Gate Voltage Generator Compensation for Display Temperature Stability
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Solution Overview
Problem
Conventional display devices, such as LCDs and OLEDs, face challenges in maintaining accurate output voltage due to temperature changes, leading to inadequate driving of the display at low temperatures, as the temperature compensation circuits on printed circuit boards fail to accurately reflect temperature changes on the LCD panel.
Innovation Solution
A display device with a gate voltage generator that includes a DC converter connected to a sub-gate node, which measures and compares voltage differences to generate compensation voltages, ensuring a constant gate signal level despite temperature changes, using a switch unit and charge pump to adjust gate-on and gate-off voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature compensation circuit is placed on the PCB, then the output voltage can be adjusted according to temperature changes, but the compensation cannot accurately reflect the temperature changes on the LCD panel
Solution Approach 1:
The patent merges the temperature compensation function directly into the gate driver circuit by integrating a compensation capacitor connected to the sub-gate node. This allows the gate driver to directly sense and compensate for temperature effects on the LCD panel, eliminating the need for a separate PCB-based compensation circuit and ensuring accurate reflection of panel temperature changes.
Solution Approach 2:
The patent uses the sub-gate node voltage as an intermediary signal to indicate temperature effects. By monitoring the voltage at this node, which is directly affected by temperature changes in the LCD panel, the system can indirectly measure temperature and apply appropriate compensation without requiring direct temperature sensing on the panel.
2Productivity
If the output voltage is adjusted to compensate for low temperature, then the display can be driven at low temperatures, but the voltage level becomes unstable due to temperature variations
Solution Approach 1:
The patent implements a feedback mechanism where the voltage at the sub-gate node is continuously monitored and used to control a switch that adjusts the compensation voltage. When the sub-gate voltage exceeds a reference threshold, the switch activates to provide additional compensation, creating a closed-loop system that maintains stable gate drive voltage despite temperature variations.
Solution Approach 2:
The patent dynamically changes the compensation voltage parameter based on temperature conditions. By adjusting the voltage level applied to the compensation capacitor in response to sub-gate node voltage changes, the system adapts the drive characteristics to maintain stable operation across different temperature ranges.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables the display device to maintain a constant voltage level across temperature changes, ensuring stable operation and accurate image display by dynamically adjusting gate voltages based on measured voltage differences.
Implementation Method 1
an inductor connected between an input node and the output node
Implementation Method 2
a charge pump connected to the DC converter and generating a gate on voltage and a gate off voltage using the compensation voltage
Data Source
AI summary
A display device is provided. A display device comprising, a gate voltage generator outputting a gate-on voltage and a gate-off voltage, a clock generator receiving the gate-on voltage and the gate-off voltage and outputting a clock signal, a gate driver receiving the clock signal and outputting a gate signal, the gate driver including a plurality of stages which are connected to a plurality of gate lines respectively, and a pixel unit comprising a plurality of pixels which are turned on or turned off by the gate signal to display an image, wherein the gate voltage generator comprises, a direct current (DC) converter connected to a sub-gate node and receiving a sub-gate signal which is one of outputs of the plurality of stages gate driver and outputting a compensation voltage using the received sub-gate signal.