CN101377919A - Gamma correction device - Google Patents

Abstract

The invention discloses a Gamma calibrating device, which comprises a loading control unit, a read only memory (ROM), a static random access memory (SRAM), a check code unit and a counting unit. The read only memory is used for storing multiple batches of Gamma data and a batch of check code. The static random access memory is coupled with the read only memory and used for data storing. The loading control unit is used for controlling a loading action that loads the multiple batches of Gamma data from the read only memory into the static random access memory. The check code unit is used for receiving the check code and determining whether the multiple batches of Gamma data in the static random access memory have errors according to the check code. The counting unit is used for summing up the times of errors that are detected by the check code unit. When the check code unit detects errors, the loading control unit reloads the multiple batches of Gamma data from the read only memory into the static random access memory.

Description

Gamma correcting device

Technical field

The present invention relates to a kind of gamma correction (Gamma Correction) device, and particularly relate to a kind of static discharge (Electrostatic Discharge, ESD) gamma correcting device of effect and memory process defective of preventing.

Background technology

In the epoch now that development in science and technology is maked rapid progress, gamma correction (Gamma Correction) has been widely used in image and has shown occasion, makes the display effect of image more can meet the visual psychology perceptibility of human eye.Be by predetermined gamma curve, for example when desire is carried out gamma correction to original image:

$\mathrm{gray}\_\mathrm{out}=\mathrm{gray}\_\max \×{\left(\frac{\mathrm{gray}\_\mathrm{in}}{\mathrm{gray}\_\max }\right)}^{\mathrm{\γ}}$ Come the corresponding output GTG value gray_out of generation that videos according to gamma numerical value γ, input GTG value gray_in and high gray value gray_max.

In the prior art, be that gamma correction curve is stored in the mode of question blank (Look-up Table), be to load question blank to storer, when gammate is desired to carry out gamma correction to carry out gamma correction.Yet because of the interference in the external world, (Electrostatic Discharge, ESD) influence produces mistake to the lookup table data in the storer, and then makes the gamma correction deleterious, even produces mistake as the static discharge effect easily.

Summary of the invention

The invention provides a kind of gamma correction (Gamma Correction) device, it can improve traditional gamma correcting device effectively and be subjected to static discharge effect (Electrostatic Discharge easily, ESD) influence and gamma correction result are easy to generate wrong shortcoming, and the operation that can avoid gamma correcting device in fact effectively is subjected to the static discharge effects and stop its operation when gamma correcting device produces permanent damage, to promote the advantage of its gamma correction correctness.

Propose a kind of gamma correcting device according to the present invention, comprising: Loading Control unit, ROM (read-only memory) (Read Only Memory, ROM), static memory (Static Random Access Memory, SRAM), check code unit and counting unit.ROM (read-only memory) is in order to store many gamma data and a check code; Static memory couples this ROM (read-only memory), in order to the storage data; The Loading Control unit is loaded on the described gamma data in this ROM (read-only memory) in order to control the loading action of this static memory; The check code unit is in order to reception and whether wrong to judge the described gamma data in this static memory according to this check code; Counting unit is in order to add up the number of times that this check code unit inspection makes mistake; Wherein, when this check code unit inspection made mistake, this Loading Control unit was loaded on described gamma data in this static memory in this ROM (read-only memory) again.

For foregoing of the present invention can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.

Description of drawings

Fig. 1 shows the calcspar of gamma correction (Gamma Correction) device according to the embodiment of the invention.

Fig. 2 shows the synoptic diagram of the check code unit 18 of Fig. 1.

The reference numeral explanation

10: gamma correcting device

12: the Loading Control unit

14: ROM (read-only memory)

16: static memory

18: the check code unit

20: counting unit

22: logical block.

Embodiment

Please refer to Fig. 1, it shows the calcspar of gamma correction (Gamma Correction) device according to the embodiment of the invention.Gamma correcting device 10 is applied to display system, in order to input GTG value (not shown) is carried out gamma correction, makes display system can have preferable display effect.Gamma correcting device 10 comprises Loading Control unit 12, ROM (read-only memory) 14, static memory 16, check code unit 18 and counting unit 20.Loading Control unit 12 provides address signal Sad and write signal Swr to ROM (read-only memory) 14 and static memory 16 respectively, the gamma data in the ROM (read-only memory) 14 is loaded on the loading action of static memory in order to control.

