Data Voltage Compensation Circuit for Display Panels
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Solution Overview
Problem
Changes in the load of a display panel due to environmental conditions can lead to fluctuations in power supply voltage, adversely affecting the performance and image quality of the display panel.
Innovation Solution
A data voltage compensation circuit that includes a compensation information provider to generate a test data voltage and provide compensation information, a gamma register to provide a gamma value, and a compensation data voltage provider to adjust the data voltage based on the compensation information and reference voltage, maintaining a constant difference between the power supply voltage and data voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the load of the display panel increases, then the power supply voltage decreases, but the image quality deteriorates
Solution Approach 1:
The patent changes the parameter of data voltage dynamically based on the power supply voltage level. When the power supply voltage decreases due to increased load, the compensation circuit adjusts the data voltage accordingly to maintain a constant difference between them, thereby preserving image quality under varying power conditions
Solution Approach 2:
The patent implements a feedback mechanism where the compensation circuit continuously monitors the power supply voltage and adjusts the data voltage in response. The gamma register and compensation circuit form a closed-loop system that detects power supply variations and applies corrective voltage adjustments to maintain consistent display performance
2Reliability
If the power supply voltage changes due to environmental conditions, then the display performance is affected, but adding compensation circuitry increases device complexity
Solution Approach 1:
The compensation circuit is designed to perform multiple functions: it monitors power supply voltage, calculates compensation values, stores gamma data, and outputs compensated video signals. By integrating these functions into a single circuit block, the patent reduces overall device complexity while maintaining display performance
Solution Approach 2:
The patent introduces a gamma register as an intermediary component that stores pre-calculated gamma data. This intermediary element simplifies the compensation process by providing lookup tables or stored values that represent the relationship between power supply voltage and required data voltage adjustments, reducing the computational complexity of real-time compensation
Data Source
AI summary
A data voltage compensation circuit includes a compensation information provider, a gamma register, and a compensation data voltage provider. The compensation information provider generates a test data voltage based on a test power supply voltage and a test reference voltage, and provides compensation information corresponding to the test data voltage. The gamma register provides a gamma value corresponding to display data. The compensation data voltage provider provides a compensation data voltage based on the gamma value, the compensation information, and a reference voltage. Changes in the reference voltage change a power supply voltage of a display panel.