CN206322461U - A kind of circuit of regulation gamma voltages - Google Patents

Abstract

The utility model discloses a circuit for adjusting gamma voltage, which comprises: a first version burning unit, a memory, a digital-to-analog conversion unit, a first judging unit, a voltage regulating unit, a second judging unit and a fixed version burning unit; The recording unit burns the first version of the gamma code into the memory, and the memory transmits the gamma voltage to the first judging unit through the digital-to-analog conversion unit; the judging unit of the first judging unit judges whether the gamma voltage is within the preset within the preset range, and transmit the adjustment signal generated by the judgment result to the voltage adjustment unit; the voltage adjustment unit adjusts the gamma voltage that is not within the preset range, and transmits the adjusted gamma voltage to the second judgment unit, the second judging unit judges whether the adjusted gamma voltage is within a preset range, and then transmits it to the finalized version burning unit after passing through; the finalized version burning unit burns the final gamma code into the In the memory, the gamma voltage adjustment is completed.

Description

A circuit for adjusting gamma voltage

technical field

The utility model relates to the field of display voltage adjustment, in particular to a circuit for adjusting gamma voltage.

Background technique

In the TET-LCD driving principle, the data driving circuit uses the gamma voltage as a reference to generate and realize gamma2.2 correction. P-Gamma IC is an integrated chip that generates various gamma voltages after digital-to-analog conversion by digital logic circuits.

The gamma correction circuit is mainly realized by the P-gamma IC, wherein the P-gamma IC includes an IIC protocol logic processing module, a memory module, a digital-to-analog conversion module and a voltage follower module. Among them, the IIC protocol logic processing module is a module for P-Gamma IC to adjust gamma voltage, and burn the adjusted code into P-Gamma IC.

However, due to the manufacturing accuracy of P-Gamma IC and the accuracy of setting resistance, the gamma voltage generated by the same version of the code corresponding to different PCBAs will have deviations. The problems caused by this deviation are: 1. The production test yield is reduced; 2. , affecting the correction effect of gamma voltage.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art, provide a circuit for adjusting the gamma voltage, improve the adjustment accuracy and improve the rate of good products.

The purpose of this utility model is achieved through the following technical solutions:

A circuit for adjusting gamma voltage, comprising: a first-version burning unit, a memory, a digital-to-analog conversion unit, a first judging unit, a voltage regulating unit, a second judging unit, and a fixed-version burning unit;

The first edition burning unit burns the first edition gamma code into the memory, and the memory transmits the gamma voltage to the first judging unit through the digital-to-analog conversion unit; the judging unit of the first judging unit judges the gamma Whether the voltage is within the preset range, and the judgment result generates an adjustment signal and transmits it to the voltage adjustment unit; the voltage adjustment unit adjusts the gamma voltage that is not within the preset range, and transmits the adjusted gamma voltage to the The second judging unit, the second judging unit judges whether the adjusted gamma voltage is within the preset range, and then transmits it to the fixed version burning unit after passing through; the final gamma code is burned by the fixed version burning unit recorded in the memory to complete the gamma voltage regulation.

As a further preferred solution, the memory and the digital-to-analog conversion unit are respectively connected to a signal processing unit, and through the signal processing unit, the original gamma code stored in the memory is output to a digital-to-analog converter for conversion to output a gamma voltage.

As a further preferred solution, the signal processing unit includes a signal processing chip and a filter circuit connected to the signal processing chip, the signal processing chip is connected to the memory, and the filter circuit is connected to the digital-to-analog conversion unit .

As a further preferred solution, the preset range of the first judging unit is a standard value ±15mV.

As a further preferred solution, the preset range of the second judging unit is a standard value ±15mV.

As a further preferred solution, the standard value of the gamma voltage is gamma2.2.

As a further preferred solution, the finalized version burning unit also burns a verification code into the memory.

Compared with the advantages and beneficial effects of the prior art, the utility model is as follows:

The utility model discloses a circuit for adjusting gamma voltage, which is provided with a first judging unit, which firstly checks whether the gamma voltage output after the initial version code is burnt to the circuit board is within the preset range, and the gamma voltage is not within the preset range. Voltage circuit boards, correct and adjust the gamma voltage in the voltage adjustment unit, after adjustment, then judge in the second judgment unit, after passing, all circuit boards meet the gamma voltage within the preset range, so that each circuit board The gamma voltages are all standard values or within the range of standard values, which eliminates the deviation caused by the first version of code programming and the accuracy of the resistors, thereby improving the yield rate of the circuit board and product consistency, ensuring that the circuit board Outputting standard gamma voltage makes the color performance of the display screen more realistic and the images displayed are lifelike.

Description of drawings

Fig. 1 is a functional block diagram of a circuit for adjusting gamma voltage in Embodiment 1.

detailed description

In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. Preferred embodiments of the utility model are provided in the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present utility model more thorough and comprehensive.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only and are not intended to represent the only embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of this invention. The terminology used herein in the description of the utility model is only for the purpose of describing specific implementations, and is not intended to limit the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example

The utility model discloses a circuit for adjusting the gamma voltage. The circuit automatically adjusts the gamma voltage of the circuit board through an IIC protocol logic processing module, so that the gamma voltage always falls within the range of the standard value and eliminates the problem caused by P-Gamma IC manufacturing precision. And the impact of insufficient resistance precision, the deviation of the gamma voltage caused by the circuit board.