ROM (read-only memory) 14 is in order to storing many gamma data Sda and check code Sch, and provides gamma data Sda and this check code Sch that is stored in corresponding address according to address signal Sad.Static memory 16 receives and stores gamma data Sda according to write signal Swr, and stores gamma data Sda in static memory 16 in the corresponding address according to address signal Sad.

Gamma data Sda for example in fact in order to express a corresponding gamma curve, imports GTG value (not shown) to corresponding gamma data Sda and with its output in order to reflection.When gamma data Sda loaded, static memory 16 can be videoed input GTG value to corresponding gamma data, to carry out corresponding gamma correction.

Check code unit 18 is in order to receive and to come computing to obtain computing numerical value (not shown) according to the gamma data Sda that is stored in the static memory 16.Whether the gamma data Sda that the check code unit more receives and relatively whether this check code Sch and computing numerical value equate to judge storage in the gamma memory 16 is correct.Wherein, check code unit 18 for example is that (its synoptic diagram as shown in Figure 2 for Cyclic Redundancy Check, CRC) check code unit for traditional Cyclical Redundancy Check sign indicating number.In this embodiment, when the computing numerical value that calculates when check code unit 18 equals this check code Sch, represent that promptly this gamma data Sda does not have mistake, when being not equal to this check code Sch, represent that promptly this gamma data has mistake as if this computing numerical value.Counting unit 20 repeats to load frequency n in order to number of times or the calculating that accumulative total check code unit 18 continuous reviews make mistake, and adds up when check code Sch and computing numerical value are unequal and repeat to be written into frequency n=n+1, and n is the integer more than or equal to 0.Wherein, when check code unit 18 judges that the gamma data of static memory 16 is correct, the aggregate-value of replacement counting unit, the aggregate-value that meaning is about to this counting unit accumulative total makes zero.

Loading Control unit 12 more is used for again the gamma data in the ROM (read-only memory) 14 being loaded in the static memory 16 when check code unit 18 judges that this gamma data has mistake.So, the gamma correcting device 10 of present embodiment can automatically re-execute load operation when the gamma data Sda that static memory 16 loads is wrong.So, the gamma correcting device 10 of present embodiment can avoid the operation of gamma correcting device to be subjected to the interference in the accidental external world effectively, and (ElectrostaticDischarge ESD) influences, and makes gamma correction produce mistake as the static discharge effect.

Check code unit 18 for example produces when finishing audit by comparison sign indicating number Sch with operation that whether computing numerical value equates and finishes signal Sfi, and when check code Sch equates with computing numerical value generation output signal Sou.Counting unit 20 for example judges in response to finishing signal Sfi and output signal Sou whether check code Sch equates with computing numerical value.When receiving, counting unit 20 represents that check code Sch and computing numerical value are for equating when finishing signal Sfi and output signal Sou.

When counting unit 20 receive finish signal Sfi but represent check code Sch when not detecting output signal Sou and computing numerical value unequal, that is be that gamma data Sda in the static memory 16 is a mistake, counting unit 20 added up and repeated to load frequency n=n+1 this moment.

When repeating of calculating of counting unit 20 loads frequency n accumulative total when surpassing a default value, counting unit 20 produces termination signal Stm and closes Loading Control unit 12, static memory 16 and check code unit 18.So, to close gamma correcting device 10 to stop its gamma correction operation, wherein, this default value is the natural number greater than 1.

When repeating to load number of times above default value, expression gamma correcting device 10 produces in fact permanently and damages, for example static memory 16 has processing procedure defective (Process Defect) or produces damage in the long-time storage unit (Cell) of back static memory 16 of using, and causes gamma data Sda wherein to be mistake constantly.At this moment, the gamma correcting device 10 of present embodiment stops its gamma correction operation by termination signal Stm.So, the gamma correcting device 10 of present embodiment more can be effectively therein hardware stop its gamma correction effectively when producing permanent damage, to avoid influencing the display effect of display system.

