CN103137082B - Liquid crystal display device and its common pole voltage related data checking method - Google Patents

Abstract

A common electrode voltage related data checking method is suitable for a liquid crystal display device, the liquid crystal display device comprises a first storage unit and a second storage unit, and the method is characterized in that: the method comprises the following steps: reading a first optimal preset tuning voltage value stored in the first memory cell and a second optimal preset tuning voltage value stored in the second memory cell; and (B) obtaining a checked optimal preset tuning voltage value according to the first optimal preset tuning voltage value and the second optimal preset tuning voltage value.

Description

Liquid crystal display device and its common pole voltage related data checking method

technical field

The present invention relates to a liquid crystal display device, in particular to a liquid crystal display device and a method for checking data related to a common voltage (common voltage, Vcom) thereof.

Background technique

Please refer to FIG. 1 , a conventional liquid crystal display device 1 includes a panel driving device 11 , a liquid crystal panel 12 , and a control board 13 . The panel driving device 11 includes a pixel (pixel) driving module 111, and a common electrode adjustment module 112; the pixel driving module 111 is used to receive video signals, and is used to generate a source voltage and a gate voltage, the common The pole calibration module 112 is used to generate a common pole voltage (Vcom). The liquid crystal panel 12 is used for receiving the source voltage, the gate voltage, and the common voltage for displaying. The control board 13 includes a user data (user data) storage unit 131 for storing user data.

The common pole adjustment module 112 includes an electronically erasable programmable read only memory (electrically erasable programmable read only memory, EEPROM) 113, a digital to analog converter 114, and a common pole voltage generator (commonvoltage generator) 115 . The electronically erasable programmable read-only memory 113 is used for storing a preset adjustment voltage value in digital form; the digital-to-analog converter 114 is electrically connected to the electronically erasable programmable read-only memory 113, Used to receive the preset calibration voltage value and perform digital-to-analog conversion to obtain an analog voltage corresponding to the preset calibration voltage value; the common pole voltage generator 115 is electrically connected to the digital-to-analog converter 114 , for receiving the analog voltage, and performing a level shift according to the analog voltage to generate the common pole voltage.

Generally speaking, in order to improve the flicker phenomenon of the picture displayed by the liquid crystal display device 1, the liquid crystal display device 1 must be repeatedly adjusted and tested before leaving the factory to obtain the best preset adjustment voltage. value to be used to generate this common pole voltage. However, when the EEPROM 113 fails or is abnormal, the digital-to-analog converter 114 cannot correctly receive the preset calibration voltage value, so that the common voltage generator 115 generates An incorrect common voltage causes abnormal images displayed on the liquid crystal panel 12 .

Contents of the invention

The purpose of the present invention is to provide a method for checking data related to the common electrode voltage of a liquid crystal display device.

Another object of the present invention is to provide a liquid crystal display device.

The method for checking data related to the common pole voltage of the present invention is applicable to a liquid crystal display device, and the liquid crystal display device includes a first storage unit and a second storage unit; the method includes the following steps: (A) reading and storing in the first storage unit a first best preset tuning voltage value of a storage unit, and a second best default tuning voltage value stored in the second storage unit; and (B) according to the first best preset tuning voltage value; The calibration voltage value and the second best default calibration voltage value to obtain a checked best default calibration voltage value.

The step (B) of the common pole voltage-related data checking method of the present invention includes the following sub-steps: (b-1) judging whether the first best preset adjustment voltage value is equal to the second best preset adjustment voltage value; and (b-2) if the first best default calibration voltage value is not equal to the second best default calibration voltage value, according to the first best default calibration voltage value, the second maximum The optimal default adjustment voltage value and the average value of a default adjustment voltage value stored in the first storage unit are used to obtain the checked best default adjustment voltage value.

Step (B) of the common pole voltage related data check method of the present invention further includes a sub-step (b-3) after the sub-step (b-1): if the first optimal preset adjustment voltage value is equal to the second If the best default adjustment voltage value is selected, either the first best default adjustment voltage value or the second best default adjustment voltage value is used as the verified best default adjustment voltage value. calibration voltage value.

The sub-step (b-2) of the step (B) of the common pole voltage-related data checking method of the present invention includes the following sub-steps: (b-2-1) judging whether the second best preset adjustment voltage value is within a preset (b-2-2) If the second best preset adjustment voltage value is not within the preset range, then determine whether the first best preset adjustment voltage value is within the preset range and (b-2-3) if the first best preset adjustment voltage value is not within the preset range, then use the average value of the preset adjustment voltage values as the checked maximum The best preset tuning voltage value.