Please refer to Fig. 1, the utility model provides a kind of circuit 10 of adjusting gamma voltage, comprising: the first version burning unit 100, memory 200, digital-to-analog conversion unit 300, first judging unit 400, voltage regulating unit 500, second judging unit 600 and the final version burning unit 700. The voltage adjustment unit 500 is specifically an IIC protocol logic processing module integrated in a P-gamma IC, and is used to adjust the gamma voltage.

The first edition burning unit 100 burns the first edition gamma code into the memory 200, and the memory 200 transmits the gamma voltage to the first judgment unit 400 through the digital-to-analog conversion unit 300; the first judgment The judgment unit 400 judges whether the gamma voltage is within a preset range, and generates an adjustment signal to the voltage adjustment unit 500 based on the judgment result; the voltage adjustment unit 500 adjusts the gamma voltage that is not within the preset range, and sends The adjusted gamma voltage is sent to the second judging unit 600, and the second judging unit 600 judges whether the adjusted gamma voltage is within a preset range, and then sends it to the finalized version burning unit 700; The finalized version burning unit 700 burns the final gamma code into the memory to complete gamma voltage regulation.

Specifically, between the voltage adjustment unit 500 and the second judgment unit 600, loop adjustment and loop judgment are performed, and the final gamma code is not burned into the memory 200 until the voltage adjustment unit 500 adjusts the gamma voltage to a preset range. middle.

It should be noted that the memory 200 and the digital-to-analog conversion unit 300 are respectively connected to the signal processing unit 800, and through the signal processing unit 800, the original gamma code stored in the memory 200 is output to the digital-to-analog converter 300 for further processing. Converts the output gamma voltage.

The signal processing unit 800 includes a signal processing chip 810 and a filter circuit 820 connected to the signal processing chip 810, the signal processing chip 810 is connected to the memory 200, the filter circuit 820 is connected to the digital-to-analog conversion unit 300 connections.

Preferably, the preset range of the first judging unit 400 is the standard value ±15mV. Preferably, the preset range of the second judging unit 600 is the standard value ±15mV. Only by ensuring that the gamma voltage is within the range of the standard value can the effect of the standard value of the gamma voltage be achieved.

Preferably, the standard value of the gamma voltage is gamma2.2. The finalized version burning unit 700 also burns the verification code into the memory 200 . The verification code is for the convenience of tracking in the future.

When the SMT circuit board is in the electrical test station, the first version of the code has been burned in the memory 200, and the electrical test equipment conducts a voltage test. Only when the gamma voltage is within the range of ±15mV of the standard value, the electrical test is completed, the circuit board can proceed to the next step. .

If the test gamma voltage is not within the standard value ±15mV range, the gamma voltage is adjusted by the voltage adjustment unit 500, and the gamma voltage is tested in real time until the gamma voltage is adjusted to the standard value ±15mV range, and the final gamma code is burned into the memory 200, and record the verification code of the code, which is convenient for tracking later. The whole debugging process is completed by the corresponding equipment, there will be no human error, and the working hours will be shorter.

After debugging, the gamma voltage of all circuit boards is within the standard value ±15mV range, and there will be no situation beyond the electrical measurement specification, thereby improving the yield rate; the gamma voltage offset is within 15mV, and will not cause damage to gamma2.2 Influence, to ensure the gamma correction effect.

In addition, the entire process of debugging and testing can also be carried out simultaneously with screen inspection, without additional sites and man-hours, and no additional man-hour costs.

The above-mentioned embodiments only express several embodiments of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the present utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (7)

1. A circuit for regulating gamma voltage, characterized in that, comprising: a first version burning unit, a memory, a digital-to-analog conversion unit, a first judging unit, a voltage regulating unit, a second judging unit and a finalized version burning unit; The first edition burning unit burns the first edition gamma code into the memory, and the memory transmits the gamma voltage to the first judging unit through the digital-to-analog conversion unit; the judging unit of the first judging unit judges the gamma Whether the voltage is within the preset range, and the judgment result generates an adjustment signal and transmits it to the voltage adjustment unit; the voltage adjustment unit adjusts the gamma voltage that is not within the preset range, and transmits the adjusted gamma voltage to the The second judging unit, the second judging unit judges whether the adjusted gamma voltage is within the preset range, and then transmits it to the fixed version burning unit after passing through; the final gamma code is burned by the fixed version burning unit recorded in the memory to complete the gamma voltage regulation. 2. The circuit for adjusting gamma voltage according to claim 1, characterized in that, the memory and the digital-to-analog conversion unit are respectively connected to the signal processing unit, and the first version of the gammacode stored in the memory is stored in the memory by the signal processing unit. Output to the digital-to-analog converter for conversion and output gamma voltage. 3. The circuit for adjusting gamma voltage according to claim 2, characterized in that, the signal processing unit comprises a signal processing chip and a filter circuit connected with the signal processing chip, and the signal processing chip is connected with the memory , the filter circuit is connected to the digital-to-analog conversion unit. 4. The circuit for adjusting gamma voltage according to claim 1, characterized in that, the preset range of the first judging unit is a standard value ±15mV. 5. The circuit for adjusting gamma voltage according to claim 1, characterized in that, the preset range of the second judging unit is a standard value ±15mV. 6. The circuit for adjusting gamma voltage according to claim 4 or 5, characterized in that, the standard value of the gamma voltage is gamma2.2. 7. The circuit for adjusting gamma voltage according to claim 1, characterized in that, the finalized version burning unit also burns a check code into the memory.