Tft-lcd dynamic gamma adjustment circuit
By designing a dynamic gamma adjustment circuit for TFT-LCD, and utilizing the combination of chip IC4, transistor Q11, and resistors R8 and R9, two gamma modes are provided, solving the problem that traditional TFT-LCDs are difficult to adapt to different image quality content and ambient light conditions, and achieving an improvement in the realism of image colors.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUIZHOU GAOSHENGDA OPTOELECTRONIC TECH CO LTD
- Filing Date
- 2025-05-22
- Publication Date
- 2026-06-12
AI Technical Summary
Traditional TFT-LCDs use a fixed gamma curve, which makes it difficult to adapt to different image quality and ambient light conditions, resulting in color distortion.
A dynamic gamma adjustment circuit for TFT-LCD was designed. By combining chip IC4 with transistor Q11 and resistors R8 and R9, two gamma modes are provided to adapt to different image quality content and ambient light conditions, thereby realizing dynamic gamma curve adjustment.
It improves the realism of colors in the picture, can adapt to different picture quality content and ambient lighting conditions, and enhances the display effect.
Smart Images
Figure CN224354975U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of liquid crystal display technology, and in particular to a dynamic gamma adjustment circuit for TFT-LCD. Background Technology
[0002] TFT-LCD is a type of thin-film transistor liquid crystal display, which is widely used in electronic devices such as smartphones, televisions, and tablets.
[0003] In related technologies, traditional TFT-LCDs typically use a fixed gamma curve, which makes it difficult to adapt to different image quality content and ambient light conditions, resulting in color distortion. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a TFT-LCD dynamic gamma adjustment circuit that can provide different gamma curves to adapt to different image quality content and ambient light conditions, making the image colors more realistic.
[0005] The objective of this utility model is achieved through the following technical solution:
[0006] The first aspect of this application provides a TFT-LCD dynamic gamma adjustment circuit, including: a chip IC4; a mode adjustment module including a resistor R8, a transistor Q11, a resistor R9, and an input signal terminal. The first end of the resistor R8 is electrically connected to the chip IC4, the second end of the resistor R8 is electrically connected to the transistor Q11, the first end of the resistor R9 is electrically connected to the transistor Q11, and the second end of the resistor R9 is electrically connected to the input signal terminal. The input signal terminal is used to electrically connect to a TCON logic board.
[0007] It also includes an output module, which includes several gamma output pins, each of which is respectively disposed on the chip IC4.
[0008] The output module also includes a resistor R99, the first end of which is electrically connected to the chip IC4, and the second end of which is grounded.
[0009] The output module also includes a resistor R102, a capacitor C113, a capacitor C114, a capacitor C115, and a capacitor C116. The first end of the resistor R102 is electrically connected to the chip IC4, and the second end of the resistor R102 is electrically connected to the first ends of the capacitors C113, C114, C115, and C116, respectively. The second ends of the capacitors C113, C114, C115, and C116 are all grounded.
[0010] It also includes a feedback module, which includes resistors R101 and R104. The first end of resistor R101 is electrically connected to the chip IC4, the second end of resistor R101 is grounded, and resistor R104 is electrically connected to the first end of resistor R101.
[0011] It also includes an input module, which includes capacitors C144, C110, C111, and C112. The first terminal of capacitor C144 is electrically connected to the first terminals of capacitors C110, C111, and C112, respectively. The first terminals of capacitors C110, C111, and C112 are electrically connected to the chip IC4, respectively. The second terminals of capacitors C110, C111, and C112 are grounded.
[0012] The input module also includes capacitors C88 and C90. The first end of capacitor C88 is electrically connected to the first end of capacitor C90, the first end of capacitor C90 is electrically connected to chip IC4, and the second ends of capacitor C88 and capacitor C90 are respectively grounded.
[0013] The input module also includes a resistor R81 and a capacitor C89. The resistor R81 is electrically connected to the first end of the capacitor C89, the second end of the capacitor C89 is grounded, and the first end of the capacitor C89 is also electrically connected to the chip IC4.
[0014] It also includes a communication module, which includes a first communication pin and a second communication pin, which are respectively disposed on the chip IC4.
[0015] It also includes a resistor R67, the first end of which is electrically connected to the chip IC4, and the second end of which is grounded.
[0016] Compared with the prior art, the present invention has at least the following advantages:
[0017] When the input signal terminal of the TCON logic board is high, transistor Q11 is turned on, and the pin of chip IC4 corresponding to transistor Q11 is directly grounded and pulled low, entering the first gamma mode. When the TCON logic board output is low, transistor Q11 is turned off, and the pin of chip IC4 corresponding to transistor Q11 is pulled high through pull-up resistor R8, entering the second gamma mode. Thus, this application can provide two gamma modes, each with a different gamma curve, adapting to different image quality content and ambient light conditions, resulting in more realistic image colors. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.
[0019] Figure 1 This is a functional block diagram of the TFT-LCD dynamic gamma adjustment circuit in one embodiment of the present invention;
[0020] Figure 2 This is a circuit diagram of a TFT-LCD dynamic gamma adjustment circuit in one embodiment of the present invention. Detailed Implementation
[0021] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.