The sub-step (b-2) of the step (B) of the common pole voltage related data checking method of the present invention also includes a sub-step (b-2-4) after the sub-step (b-2-1): if the second If the best preset tuning voltage value is within the preset range, then the first best preset tuning voltage value is used as the checked best preset tuning voltage value.

The sub-step (b-2) of the step (B) of the common pole voltage related data checking method of the present invention also includes a sub-step (b-2-5) after the sub-step (b-2-2): if the first If the best preset tuning voltage value is within the preset range, then the first best preset tuning voltage value is used as the checked best preset tuning voltage value.

The step (B) of the common pole voltage-related data checking method of the present invention also includes a sub-step (b-4) after the sub-step (b-2): write the checked best preset adjustment voltage value into the the first storage unit to update the first best preset adjustment voltage value stored in it, and write the checked best preset adjustment voltage value into the second storage unit to update the stored best preset adjustment voltage value The second best preset calibration voltage value.

A liquid crystal display device provided by the present invention includes: a first storage unit, a panel driving device, and a liquid crystal panel; the panel driving device includes a pixel driving module, and a common electrode adjustment module, and the pixel driving module It is used to receive video signals, and is used to generate a source voltage and a gate voltage. The common pole adjustment module is used to generate a common pole voltage; the liquid crystal panel is used to receive the source voltage, the gate voltage, and The common pole voltage is displayed. The first storage unit stores a first optimal preset adjustment voltage value. The common pole adjustment module includes: a second storage unit, a common pole voltage-related data check unit, a digital-to-analog converter, and a common pole voltage generator. The second storage unit stores a second best preset adjustment voltage value; the common pole voltage related data checking unit is electrically connected to the first storage unit and the second storage unit, and is used to Setting the adjustment voltage value and the second best preset adjustment voltage value to obtain a checked best preset adjustment voltage value; the digital-to-analog converter is electrically connected to the common pole voltage-related data checking unit , for receiving the checked best preset adjustment voltage value and performing digital-to-analog conversion to obtain an analog voltage corresponding to the checked best preset adjustment voltage value; the common pole voltage generator Electrically connected to the digital-to-analog converter for receiving the analog voltage and generating the common pole voltage according to the analog voltage.

The first storage unit of the liquid crystal display device of the present invention also stores an average value of a preset calibration voltage value, and the common pole voltage-related data check unit judges whether the first optimal preset calibration voltage value is equal to the second maximum The best preset adjustment voltage value, if the first best preset adjustment voltage value is not equal to the second best preset adjustment voltage value, then the common pole voltage related data verification unit according to the first best preset adjustment voltage value setting the average value of the adjusted voltage value, the second best preset adjusted voltage value, and a preset adjusted voltage value stored in the first storage unit to obtain the checked best preset adjusted value Voltage value.

In the liquid crystal display device of the present invention, when the first best preset adjustment voltage value is not equal to the second best preset adjustment voltage value, the common pole voltage related data checking unit will also check the best preset Write the adjusted voltage value into the first storage unit to update the first best preset adjusted voltage value stored in it, and write the checked best preset adjusted voltage value into the second storage unit unit to update the stored second best preset calibration voltage value.

The beneficial effect of the present invention is that: the first best preset adjustment voltage value and the second best preset adjustment voltage value are used to check both sides through the common pole voltage related data checking unit, and the obtained The checked best preset adjustment voltage value, so that when the second storage unit fails or is abnormal, there is still a mechanism for further checking and correction of the stored second best preset adjustment voltage value, thereby The probability of abnormal occurrence of the picture displayed on the liquid crystal panel is reduced.

