the encoding circuit and the decoding circuit each include a plurality of logic gates, and the logic gates include an exclusive-OR (XOR) gate implementing XOR.

4. The memory protection device of claim 3, wherein the encoding circuit XORs first original data and second original data through the XOR gate and outputs first encoding data having a value different from each of the first original data and the second original data, and outputs any one of the first original data and the second original data, as second encoding data.

5. The memory protection device of claim 1, wherein the transmission data of the Nth frame, the reception data of (N−

1)th frame and the modulated digital video data are implemented with the same bits.

6. An organic light emitting display device comprising:

a display panel;

a memory that stores state information of the display panel; and

a memory protection device that protects the state information stored in the memory,

wherein the memory protection device comprises;

a transmission circuit that processes transmission data including the state information of the display panel to generate original data in compliance with a transmission interface standard;

an encoding circuit connected to an output terminal of the transmission circuit that modulates a portion of the original data so as to be different from an original value to generate encoding data;

an input/output controller that writes the encoding data into the memory according to the transmission interface standard;

a decoding circuit inversely modulating encoding data read out from the memory by the input/output controller to generate decoding data which is the same as the original data;

a reception circuit processing the decoding data to generate reception data which is the same as the transmission data; and

a logic circuit calculating a difference value between transmission data of an Nth (N is a positive integer) frame and reception data of an (N−

1)th frame and modulating an input digital video data on the basis of a compensation value in accordance with the difference value, and generating a modulated digital video data to be input to the display panel,

wherein the transmission data of the Nth frame and the reception data of (N−

1)th frame are sensing data obtained from the display panel, and

wherein the input digital video data and the modulated digital video data have the same bits.

7. The organic light emitting display device of claim 6, wherein a portion of the encoding data is different from the original data, and the remainder, excluding the portion, of the encoding data is the same as the original data.

8. The organic light emitting display device of claim 7, wherein the encoding circuit and the decoding circuit each include a plurality of logic gates, and the logic gates include an exclusive-OR (XOR) gate implementing XOR.

9. The organic light emitting display device of claim 8, wherein the encoding circuit XORs first original data and second original data through the XOR gate and outputs first encoding data having a value different from each of the first original data and the second original data, and outputs any one of the first original data and the second original data, as second encoding data.

10. The organic light emitting display device of claim 6, wherein the transmission data of the Nth frame, the reception data of (N−

1)th frame and the modulated digital video data are implemented with the same bits.

11. A memory protection method for protecting information stored in a memory, the memory protection method comprising:

processing transmission data including state information of a display panel to generate original data in compliance with a transmission interface standard;

modulating a portion of the original data so as to be different from an original value to generate encoding data;

writing the encoding data into the memory according to the transmission interface standard;

inversely modulating encoding data read out from the memory to generate decoding data which is the same as the original data;

processing the decoding data to generate reception data which is the same as the transmission data; and

calculating a difference value between transmission data of an Nth (N is a positive integer) frame and reception data of an (N−

1)th frame and modulating an input digital video data on the basis of a compensation value in accordance with the difference value, and generating a modulated digital video data to be input to the display panel

wherein the transmission data of the Nth frame and the reception data of (N−

1)th frame are sensing data obtained from the display panel, and

wherein the input digital video data and the modulated digital video data have the same bits.

12. The memory protection method of claim 11, wherein a portion of the encoding data is different from the original data, and the remainder, excluding the portion, of the encoding data is the same as the original data.

13. The memory protection method of claim 12, wherein, in the generating of the encoding data and in the generating of the decoding data, exclusive-OR (XORing) is performed through an XOR gate.

14. The memory protection method of claim 13, wherein the generating of the encoding data comprises:

XORing first original data and second original data through the XOR gate and outputting first encoding data having a value different from each of the first original data and the second original data; and

outputting any one of the first original data and the second original data, as second encoding data.

15. The memory protection method of claim 11, wherein the transmission data of the Nth frame, the reception data of (N−

1)th frame and the modulated digital video data are implemented with the same bits.