[0022] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0023] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0024] Traditional TFT-LCDs typically use a fixed gamma curve, which makes it difficult to adapt to different image quality and ambient light conditions, resulting in color distortion.
[0025] To address the aforementioned issues, this application provides a TFT-LCD dynamic gamma adjustment circuit, which addresses the problem that traditional TFT-LCDs typically use a fixed gamma curve, making it difficult to adapt to different image quality content and ambient light conditions, thus resulting in color distortion.
[0026] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.
[0027] See Figure 1 and Figure 2 A TFT-LCD dynamic gamma adjustment circuit includes: a chip IC4 and a mode adjustment module 100. The mode adjustment module 100 includes a resistor R8, a transistor Q11, a resistor R9, and an input signal terminal. The first end of the resistor R8 is electrically connected to the chip IC4, the second end of the resistor R8 is electrically connected to the transistor Q11, the first end of the resistor R9 is electrically connected to the transistor Q11, and the second end of the resistor R9 is electrically connected to the input signal terminal, which is used to electrically connect to the TCON logic board.
[0028] It should be noted that when the input signal terminal of the TCON logic board is high, transistor Q11 is turned on, and the pin of chip IC4 corresponding to transistor Q11 is directly grounded and pulled low, entering the first gamma mode; when the TCON logic board output is low, transistor Q11 is turned off, and the pin of chip IC4 corresponding to transistor Q11 is pulled high through pull-up resistor R8, entering the second gamma mode. Thus, this application can provide two gamma modes, each corresponding to a different gamma curve, thereby adapting to different image quality content and ambient light conditions, making the image colors more realistic. The input signal terminal is... Figure 2 In the CONTROL chip, the pin that is electrically connected to transistor Q11 is the BANK pin.
[0029] It should also be noted that the IC4 chip can be model LP6299QVF / QFN-32, which generates gamma curves and VCOM voltages through a gamma buffer and a VCOM buffer, along with an internal digital-to-analog converter. Each channel of the gamma buffer is equipped with a 10-bit DAC to ensure high-precision output voltage, while the VCOM buffer is equipped with a 7-bit digital-to-analog converter. The output range of the digital-to-analog converter is determined by the reference voltage VREF, which is obtained by dividing AVDD through resistors R60 and R66 in series and then filtering it through capacitor C75. The gamma buffer receives external digital signals via I2C, and these signals contain the configuration parameters for the gamma curve. The 10-bit digital-to-analog converter in each channel converts the digital signals into analog voltages, providing stable voltage signals to the output pins 1-7 and 18-24 for each channel. Similarly, the VCOM buffer receives external digital signals via I2C, and these signals contain the configuration parameters for the VCOM voltage. The 7-bit DAC converts the digital signals into analog voltages, which are then used by an internal operational amplifier to provide the output voltage to the output pin OPO.
[0030] See Figure 2 In one embodiment, a TFT-LCD dynamic gamma adjustment circuit further includes an input module 200. The input module 200 includes capacitors C144, C110, C111, and C112. The first terminal of capacitor C144 is electrically connected to the first terminals of capacitors C110, C111, and C112, respectively. The first terminals of capacitors C110, C111, and C112 are electrically connected to chip IC4, respectively. The second terminals of capacitors C110, C111, and C112 are grounded. Specifically, the input module 200 also includes capacitors C88 and C90. The first terminal of capacitor C88 is electrically connected to the first terminal of capacitor C90, and the first terminal of capacitor C90 is electrically connected to chip IC4. The second terminals of capacitors C88 and C90 are grounded. Specifically, the input module 200 also includes a resistor R81 and a capacitor C89. The first end of the resistor R81 and the first end of the capacitor C89 are electrically connected, the second end of the capacitor C89 is grounded, and the first end of the capacitor C89 is also electrically connected to the chip IC4.
[0031] It should be noted that after the DVD3V3 input, filter capacitors C88 and C90 provide a stable digital signal input for chip IC4. After the AVDD input, external circuit capacitors C144, C110, C111, and C112 provide a stable analog signal input. The core function of these four grounded capacitors is to achieve full-band filtering through parallel connection of multiple capacitance values. Simultaneously, another AVDD input is connected to pin 8, with a 0Ω resistor R81 in series and a capacitor C89 in parallel to filter out high-frequency interference on the signal line. This prevents sampling errors or logic mis-triggers and also allows for easy disconnection of the signal line to measure the original input or inject calibration signals.
[0032] See Figure 2 In one embodiment, a TFT-LCD dynamic gamma adjustment circuit further includes an output module 300, which includes a plurality of gamma output pins, each of which is respectively disposed on a chip IC4. Specifically, the output module 300 further includes a resistor R99, the first end of which is electrically connected to the chip IC4, and the second end of which is grounded. Specifically, the output module 300 further includes a resistor R102, capacitors C113, C114, C115, and C116, the first end of which is electrically connected to the chip IC4, and the second end of which is electrically connected to the first ends of capacitors C113, C114, C115, and C116, respectively. The second ends of capacitors C113, C114, C115, and C116 are all grounded.