Loading Control unit 12 can judge whether check code Sch equates with computing numerical value according to output signal Sou, and provides address signal Sad and write signal Swr to drive the gamma data Sda that static memory 16 loads in the ROM (read-only memory) 14 when it is unequal.

In one embodiment, Loading Control unit 12 comprises a logical block (not shown), in order to provide address signal Sad and write signal Swr to drive the gamma data Sda that static memory 16 loads in the ROM (read-only memory) 14 when the incident that receives a reset signal Sre or the incident that do not detect output signal Sou take place.The logical block of present embodiment for example is rejection gate (NOR), it is in order to judge respectively that in response to the low level of reset signal Sre and output signal Sou its corresponding incident is for triggering, and when the Event triggered of arbitrary correspondence, again the gamma data in the ROM (read-only memory) 14 is loaded in the static memory 16.

The gamma correcting device 10 of present embodiment more comprises logical block 22, in order to receive and to provide check code Sch that ROM (read-only memory) 14 provides in response to address signal Sad to check code unit 18.

The gamma correcting device of present embodiment comes the operational data and the check code of comparison gamma data by the check code unit, and being inequality at the comparative result that obtains, time control gamma correcting device reloads gamma data to static memory.So, the gamma correcting device of present embodiment can improve traditional gamma correcting device effectively and be subjected to static discharge effects and gamma correction result easily and be easy to generate wrong shortcoming, and has the advantage that the operation that can avoid gamma correcting device effectively is subjected to static discharge effects and gamma correction correctness thereof in fact.

In addition, the gamma correcting device of present embodiment more judges by counting unit whether the gamma data in the static memory repeatedly occurs loading error continuously, and judges that when the wrong continuously pre-determined number of the gamma data in the static memory gamma correcting device corrupted takes place permanently to close the gamma correction system.So, the gamma correcting device of present embodiment has more the advantage that the corrupted that can judge and avoid gamma correcting device effectively influences its gamma correction correctness.

In sum, though the present invention discloses as above with a preferred embodiment, so it is not in order to limit the present invention.The persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is as the criterion when looking the claim person of defining of the present invention.

Claims (8)

1. gamma correcting device comprises:

One ROM (read-only memory) is in order to store many gamma data and a check code;

One static memory couples this ROM (read-only memory), in order to the storage data;

One Loading Control unit is loaded on the described gamma data in this ROM (read-only memory) in order to control the loading action of this static memory;

One check code unit is in order to reception and whether wrong to judge the described gamma data in this static memory according to this check code; And

One counting unit is in order to add up the number of times that this check code unit inspection makes mistake;

Wherein, when this check code unit inspection made mistake, this Loading Control unit was loaded on described gamma data in this static memory from this ROM (read-only memory) again.

2. gamma correcting device as claimed in claim 1, wherein, this check code unit with the described gamma data computing in this static memory to obtain a computing numerical value, again by relatively this check code and this computing numerical value to judge whether described gamma data wrong.

3. gamma correcting device as claimed in claim 2, wherein, signal is finished in order to produce one when finishing this check code relatively with operation that whether this computing numerical value equates in this check code unit, and this check code unit more when being correct at comparative result, produces an output signal.

4. gamma correcting device as claimed in claim 3, wherein, this counting unit finishes signal by this and this output signal is calculated the number of times that this check code unit inspection makes mistake.

5. gamma correcting device as claimed in claim 1, wherein, the aggregate-value of checking the number of times that makes mistake when this computing unit accumulative total is during greater than a default value, and this gamma correcting device is with this Loading Control unit, this static memory and this check code unit forbidden energy.

6. gamma correcting device as claimed in claim 1, wherein, when the described gamma data in this this static memory of check code unit judges was correct, the aggregate-value that this counting unit is added up made zero.

7. gamma correcting device as claimed in claim 1, wherein, this Loading Control unit is loaded on the described gamma data in this ROM (read-only memory) in this static memory by an address signal and a write signal.

8. gamma correcting device as claimed in claim 1 more comprises:

One logical block, in order to this check code that this ROM (read-only memory) is provided according to this address signal to this check code unit.

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