Description of drawings

FIG. 1 is a block diagram illustrating a conventional liquid crystal display device;

Fig. 2 is a block diagram illustrating a preferred embodiment of the liquid crystal display device of the present invention;

FIG. 3 is a flowchart illustrating a preferred embodiment of the method for checking data related to the common pole voltage of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

Please refer to FIG. 2 , a preferred embodiment of the liquid crystal display device 2 of the present invention includes a panel driving device 3 , a liquid crystal panel 4 , and a control board 5 . The panel driving device 3 includes a pixel driving module 31 and a common pole adjusting module 32 . The pixel driving module 31 is used for receiving video signals, and is used for generating a source voltage and a gate voltage. The common pole adjustment module 32 is used to generate a common pole voltage (Vcom). The liquid crystal panel 4 is used for receiving the source voltage, the gate voltage, and the common voltage for displaying. The control board 5 includes a first storage unit 51 . Since the functions and detailed implementation methods of the pixel driving module 31 and the liquid crystal panel 4 are well known to those skilled in the art, they will not be repeated here.

The common pole adjustment module 32 includes a second storage unit 321, a common pole voltage-related data check unit 322, a digital-to-analog converter 323, and a common pole voltage generator 324; the common pole voltage-related data check unit 322 is electrically connected to the first storage unit 51 and the second storage unit 321, the digital-to-analog converter 323 is electrically connected to the common pole voltage related data checking unit 322, and the common pole voltage generator 324 is electrically connected to the digital to analog converter 323.

Before the liquid crystal display device 2 leaves the factory, it must be repeatedly adjusted and tested to obtain an optimal preset adjusted voltage value related to the common pole voltage; then, the optimal preset adjusted voltage value will be respectively are written into the first storage unit 51 and the second storage unit 321. For the convenience of description, the best preset adjustment voltage value stored in the first storage unit 51 will be referred to as a first best preset adjustment voltage value below, and the preset adjustment voltage value stored in the second storage unit 321 will be referred to as a first best preset adjustment voltage value. The set adjustment voltage value is called a second best preset adjustment voltage value. Since the repeated adjustment and testing process of the liquid crystal display device 2 before leaving the factory is well known to those skilled in the art, it will not be repeated here.

After the liquid crystal display device 2 leaves the factory, when the liquid crystal display device 2 is powered on (power on), the common pole voltage-related data checking unit 322 according to the first optimal preset stored in the first storage unit 51 The calibration voltage value and the second best default calibration voltage value stored in the second storage unit 321 are checked to obtain a checked optimal default calibration voltage value. The digital-to-analog converter 323 receives the checked best preset adjustment voltage value, and performs digital-to-analog conversion to obtain an analog voltage corresponding to the checked best preset adjustment voltage value; the common The electrode voltage generator 324 receives the analog voltage, and generates the common electrode voltage by performing a level shift according to the analog voltage. Since the functions and detailed implementation methods of the digital-to-analog converter 323 and the common voltage generator 324 are well known to those skilled in the art, they will not be repeated here.

Preferably, in the process of repeated calibration and testing carried out before the liquid crystal display device 2 leaves the factory, an average value of a preset calibration voltage value can also be obtained, and the average value of the preset calibration voltage value will be written into In the first storage unit 51, the common pole voltage-related data checking unit 322 further uses the average value of the preset adjustment voltage value, and according to the first optimal preset adjustment voltage value, the second The best preset tuning voltage value to obtain the checked best preset tuning voltage value.

In this preferred embodiment, the first storage unit 51 is realized by using the user data storage unit 131 shown in FIG. In addition, there is another part of storage space for storing the first optimum preset adjustment voltage value and the average value of the preset adjustment voltage value; and the second storage unit 321 utilizes the Electronically Erasable Programmable Read-Only Memory 113. It is worth mentioning that the first storage unit 51 and the second storage unit 321 can also be other pre-planned storages for storing the above data (for example, various non-volatile storages (non-volatile memory)), and It is not limited to the disclosure of this preferred embodiment.

The steps performed by the common pole voltage related data checking unit 322 will be described below in conjunction with a preferred embodiment of the common pole voltage related data checking method of the present invention.

Please refer to FIG. 2 and FIG. 3 , when the liquid crystal display device 2 is powered on, the data verification unit 322 related to the common electrode voltage will then perform the following steps.

In step 601, the common pole voltage-related data verification unit 322 reads the first optimal preset adjustment voltage value stored in the first storage unit 51, and the second optimal preset voltage value stored in the second storage unit 321. Optimal preset tuning voltage value.

In step 602, the common pole voltage-related data checking unit 322 compares the first best preset tuning voltage value read in step 601 with the second best preset tuning voltage value, to determine whether the first best default tuning voltage value is equal to the second best default tuning voltage value; if the first best default tuning voltage value is "equal" to the second best default tuning voltage value calibration voltage value, proceed to step 603; otherwise, proceed to step 604; further, in this preferred embodiment, when the first optimal preset calibration voltage value is "not equal to" When the second optimal preset adjustment voltage value is reached, it is considered that the second storage unit 321 is invalid or abnormal.