[0033] It should be noted that the SET pin of chip IC4 is connected to an external resistor R99 to set the full-scale current of the gamma buffer, ensuring the accuracy of the gamma output voltage. Simultaneously, each output gamma pin is connected to an RC filter to reduce output ripple and improve gamma signal stability. Furthermore, the operational amplifier of the VCOM buffer outputs through the OPO pin, and is filtered by a series resistor R102 and four parallel capacitors C113, C114, C115, and C116 to ensure the stability of the output signal.
[0034] See Figure 2 In one embodiment, a TFT-LCD dynamic gamma adjustment circuit further includes a feedback module 400. The feedback module 400 includes a resistor R101 and a resistor R104. The first end of the resistor R101 is electrically connected to the chip IC4, the second end of the resistor R101 is grounded, and the first end of the resistor R104 is electrically connected to the first end of the resistor R101.
[0035] It should be noted that the OPP pin is obtained by voltage division of AVDD through resistors R104 and R101 in series, and serves as the non-inverting input of the operational amplifier. The OPN pin is connected to the OPO pin and serves as the inverting input of the operational amplifier. Together, they form an external feedback circuit to reduce external interference and further ensure the stability of the output signal.
[0036] See Figure 2 In one embodiment, a TFT-LCD dynamic gamma adjustment circuit further includes a communication module 500, which includes a first communication pin and a second communication pin, which are respectively disposed on the chip IC4.
[0037] It should be noted that the first communication pin is SDA, and the second communication pin is SCL. The SDA and SCL pins are connected to the external device and communicate with the external controller via the I2C communication protocol.
[0038] See Figure 2 In one embodiment, a TFT-LCD dynamic gamma adjustment circuit further includes a resistor R67, the first end of which is electrically connected to the chip IC4, and the second end of which is grounded.
[0039] It should be noted that the WP pin of chip IC4 is connected to ground via a 0-ohm resistor R67 to control the write protection function of the EEPROM.
[0040] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.
[0041] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.
Claims
1. A TFT-LCD dynamic gamma adjustment circuit, characterized in that, include: Chip IC4; The mode adjustment module includes a resistor R8, a transistor Q11, a resistor R9, and an input signal terminal. The first end of the resistor R8 is electrically connected to the chip IC4, the second end of the resistor R8 is electrically connected to the transistor Q11, the first end of the resistor R9 is electrically connected to the transistor Q11, and the second end of the resistor R9 is electrically connected to the input signal terminal. The input signal terminal is used to electrically connect to the TCON logic board.
2. The TFT-LCD dynamic gamma adjustment circuit according to claim 1, characterized in that, It also includes an output module, which includes several gamma output pins, each of which is respectively disposed on the chip IC4.
3. The TFT-LCD dynamic gamma adjustment circuit according to claim 2, characterized in that, The output module also includes a resistor R99, the first end of which is electrically connected to the chip IC4, and the second end of which is grounded.
4. The TFT-LCD dynamic gamma adjustment circuit according to claim 2, characterized in that, The output module also includes a resistor R102, a capacitor C113, a capacitor C114, a capacitor C115, and a capacitor C116. The first end of the resistor R102 is electrically connected to the chip IC4, and the second end of the resistor R102 is electrically connected to the first ends of the capacitors C113, C114, C115, and C116, respectively. The second ends of the capacitors C113, C114, C115, and C116 are all grounded.
5. The TFT-LCD dynamic gamma adjustment circuit according to claim 1, characterized in that, It also includes a feedback module, which includes resistors R101 and R104. The first end of resistor R101 is electrically connected to the chip IC4, the second end of resistor R101 is grounded, and resistor R104 is electrically connected to the first end of resistor R101.
6. The TFT-LCD dynamic gamma adjustment circuit according to claim 1, characterized in that, It also includes an input module, which includes capacitors C144, C110, C111, and C112. The first terminal of capacitor C144 is electrically connected to the first terminals of capacitors C110, C111, and C112, respectively. The first terminals of capacitors C110, C111, and C112 are electrically connected to the chip IC4, respectively. The second terminals of capacitors C110, C111, and C112 are grounded.
7. The TFT-LCD dynamic gamma adjustment circuit according to claim 6, characterized in that, The input module also includes capacitors C88 and C90. The first end of capacitor C88 is electrically connected to the first end of capacitor C90, the first end of capacitor C90 is electrically connected to chip IC4, and the second ends of capacitor C88 and capacitor C90 are respectively grounded.
8. The TFT-LCD dynamic gamma adjustment circuit according to claim 6, characterized in that, The input module also includes a resistor R81 and a capacitor C89. The resistor R81 is electrically connected to the first end of the capacitor C89, the second end of the capacitor C89 is grounded, and the first end of the capacitor C89 is also electrically connected to the chip IC4.
9. The TFT-LCD dynamic gamma adjustment circuit according to claim 1, characterized in that, It also includes a communication module, which includes a first communication pin and a second communication pin, which are respectively disposed on the chip IC4.
10. The TFT-LCD dynamic gamma adjustment circuit according to claim 1, characterized in that, It also includes a resistor R67, the first end of which is electrically connected to the chip IC4, and the second end of which is grounded.