In step 603, since the first optimum preset adjustment voltage value is “equal to” the second optimum preset adjustment voltage value, the common pole voltage related data check unit 322 uses the first optimum preset adjustment voltage value Any one of the adjusted voltage value and the second best preset adjusted voltage value is set as the checked best preset adjusted voltage value.

In step 604, the common pole voltage-related data check unit 322 judges whether the second best preset adjustment voltage value is within a preset range; if yes, proceed to step 605; otherwise, proceed to step 606 processing. In this preferred embodiment, the preset range is from "0" to "an upper limit value of the adjusted voltage value"; and the upper limit value of the adjusted voltage value is related to the original definition of the adjusted voltage value specification. The calibration voltage value is defined as 8-bit data, and the upper limit of the calibration voltage value is 2 ⁸ . Furthermore, step 604 is to judge whether the second best preset adjustment voltage value meets the conditional expression shown in the following equation (1):

0<the second best preset adjustment voltage value<the upper limit value of the adjustment voltage value......(1)

In step 605 , the checking unit 322 for the data related to the common pole voltage uses the first best default adjustment voltage value as the checked best default adjustment voltage value.

In step 606, the common pole voltage-related data check unit 322 judges whether the first optimal preset adjustment voltage value is within the preset range; if yes, proceed to step 605; otherwise, proceed to step 607 processing.

In step 607, the common pole voltage-related data verification unit 322 reads the average value of the preset calibration voltage values stored in the first storage unit 51, and takes the average value of the preset calibration voltage values as the Checked best preset trim voltage value.

In step 608, the common pole voltage related data checking unit 322 writes the checked best preset adjustment voltage value into the first storage unit 51, so as to update the stored first best preset adjustment voltage value. calibration voltage value; the common pole voltage-related data check unit 322 also writes the checked best preset calibration voltage value into the second storage unit 321, so as to update the stored second best preset calibration voltage value. calibration voltage value.

In step 609 , the checking unit 322 for the related data of the common pole voltage transmits the checked optimal preset adjustment voltage value to the digital-to-analog converter 323 for subsequent related processing.

To sum up, the present invention uses the first best preset adjustment voltage value and the second best preset adjustment voltage value to check both sides through the common pole voltage related data checking unit 322, and obtains the The checked best preset tuning voltage value, so that when the second storage unit 321 fails or is abnormal, there is still a mechanism for further checking and correcting the stored second best preset tuning voltage value , thereby reducing the probability of abnormal occurrence of the picture displayed by the liquid crystal panel 4, so the purpose of the present invention can indeed be achieved.

The above is only a preferred embodiment of the present invention, and the scope of the present invention can not be limited with this, that is, all the simple equivalent changes and modifications made according to the claims of the present invention and the content of the description of the invention are still within the scope of this invention. within the scope of invention patents.

Claims (7)

1. a common pole voltage relative data checking method, is applicable to a liquid crystal display, and this liquid crystal display comprises one first storage unit, and one second storage unit; It is characterized in that: the method comprises the following step:

(A) read the one first best default adjustment magnitude of voltage being stored in this first storage unit, and be stored in one second best default adjustment magnitude of voltage of this second storage unit; And

(B) according to this first best default adjustment magnitude of voltage and this second best default adjustment magnitude of voltage, adjustment magnitude of voltage is preset to obtain the best checked;

Step (B) comprises substep:

(b-1) judge whether this first best adjustment magnitude of voltage of presetting equals this second best default adjustment magnitude of voltage; And

(b-2) if this first best adjustment magnitude of voltage of presetting is not equal to this second best default adjustment magnitude of voltage, then according to this first best default adjustment magnitude of voltage, this second best default adjustment magnitude of voltage, and being stored in the mean value that one of this first storage unit presets adjustment magnitude of voltage, the best checked to obtain this presets adjustment magnitude of voltage;

Sub-step (b-2) comprises substep:

(b-2-1) judge that this second best presets adjustment magnitude of voltage whether within a preset range;

(b-2-2) if this second best adjustment magnitude of voltage of presetting is not within this preset range, then judge that this first bestly presets adjustment magnitude of voltage whether within this preset range; And

(b-2-3) if this first best adjustment magnitude of voltage of presetting is not within this preset range, then adjustment magnitude of voltage is preset using the mean value of this default adjustment magnitude of voltage as the best that this has been checked.

2. common pole voltage relative data checking method according to claim 1, it is characterized in that: step (B) also comprises the sub-step (b-3) after sub-step (b-1): if the default adjustment magnitude of voltage of this first the best equals this second best default adjustment magnitude of voltage, then wherein any one presets adjustment magnitude of voltage as the best that this has been checked to preset both adjustment magnitudes of voltage using this first best default adjustment magnitude of voltage and this second the best.

3. common pole voltage relative data checking method according to claim 1, it is characterized in that: sub-step (b-2) also comprises the sub-step (b-2-4) after sub-step (b-2-1): if this second best adjustment magnitude of voltage of presetting is within this preset range, then preset adjustment magnitude of voltage using this first best adjustment magnitude of voltage of presetting as the best that this has been checked.

4. common pole voltage relative data checking method according to claim 1, it is characterized in that: sub-step (b-2) also comprises the sub-step (b-2-5) after sub-step (b-2-2): if this first best adjustment magnitude of voltage of presetting is within this preset range, then preset adjustment magnitude of voltage using this first best adjustment magnitude of voltage of presetting as the best that this has been checked.

5. common pole voltage relative data checking method according to any one of claim 1 to 4, it is characterized in that: step (B) also comprises the sub-step (b-4) after sub-step (b-2): the best this checked is preset adjustment magnitude of voltage and write this first storage unit, to upgrade this first best default adjustment magnitude of voltage stored by it, and the best this checked is preset adjustment magnitude of voltage and write this second storage unit, second bestly preset adjustment magnitude of voltage with this upgrading stored by it.

6. a liquid crystal display, comprises: one first storage unit, a board driving mchanism, and a liquid crystal panel; This board driving mchanism comprises a pixel driver module, and has homopolarity adjustment module altogether, and this pixel driver module is for receiving video signal, and for generation of source voltage and a gate voltage, this common pole adjustment module is for generation of having same pole tension altogether; This liquid crystal panel is for receiving this source voltage, this gate voltage, and this common pole tension is to show; It is characterized in that:

This first storage unit stores one first best default adjustment magnitude of voltage;

This common pole adjustment module comprises:

One second storage unit, stores one second best default adjustment magnitude of voltage;

One common pole voltage relative data checks unit, be electrically connected on this first storage unit and this second storage unit, for according to this first best default adjustment magnitude of voltage and this second best default adjustment magnitude of voltage, preset adjustment magnitude of voltage to obtain the best checked;

One digital to analog converter, be electrically connected on this common pole voltage relative data and check unit, the best checked for receiving this presets adjustment magnitude of voltage, and carries out numeral to analog-converted to obtain being relevant to the analog voltage that this best checked presets adjustment magnitude of voltage; And

Homopolarity voltage generator, being electrically connected on this digital to analog converter, for receiving this analog voltage, and producing this common pole tension according to this analog voltage altogether;

This first storage unit stores the mean value that one presets adjustment magnitude of voltage, this common pole voltage relative data is checked this first best adjustment magnitude of voltage of presetting of unit judges and whether is equaled this second best default adjustment magnitude of voltage, if this first best adjustment magnitude of voltage of presetting is not equal to this second best default adjustment magnitude of voltage, this common pole voltage relative data checks unit judges, and this second best presets adjustment magnitude of voltage whether within a preset range, if this second best adjustment magnitude of voltage of presetting is not within this preset range, then judge that this first best presets adjustment magnitude of voltage whether within this preset range, if this first best adjustment magnitude of voltage of presetting is not within this preset range, then preset adjustment magnitude of voltage using the mean value of this default adjustment magnitude of voltage as the best that this has been checked.

7. liquid crystal display according to claim 6, it is characterized in that: when this first best default adjustment magnitude of voltage is not equal to this second best default adjustment magnitude of voltage, this common pole voltage relative data is checked unit and also the best that this has been checked is preset adjustment magnitude of voltage and write this first storage unit, to upgrade this first best default adjustment magnitude of voltage stored by it, and the best this checked is preset adjustment magnitude of voltage and write this second storage unit, second bestly preset adjustment magnitude of voltage with this upgrading stored by it.